A Solution Method Applied to Design Flood Hydrograph of Small Watershed
A technology for designing floods and process lines, applied in design optimization/simulation, computer-aided design, calculation, etc., can solve problems such as loss of accuracy, low calculation efficiency and accuracy, difficulty in meeting the calculation requirements of flood peak flow, etc., and achieve the effect of improving accuracy
Active Publication Date: 2022-06-07
福建省水土保持工作站
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Problems solved by technology
The design flood calculation method for this watershed is usually the generalized hydrograph method, but few flood hydrographs are triangular. As a simplified method, it is more suitable for small watersheds where the shape of the flood is not particularly important, but the accuracy will be reduced. will be lost
If the basic equation of the instantaneous unit line is used to design the flood process line, and because it is a linear equation, it will be affected by its homogenization, so that the calculated design flood peak discharge is too small, and there is a deviation
In addition, in actual engineering, due to insufficient data, empirical methods or manual calculations are often used to calculate design floods in small watersheds. The calculation efficiency and accuracy are low, and it is difficult to meet the current water and soil conservation production project construction spoil yard design flood peak flow calculation requirements
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[0038] In order to make the objectives, technical solutions and advantages of the present invention more clear, a clear and complete description will be given below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, but not all, embodiments of the present invention.
[0039] like figure 1 As shown, the present invention provides a solution method applied to the design of flood hydrographs in small watersheds, comprising the following steps:
[0040] Step S1, select any small watershed as the small watershed to be calculated, and input parameters through regional data: catchment area F, main channel length L, main channel average slope J, annual maximum 24h average rainstorm Annual maximum 24h design rainstorm modulus coefficient k P , rainstorm decrement index n’, stable infiltration rate μ;
[0041] Step S2, calculate function parameters according to input parameters: design rain for...
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The invention relates to a solution method applied to the design flood process line of a small watershed. Including: input hydrological parameters according to the basin data; carry out regional design rainstorm calculation and confluence calculation; use Newton iterative method to calculate and verify flood peak flow; obtain confluence time and confluence velocity, and use them to test the rationality of the calculation results; The parameters determine the instantaneous unit line of the watershed, and distribute it hourly according to the net rain depth, and solve the design flood peak discharge by the comparative reasoning formula method; calculate the design flood process line according to the non-linear solution technology principle of the instantaneous unit line of the watershed. The invention is suitable for solving the same-frequency and time-history distribution rainfall process of the comprehensive rainfall pattern in a small watershed, and is a method with reasonable design and small error, which can be applied to the calculation of the design flood process line.
Description
technical field [0001] The invention relates to the field of engineering hydrology, in particular to a solution method applied to the design of flood hydrographs in small watersheds. Background technique [0002] Under the combined influence of global climate warming and dynamic changes of the underlying surface of the watershed, the probability of heavy rainstorms will increase and the magnitude of intensity will increase, resulting in more and more serious disasters such as mountain torrents, waterlogging, landslides and debris flows. The dynamic changes of the underlying surface of the watershed, their overall effect and cumulative effect will lead to more serious flash floods, waterlogging, landslides and debris flows caused by the same heavy rain, and the task of preventive measures is heavier. [0003] The small watershed usually refers to the watershed below the secondary and tertiary tributaries and the outlet section of the downstream channel as the boundary with th...
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IPC IPC(8): G06F30/28G06F113/08G06F119/14
CPCG06F30/28G06F2113/08G06F2119/14Y02A10/40
Inventor 邓永良罗毅桦徐玉华张万清徐普
Owner 福建省水土保持工作站