A simulation measurement method for subsurface flow exchange under different groundwater recharge conditions

Abstract

The invention discloses a simulation measurement method for subsurface flow exchange under different groundwater supply conditions, which comprises the following steps: laying a clay layer and a quartz sand layer at the bottom of a water tank in sequence, laying water pipes with holes on both sides of the inner wall of the water tank; placing a channel shape control plate on the The center of the water tank is inserted into the quartz sand layer, and the quartz sand inside the control board is taken out to form an artificially simulated river channel; the control board is taken out, colored water is injected into the water tank, and clear water is injected into the perforated water pipe. Inside, the quartz sand shows different shades of color with the lateral undercurrent exchange; the migration track of the color is recorded by the camera and display; when the color data of the undercurrent exchange area no longer changes, the water in the tank is discharged. The invention avoids manual injection of tracers, and has high efficiency and fast speed; it can simulate the lateral supply of groundwater to surface water; it can continuously measure high-precision data, and test materials can be reused; it is sensitive and intuitive to measure, and can accurately simulate lateral Undercurrent exchange transient process.

Description

technical field [0001] The invention relates to a method for simulating and measuring the water volume exchange of the subsurface layer in the bank zone, in particular to a method for simulating the measurement of the subsurface exchange under different groundwater supply conditions. Background technique [0002] The hypoflow zone is an interlaced area of ​​energy cycle and material exchange between shallow groundwater and surface water in the riverbed. In this mixed area, there are dissolved gas concentration gradients, organic life body concentration gradients, pH gradients, and temperature gradients. These physical, biological and chemical gradients provide an important living environment for many invertebrates and are hotspots for biodiversity research; these gradients also lead to biogeochemical reactions, which ultimately affect the water quality of rivers. [0003] Undercurrent exchange can be divided into vertical underflow exchange in the riverbed underflow zone and...

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Problems solved by technology

[0004] Purpose of the invention: The purpose of the present invention is to provide a simulation measurement method for subsurface flow exchange under different groundwater recharge conditions, which solves the problem in the prior art that groundwater recharge conditions are not considered and the transient process of lateral subsurface flow exchange cannot be accurately simulated

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