Method and system for forecasting urban drainage basin flood

Abstract

The invention discloses an urban drainage basin flood prediction method and system. The method comprises the following steps: determining rain pattern space-time distribution of an urban area according to historical data; establishing a flood simulation scene library by simulating parameters of the region under different scenes by using a refined flood model according to the rain pattern spatial and temporal distribution and the river flood boundary conditions; establishing a rainstorm flood relational expression and a waterlogging simulation relational expression based on the simulation data; correcting the obtained forecast rainfall data according to the rainfall pattern spatial and temporal distribution, and dividing different scenes; and performing data matching on the rainstorm flood relational expression, the waterlogging simulation relational expression and different scenes, and when the matching degree is greater than a preset value, taking simulation data in the flood simulation scene library as urban drainage basin flood forecasting information. According to the method, the flood peak flow and the total flood amount of each node in the prediction period, and information such as the ponding point position, the ponding depth and the ponding duration can be rapidly calculated, rapid prediction, research and judgment of urban flood disasters are achieved, and precious time is gained for flood control and drainage emergency management.

Description

technical field [0001] The invention relates to the technical field of hydrological forecasting, in particular to a method and system for forecasting urban watershed floods. Background technique [0002] Flood disasters are one of the most costly natural disasters in the world today. Affected by the urban rain island effect, local short-term heavy rainfall occurs frequently in urban areas, as well as special terrain and underlying surface conditions, coupled with population The superposition of disaster-causing factors such as social and economic factors has greatly increased the risk and uncertainty of urban flood disasters. [0003] Numerical models are an important technical means for urban flood control and disaster reduction. As urban flood models become more refined, simulation elements and parameters are increasingly enriched, model development and monitoring information are highly dense and mismatched, and the redundancy of model algorithms continues to increase. Th...

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Problems solved by technology

[0003] Numerical models are an important technical means for urban flood control and disaster reduction. As urban flood models become more refined, simulation elements and parameters are increasingly enriched, model development and monitoring information are highly dense and mismatched, and the redundancy of model algorithms continues to increase. Due to the natural attributes of large and fast confluence, there is a problem that it takes a long time to forecast, simulate and calculate floods in urban watersheds, and the time reserved for flood control command and decision-making is short

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