33 results about "Pollutant transport" patented technology

The invention discloses a project scheduling and tidal river network pollutant transport process coupled numerical value simulation method. The method comprises the following steps of: establishing a tidal river network one-dimensional hydrodynamic force-water quality model; establishing a project application model to realize accurate and quantitative description of a project type and an application manner; solving the tidal river network one-dimensional hydrodynamic force-water quality model and the project application model by adoption of a finite difference format and a four-cascade solution; and establishing a gate pump group multi-target optimal scheduling model through aiming at targets of flood control, flood drainage and water quality improvement and project constraint conditions. According to the method disclosed by the invention, the accurate and quantitative description of interaction of a hydrodynamic process, a pollutant transport process and project scheduling is realized; and on the basis of simulating the project scheduling, the established gate pump group multi-target optimal scheduling model is utilized to obtain a gate pump group combined optimal scheduling scheme, so that the practical application value of the project scheduling simulation can be remarkably improved.

Apparatus and methods are disclosed for passive millimeter wave measurements to provide tropospheric profiles of temperature, water vapor, cloud liquid water, pressure, and refractivity utilizing a single band microwave receiver operating in the vicinity of the water vapor emission line centered at 183.31 GHz or other millimeter wave water vapor line. Ancillary meteorological measurements may be provided to refine profile outputs. Retrieval method training adapts and refines system output to provide useful information for weather nowcasting and forecasting, aviation safety, transport of pollutants, prediction of fog and other weather phenomena, and radar and optical ducting prediction.

The invention discloses a pollutant transport flux measurement and calculation method based on ground-based MAX-DOAS. The method comprises the steps: observing by using the ground-based MAX-DOAS to obtain the slant column density of polluted gas, and transforming into the vertical column density; obtaining a high-resolution two-dimensional distribution result of the polluted gas on an observation interface by using a satellite data result; using wind direction, wind speed information and an MAX-DOAS site location, determining a transport interface passing through an MAX-DOAS site, combining with a satellite data gridding result, and fitting to obtain a distribution curve of the polluted gas density along the interface; correcting satellite data by using the MAX-DOAS measurement result, to obtain a density distribution curve based on the ground-based MAX-DOAS vertical column density result; and finally, using a flux calculation formula, combining with relevant parameters, and calculating to obtain the transport flux of the polluted gas. The observation and measurement method is simple, apparatuses are easy to implement, the cost is low and the algorithm is mature.

The invention belongs to the technical field of the water ecological environment, and particularly to a device and a method for stimulating pollutant transport and upstream salty water of a riverway with a repeated tidal flow. The device comprises an upstream flow control device, a middle water tank device and a downstream tidal flow control device, and is characterized in that the upstream flow control device comprises a water inlet pipe, a constant flow water tank and an upstream water level control water tank; the middle water tank device comprises a water tank body, a speed measuring device and a pollutant sewage inlet tank; the downstream tidal flow control device comprises a tide water level control water tank, a tide backflow stimulation water tank, a compensation or seawater salinity stimulation water tank; the upper end of the water tank body is connected with the upstream water level control water tank while the lower end thereof is connected with the tide water level control water tank; the tide water level control water tank is connected with the tide backflow stimulation water tank; the compensation or seawater salinity stimulation water tank is connected with the tide backflow stimulation water tank. The device and the method for stimulating pollutant transport and upstream salty water of riverway with the repeated tidal flow can stimulate transport and diffusion rules of the pollutants in the riverway with the repeated tidal flow (the upstream salty water rules), and can be widely applied to the simulation tests in the technical field of the water ecological environment.

The invention discloses a pollutant transport model device under saturated-unsaturated soil medium conditions. The pollutant transport model device is formed by three parts of a main body part, a constant water level water tank and a solute spraying device, wherein the main body part is connected with the constant water level water tank through a transparent flexible pipe; the solute spraying device is arranged on the upper end of the main body part. Compared with a previous saturated soil medium model, a transport model designed by the invention can be used for comprehensively and actually describing soil original structure distribution types under an outdoor natural situation, and a simulation test result is more scientific; the transport model disclosed by the invention has the advantages that pollutants are continuously poured, and the whole medium condition of the transport model is enabled not to change, i.e., improvement is carried out on the basis of the working principle of an original Markov bottle, and a low flow speed state is enabled to be kept on the premise that the flow speed is constant, so that the practicability of the transport model is directly increased.

The invention discloses a water-sand interface pollutant transport experiment device and an implementation method thereof. The experimental device comprises: an experimental solution tank connected with a water tank main body; a multi-pump linkage system formed by connecting five groups of centrifugal pumps and valves in parallel; an upstream pool located at the front end of the water tank; a simulation river bed water tank main body and a sediment retaining pool; a multi-frequency water level control system comprising a drive system, a transmission system and a water level control valve; anda tail pool arranged at the tail end of the water tank. The experiment method mainly comprises the steps of: establishing an indoor circulating water tank and an experimental sand slope, and regulating the circular flow and the size and frequency of the water depth to simulate the transport of the pollutants at a water-sand interface under the duration drive of different flood peaks and flood. Theexperiment data and the related parameters are collected to simulate the transport of the pollutants at the water-sand interface under the multi-frequency flood drive to reflect the influences of different-parameter floods of the river on the transport of the pollutants at the water-sand interface and the phreatic zone, the experiment device can change a plurality of flood parameters such as theflow, the flow change frequency, the water level and the water level change frequency, and therefore, the experiment is convenient, and the achievement is intuitive.

The invention discloses a multifunctional soil body permeability and pollutant interception capacity testing device which has the capabilities of controlling water head difference, water and soil contact area and pressure direction and measuring pollutant intercepting capacity of a soil body and is used for researching anti-seepage characteristics and pollutant intercepting characteristics of a vertical anti-seepage curtain of a landfill. The testing device is composed of a cavity, a concentration monitoring system, a pressurization system, a piston, a reaction frame and a base. By controllingthe piston, the pollutant transport law of the vertical curtain such as clay-bentonite under different water and soil contact areas, water head differences and bidirectional pressure conditions can be simulated, the pollutant interception capacity of the vertical curtain is evaluated, and permeability and pollutant interception performance indexes of different positions of the isolation wall areobtained. The device is simple and convenient in design, diverse in function and high in integrity, and can be used for testing the permeability and the sewage interception capacity of the vertical anti-seepage curtain soil body.

The invention provides an analogy method for heavy nonaqueous-phase organic pollutant transport in a semitransparent particulate material. The analogy method comprises the following steps: determining the porosity, the permeability and the tubular billet inlet pressure of the semitransparent particulate material through the visible light microcosmic imaging technology and the microcosmic fractal model quantifying of the material particle, and using a new relative permeability-saturability model based on a BC model to describe the relative permeability in the DNAPL long-term transport process, and executing the accurate analogy to the whole DNAPL complicated long-term transport process by using UTCHEM. The method has the high simulation accuracy to the DNAPL long-term transport, and is rapid, economic and efficient. The method has extensive application prospect in the transport research, such as the measurement of the semitransparent material property and the material internal fluid and in the repair project design of the aquifer DNAPL pollution.

This invention relates to, in order to numerically analyze contaminant transport in groundwater, a method of analyzing contaminant transport under Cauchy boundary conditions using an improved Lagrangian-Eulerian method, wherein problems of a conventional Lagrangian-Eulerian method able to analyze only high Peclet numbers are solved, and which is configured to analyze a new numerical matrix constructed in such a manner that a Eulerian method is applied to an element adjacent to Cauchy boundary conditions and a conventional Lagrangian-Eulerian method is applied to an internal element, thereby enabling accurate numerical analysis of contaminant transport at various Peclet numbers including not only high Peclet numbers but also particularly low Peclet numbers under Cauchy boundary conditions.

The invention relates to an organic pollutant migration numerical model substitution method based on a multi-core extreme learning machine, and the method comprises the following steps: building an underground water organic pollution multiphase flow migration numerical model according to observation data, determining pollution source characteristics, aquifer parameters and the value range of each variable, which have relatively high contribution degree to the spatial and temporal distribution of pollutants, in the model; preparing a training sample set; training a single-kernel extreme learning machine substitution model of the multiphase flow numerical model; establishing a nonlinear programming optimization model of kernel function key parameters and kernel function combination weights; and solving the optimization model by using a genetic algorithm, identifying an optimal kernel function parameter and a combination weight, and constructing a genetic evolution multi-kernel extreme learning machine intelligent substitution model of the numerical model. The problem of substitution of the underground water organic pollution multiphase flow numerical model is solved, the calculation efficiency of pollutant transport simulation prediction is improved, and an efficient solution is provided for underground water pollution source characteristic and pollutant transport parameter inversion identification.

Methods for reducing the transport of contaminants in groundwater and methods for reducing the contamination of groundwater are disclosed. The methods may include adding a reagent to groundwater and contacting a contaminant with the reagent to form a precipitate and compiling the precipitate to form a barrier to groundwater flow. Systems for reducing the transport of contaminants in groundwater including an arrangement for adding a reagent to a groundwater flow path and a formed barrier comprising contaminant precipitate in the groundwater flow path are also disclosed.

The invention discloses a river pollution source analysis and pollutant transport calculation method and system, and the method comprises the steps: determining a target sub-basin based on a basin space attribute database and a social economic information database of a target basin, building a river main and branch water quality monitoring section network of the target basin, and determining a calculation unit; on the basis of a calculation unit and a social and economic information database, calculating the pollutant river entering quantity of each target sub-basin; based on a calculation unit and a drainage basin space attribute database, calculating the monthly average flow of the main and branch node sections; based on the pollutant river entering amount and the monthly average flow of the section of the main and branch flow nodes, considering the influence of karst development on the river leakage amount and the supply amount, and constructing a target drainage basin river water amount and water quality migration simulation model; the model is used for simulating the migration process of each pollutant in a target drainage basin, and scientific guidance is provided for drainage basin water environment treatment and implementation of water pollution control measures.

The invention discloses a pollutant health risk assessment method based on process simulation and uncertainty analysis. According to the invention, health risk assessment is combined with groundwaterpollutant migration process, and TOUGH2 software is utilized to simulate temporal and spatial distribution of organic pollutants in groundwater. In order to improve the reliability of assessment results, impact of the uncertainty of pollutant transport on human health risk assessment is taken into account, and inversion identification on key parameter media permeability is carried out by adoptinga Markov chain Monte Carlo simulation method. The method improves the reliability of risk assessment results by analyzing the uncertainty of pollutant migration simulation, and provides decision-making information for the management and prevention of contaminated sites.

The invention discloses a simulation device for three-dimensional solute transport in a porous medium and an experimental method. The simulation device comprises a sand tank, an injection mode adjusting device, a liquid supply device, a penetrating fluid collector, a water stop sheet, a well casing, a conductivity measuring electrode, a data collector and a data processing system. The sand tank ishorizontally placed, the interior of the sand tank is divided into three sub-chambers from left to right, the sub-chambers are separated through baffles, a plurality of water permeable holes are evenly and densely distributed in the baffles, the left chamber is connected with a liquid supply device, the middle sub-chamber is used for being filled with a porous medium, and the right chamber is vacant and connected with a penetrating fluid collector; the well pipes are evenly distributed in the porous media in the sand groove, dense water permeable holes are distributed in the side walls of theperipheries of the well pipes, and a conductivity measuring electrode is distributed in each cavity. The three-dimensional solute transport condition in the porous medium can be simulated and observed, and the influence of medium heterogeneity on pollutant transport can be explored.

The invention discloses a method for quantifying solute transport multi-scale characteristics in a complex medium. The method comprises the steps of selecting a solute transport process in a concretecomplex medium as a research object, determining a test condition, observing a movement trajectory of a solute particle to obtain test data R of a mean square displacement of the solute particle, wherein R is a set of average values of distances between positions x of all particle at the t moment and respective initial point when the movement time is t; deducing a multi-scale transport rate of thesolute transport according to a distributed step fractal derivation model or an equivalent form thereof; calculating a value of a parameter c in the multi-scale transport rate in combination with thetest data R of the mean square displacement of the solute particle; and obtaining multi-scale characteristics of the solute transport in the complex medium according to the value of the parameter c,and classifying the solute transport process. The method for quantifying the solute transport multi-scale characteristics in the complex medium has broad engineering application prospects, can be usedfor prediction, assessment and management of pollutant transport. Compared with an existing model or technology, the method is more convenient for engineering use.

The invention discloses a GPU acceleration-based pollutant transport high-resolution numerical simulation method, which comprises the steps of reading a DEM terrain file composed of high-resolution unit grids to obtain an assigned variable; reading an initial condition and a boundary condition, and adopting a finite volume method space discrete control equation to exchange and store a variable from a CPU to a GPU; dividing a dry-wet calculation area, and calculating flux on a unit grid interface on the GPU by adopting an HLLC approximate Riemann solver; calculating a control equation source item on the GPU; calculating the time step length of iterative updating according to the library Random number; obtaining hydraulic elements and concentration information of all the unit grids; and copying the hydraulic elements and the concentration information from the GPU video memory to a host memory and outputting the hydraulic elements and the concentration information. The problem that in theprior art, a numerical model for researching the migration movement law of water pollutants is poor in operation efficiency and precision is solved.

The invention provides a three-dimensional sampling method for simulating transport of river contaminations. The method is characterized in that during contamination transport on-site simulation test, a catamaran reaches a testing section before contamination clusters; as the contamination clusters approach the testing section, the position of the catamaran is adjusted so as to allow the contamination clusters to be located between two boats and to be free of disturbance; and then a multi-point sampler is used to extract water samples at different water depths and different distances from an initial point so as to realize measurement of three-dimensional distribution of the concentration of the river contaminations. The three-dimensional sampling method provided by the invention realizes simultaneous and rapid sampling of a plurality of sampling points and guarantees representativeness and authenticity of the water samples.

The invention discloses a pollutant health risk assessment method based on process simulation and uncertainty analysis. The method combines the health risk assessment with the migration process of groundwater pollutants, and uses TOUGH2 software to simulate the temporal and spatial distribution of organic pollutants in groundwater . In order to improve the reliability of the evaluation results and consider the impact of pollutant migration uncertainty on human health risk assessment, the key parameter media permeability was identified through the Markov chain Monte Carlo simulation method. This method improves the reliability of risk assessment results by analyzing the uncertainty of pollutant migration simulation, and provides decision-making information for the management and prevention of polluted sites.

Polycrystalline silicon chunks are packed for further processing and / or for shipment with minimal contamination by introducing the chunks into a cardboard container lined with a non-contaminating plastic. The process is economical, avoids the problems associated with packaging in plastic bags, and provides far less contamination and spillage during transport.

The invention discloses a device for simulating influence of a puddle in a pipeline on pollutant transport and a working method. The device comprises a constant-head water tank, a circular pipe, a flow control valve, an electromagnetic flowmeter, a carrier, a rectangular-outlet water tank and a syringe, wherein when single pipeline solute transport is simulated, the carrier is a circular pipe; when pipeline and water tank solute transport is simulated, the carrier is a water tank. The device has the advantages that the outlet solute concentration curve under different experiment conditions can be obtained fast by changing the pipeline structure and regulating flow rate, and a quite effective method is provided for the quantitative analysis of the influence of the puddle in the pipeline on solute transport.

The invention provides a three-dimensional sampling device for simulating transport of river contaminations. The three-dimensional sampling device is composed of a bank control point, a catamaran sampling platform and a multi-point sampler. The device is characterized in that the catamaran sampling platform moves in a river under the control of the bank control point; and when the catamaran sampling platform reaches a sampling position, the multi-point sampler installed on a sampling device takes water samples at different water depths and different distances from an initial point from a to-be-measured section. The three-dimensional sampling device provided by the invention can meet requirements for safety, easy operation, small disturbance to a flow field of river water and the like at the same time, has high sampling efficiency and accurate sampling position and guarantees accuracy and representativeness of the water samples.

The application discloses a groundwater quality seepage simulation experiment device and its use method, which relate to the field of groundwater hydrodynamic simulation and groundwater pollutant movement dynamics. The experimental device includes a sand box, a water supply device, and a water quality detection device. Front panel, rear panel and side panels, the front and rear panels are connected by the bottom plate, the first extension plate and the second extension plate are connected on both sides of the bottom plate, and the infiltration water receiving box is arranged under the bottom plate, and the infiltration water receiving box and the water quality detection device There are multiple slots on the inside of the front and rear panels, side slots on the left and right sides of the inside, side panels are placed in the side slots, and permeable stones are placed in the slots; electric telescopic rods and pushers are installed on the first extension board plate, the second extension plate is provided with an electric telescopic rod, a rotating motor and a rotating loosening rake, and the electric telescopic rod, the water quality detection device and the rotating motor are all connected to the controller. The experimental device adopts an assembled structure, which is conducive to improving and adjusting the device according to the actual situation.

The invention discloses a simulation device for three-dimensional solute transport in a porous medium and an experimental method. The simulation device comprises a sand tank, an injection mode adjusting device, a liquid supply device, a penetrating fluid collector, a water stop sheet, a well casing, a conductivity measuring electrode, a data collector and a data processing system. The sand tank ishorizontally placed, the interior of the sand tank is divided into three sub-chambers from left to right, the sub-chambers are separated through baffles, a plurality of water permeable holes are evenly and densely distributed in the baffles, the left chamber is connected with a liquid supply device, the middle sub-chamber is used for being filled with a porous medium, and the right chamber is vacant and connected with a penetrating fluid collector; the well pipes are evenly distributed in the porous media in the sand groove, dense water permeable holes are distributed in the side walls of theperipheries of the well pipes, and a conductivity measuring electrode is distributed in each cavity. The three-dimensional solute transport condition in the porous medium can be simulated and observed, and the influence of medium heterogeneity on pollutant transport can be explored.

The invention discloses a method for evaluating the migration characteristic of pollutants in a no-filling rough single fracture. The method concretely comprises the following steps: determining the kind and the dissolvability of the pollutants; establishing a rough single fracture model by using a fractal theory; establishing a no-filling rough single fracture value model based on a finite element technology; evaluating the migration process of the pollutants in the fracture by using a convection-dispersion equation for soluble pollutants; and evaluating the migration process of the pollutants in the fracture by using a level set technology for non-aqueous phase liquid pollutants. The method has the following advantages: 1, evaluation of the migration characteristic of the soluble pollutants in the fracture is realized; 2, evaluation of the migration characteristic of the non-aqueous phase liquid pollutants in the fracture is realized; and 3, migration parameters of the pollutants in the fracture, obtained in the invention, can be used as underground water pollution repairing base parameters.

The invention discloses a project scheduling and tidal river network pollutant transport process coupled numerical value simulation method. The method comprises the following steps of: establishing a tidal river network one-dimensional hydrodynamic force-water quality model; establishing a project application model to realize accurate and quantitative description of a project type and an application manner; solving the tidal river network one-dimensional hydrodynamic force-water quality model and the project application model by adoption of a finite difference format and a four-cascade solution; and establishing a gate pump group multi-target optimal scheduling model through aiming at targets of flood control, flood drainage and water quality improvement and project constraint conditions. According to the method disclosed by the invention, the accurate and quantitative description of interaction of a hydrodynamic process, a pollutant transport process and project scheduling is realized; and on the basis of simulating the project scheduling, the established gate pump group multi-target optimal scheduling model is utilized to obtain a gate pump group combined optimal scheduling scheme, so that the practical application value of the project scheduling simulation can be remarkably improved.

The invention discloses a drainage basin non-point source pollutant transport simulation test device and method, an inlet of a spraying device is provided with an electromagnetic flowmeter, a pressure sensor is arranged below a sand box, a water outlet is connected with a tipping-bucket rain gauge through a pipeline, a conductivity probe is arranged on the pipeline, and a water level recorder is arranged in the sand box; a tensiometer and a soil humidity sensor are also arranged in the sand box; during testing, rainfall is simulated through a pulse method, precipitation, underground water storage variable, discharge flow, tracer discharge concentration, underground water level and soil moisture content are monitored through a sensor, a change curve of the monitoring variables along with time is generated, and the correlation between the tracer discharge concentration and other monitoring variables is researched based on the change curve; and the underground transportation duration of the tracer agent is calculated through a transient transportation duration distribution theory. According to the method, the influence mechanism of the discharge concentration and the transport duration of the non-point source pollutants can be revealed, the transport duration of the tracer from rainfall to discharge is calculated, and guidance is provided for non-point source pollution prevention and control.

The invention discloses a method and system for determining the transport flux of pollutants in a sea area section, and relates to the field of pollutant diffusion in the sea area. The numerical simulation data of the tidal current is interpolated on the measuring points of the sea area section to be detected, and the water depth, flow velocity and flow direction corresponding to the measuring points are extracted; Average flow rate; Interpolate the data of marine pollutants at the measuring points of the sea area to be detected to determine the average concentration of pollutants between two adjacent measuring points; determine the transport channel of pollutants in the sea area to be detected according to the average flow and the average concentration of pollutants quantity. The invention can realize the detection of pollutant transport flux in the sea area with complex flow state.

The invention discloses an experimental device for monitoring the transport law of pollutants in a variable-gap space, which comprises a box body, a shaft rotation control mechanism, a disc group, a water inlet device and a drainage device, wherein the bottom of the box body is sunken inwards to form a sunken part, and a through hole is formed in the bottom of the sunken part; the shaft rotation control mechanism comprises a hollow rotating shaft, a motor and a bearing, the first end of the hollow rotating shaft is connected with the motor through the bearing, and the second end of the hollowrotating shaft passes through the through hole in the bottom of the sunken part of the box body and extends into the box body; the disc group comprises a first disc and a second disc which have periodicity in the circumferential direction and the radial direction; the hollow rotating shaft penetrates through the center of the second disc and is fixedly connected with the second disc; a gap space is formed between the first disc and the second disc; the water inlet device comprises a water inlet pipe and a water pump; and the drainage device comprises a drainage pipe. The change of the medium void space of the device has periodicity and is known and actively changed, and the device can effectively observe the pollutant transport condition in the change process of the void space.

The invention relates to the field of hydrogeology and specifically relates to an aeration zone solute transport simulating device and method. The aeration zone solute transport simulating device comprises a solution box, a control valve, a centrifugal box and a rainfall disk, wherein the solution box is connected with the centrifugal box through a flow guiding pipe, the control valve is arrangedon the flow guiding pipe, the flow guiding pipe is connected with the rainfall disk, the rainfall disk is arranged at the upper end of the centrifugal box, a solution in the solution box can enter thecentrifugal box through the flow guiding pipe and the rainfall disk. The aeration zone solute transport simulating device can simulate a solute transport process in an unsaturated zone, can more accurately simulate gravitational fields, materials and hydrogeological conditions and can simulate several important control parameters of thermal convection, capillary phenomenon and the like for controlling pollutant transport. The method disclosed by the invention has the advantages of good experimental repeatability, good experiment simulation effect, obvious time-lapse and scale effects and thelike.