A Method for Analyzing Disaster Reduction Effects of Different Underlying Surfaces in a City

Abstract

The invention discloses a method for analyzing the disaster reduction effect of different underlying surfaces in cities. Step 1. Using a two-dimensional hydrodynamic numerical model to simulate the evolution process of waterlogging under heavy rain situations with different recurrence periods, and analyzing the distribution of waterlogging risks under the current urban conditions , to build a calculation model for storm waterlogging; step 2, according to the current urban land use, select at least several drainage measures for the underlying surface, including permeable pavement, horizontal green space and concave green space layout, grass planting ditch layout, and roof greening, and analyze their elasticity Anti-waterlogging effect; step 3, analyze the combined anti-waterlogging effect of different underlying surface measures; step 4, conduct a cost-benefit comparative analysis of different underlying surface waterlogging schemes. The invention considers different types of underlying surfaces on the basis of high-precision terrain, establishes a refined model, and reliably simulates rainstorm and waterlogging.

Description

technical field [0001] The invention relates to the technical field of urban emergency disaster prevention analysis, in particular to a method for analyzing the ability of urban multi-type combined underlying surfaces to resist flooding and reduce disasters. Background technique [0002] Domestic and foreign studies on the impact of urban underlying surface changes on waterlogging risk mainly include Best Management Practices (BMP), Low Impact Development (LID), Sustainable Urban Drainage Systems (SUDS), Urban Design for Water Sensitive Areas (WSUD), low In addition to a series of theories and measures such as Influencing Urban Design and Development (LIUDD), research on the impact of surface changes on waterlogging risk includes a comparative analysis of the current situation and the difference in drainage system load after the implementation of stormwater control measures on the underlying surface; The area plans to adopt a single underlying surface treatment measure, and ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are still some deficiencies in the research on the impact of urban underlying surface treatment measures on waterlogging risk: the scale of the selected research area is relatively small, mostly a residential area or business district in the urban area, while the entire urban area through the underlying surface Analysis and research on the changes in rainfall and runoff characteristics caused by measures are rare; waterlogging risk analysis calculation models mostly use hydrological models, and the final calculated indicators are generally regional comprehensive indicators such as runoff coefficients and flood peak discharges, which are often not available in urban areas. The specific spatial distribution of storm water and waterlogging risks in the country, and the analysis of the anti-flooding effect of the underlying surface measures will also be limited

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