MIKE21 and blind number theory-based rain source type river water environment capacity calculation method

Abstract

The invention provides an MIKE21 and blind number theory-based rain source type river water environment capacity calculation method. The method comprises the following steps: 1) constructing a targetriver MIKE21 hydrodynamic water environment mathematical model according to basic data and performing calibration; 2) dividing the target river into a plurality of unit river sections according to thedistribution of each river branch of the target river, extracting flow, flow velocity and water quality simulation data results of the target river main stream and each river branch based on a mathematical model, and determining a corresponding blind number form; and 3) according to the water environment capacity calculation model of the rain source type river, respectively calculating the waterenvironment capacity value of each unit river reach based on blind number operation and a blind number mean value, and determining the water environment capacity values of each unit river reach of thetarget river and the whole river. According to the method, the uncertainty of various parameters in the target river water environment system is fully considered, the calculation is relatively simpleand convenient, the credibility of the calculation result is relatively high, and the water environment conditions of each unit reach of the rain source type river and the whole river can be scientifically and accurately evaluated.

Description

technical field [0001] The invention belongs to the field of water environment management, and in particular relates to a method for calculating the water environment capacity of a rain source type river based on MIKE21 and blind number theory. [0002] technical background [0003] With the rapid development of social economy and the intensification of human activities, our country is facing severe water environment problems, the aggravation of water pollution, and the increasingly prominent water quality-type water shortages have made our country's water resource shortage situation more severe. The harmonious relationship between human beings and water balance is gradually broken, water bodies are degraded, water quality is polluted, river courses are channelized, and the aquatic ecological environment is gradually declining. Among them, the flood disaster and water quality pollution problems of urban rain-source rivers are particularly serious, especially water quality prob...

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Problems solved by technology

[0005] At present, the flow of sewage discharged into the river is generally ignored in the calculation of the environmental capacity of the river by using the mathematical method of uncertainty, that is, the flow of the upstream and downstream of the calculated river section is considered to be the same. On this basis, the river section is divided into multiple calculations. The water environment capacity value of each section is calculated separately. Compared with ordinary rivers, the base flow of rain-source rivers is relatively small, while rain-source rivers usually have a large amount of sewage, and the discharge flow into the river cannot be ignored. Rain source rivers are mostly distributed in cities, so there is a need for a water environment capacity calculation method suitable for rain source rivers

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