An experimental device and method for simulating the development of Goutou drop point

Abstract

The invention discloses an experimental device and method for simulating the development of ditch-head drop holes, which comprise a water tank one, a water tank two and a grit chamber. Tank 1 is located upstream of tank 2, and the outlet of tank 1 is located upstream of the center of tank 2. The upstream of tank 1 is connected to a steady flow pool, and tank 1 is connected to the steady flow pool through water pipes; the downstream of tank 2 is connected to a flow collector There is a sand collecting port at the outlet of the collecting tank, and the sand collecting port is aligned with the grit chamber. The following experimental methods are carried out through the above-mentioned experimental device: adjust the hydrodynamic conditions of the first water tank, fill different soils into the second water tank, and finally use photogrammetry technology to monitor the shape of the water tank after scouring with high precision. The invention effectively simulates the erosion and sediment production process and morphological characteristics of the ditch bed under the action of falling water under different hydrodynamic and ditch bed soil conditions, and realizes a systematic simulation test on the development process of the ditch hole.

Description

technical field [0001] The invention belongs to the technical field of soil and water conservation experiments, and in particular relates to an experimental device and method for simulating the development of ditch heads and pits. Background technique [0002] Gully erosion is the main process of soil erosion, and the contribution of gully erosion to sediment yield in major water erosion areas in my country is as high as 42.9%-86.3%. Erosion at the head of the gully is one of the main processes of the development of gully erosion. The converging stream upstream of the head of the ditch forms falling water at the head of the gully and erodes the bed of the gully, which is the main driving factor for the retreat of the head of the ditch. [0003] The flume test is the main test method to study the soil separation rate under the condition of gust flow erosion. In the early stage, through flume simulation tests in China, the critical development conditions of rills, the separat...

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Problems solved by technology

[0004] There are significant differences between falling water erosion and shearing erosion in terms of scouring angle and action mechanism. The design of the flume experimental device for shearing erosion is relatively mature and has been widely used; in contrast, there are few flume experiments for falling water erosion Reported, there is also a lack of a mature drop tank experimental device

[0005] In addition, there is also a test method for observing the runoff-erosion process and the change process of morphological characteristics on the scale of incision ditch head through the simulated erosion test of in-situ ditch head in the field, but the number of ditch heads available for in-situ tests is relatively limited. It is difficult to control other influencing factors such as upstream water and underlying surface conditions, ditch head shape, soil conditions, etc., making it difficult to accurately simulate the development process of the acupoint itself

[0006] Therefore, compared with shear erosion, due to the limitation of experimental means, the simulation research on the source erosion process of the ditch head with falling water as the dynamic condition is still relatively weak. There is still a lack of systematic research on this aspect, resulting in the current lack of practically applicable gully head trace erosion prediction models in the world, which seriously affects the prevention and control of gully erosion

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