Method for simulating influence of flood discharge nappe on riverway and mound forms
A technology of river channels and floods, applied in the field of high dam discharge engineering simulation, which can solve the problems of not paying too much attention, narrow mounds, narrow river valleys, etc.
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Embodiment 1
[0034] see figure 1 , a method for simulating the influence of flood discharge tongues on the shape of river channels and mounds, comprising the following steps;
[0035] S1. Select dynamic bed simulation particles according to the anti-scour flow velocity of the channel bedrock, determine the model scale of the channel, and then calculate the anti-scour velocity of the channel model according to the anti-scour velocity of the channel bedrock according to the channel model scale λ;
[0036] S2, according to the anti-scouring velocity of the channel model obtained in S1, calculate the particle size of the model bulk material, and pile up the selected moving bed simulation particles of the corresponding particle size into the channel model;
[0037] S3. Simulate the flood discharge tongue according to the anti-scour flow rate of the river channel model, and then use the simulated water tongue to perform a dynamic bed scour test on the channel model established in S2 to form a sc...
Embodiment 2
[0043] Based on Example 1 but with some differences;
[0044] The simulation experiments mentioned in S1-S5 used the Fr similarity criterion to simulate the flood discharge tongue, the simulated river water level and the river topography. The established model was a normal model, and the scale of the river model was not less than 1:100. The width of the model is not less than 1m.
[0045] The length of the simulated range of the river channel model is not less than 10 times the channel width, the upstream channel length of the water drop point of the simulated water tongue is not less than 6 times the channel width, and the downstream channel simulation length of the water drop point of the simulated water tongue is not less than 4 times the channel width width.
[0046] The anti-scouring velocity of the channel model mentioned in the S1 and the particle size of the model bulk material mentioned in the S2 are determined by the following empirical formula:
[0047]
[0048...
Embodiment 3
[0051] Based on Example 1 and 2 but different:
[0052] For the scouring simulation experiments described in S3 and S5, the scouring time shall not be less than hours, where λ is the model scale.
[0053] The surrogate simulated particles mentioned in S4 are calculated using the Shamov empirical formula:
[0054] V K =4.6(λd) 1 / 3 h 1 / 6
[0055] In the formula: d is the model particle size (m), h is the water depth (m), V K is the prototype anti-shock velocity (m / s), and λ is the model scale.
[0056] The present invention proposes to simulate the shape of the mound behind the scouring pit. Since the water flow turbulence in the area where the mound is formed is relatively small, the shape of the mound is mainly determined by the transport capacity of the water flow to the particles. Therefore, the shape simulation of the mound should be guaranteed. On the basis of the topography of the scour pit, replace the particles of the mound topography with another gradation of sim...
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