Experimental apparatus and method for hyporheic zone under field riverbed evolution

Abstract

The invention relates to an experimental apparatus for a hyporheic zone under field riverbed evolution, comprising a foundation pit excavated at the bottom of a riverbed; water-filtering geotextile is spread at the bottom of the foundation pit, a rectangular container formed by splicing and enclosing a plurality of combined plastic plates is arranged above the geotextile, and the bottom of the rectangular container is fixed to the riverbed; the combined plastic plates are each composed of a plurality of plastic plates with round holes, a sampling hole is provided between upper and lower plastic plates, the outside of each sampling hole is covered with veneer, and the inside of each sampling hole is covered with thin film; grit accumulated in wavy form is contained in the rectangular container, a plastic mesh is spread above the grit, the plastic mesh is lapped to the combined plastic plates through lap fasteners. By setting up a river slope and physiochemically analyzing water coverage on the sand slope and by using the experimental apparatus to perform layered sectional sampling on the inside of the sand slope, riverbed evolution in the hyporheic zone riverbed is obtained; by using the reasonably designed experimental apparatus, it is easy to perform field experiments under complex geographic conditions.

Description

technical field [0001] The invention relates to the field of water flow detection, in particular to an experimental device and an experimental method for measuring an underflow zone under the condition of field river bed evolution. Background technique [0002] In natural rivers, the interaction process between surface water and shallow groundwater is called subsurface exchange. This process has an important impact on the survival of benthic organisms, material circulation and energy exchange. At the same time, fine particles such as sediment in surface water , microorganisms, etc. will also enter the interior of the hyporheic zone with the water flow, thereby affecting the composition of the riverbed inside the hyporheic zone. Usually, researchers use indoor circulating tank experiments combined with numerical simulation methods to determine the change form of the riverbed inside the subsurface zone. However, this process often makes many assumptions and cannot fully confor...

AI Technical Summary

Problems solved by technology

Usually, researchers use indoor circulating tank experiments and numerical simulation methods to determine the change of the riverbed inside the subsurface zone. However, this process often makes many assumptions and cannot fully conform to the exchange process in real rivers.

In the prior art, there is no research on the internal evolution process of the subsurface zone in the actual river

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