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Runoff predicting method

A forecasting method and runoff technology, applied in forecasting, instrumentation, data processing applications, etc., can solve problems such as limiting accuracy, and achieve the effect of clear parameter physics concept

Inactive Publication Date: 2013-06-12
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Description
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Problems solved by technology

However, since the SCS model only defines the impact of previous rainfall as three specific conditions from an average point of view, it limits the improvement of the accuracy of these methods

Method used

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Embodiment

[0019] Taking a certain area in Huaibei as the application area of ​​the present invention, the method of the present invention is used to predict the farmland track flow under the growth of wheat-bare land, wheat-corn and wheat-soybean in this area. The steps of the method of the present invention are as follows:

[0020] Step S1: Establish a rainfall runoff model.

[0021] The establishment process of the rainfall runoff model of the present invention is as follows:

[0022] It is assumed that all runoff processes occur under the condition of relatively dry soil (no rainfall for a long time), and the initial loss value under this condition is defined as I d . Under this condition, the water balance equation and the assumption equation of equal proportions can be expressed as:

[0023] P=I d +F+Q (1);

[0024] Q P - I d = F ...

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Abstract

The invention discloses a runoff predicting method. The method comprises the following steps of: establishing a rainfall runoff yield model; carrying out parameter calibration on the rainfall runoff yield model by adopting rainfall and runoff data of farmland or a region obtained through observation, and determining a runoff yield influence coefficient K of antecedent rainfall and a rainfall initial loss value Id under the condition that no antecedent rainfall exists for a long time; and acquiring the daily rainfall P of a current day and the actual daily rainfall Pi of an antecedent i-th day of the farmland or region, and obtaining surface runoff Q according to the rainfall runoff yield model. The method disclosed by the invention has the advantages that higher surface runoff prediction accuracy is obtained while less monitored data are adopted.

Description

technical field [0001] The invention relates to hydrological prediction technology, in particular to a runoff prediction method. Background technique [0002] Runoff calculation is of great significance for forecasting crop waterlogging disasters and formulating flood control and disaster mitigation measures, and it is also the basis for quantifying and predicting agricultural non-point source pollution. Accurate calculation of rainfall and runoff is the key to formulate management measures to deal with drought, flood and water and fertilizer loss. At present, the models used to predict the relationship between farmland and watershed rainfall and runoff are mainly organic and rational lumped models and conceptual models. The former is difficult to apply in areas with less monitoring data due to its complexity. The conceptual model represented by the SCS model proposed by the US Department of Agriculture's Soil and Water Conservation Service is widely used because it require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q50/02
Inventor 焦平金许迪王少丽
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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