Runoff production mode self-adaptive watershed hydrological forecasting method and system

Abstract

The invention discloses a runoff production mode self-adaptive watershed hydrological forecasting method and system, and belongs to the field of hydrological forecasting in hydrology. The drainage basin runoff production mode distinguishing method based on integration of full storage runoff production, excess infiltration runoff production and mixed runoff production is constructed according to soil moisture content characteristics and rainfall process characteristics in different early stages of a drainage basin; further, according to a dimensionless unit line principle, a dimensionless comprehensive confluence unit line based on small watershed terrain and landform features is derived according to a watershed historical flood process; and a flood peak target, a peak present time target and a deterministic target are taken as evaluation indexes, parameters related to the optimal runoff production mode determined by each sub-basin are optimized and calibrated, and then a complete forecasting system is formed. The optimal infiltration mode of the drainage basin can be determined according to different soil water content characteristics and rainfall characteristics of the drainage basin, the drainage basin confluence unit line is determined according to the landform characteristics of the drainage basin, and the invention has the advantages of being simple in calculation, wide in application range and high in fitting precision.

Description

technical field [0001] The invention belongs to the field of hydrological forecasting in hydrology, and more particularly relates to a watershed hydrological forecasting method and system for self-adaptation of runoff models. Background technique [0002] my country's hydrological forecasting has been greatly developed in the past few decades, and a wealth of experience has been accumulated. A large number of flood forecasting methods have achieved remarkable results. precise situation. The reason is mainly due to the complex underlying surface conditions of small and medium-sized watersheds and the frequent changes in rainfall, resulting in complex and diverse runoff production mechanisms. The traditional single runoff theory cannot analyze the infiltration process at all, and the runoff simulation is based on the simulation of runoff in the basin. In the first step, if the runoff simulation effect is not good, the entire runoff process will basically fail to achieve satisf...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a watershed hydrological forecast method and system with self-adaptive runoff model, the purpose of which is to solve the problems of single runoff method and unanalyzable infiltration mechanism of the watershed in the hydrological forecasting technology. Technical problems, and furthermore, it is impossible to give high-precision forecasts for runoff forecasts in small and medium watersheds

Images