33 results about "Pollutant transport" patented technology

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 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 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 discloses a multi-field coupling simulation test device and method for mine groundwater pollution, and the device comprises a constant-temperature water bath box, one side of the constant-temperature water bath box is communicated with a water storage box, the outer side of the water storage box is provided with a control mechanism, and the top of the constant-temperature water bath box is provided with a stress loading mechanism. The stress loading mechanism comprises a covering and pressing steel plate movably connected to the top of the constant-temperature water bath box, a temperature control mechanism and a monitoring mechanism are arranged in the constant-temperature water bath box, and a water level control mechanism is further arranged in the constant-temperature water bath box; the stress loading mechanism, the temperature control mechanism, the monitoring mechanism and the water level control mechanism are electrically connected with the control mechanism, so that four-field coupling of a stress field, a chemical field, a seepage field and a temperature field is realized, and a simulation environment in a pollutant transport process is closer to a real natural condition; the migration process of mine underground water pollutants under the multi-field coupling effect is achieved through scientific and accurate simulation.

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 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.