Urban different underlying surface disaster reduction effect analysis method

Abstract

The invention discloses an urban different underlying surface disaster reduction effect analysis method, which comprises the following steps: step 1, simulating a ponding evolution process under rainstorm situations of different recurrence periods by adopting a two-dimensional hydrodynamic numerical model, analyzing a waterlogging risk distribution situation under urban current situation conditions, and constructing a rainstorm waterlogging calculation model; step 2, according to the current urban land utilization situation, selecting several kinds of underlying surface drainage measures at least including permeable pavement, horizontal green land and concave green land arrangement, grass planting ditch arrangement and roof greening, and analyzing the elastic waterlogging resistance effect of the underlying surface drainage measures; step 3, analyzing combined waterlogging resistance effects of different underlying surface measures; and step 4, performing cost benefit comparative analysis on the waterlogging drainage schemes of different underlying surfaces. According to the method, different types of underlying surfaces are considered on the basis of high-precision terrain, a refined model is established, and rainstorm waterlogging is reliably simulated.

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 ...

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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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