Elastic evaluation method considering influence duration of system performance and water flow velocity

Abstract

The invention discloses an elastic evaluation method considering the influence duration of system performance and the water flow velocity. The method comprises the following steps: constructing an urban flood one-dimensional and two-dimensional coupling model and dividing grid units; simulating to obtain surface submerging water depth and water flow velocity of each grid unit in each time period corresponding to the rainfall sequence; dividing the land utilization type of each grid unit; determining the system performance of the grid unit of which the land utilization type belongs to the non-traffic land in each time period; determining the system performance of the grid unit of which the land utilization type belongs to the traffic land in each time period; determining the influence duration of the system performance of each grid unit; and improving a grid-based elasticity evaluation method, and determining the time period average elasticity of each grid unit. According to the method, the flood disaster resistance, adaptation and recovery capabilities of an urban system are reflected, so that the urban flood disaster risk zoning is better realized.

Description

technical field [0001] The invention relates to the technical field of urban flood disaster risk assessment, in particular to an elastic assessment method that considers the impact duration of system performance and water flow velocity. Background technique [0002] Since the 21st century, the disaster risk caused by climate change and its occurrence frequency have been increasing continuously. The rain island effect and heat island effect brought about by urbanization have further exacerbated the change of the original hydrological cycle of the natural system, and increased the hydrological process of the regional system. The uncertainty of short-duration heavy rain increases in intensity and frequency. Flood disasters are frequent in my country. In order to better deal with the adverse effects of extreme hydrological events such as floods, my country proposes to build sponge cities and resilient cities. Based on this, the resilience of cities in the face of flood disaster...

AI Technical Summary

Problems solved by technology

However, the current grid-based resilience assessment method only considers the degree of system performance change, and only considers the impact of surface inundation water depth in the process of assessing quantitative resilience, ignoring the influence of system performance impact time and water flow velocity on flood resilience. When determining the water depth threshold for performance changes, it is necessary to consider the status of buildings, trees, grasslands, crops, etc. in the study area, which has certain subjectivity and regional characteristics

In addition, there are relatively few relevant studies on resilience at home and abroad, and the role of resilience in flood disaster risk and the relationship between the two are one of the directions that need to be further explored in the future.

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