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Overbank flow floodplain and channel excess flow computing method

A calculation method and over-flow technology, applied in water conservancy projects, complex mathematical operations, water conservancy engineering equipment, etc., can solve problems such as difficult to reflect changes in cross-section transverse flow velocity, errors, and roughness, and achieve the effect of ensuring sustainable social and economic development.

Inactive Publication Date: 2017-01-11
HOHAI UNIV
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Problems solved by technology

Most of the existing methods for determining the beach-trough flow split ratio use the beach-trough segmentation method to obtain the average flow velocity of the beach and the trough separately, and then calculate the cross flow of the beach and the trough by calculating the area. This method is relatively rough and difficult to reflect the cross-section The effect of changes in flow velocity can sometimes lead to erroneous results, especially during floodplains

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  • Overbank flow floodplain and channel excess flow computing method
  • Overbank flow floodplain and channel excess flow computing method
  • Overbank flow floodplain and channel excess flow computing method

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Embodiment Construction

[0030] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0031] Based on the mathematical model of depth average water flow, the present invention solves the average water depth flow velocity at each point of the compound section, and solves the overflow flow of the beach and the trough through the horizontal integration, and then uses this method to compare and analyze the main elements that may affect the split ratio of the beach and trough, Select the elements with the greatest influence, and construct the formula for calculating the overflow of the beach channel. When the cross-section conditions of the channel are constant, according to the predicted cross-section discharge, the flow over the shoal and trough can be quick...

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Abstract

The invention discloses an overbank flow floodplain and channel excess flow computing method. According to the method, a computing formula of floodplain and main channel excess flow is built, and the floodplain and channel excess flow ratio in the computing formula is closely related to the water depth ratio, the width ratio and the roughness factor ratio. In order to determine a mutual relation, a compound section transverse distribution flow mathematical model is adopted for computing the floodplain and channel excess flow under different conditions, the relational expression between the floodplain and channel excess flow ratio and the water depth ratio, the relational expression between the floodplain and channel excess flow ratio and the width ratio, and the relational expression between the floodplain and channel excess flow ratio and the roughness factor ratio are obtained through analysis, and finally the overbank flow floodplain and channel excess flow is comprehensively obtained through the computing method. According to the computing method, when fluvial cross section conditions are certain, the floodplain and channel excess flow can be rapidly obtained according to the forecast cross section flow, and a basis is provided for planning and utilization of floodplain and water resources.

Description

technical field [0001] The invention relates to a calculation method for overflow of floodplain water flow and trough, in particular to a calculation method for overflow of river floodplain and main trough after flood floodplain, and belongs to the technical field of flood control and river channel management in the discipline of water conservancy. Background technique [0002] A compound cross-section channel refers to a channel with a floodplain and a main channel, and this type of channel exists in large quantities in nature. Most of the rivers in northern my country are sandy rivers with high sediment content. They often have the characteristics of less water and more sand, and uneven distribution of water and sediment in a year. In recent years, with the rapid economic growth, people's demand for land and water resources has gradually increased, and the planning and utilization of beach land and water resources is particularly important. However, the flow during the fl...

Claims

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Application Information

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IPC IPC(8): E02B1/00G06F17/10
CPCE02B1/00G06F17/10
Inventor 秦杰吴腾李秀霞
Owner HOHAI UNIV
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