River lateral undercurrent exchange measuring device and method

Abstract

The invention relates to a river lateral undercurrent exchange measuring device and method. The measuring device comprises a simulation box and a shooting device and is characterized in that a sand layer is laid in the simulation box, a simulated riverway is dug in the upper surface of the sand layer, a water inlet pipe is connected to one end of the simulated riverway and communicated with a water source, a water outlet pipe is connected to the other end of the riverway, the shooting device is used for shooting the migration trajectory, along with water flow, of tracer agent dripped to a bank, and the bank is sand on two sides of the riverway. The river lateral undercurrent exchange measuring device is capable of continuously obtaining high-precision measuring data, cheap to manufacture,simple to operate and long in service life.

Description

technical field [0001] The invention relates to an experimental measuring device, in particular to a measuring device and a measuring method for the lateral undercurrent exchange of a river channel. Background technique [0002] The hypoflow zone refers to the water-saturated sediment layer in the river bed. It is generally defined as the interlaced area of ​​energy cycle and material exchange between shallow groundwater and surface water in the river bed. Containing both surface water and groundwater is an important feature of the hypoflow zone. The hyporheic zone is a mixed zone where there are concentration gradients of dissolved gases, organic organisms, pH and temperature. These physical, biological and chemical gradients, which provide important habitats for many invertebrates and are hotspots for biodiversity research, also lead to biogeochemical reactions that ultimately affect river water quality. [0003] Subsurface exchange is the exchange of water and solutes be...

AI Technical Summary

Problems solved by technology

The early research on subsurface exchange was mainly focused on the riverbed subsurface zone, while the research on lateral subsurface exchange in the riparian zone developed slowly, and most of the research on lateral subsurface exchange was carried out on the basis of field monitoring. The actual river bed and flow state are very complex, and it is difficult to accurately simulate in the laboratory, so there are few studies on the lateral subsurface flow exchange in the riparian zone indoors.

[0005] The research on lateral subsurface exchange in my country started relatively late. At present, the definition of stream underflow zone has been perfected. For the pressure distribution, subsurface exchange, surface water hydrodynamics and bed sand seepage characteristics of the river bank boundary under different topography and flow conditions There have been some research results on the relationship between them, but there is still a significant gap compared with the international frontier. In foreign countries, there have been successful cases of considering subsurface flow exchange into river management and achieving good results.

However, there is still a lack of sufficient mechanistic studies in my country, such as the influence of channel geometry on the lateral undercurrent exchange in the riparian zone is still unclear

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