Method for simulating flood routing by solving Saint-Venant equations through channel storage increment relationship

Abstract

The invention relates to a method for simulating flood routing by solving Saint-Venant equations through a channel storage increment relationship, which comprises the following steps of: simplifying Saint-Venant basic simultaneous differential equations into a water balance equation and dynamic equations in delta t time interval, and respectively calculating the channel storage increment of a reach according to the water balance equation and the dynamic equations, namely calculating the channel storage increment according to the water balance equation and calculating the channel storage increment according to two dynamic equations at the beginning of and at the end of the time interval. The channel storage increments of the reach calculated by the two methods are equal, so a new and reliable method is provided for simulating the flood routing by solving the Saint-Venant equations by a hydraulic method and plays an important role in the aspects of reasonable determination of flood control project scale, flood forecasting, scientific flood dispatching and the like in river channels, channels, flood diversion and storage areas and reservoirs.

Description

technical field [0001] The invention relates to the scientific and technical field of flood control and disaster reduction, in particular to a method for simulating flood evolution by solving St. Venant's equations according to the relationship between the water balance equation and the storage increment of the dynamic equation. Background technique [0002] my country is a country where floods occur frequently. 1 / 2 of the country's population, 1 / 3 of the arable land and major cities are below the flood level of rivers. The industrial and agricultural output value of areas threatened by floods accounts for 2 / 3 of the country. In order to achieve the purpose of mitigating flood disasters and using water resources to serve national economic and social development, a mathematical model for simulating flood evolution is established, and the scale of flood control projects, flood forecasting, and scientific flood dispatching are reasonably determined in river courses, channels, fl...

AI Technical Summary

Problems solved by technology

The disadvantages are: ① the generalization is relatively rough, and it is difficult to analyze the complex flow regime and main characteristics in the river channel in detail; ② it is difficult to provide the time and space distribution of the water level in the river section and dynamically simulate the evolution process of the flood in the river section

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