Indoor sand tank experimental device and experimental method for simulating groundwater exploitation near a river

Abstract

An indoor sand tank experimental device and experimental method for simulating groundwater exploitation near a river. The experimental device includes a water supply system, a sand tank, a river simulation device, a dissolved oxygen monitoring module, a drainage system, and a pressure monitoring module. The inside of the sand tank is divided from left to right. It consists of three sub-chambers, which are separated by water-permeable boards or water-proof baffles. The water-permeable boards are evenly arranged with water-permeable holes. The left sub-chamber is equipped with a water head height adjustment device and is connected to the water supply system. The middle sub-chamber is used to fill the original state of the field. For aquifer and sediment samples, the upper left corner of the middle subchamber is the channel simulation device, and the right subchamber is set as the discharge head control device, which is connected to the drainage system; the pressure transmitter is evenly arranged in the upper medium of the sand tank, and the pressure transmitter can The pressure change in the aquifer is quickly detected, and the data is transmitted to the data acquisition system. The data acquisition system can record the collected pressure information in real time, and realize the exploration of the hydraulic relationship between the river and the aquifer inside the sand tank.

Description

technical field [0001] The invention relates to related research fields such as river dynamics, geochemistry, microbiology and biochemistry, and in particular to an indoor sand tank experimental device and experimental method for simulating groundwater exploitation near a river Background technique [0002] Riverside mining, as the main human activity that changes the hydrodynamic conditions of river water and groundwater, will strongly affect the hydraulic relationship between river water and groundwater. At the same time, it will be affected by river scouring and silting, river water infiltration intensity, water retention time, nutrient flux and redox Conditions will change, leading to complex biogeochemical processes during river infiltration. In addition, due to the effects of physical, chemical, and biological gradients in the infiltration process of river water, reductive dissolution of iron-manganese-related minerals in sediments will occur under anaerobic conditions...

AI Technical Summary

Problems solved by technology

In addition, due to the effects of physical, chemical, and biological gradients in the infiltration process of river water, reductive dissolution of iron-manganese-related minerals in sediments will occur under anaerobic conditions, releasing iron-manganese ions and toxic and harmful metalloids As into the groundwater, threatening Groundwater Quality Safety

[0003] Under field conditions, the composition, structure, and thickness of riverbed sediments are in dynamic changes, and the operating modes and mining volumes of mining wells are diversified. It takes a lot of manpower and material resources to systematically explore the migration and transformation of pollutants.

In addition, under the heterogeneous conditions of riverbed sediments and aquifers, the river water-groundwater hydraulic relationship and the changes in related biogeochemical processes under the joint action of riverbed scouring and silting and groundwater exploitation are still unclear.

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