A hyperpycnal flow model test method suitable for canyon-type reservoirs

Abstract

The invention relates to a hydraulic model test method, in particular to a differential density flow model test method suitable for canyon-type reservoirs, belonging to the technical field of hydraulic engineering, and its IPC international patent classification number is E02B 1 / 02. In this test method, tracks are set on both sides of the model, and a sampling bridge that can move upstream and downstream along the track is set on the model. A sampling device composed of a sampling tube and a copper tube is integrated on the probe rod on the sampling bridge. The device is connected, and the negative pressure device includes a water ring pump, an air storage tank and a suction pipe. Through the negative pressure device and the sampling pipes installed at different water depths, it is very convenient and timely to sample multiple sections and different water depths, which improves the sampling efficiency and the validity of the sand content samples, and increases the data volume of the test data. The test accuracy is improved, and the work efficiency is significantly improved.

Description

Technical field: [0001] The invention relates to a hydraulic model test method, in particular to a density flow model test method suitable for canyon-type reservoirs, belonging to the technical field of water conservancy engineering, and its IPC international patent classification number is E02B 1 / 02. Background technique: [0002] If two or more fluids are in contact with each other, there is a certain but small difference in the severity. If one of the fluids flows along the direction of the interface, no global mixing phenomenon occurs during the flow. Flow is called density flow. Density flow is a special movement form of sediment-carrying water flow. It usually appears in reservoirs, cecal sections, dug-in river ports and ship lock approach channels, etc., and has an important impact on sediment movement and river bed evolution in these places. The muddy water from the upper reaches of the reservoir dived into the bottom of the reservoir somewhere, and some traveled more th...

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Problems solved by technology

[0005] However, most of the mountainous reservoirs in my country are canyon-type reservoirs, and the slopes in the reservoir area are very steep. After the hydraulic model is abnormally processed, the slopes become steeper. Most of the reservoir sections have slopes above 70°, and some The reservoir section is even close to 90°, which limits the sampling of sediment concentration elements in each section

[0006] Especially during the period when the hyperpycnal flow occurs, there is a water storage body in the reservoir, and the depth of the clear water is relatively large. After the hyperpycnal flow submerges, it runs in the lower layer of the clear water. It is extremely difficult to sample the sediment content elements of each section. The traditional sediment concentration sampling method cannot sample

The difficulty of the density flow test is high, and the time is tight. In many cases, the test cannot be performed or the measurement is not timely, which will seriously affect the accuracy of the density flow test results.

[0007] In order to ensure the sampling accuracy, it is necessary to sample slowly or quickly according to the different flow patterns of the water flow. Sampling the hyperpycnal flow in reservoirs with large water depth and high sediment content greatly increases the workload and difficulty of model tests.

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