TRIC runoff index early warning method based on distributed TIN units

Abstract

The invention discloses a TRIC runoff index early warning method based on distributed TIN units, and relates to the field of hydrologic early warning. The method includes the steps that on the basis of a distributed hydrologic model, a TIN grid of a to-be-studied basin is generated with a boundary layer of the to-be-studied basin as the outer boundary and a river network layer of the to-be-studiedbasin as the inner boundary; in combination with historical rainfall data of the to-be-studied basin, the accumulated maximum upstream water amount of multi-year average time periods of each grid unit in the TIN grid is calculated, and then the early warning index (with the symbol shown in the description) of an arbitrary grid unit i in the to-be-studied basin is calculated; the runoff index (with the symbol shown in the description) and the upstream water amount (with the symbol shown in the description) of each grid unit are calculated; the early warning index (with the symbol shown in thedescription) of each grid unit is calculated, when the early warning index (with the symbol shown in the description) is larger than or equal to 1, early warning is started from the grid unit i, and when the early warning index (with the symbol shown in the description) is smaller than 1, early warning is stopped from the grid unit i. By means of the method, an early warning result closer to actual conditions and higher in early warning accuracy is obtained based on few topographic materials; besides, the method is higher in adaptability.

Description

technical field [0001] The invention relates to the field of hydrological early warning, in particular to a TRIC runoff index early warning method based on distributed TIN units. Background technique [0002] In semi-humid and semi-arid areas, there are many flash flood disasters caused by the uneven distribution of rainfall in time and space. Therefore, building distributed early warning indicators for such areas is the key to realizing distributed early warning. The following describes the deficiencies in the existing distributed early warning: [0003] 1. Dynamic critical rainfall commonly used in China [0004] Although the dynamic critical rainfall is determined on the basis of statistical analysis of rainfall and flood data. However, critical rainfall needs to be considered comprehensively in terms of hydrological characteristics, climatic conditions, geological landforms, vegetation and soil conditions in practical applications. [0005] The FFG method that is popu...

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Problems solved by technology

[0012] The purpose of the present invention is to provide a TRIC runoff index early warning method based on distributed TIN units, so as to solve the problems of low accuracy of the precipitation early warning value and high early warning cost when the existing method is used to forecast precipitation in semi-humid and semi-arid areas

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