A method for estimating the average free water storage capacity of a watershed by flow hydrographs

Abstract

The invention discloses a method for estimating drainage basin average free water storage capacity through flow hydrograph. The method comprises the steps of dividing a session flood in actual measurement flow data of a drainage basin outlet station; dividing a surface runoff, an interflow and a groundwater runoff on the session flood hydrograph, calculating runoff depths of the surface runoff, the interflow and the groundwater runoff and obtaining the total runoff depth; calculating the net rainfall depth of the session flood; calculating a free water storage reservoir full storage area proportion in full storage runoff generation; calculating an outflow coefficient of the interflow through combination of a linear constraint relation between the outflow coefficients of the interflow and the groundwater runoff according to a proportional relation among the runoff depths of the surface runoff, the interflow and the groundwater runoff; and carrying out estimation to obtain a value of the drainage basin average free water storage capacity according to the outflow coefficient of the interflow and the free water storage reservoir full storage area proportion in full storage runoff generation. According to the method, the number of the parameters needing to be set is reduced, and the probability that same effect of different parameters occurs is reduced.

Description

technical field [0001] The invention relates to a method for estimating the average free water storage capacity of a river basin through flow process lines, and belongs to the technical field of hydrological analysis. Background technique [0002] In the early 1980s, a research group led by Professor Zhao Renjun of Hohai University proposed the Xin'an River model with two water sources. In the mid-1980s, the concept of free water storage reservoirs in hillside hydrology was introduced, and the Xin'anjiang model of three water sources was proposed, using free water storage reservoirs to divide runoff into surface, soil and underground runoff. This makes the capacity (SM) of the free water storage reservoir determine the proportion of runoff components. If SM is large, there will be more midflow and underground runoff, slower confluence and retreat, and the calculated runoff hydrograph at the outlet of the basin will be shorter If the SM is smaller, the surface water runoff w...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a method for estimating the average free water storage capacity of the watershed through the flow process line, and solve the problem of various model parameter calibrations in the construction of the Xin'anjiang model in the existing method question

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