Seasonal design flow computing method for river-type water functional areas

Abstract

The invention provides a seasonal design flow computing method for river-type water functional areas. The seasonal design flow computing method comprises the steps of establishing a distributed hydrological model and simulating and verifying the watershed hydrological processes of the river-type water functional area to be studied, establishing the corresponding relation of each river-type water functional area to be studied to each sub-watershed inside the distributed hydrological model, outputting the long series monthly runoff volume simulation results of each sub-watershed of a section under each river-type water functional area to be studied according to the corresponding relation, selecting the long series runoff volume simulation results of corresponding months of each river-type water functional area to be studied according to the design flow accounting rule of the river-type water functional areas to be studied according to the corresponding relation, ranking and selecting the flow having a certain assurance rate as the design flow of the river-type water functional areas to be studied. The seasonal design flow computing method for the river-type water functional areas is capable of checking the design flow of the water functional areas in each period by selecting different time periods (such as dry season, normal river flow period and flood season), and then capable of supporting delicacy management of the water functional areas.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a calculation method for seasonal design flow of a river-type water function area. Background technique [0002] The control of water environmental pollution has gone through the stages of concentration control and total target control, and has gradually entered the stage of total control of environmental capacity. The water environmental capacity of a river course refers to the total amount of pollutants that can be accommodated to ensure that the function of the water body is not damaged under the specified environmental objectives. Usually, under a given water area, water quality standard and design hydrological conditions, the maximum pollutant holding capacity allowed by the water area is called the maximum environmental capacity of the water area. The amount of pollutants that various water bodies can hold depends on the amount and state of the water body. T...

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Problems solved by technology

[0004] The use of historical measured data to calculate the design flow of water function areas has the following problems: (1) Each water function area needs to be calculated separately, resulting in a large workload in practical work and scientific research; (2) it is completely passed The deduction of measured data is not conducive to the study of the design flow evolution law of water function areas under changing environments; (3) It is difficult to process data in areas with insufficient or no hydrological measured data

Moreover, for river-type water function areas, there are huge differences in the flow process in different hydrological stages, and the pollution sources and pollution loads in the river are also quite different.

Currently, the design flow of water function areas is generally verified by flow in dry seasons (for example, according to the daily flow from December to March of the following year, the flow is arranged from large to small, and the flow rate with a guaranteed rate of 75% is taken as the design flow of water function areas). It can better support the change of pollution load in the water function zone and the fine management of water quality compliance in the year

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