An urban waterlogging risk assessment method considering the impact of tidal river water level jacking

Abstract

The invention provides a risk assessment method for city waterlogging taking water level jacking influence of tidal rivers. The method comprises following steps: determining probabilities of simultaneous distribution between rainstorms-tidal river water levels, determining a hydraulic computation grid of a hydrology-drainage system for analyses of city waterlogging risks, creating a coupling model of a hydrology-drainage system to calculate a waterlogging parameter h in the grid, creating a waterlogging risk analyzing map taking water level jacking influence of tidal rivers, covering probability density of simultaneous distribution to a hydraulic grid of the hydrology-drainage system, connecting same waterlogging parmaters h to the isoline Lh; and calculating different occurrence probabilities of h0 to obtain city waterlogging parameter values in different recurrence intervals. The risk assessment method for city waterlogging taking water level jacking influence of tidal rivers has following beneficial effects: rainstorms and high water levels of tidal rivers can be imitated within the extreme value range so that low dependence is on hydrologic hydraulic historical data, thereby enhancing engineering practicability; and only by calculating the combined scene between a specific hydrology-drainage system and the hydraulic grid, coupling events of rainfall and tidal river water levels are not needed to be imitated so that assessment efficiency is greatly increased.

Description

technical field [0001] The invention relates to the fields of drainage engineering and urban waterlogging prevention and control. Background technique [0002] In recent years, torrential rain and waterlogging disasters have emerged in large and medium-sized cities in my country, showing the characteristics of generality, clusters, and continuous frequency, which have seriously affected urban operations, residents' lives, and economic development. For example, the "July 21" torrential rainstorm in Beijing in 2012 caused 79 deaths, 163 immovable cultural relics were damaged to varying degrees, 10,660 houses collapsed, and the direct economic loss was as high as 11.64 billion yuan. It can be seen that rainstorm and waterlogging disasters have seriously threatened urban public safety and restricted urban sustainable development. [0003] Urban rainstorm and waterlogging disasters are related to many factors, such as increased rainfall, frequent occurrence of extreme rainstorms...

AI Technical Summary

Problems solved by technology

This method is relatively simple, but it cannot reflect the real relationship between the drainage system and the water level of the Chaohe River, and it is easy to seriously underestimate the risk of urban waterlogging, resulting in failure of the control decision-making plan

In summary, although the potential impact of drainage system-Tide River water level jacking on urban waterlogging has been frequently reported, there is still a lack of technical methods to effectively take the impact of jacking into urban waterlogging risk assessment

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