A Prediction Method of Karman Vortex Street Occurrence at the Tail End of Submerged Vegetation Groups in a Channel
A prediction method and vegetation technology, applied in the field of hydraulics and river dynamics, to achieve wide versatility, improve test efficiency, and improve the accuracy of discrimination
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Embodiment 1
[0037] In this embodiment, the identification index for the occurrence of Karman vortex street at the tail end of the submerged vegetation group in the river channel is determined through the flume simulation experiment for specific illustration.
[0038] ①Test purpose
[0039] The movement process of the vortex at the tail end of the submerged vegetation group was recorded by the flume test, and whether Karman vortex street occurred at the end of the submerged vegetation group was judged, and whether the Karman vortex street occurred in each group of working conditions was further tested by flow velocity spectrum analysis. Summarize the experimental results obtained, and put forward the discriminant index for the occurrence of Karman vortex street at the tail end of submerged high-density vegetation group.
[0040] ② Test equipment
[0041] The main equipment is shown in Table 1 below.
[0042] Table 1 Instruments and equipment used in dyeing agent test and flow rate measur...
Embodiment 2
[0077] In order to further test the practicability of the discriminant and predictive method for Karman vortex street occurrence at the tail end of high-density submerged vegetation groups, two groups of field experiments on natural rivers were carried out.
[0078] The test was carried out in the variable backwater area upstream of the Zipingpu Hydropower Station in Dujiangyan City, Sichuan Province. This area was submerged when the water was stored, and most of it was exposed when the water was discharged. There is sufficient sunlight and water, and the vegetation grows rapidly. The test was carried out when the reservoir was releasing water (the flow velocity of the water body was 14-17cm / s). At this time, there was only one main channel with a width of about 2m and a water depth of about 30cm. Some vegetation groups grew in the main channel. Two of the vegetation groups were selected for the experiment. First, the diameter (d) of a single plant in the vegetation group was m...
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