31 results about "Sediment particle size" patented technology

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.

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.

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.

The invention relates to a real-time detection device for the concentration and grain size of sediment transported near the bottom in shallow sea. It includes eight cylinders fixed on the circular cavity at intervals of 45 degrees around the circumference and arranged radially. The cylinders are equipped with concentration probes and eight particle size probes, and are connected to corresponding data acquisition and processing devices via cables. The above-mentioned Cables and corresponding data acquisition and processing devices are packaged in the ring cavity. The present invention thus constructed has a reasonable structure and low cost, and conveniently solves the problem that the sediment concentration and particle size distribution in shallow sea and near the bottom are difficult to be detected in real time in the form of shifting and jumping in different directions, so as to analyze the relationship between the starting sediment particle size and the particle size distribution. The relationship between hydrodynamic conditions provides a reliable scientific basis for seabed scour research and coastal erosion protection.

A simulation method for river basin sediment traceability based on CAESAR-Lisflood model, including: S1, determining the slope angle threshold of landslide instability in the watershed; S2, establishing the spatial distribution file of the slope angle threshold of landslide instability in the watershed; S3, establishing two-dimensional material sources Index matrix; S4, based on the CAESAR‑Lisflood model, establish a four-dimensional array variable strata[xyindex; z; n, T] representing the surface active stratigraphic system and a three-dimensional array variable grain[xyindex; n, T] representing the composition of sediment particle size , where, xyindex represents the position index, z stores the stratum index; n stores the index corresponding to the range of sediment particle size, T represents the tracking index value, the value range is 1‑m, m is a natural number greater than 1; and S5, using CAESAR‑Lisflood The model simulates and traces the material migration process in different material source regions.

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.

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.

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.

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.

The invention discloses a method for calculating the dynamic particle size of sediment in consideration of different sediment sources in a distributed water-sediment model. Different sources of sediment in the sand process, the weighted average calculation of the comprehensive particle size of the sediment is carried out through the number of sediment particles from each source, and finally the production and transportation of the slope, channel and river link of the target watershed under the simulation of the distributed water-sediment model are obtained amount of sand. The advantages are: considering the source of sediment and realizing the dynamic change calculation of sediment particle size, it is suitable for distributed water and sediment models of various scales, and can make the model sediment particle size change dynamically at different time and space scales, thereby improving The ability of the model to describe reality can effectively improve the simulation accuracy of the distributed water-sediment model.

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.

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.