Underwater sand collector for physical river model

Abstract

The invention relates to an underwater sand collector for a physical river model. The underwater sand collector comprises a sand collection cabin and a cover plate. The sand collection cabin is shaped like a rectangular box with an opening in the top surface, the cover plate is arranged on the top surface of the sand collection cabin and comprises a fixed cover plate and a sliding cover plate arranged under the fixed cover plate, the sliding cover plate is shorter than the fixed cover plate, and the fixed cover plate and the sliding cover plate are provided with a plurality of corresponding strip holes for leaking sand into the model. The invention has the beneficial effects that: the underwater sand collector has a simple structure and can be used conveniently, the problem of underwater sand collection of the physical river model can be fully solved, the accuracy of testing data can be improved, the reliability of testing results can be enhanced, and the underwater sand collector has good application prospects.

Description

technical field [0001] The invention relates to the field of water conservancy science and technology, in particular to an underwater sand collector for a physical model of river engineering. Background technique [0002] The physical model of river engineering is mainly used to predict the movement of water and sediment and the evolution of riverbed. In the study of key technical issues such as waterway regulation, land reclamation, and reservoir and wharf construction, the plane layout, implementation effect, and construction sequence of major water conservancy projects, the physical model of river engineering is currently the most commonly used and most reliable research method. The study of sediment transport laws on the underwater bed surface is an important issue often involved in river engineering physical model tests. The fixed bed sediment transport test is generally used. In the fixed bed sediment transport test, the collection of underwater model sand is an import...

AI Technical Summary

Problems solved by technology

[0004] (1) The open sand collection box is easy to form a large-scale vertical vortex under the action of the model water flow. The shallower the sand collection box depth, the smaller the vortex scale and the greater the vortex strength. After the sediment enters, it is easy to be lifted by the tumbling water flow Jumping out of the sand collection box, the sand collection effect is not ideal; due to the partial cover plate on the top of the semi-open sand collection box, although there is a vertical vortex in the open part, the water flow under the cover plate is relatively stable, and the sand collection effect is slightly improved. but still not ideal

[0005] (2) Due to the large open area and depth (compared with the model scale), the two types of sand collection boxes will have a "pit digging effect" during the model test, which will greatly interfere with the flow field nearby, thus affecting the test accuracy , in severe cases, it may change the distribution of local sediment, resulting in unreliable test results

[0006] (3) Both of the above two sand collection boxes cannot achieve selective sand collection (it is a passive sand collection method, and the sand collection time cannot be controlled). In the model test, as long as the moving sediment passes over it, it may be collected. This kind of sand collection method is acceptable for simply measuring the quality and quantity of movement, but it is not ideal for studying the distribution of sediment, because the arrangement of a large number of sand collection boxes (equivalent to digging many huge pits in nature) will affect or even hinder the natural sediment. The repetition of the sand distribution law on the model will eventually lead to distortion of the model test results

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