Runoff Simulation Prediction Method

A prediction method and technology of runoff, applied in the measurement of flow/mass flow, liquid/fluid solid measurement, measuring devices, etc., can solve the problems of large system error, insufficient abundance and diversification, etc., to improve the accuracy of runoff and runoff. Good simulation effect and the effect of reducing errors

Inactive Publication Date: 2011-12-21
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Problems solved by technology

However, the data and data are not rich enough and diverse enough. Due to the great difference between my country's natural climate conditions and Europe, North America and other countries, the rainfall has strong seasonal characteristics. Especially in most northern regions of my country, the rainfall in the flood season accounts for the total annual rainfall 70% of the total rainfall, and most of them appear in the form of concentrated rainstorms, which is different from the relatively uniform distribution of rainfall in some countries such as Europe and North America. Directly using the SCS model for calculation will result in large systematic errors

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  • Runoff Simulation Prediction Method

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Embodiment Construction

[0023] The SCS runoff model is a small watershed hydrological forecast model proposed by the Soil Conservation Service (SCS) of the US Department of Agriculture, which reflects the impact of different soil types, different land use patterns, and previous soil moisture content on rainfall runoff. The calibration is relatively easy, the structure is simple, and the use is relatively convenient. Its basic flow equation,

[0024] Q = ( P - I a ) 2 P - I a + S - - - ( 1 )

[0025] In the formula: P is the rainfall (mm); Q is the runoff caused by rainfall (mm); Ia is the initial...

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Abstract

The invention discloses a method for simulating and predicting runoff, which includes: selecting bare land and at least one experimental area, measuring the runoff of the bare land and the experimental area in different time periods; The fitting error between the obtained secondary runoff and the secondary runoff obtained by the simulation calculation is the minimum, and the change of the runoff curve value CN corresponding to different land use types is obtained. The runoff model is associated with the runoff curve value CN; according to the runoff The change of the curve value CN, with the goal of minimizing the fitting error between the measured total runoff and the simulated total runoff, is to obtain the CN average value corresponding to different land use types; according to the secondary runoff simulated calculation error brought by the CN average value, A correction coefficient k is obtained, and the simulated calculation value of the secondary runoff volume is corrected according to the correction coefficient k. The invention has the characteristics of good runoff simulation effect.

Description

technical field [0001] The invention relates to a hydrological prediction technology, in particular to a method for simulating and predicting runoff. Background technique [0002] Calculation of watershed runoff is an important basis for the study of many hydrological and water resources issues, and is also the basic content of agricultural non-point source pollution research. Quantitative estimation of rainfall-runoff under different land use conditions is useful for studying the law of soil erosion and non-point source pollution. The law of pollutant migration and the evaluation of rational utilization of water and land resources are of great significance and practical value. [0003] At present, the relatively mature farmland and small watershed-scale rainfall-runoff models use the SCS model proposed by the US Soil and Water Conservation Service to calculate the surface runoff generated by rainfall, which has been effectively verified and widely used in North America and ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/00
Inventor 王少丽许迪焦平金韩松俊陈皓锐
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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