Sand supply instrument for slope-variable water flume

Abstract

The invention relates to a sand supply instrument for a slope-variable water flume. The sand supply instrument comprises lifting platforms, a first water supply tank, a sand supply groove, a sand supply device and a second water supply tank, wherein the lifting platforms comprise a first lifting platform and a second lifting platform; the first lifting platform is higher than the second lifting platform; the height difference between the first lifting platform and the second lifting platform is the vertical height of the sand supply groove; the first water supply tank is horizontally placed on the first lifting platform, and the second water supply tank is horizontally placed on the second lifting platform; the upper end of the sand supply groove is hermetically connected with the water outlet side surface of the first water supply tank; the lower end of the sand supply groove is connected with the water inlet end of the second water supply tank; a cambered transitional belt is arranged at the other end of the second water supply tank; the transitional belt is joined with the slope-variable water flume; the sand supply device is arranged over the sand supply groove and provides test silt required by the sand supply groove for the sand supply groove. The sand supply instrument can be connected with the slope-variable water flume by adjusting the heights of the lifting platforms, sand is added to the sand supply groove through the sand supply device, water flow containing sand is generated in the sand supply groove, and the water flow falls on the slope-variable water flume through the water supply tank. Thus, the sand content of the water flow can be well controlled, and the purpose of controlling the sand content of the water flow is achieved.

Description

technical field [0001] The invention belongs to the field of manufacturing and improving water conservancy instruments, in particular to a sand supplying instrument for variable-slope water tanks for improving the accuracy and controllability of indoor hydraulic experiments. Background technique [0002] my country is one of the countries with the most serious soil erosion in the world, and the hazards of soil erosion are serious. Soil erosion directly affects the development, utilization and protection of water and soil resources. Water and soil resources are the most basic conditions for human survival. The area of ​​wind erosion is the largest in my country, followed by water erosion, but as far as the impact on the national economy is concerned, the harm of water erosion is generally greater than that of wind erosion. [0003] The main exogenous force of hydraulic erosion is the slope flow formed by rainfall. The slope flow affects the separation, transportation, and de...

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Problems solved by technology

However, the above method not only has a great impact on the hydraulic properties of very shallow slope flow, but also because the depth of slope flow is shallow, the sediment particles falling in the vertical direction are easy to form accumulations at the landing place, changing the properties of the flume bed surface

In some slope sand flow tests, there are still defects in the control of sand content, which has the following adverse effects: 1. Falling sand particles will change the hydraulic properties of water flow and increase water flow turbulence; 2. Vertically falling mud The sand falls onto the bed surface, and sedimentation may occur, changing the properties of the bed surface

The above adverse effects may greatly affect the experimental results

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