A simulation device and experimental method for three-dimensional solute transport in porous media

Abstract

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.

Description

technical field [0001] The invention relates to the field of soil physics research, in particular to a simulation device and an experimental method for three-dimensional solute migration in porous media. Background technique [0002] With the continuous development of science and technology, the contradiction between human production activities and the natural ecological environment has become more and more acute. The use of a large number of pesticide reagents and the discharge of sewage from enterprises have caused serious water pollution. The flow continuously migrates and diffuses, which destroys soil productivity and seriously threatens human health. Therefore, it is very important to reveal the migration law of solute transport in porous media. [0003] The traditional methods for observing the solute transport process mainly include horizontal soil column method, vertical soil column method and field tracer test method. However, regardless of the horizontal soil colu...

AI Technical Summary

Problems solved by technology

However, regardless of the horizontal soil column method or the vertical soil column method, due to the limitation of the side wall of the column, the water flow can only be forced to move nearly one-dimensionally, while in nature, due to the heterogeneity of the porous medium itself, the water flow The movement is often three-dimensional, and the difference in the form of this movement will have a greater impact on the experimental results, thereby causing observation errors

The field tracer test method maintains the movement shape of the water flow well, but the observation of the pollutant dispersion plume often requires a large number of observation wells. Too few observation wells will affect the observation accuracy, but increasing the number of observation wells will not would cause enormous economic pressure

Images