Flood forecasting method based on water level sample

Abstract

The invention relates to a flood forecasting method based on a water level sample. The flood forecasting method is characterized by comprising the following steps of S01: simulating a runoff formation process by adopting a water tank mode, and abstracting the process of converting rainfall into runoff into a relation between the water storage and the outflow of a drainage basin; S02: establishing a function relation between the flow and the water level, performing function fitting on the water level and the average velocity of the cross section first by adopting a zero-crossing power function, and then establishing a relation between the water level of the cross section and the flow; S03: obtaining a relation between the rainfall capacity and the outflow water level; S04: continuously improving the accuracy of a hydrological model by comparing an obtained outflow water level process with an actually measured water level value and adjusting parameters of the hydrological model; S05: inputting the rainfall capacity and the surface evaporation quantity of the upstream drainage basin by aiming at the calibrated hydrological model, so as to obtain the downstream outlet water level process, judging whether a forecasting area is flooded according to a water level peak value, and analyzing the lag time between a rainfall peak and a flood peak according to existing water level rainfall data, so as to determine the peak time.

Description

technical field [0001] The invention relates to the field of water conservancy disaster prevention and mitigation, in particular to a flood forecast method based on water level samples. Background technique [0002] Flood prediction has always been one of the difficult problems in the field of water conservancy disaster prevention and mitigation. For large rivers, there are often abundant hydrological and hydraulic data. At the same time, a large number of water conservancy experts conduct research on these local hydrological and hydraulic data, and then predict the flood of the river. , to provide certain data support for local flood control measures, but in the face of small and medium-sized rivers distributed in mountainous areas all over the country, there are often not enough manpower and material resources and effective methods to support their flood forecasting. [0003] Flash floods refer to surge floods that occur in mountain streams and ditches. Global climate ch...

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Problems solved by technology

[0013] Moreover, the flow rate can only indicate the amount of water in the section of the river, but not the level of the water level.

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