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31 results about "Sediment particle size" patented technology

Particle Sizes. Sediment particles are classified as gravel if they're larger than 2 millimeters, and if they're between 1/16th and 2 mm, silt if they're between 1/16th and 1/256th mm, and clay if they're even smaller.

City river course environment improving method

The present invention discloses a city river course environment improving method, which comprises: water level maintaining, wherein the city river course is maintained at a certain range; water quality improving, wherein a flocculant and / or oxidizing agent is used for the water body so as to make the suspension of the water body be subjected to coagulation, and then settlement is performed to improve the transparency of the water body; sediment improving, wherein the sediment particle size is refined, the sediment oxidation reduction conditions are improved, and the sediment harmful organisms are killed; upstream floating residue trapping removing, wherein the grilling for removing the floating substances on the water surface is arranged on the river course upstream; and ecological revetment protection, wherein ecological hexagonal bricks or / and wetland plants and / or vine plants are used to protect the revetment so as to enhance the side slope stability. According to the present invention, the river course water quality is improved, the sense organ requirements of human on the river course are met, and the river course organism species diversity is enriched.
Owner:绵阳市靓固建设工程有限公司

Sediment particle size spectrum analysis method and device

The invention provides a sediment particle size spectrum analysis method and device. The sediment particle size spectrum analysis method includes the steps that sediment samples are acquired; the particle size distribution of the sediment samples is obtained through a laser scattering particle size distribution analyzer, and the particle size of the sediment samples is determined according to the set size range; spectrum transition of the sediment samples at the set wavelength position is eliminated, the reflectance spectrum of the sediment samples is generated and reprocessed, and three derived spectrum indexes of a reflectance first-order derivative, a logarithm of a reflectance reciprocal and reflectance absorption depth are generated; the relevance between the particle size of the sediment samples, the reflectance within the set wavelength range, the reflectance first-order derivative, the logarithm of the reflectance reciprocal and the reflectance absorption depth is calculated through a relevance analyzing method, and the optimal spectrum indexes and wavelengths participating in modeling are determined; through a partial least squares method, a regression model between the particle size of sediment and the optimal spectrum indexes is established.
Owner:PETROCHINA CO LTD

Pump station approach channel and forebay sand-containing moving bed surface flow velocity distribution determination method and device

ActiveCN111259606AImproved ability to predict flow ratesAccurate captureDesign optimisation/simulationSediment particle sizeHydrology
The embodiment of the invention provides a pump station approach channel and forebay sand-containing moving bed surface flow velocity distribution determination method and device, and the method comprises: obtaining a reciprocating flow outer boundary layer flow velocity, a flow period, a sediment particle size, a ratio of sediment to water density through measurement, and obtaining a sand-containing moving bed surface friction factor, a Sierz number and a sediment sedimentation velocity; and further obtaining a phase difference and a phase lead of the flow velocity section of the sand-containing moving bed surface. Related phase difference and phase lead are determined, the influence of phase difference on flow velocity distribution is reflected, phase residue and phase drift of relativeflow velocity of the reference surface position of flow velocity distribution in the reciprocating flow process are reflected, asymmetry of flow velocity distribution of the moving bed surface in theflow acceleration and deceleration stages is reflected, the flow velocity prediction capacity of a high-sand-content area near the moving bed surface is improved, and the upper bound of the flow velocity is accurately captured.
Owner:CHINA AGRI UNIV

Sediment recognition method and sediment recognition system based on image fusion

Disclosed are a sediment recognition method and a sediment recognition system based on image fusion. The sediment recognition system is a novel digital recognition system for sediment particle size and proportion. Natural sediment is recognized completely by information processing and artificial intelligence decision technology. The sediment recognition method includes: shooting to-be-recognized sediment, and processing according to the shot pictures. The sediment recognition method and the sediment recognition system are modified. The sediment recognition system comprises a multi-dimensional image data acquisition part, a multi-dimensional image data fusion part and a sediment particle size and proportion recognition and intelligent decision part. Sediment particle size and proportion are recognized on the basis of image fusion due to three-dimensional inherent attribute, multi-dimensionality and irregularity of sediment and according to image processing technology, especially technology for making two-dimensional images three-dimensional.
Owner:JIANGSU ZHENGYUAN INFORMATION TECH

Method for quickly predicting local scouring depth of ocean pile

ActiveCN111291470ADetermining local scour depthRapid prediction of local scour depthDesign optimisation/simulationSoil scienceSediment particle size
The invention provides a method for quickly predicting the local scouring depth of an ocean pile. The method comprises the steps that firstly, parameters of fluid, sediment and a pile foundation are determined, wherein the parameters include the ocean current flow speed, the seawater depth, the sediment particle size and the pile foundation diameter; then dimensionless parameters influencing the local scouring depth of the seabed around the pile are obtained; the processed dimensionless parameters are substituted into a calculation formula of the local scouring depth of the seabed around the pile to obtain the local scouring depth of the seabed around the pile; and then the local scouring depth of the adjacent pile foundation is predicted through the scouring depth of the pile foundation in combination with the distance between the two pile foundations and the incoming flow included angle. According to the method, the local scouring depth of the pile foundation in the marine environment can be simply and conveniently predicted, the local scouring depth of the downstream pile foundation can be rapidly predicted according to the scouring depth of the upstream pile foundation, the method can be better applied to engineering design, and the working efficiency is improved.
Owner:SHANGHAI JIAO TONG UNIV

Method for calculating form of sediment accumulation body during bottom throwing of trailing suction hopper dredger

The invention discloses a method for calculating the form of a sediment accumulation body during bottom throwing of a trailing suction hopper dredger. The method comprises the following steps: (1) collecting data of the trailing suction hopper dredger under the bottom throwing operation mode condition; (2) establishing a sand throwing shape function according to the sand throwing amount and the sand throwing point water depth; (3) establishing a particle size coefficient function according to the water depth of the sand throwing point and the sediment particle size; and (4) fitting the sand throwing shape function, the particle size coefficient function and the established physical model to obtain a stacking body shape function. According to the method, a physical model is established through collected historical data of the trailing suction hopper dredger under the condition of a bottom throwing operation mode; summarizing and fitting the morphological relation of the underwater sediment accumulation body under the condition of the bottom throwing operation mode of the dredger, quickly calculating the morphology of the underwater sediment accumulation body according to the sediment throwing amount, the sediment throwing depth and the sediment particle size of the bottom throwing operation of the dredger, and guiding and optimizing the operation mode of the dredger.
Owner:CHEC DREDGING +1

Mechanical property detection and data processing method for hydrate-containing sediments

The invention discloses a mechanical property detection and data processing method for hydrate-containing sediments, and the method comprises the following steps: installing a to-be-detected sample, and applying a simulation environment; adjusting the three-axis loading acoustic emission signal detection device to perform zero calibration; setting amplifier gain and the logic sequence of on-off ofswitches in the multi-channel signal switching module on the control host, configuring parameters of the data acquisition module, and turning on a parameter acquisition analyzer, an acoustic emissionsource locator and a crack imager; obtaining and processing static detection data, and obtaining and processing dynamic detection data; changing the particle size of sediments in the sample and the content of added clay, and repeatedly obtaining static and dynamic detection data; measuring the pore pressure and temperature of the sample in real time, calculating the hydrate content in the samplebased on the amount of consumed methane gas, and performing further calculating to obtain the hydrate saturation. According to the invention, the defect change trend can be dynamically reflected without additional energy; the fracture time point of the sample in the triaxial loading process can be accurately identified; and the method achieves the accurate positioning of defect locations.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA) +1

Determination method and device for unit-width sediment discharge of approach channel and forebay of pumping station

The embodiment of the invention provides a determination method and device for the unit-width sediment discharge of an approach channel and a forebay of a pumping station. The method comprises the steps that the outer boundary layer flow speed, the flow period, the sediment particle size, the ratio of sediment to water density, and the water kinematic viscosity coefficient of water bodies of the approach channel and the forebay of the pumping station are obtained; the Shields number and the friction factor of a reciprocating flow sediment-containing movable bed surface are obtained; and on thebasis of all the parameters, boundary layer asymmetry analysis of the movable bed surface is carried out, and the erosion depth and the boundary layer thickness are obtained, so that the instantaneous unit-width sediment discharge of a volume meter under the reciprocating flow condition is obtained. According to the embodiment, design calculation is carried out through the determined related boundary layer thickness of the movable bed surface and determined phase difference parameters, the phase residual of the sediment discharge after the flow velocity is reduced and the phase drift of the relative flow velocity are reflected, the relation between the instantaneous sediment discharge and the flow velocity times is given, and negative net sediment transport generated by the large phase difference effect in asymmetric flow is judged.
Owner:CHINA AGRI UNIV

Eutrophic tidal flat sediment habitat repair information processing system and method

The invention belongs to the technical field of information processing and discloses a eutrophic tidal flat sediment habitat repair information processing system and method. The eutrophic tidal flat sediment habitat repair information processing system comprises a sediment component detection module, a pollutant detection module, a sediment particle size detection module, a central control module,a particle size data processing module, a sampling module, a screening module, a heating and dissolution module, a repair module and a display module. According to the method, the pollutant detectionmodule is adopted to perform detection, so that the system has the advantages of high detection and analysis speed, high sensitivity and wide detection range, can comprehensively detect organic pollutants and avoid leakage detection phenomena, is convenient to operate, and can assist in shortening detection time, reducing detection cost and effectively improving the capability of detecting organic pollutants in sediments; and with the particle size data processing module adopted, the particle size parameter calculation and the naming of the sediments can be more normative, processing operation is simpler, and results are more accurate.
Owner:HUNAN UNIV OF ARTS & SCI

Method and device for determining total suspended sediment amount of pump station approach channel and forebay

InactiveCN111324934AReduce Phase Drift TimeAvoid underestimationDesign optimisation/simulationSoil scienceSediment particle size
The embodiment of the invention provides a method and device for determining the total suspended sediment amount of a pump station approach channel and a forebay. The method comprises the steps that the outer boundary layer flow velocity, the flow period, the sediment particle size and the ratio of sediment to water density of the pump station approach channel and a forebay water body are obtained; based on the maximum value of the flow velocity of the outer boundary layer, the flow period, the sediment particle size and the ratio of sediment to water density, the maximum Sierz number and thefriction factor of the sand-containing movable bed surface are obtained; according to the law of conservation of mass, the total suspended sediment amount on the sand-containing movable bed surface and the proportion of the total suspended sediment amount to the total sediment amount above the initial bed surface are obtained. According to the method, mass conservation is considered, design calculation is carried out through the determined related phase difference parameters, the time response of the total suspended sediment amount relative to water flow in the reciprocating flow process can be reflected, phase residues of the total suspended sediment amount and phase drift of the relative flow speed after the flow speed is reduced are reflected, and underestimation of the mean value of the total suspended sediment amount is avoided.
Owner:CHINA AGRI UNIV

Drainage basin sediment traceability simulation method based on CAESAR-Lisflood model

The invention discloses a drainage basin sediment traceability simulation method based on a CAESAR-Lisflood model. The method comprises the following steps: S1, determining a landslide instability slope angle threshold value of a drainage basin; S2, establishing a drainage basin landslide instability slope angle threshold spatial distribution file; S3, establishing a two-dimensional material source index matrix; S4, on the basis of a CAESAR-Lisflood model, establishing a four-dimensional array variable strata[xyindex; z; n, T] and a three-dimensional array variable grain[xyindex; n, T], wherein the xyindex represents a position index, z stores a stratum index, n stores a corresponding sediment particle size range index, T represents a tracking index value, the value range is 1-m, and m is a natural number greater than 1; and S5, utilizing the CAESAR-Lisflood model to simulate and trace the migration process of substances in different substance source areas.
Owner:谢军

Sediment dynamic particle size calculation method considering different sediment sources for distributed water-sediment model

The invention discloses a sediment dynamic particle size calculation method considering different sediment sources for a distributed water-sediment model, and the method comprises the steps: in the distributed water-sediment model with a slope, a channel and a riverway, according to the different sediment sources in a sediment production and transportation process, performing weighted average calculation of the comprehensive particle size of the sediment through the number of the sediment particles from each source, and finally obtaining the sediment production and transportation capacity of the slope, the channel and the riverway link of the target drainage basin under the simulation of the distributed water-sediment model. The method has the advantages that dynamic change calculation ofthe sediment particle size is achieved by considering the sediment source, the method is suitable for basin distributed water and sediment models of various scales, the sediment particle size of the model can achieve dynamic change on different space-time scales, then the depicting capacity of the model on reality is improved, and the simulation precision of the distributed water and sediment model is effectively improved.
Owner:CHINA INST OF WATER RESOURCES & HYDROPOWER RES

Sediment particle size wet screening machine

The invention provides a sediment particle size wet screening machine and relates to a screening machine. The sediment particle size wet screening machine is provided with a water supply pipe, a transparent anti-sputtering cover, a grading cleaning sieve, a filter liquid collecting device, a filter liquid collecting bottle, a motive power vibration device, a base and a control circuit, wherein a water outlet of the water supply pipe is connected with an inlet arranged at the upper end of the transparent anti-sputtering cover, the lower end of the transparent anti-sputtering cover is connected with the upper end of the grading cleaning sieve in a sealed way, the grading cleaning sieve is provided with at least two stages of cleaning sieves with different hole diameters, all stages of cleaning sieves are connected in series, the upper end of the filter liquid collecting device is connected with the lower end of the grading cleaning sieve in a sealed way, an outlet of the filter liquid collector is connected with an inlet of the filter liquid collecting bottle, the motive power vibration device is provided with a fixed bottom support, a fixing rod, a fixing ring, a motor, a centrifugation block and a compression spring, the upper end of the fixing rod is connected with the fixing ring, the lower end of the fixing rod is connected with the fixed bottom support, the fixing ring is sheathed on the outer surface of the transparent anti-sputtering cover and is positioned above the grading cleaning sieve, the motor is fixedly arranged at the bottom of the fixed bottom support, an output rotating shaft of the motor is connected with one end of the centrifugation block, the upper end of the compression spring is connected with the fixed bottom support, and the lower end of the compression spring is connected with the base.
Owner:XIAMEN UNIV

A Classification Method of Offshore Sediment Grain Size Based on Spectral Technology

The present invention is a method for classifying the particle size of offshore sediments based on spectrum technology. The steps are as follows: S1. Obtain samples of offshore sediments with different particle sizes and collect spectra; S2. Divide the full spectrum of offshore sediments into m bands, Establish the particle size model of offshore sediments for each band; S3. Select n optimal models from m offshore sediment particle size models, and use the fusion algorithm for fusion processing to obtain the optimal Classification result; S4. The n optimal models and fusion algorithm used in the obtained optimal model are used as the model and method for the particle size classification of offshore sediments to predict the particle size of unknown offshore sediments. The invention breaks the original particle size analysis method, reduces the time for traditional method of marine sediment particle size measurement, realizes the prediction of offshore sediment particle size classification quickly and non-destructively, provides a theoretical basis for searching for sediment characteristic bands, and provides a theoretical basis for particle size analysis. The division provides a solution.
Owner:OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI +1

An online measurement method of frequency-sweeping ultrasonic focused sediment particle size distribution

The invention discloses an on-line measurement method for frequency-sweeping ultrasonic focusing type sediment particle size distribution. The present invention builds a set of measuring devices with a focused ultrasonic probe as the core, and at the same time uses the screening method and microscope method to configure sediment samples of different particle sizes; debugs the measuring system, and starts the measuring device after it is accurate; changes the ultrasonic wave Frequency, a series of experiments with sediment particle size as a variable were carried out at different ultrasonic frequencies to obtain the data of the received waveform; phase space segmentation and symbol dynamic filtering based on the Hilbert transform were performed on the collected signals to obtain the same Measurement of parameter values ​​related to particle size; data fitting is performed on the scatter diagrams of measurement and sediment particle size at different frequencies to obtain a sediment particle size measurement model. The invention can effectively reduce the scattering attenuation in the propagation process, increase the acceptable sound energy at the receiving transducer, improve the signal-to-noise ratio, and the sensitivity and measurement accuracy of the entire measurement system.
Owner:CHINA JILIANG UNIV

Method and system for determining sediment flux approach channel and forebay of pump station

The embodiment of the invention provides a method for determining sediment flux of an approach channel and a forebay of a pump station, and the method comprises the steps: obtaining the Sierz number,the sediment settling speed and the ratio of the settling time of sediment in a sediment transport layer to the flow period, and obtaining the phase drift of the sediment to the flow speed and the phase residue of the sediment; taking the flowing speed of the outer boundary layer as a boundary condition, obtaining the depth of the sand-containing moving bed surface eroded by the water flow, the thickness of the reciprocating flow boundary layer and the boundary layer flow speed advance function according to the sediment particle size, the flowing period, the Sierz number, the sediment settlingspeed, the phase drift of the sediment to the flow speed and the phase residue of the sediment, and further determining the sediment flux. Design and calculation are carried out through the determined relevant phase difference and the determined thickness parameters of the movable bed surface and the boundary layer, the time response of the instantaneous sediment flux relative to the hydrodynamiccondition in the reciprocating flow process can be reflected, the change of the movable bed surface and the effect of the movable bed surface are reflected, and underestimation of the half-cycle average sediment flux is avoided.
Owner:CHINA AGRI UNIV

Offshore sediment particle size classification method based on spectrum technology

The invention relates to an offshore sediment particle size classification method based on a spectrum technology, which comprises the following steps: S1, acquiring offshore sediment samples with different particle sizes, and collecting spectrums; s2, dividing the full spectrum of the offshore sediment into m wave bands, and establishing an offshore sediment particle size model for each wave band; s3, selecting n optimal models from the m offshore sediment particle size models, and performing fusion processing by adopting a fusion algorithm to obtain an optimal classification result of different particle sizes of the optimal offshore sediment; and S4, taking n optimal models used by the obtained optimal models and a fusion algorithm as a model and a method for classifying the particle sizes of the offshore sediments to predict the particle sizes of unknown offshore sediments. According to the invention, the original particle size analysis method is broken, the time for measuring the particle size of the ocean sediments by the traditional method is shortened, the classification prediction of the particle size of the offshore sediments is quickly and nondestructively realized, a theoretical basis is provided for searching characteristic wave bands of the sediments, and a solution is provided for dividing the particle size.
Owner:OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI +1

A Method and Device for Determining Single Width Sediment Delivery Rate of Drain Channel and Forebay of Pumping Station

The embodiment of the present invention provides a method and device for determining the single-width sediment delivery rate of the diversion channel and forebay of the pumping station. diameter, the ratio of sediment to water density and the kinematic viscosity coefficient of water; obtain the Shields number and the friction factor of the reciprocating flow sandy bed surface; based on all the above parameters, and analyze the boundary layer asymmetry of the moving bed surface , to obtain the erosion depth and boundary layer thickness to obtain the instantaneous single-width sediment delivery rate in volumetric flow under reciprocating flow conditions. The embodiments of the present invention carry out design and calculation through the determined boundary layer thickness of the relevant moving bed surface and phase difference parameters, reflecting the phase residue of the sediment transport rate after the flow velocity is reduced and the phase drift relative to the flow velocity, given the instantaneous sediment transport rate and flow velocity The relationship between the number of times and the judgment of the negative net sediment transport caused by the large phase difference in the asymmetric flow.
Owner:CHINA AGRI UNIV

Method for measuring partition coefficient in laboratory sediment and surface water system

The invention relates to a method for measuring a partition coefficient in a laboratory sediment and surface water system, and belongs to the technical field of nuclear environment simulation, the method comprises the following steps: S1, pretreating and analyzing a sediment-surface water system reaction medium to obtain a sediment particle size distribution spectrum, sediment components and surface water sample components; s2, preparing sediment-surface water system turbid liquid with set solid concentration; s3, preparing a radioactive tracing solution with a set nuclide initial concentration; s4, adding the radioactive tracing solution into the sediment-surface water system, and oscillating to enable the sediment-surface water system to reach adsorption equilibrium; and S5, measuring the equilibrium concentration of the radionuclide, and obtaining the distribution coefficient in the sediment-surface water system according to the water phase equilibrium concentration and the solid phase equilibrium concentration. By means of the method, accurate parameter support can be provided for concentration field distribution, nuclide migration rules and migration mathematical model establishment and deposition amount calculation of the liquid effluent in the receiving water body.
Owner:CHINA INST FOR RADIATION PROTECTION

Estuary and coast water body suspended sediment deposition time sequence monitoring device

The invention provides an estuary and coast water body suspended sediment deposition time sequence monitoring device, comprising a deposition moment recording unit and a deposition collection unit, wherein the deposition moment recording unit is arranged on one side to record a suspended sediment deposition moment; the deposition collection unit is arranged on the other side to slow down the influence of the external flow velocity and prevent the collected sediment from resuspending and escaping; and the deposition moment recording unit and the deposition collection unit are fixedly connectedside by side. The suspended sediment in estuary and coast water bodies can be collected quickly and massively, the sedimentary texture of the suspended sediment is maintained in the process of collecting the suspended sediment in the estuary and coast water bodies, and meanwhile the deposition moment and the corresponding water level change are recorded synchronously; by analyzing the collected sedimentary structure of the collected suspended sediment, the sediment transport process in the water body is researched; by analyzing the sediment particle size and performing corresponding isotope observation, the sediment source is understood; and by adoption of collected suspended sediment calibration and an optical turbidity sensor of calibration synchronous observation, the error can be reduced by 3-5 times compared with the near-bottom sediment sample calibration.
Owner:EAST CHINA NORMAL UNIV

An information processing system and method for eutrophication tidal flat sediment habitat restoration

The invention belongs to the technical field of information processing, and discloses an information processing system and method for eutrophic tidal flat sediment habitat restoration. The eutrophic tidal flat sediment habitat restoration system includes: a sediment component detection module and a pollutant detection module , Sediment particle size detection module, central control module, particle size data processing module, sampling module, screening module, heating and dissolving module, repair module, display module. The invention has fast detection and analysis speed, high sensitivity and wide detection range through the pollutant detection module, can comprehensively detect organic pollutants, does not occur the phenomenon of missed detection, and is convenient to operate; it shortens the detection time, reduces the detection cost, and is effective. The ability to detect organic pollutants in sediments is greatly improved; at the same time, through the particle size data processing module, the calculation of particle size parameters of sediments and the naming of sediments can be more standardized, the processing operations are simpler, and the results are more accurate.
Owner:HUNAN UNIV OF ARTS & SCI

A treatment method for heavy metal contaminated sediment based on particle size distribution

ActiveCN104803571BSolve the situation that the disposal method of polluted sediment is systematicAddressing situations where the disposition is systemicSpecific water treatment objectivesWater contaminantsSediment particle sizeMunicipal sewage
The invention provides a method for treating bottom mud polluted by heavy metals based on particle size distribution. The method comprises the following steps of (1), sieving the bottom mud polluted by the heavy metals so as to obtain pebble, coarse sand, medium sand, fine sand and mud components; (2), setting judgment conditions according to different requirements on heavy metal contents and heavy metal concentration of leachate in the mud treatment standard and solid waste and hazardous waste treatment standard of a municipal sewage treatment plant; (3), performing heavy metal content detection analysis on the mud components with various particle sizes, and sequentially judging and treating. According to the reduction, hazard-free treatment and recycling treatment principle, the particle size distribution characteristics of bottom mud and the local socio-economical level and treatment way conditions of a project are fully combined, and measures are adjusted to local conditions, main treatment modes are modular and programmable, so that reference and operation are convenient; the method is simple to operate and convenient to implement, can be used for solving the systematic situation of an existing method for treating the bottom mud polluted by the heavy metals, and has relatively high pertinence and flexibility.
Owner:SHANDONG ACAD OF ENVIRONMENTAL SCI CO LTD

Method for determining average slope angle of sediment deposits in front of dam of river retaining building

The invention discloses a method for determining the average slope angle of sediment deposits in front of a dam of a river retaining building, which is mainly applied to the fields of water conservancy projects, channel projects, river regulation and the like, and the method recognizes that the sediment particle size of a riverbed is closely related to the size of water flow, and the near-bottom flow velocity of the water flow in a river channel accords with Gaussian distribution. And according to the distribution probability of the water flow, the probability distribution of the riverbed sediment particle size is deduced. On the basis, the characteristic flow and the characteristic water level of the river channel, the characteristic parameters of the river channel, the resistance coefficient of a riverbed and the like are counted, and the average particle size of the sediment deposits in front of the dam of the river retaining building is obtained through numerical integration. Through an indoor test, a relational expression between the sediment particle size and the sediment water slope angle is established, the water slope angle of sediment of the sediment deposition body in front of the river dam is obtained through the relational expression, and the angle is the average slope angle of the sediment deposition body in front of the river dam.
Owner:杭州京杭运河二通道建设投资有限公司 +2

A method and system for determining the sediment flux in the diversion channel and forebay of a pumping station

The embodiment of the present invention provides a method for determining the sediment flux in the diversion channel of the pumping station and the forebay, wherein the method includes: obtaining the Shields number, the sedimentation velocity, and the sedimentation time and flow of the sediment in the sand transport layer The ratio of the period, and obtain the phase drift of the sediment to the flow velocity and the phase residue of the sediment; the flow velocity of the outer boundary layer is used as the boundary condition, according to the sediment particle size, flow period, Shields number, sediment settlement velocity, sediment For the phase drift of the flow velocity and the phase residue of the sediment, the depth of the sandy bed surface eroded by the water flow, the thickness of the reciprocating boundary layer and the advance function of the boundary layer velocity are obtained, and then the sediment flux is determined. Through the design and calculation of the determined relevant phase difference, dynamic bed surface and boundary layer thickness parameters, it can reflect the time response of the instantaneous sediment flux in the process of reciprocating flow relative to the hydrodynamic conditions, and reflect the changes of the dynamic bed surface and Moving bed surface effect, to avoid the underestimation of the half-period average sediment flux.
Owner:CHINA AGRI UNIV

Analysis method, device, medium and equipment for original river channel gradient of ancient river deposition

The invention relates to an original river channel gradient analysis method, device, medium and equipment for ancient river deposition. The method comprises the following steps of a, selecting a completely stored river channel, and measuring the sediment density, the sediment particle size median, the river water density and the river channel full bank depth on a riverbed; b, calculating effective relative density of the sediment based on the sediment density and the river water density; c, calculating the particle Reynolds number of the sediments under the full-bank water depth condition based on the effective relative density of the sediments and the particle size median of the sediments; d, calculating the critical starting stress of the sediment on the basis of the particle Reynolds number of the sediment under the full-bank water depth condition; e, calculating a riverbed critical water flow velocity based on the critical starting stress of the sediment; f, based on the riverbed critical water flow velocity and the riverway full bank depth in the step a, calculating the average water flow velocity of the cross section of the riverway; and g, on the basis of the average water flow speed of the cross section of the river channel in the step f and the river channel full bank depth in the step a, calculating an original river channel gradient.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)

Sediment particle size detection device and method based on fluid-solid interface wave

The invention discloses sand grain diameter detection device and method based on a fluid / solid interface wave. Ultrasonic detection is applied to the detection of river sand grain diameter, Scholte wave energy is mainly focused in a fluid near a fluid / solid interface, and has the characteristics of largest amplitude, small frequency dispersion and high detection precision, the detection device is characterized in that a singlechip intelligent control module generates a pulse signal, an excitation signal generating module transmits the pulse signal in multiple paths of Scholte waves, a receiving module receives the corresponding Scholte waves, the signal is transmitted to the singlechip intelligent control module for performing calculation to obtain a relation graph between a number of the Scholte waves and the grain diameter, and a defect in existing grain diameter detection is well made up; the detection device has the advantages of small size, convenience in use, wide detection range to the grain diameter and high reliability, is easy to carry, is suitable for detection of the field river sand grain diameter detection, and is beneficial to the actual popularization and use.
Owner:HOHAI UNIV CHANGZHOU
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