River plane two-dimension current model roughness calibration method

A water flow model and plane two technology, applied in the field of river dynamics research, can solve problems such as strong subjectivity, unclear flow, harsh conditions, etc., and achieve the effects of reducing human interference, improving calibration efficiency, and reasonable roughness values

Active Publication Date: 2017-09-08
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +2
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Problems solved by technology

However, the above three types of methods have shortcomings such as unclear procedures, harsh conditions, and difficulty in application. At present, there is no empirical or theoretical formula that can directly calculate the roughness distribution of a plane two-dimensional bed surface, and because the previous iterative trial calculation process mainly relied on Manual intervention has no rules and is highly subjective. Even if the same model is used to deal with the same river section, the roughness ratio obtained by different personnel is also very different.

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  • River plane two-dimension current model roughness calibration method
  • River plane two-dimension current model roughness calibration method
  • River plane two-dimension current model roughness calibration method

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Embodiment Construction

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0020] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings, as figure 1 Shown is a schematic flow chart of the method for calibrating the roughness of the two-dimensional water flow model of the river channel provided by the embodiment of the present invention, and the method includes:

[0021] Step 1: Delineate roughness partitions according to the characteristics of the rive...

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Abstract

The invention discloses a river plane two-dimension current model roughness calibration method comprising the following steps: 1, delimiting roughness zones according to river plane features, and initializing the roughness in each zone; selecting the present flow rate with to-be-calibrated roughness and the corresponding river reach outlet water level; using a river plane two-dimension current mathematics model to carry out water-power calculation; determining errors between a model calculated value and an actual measurement value of each monitoring point water level; determining whether the water level error is small enough or not; determining a water pass area according to the water depth, and using all monitoring point water level error interpolation to estimate the water level errors between all grid points in the water pass area; using a dichotomy to adjust the roughness of the grid points in the water pass area according to the water level errors of all grid points in the water pass area; further determining whether all to-be-calibrated flow rates have been calibrated or not; if yes, finishing roughness calibration, and storing the roughness calibration result. The method can reduce artificial interferences in an iteration trial process, thus solving the problems that an existing method is unclear in technical process, rigid in conditions, and hard to apply.

Description

technical field [0001] The invention relates to the technical field of river dynamics research, in particular to a method for calibrating the roughness of a two-dimensional water flow model on a river plane. Background technique [0002] Roughness is an important parameter of the two-dimensional water flow mathematical model of the river channel (hereinafter referred to as "two-dimensional water flow model"). The two-dimensional water flow model can be used to calculate the flow velocity, water level and water depth of natural rivers. The acquisition of these hydraulic elements can be Provide hydraulic conditions to solve water conservancy, ecological and environmental issues. The realization of the two-dimensional water flow model on the computer is called "the two-dimensional water flow mathematical model software of the river channel". The essence of the calculation process is the process of solving the discrete two-dimensional shallow water equation. In addition, releva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 关见朝曹文洪戴春胜方春明毛继新鲁文于宁刘春晶刘磊温州刘卉芳祁伟倪晋曹越郭佳乐宋佳丽张磊王大宇段逆
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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