Simulation and Optimization Strategy of Storm Flood Safety Pattern Based on SCS-CN Model

Abstract

The contradiction between rapid urbanization’s demand for land resources and the ecological environment is increasing, which has led to large-scale hardening of the underlying surface of the city and reduction of land for storage. In addition, construction land occupies rainwater confluence land, resulting in a significant decline in urban stormwater control capabilities. The increasingly frequent flood disasters in recent years have exposed the contradiction between urban construction and stormwater safety that cannot be ignored. Therefore, this article takes the central city of Harbin as the research object, uses ArcGIS for spatial analysis and SCS (Soil Conservation Service) hydrological model simulation to construct the rain and flood safety pattern in the research area, and proposes targeted optimization suggestions and strategies based on the evaluation results to achieve the purpose of coordinating the water ecosystem service function with social and economic development. The research shows that protecting the original stormwater corridor and strengthening the connection between the stormwater control patches can effectively guarantee the connectivity of the stormwater corridor, build the natural stormwater regulation and storage system, and then increase the ability of the city to resist the risk of rainstorm, reduce the disaster caused by urban waterlogging, and achieve the goal of sponge city construction.

Evaluation of Emergency Response Capacity of Urban Pluvial Flooding Public Service Based on Scenario Simulation

“…The SCS-CN model is a precipitation runoff model developed by the water and Soil Conservation Service of the United States Department of Agriculture, which considers regional underlying surface factors and meteorological factors, and reflects the influence of different soil types and land use types on runoff [ 21 , 22 , 23 ]. The SCS-CN model is used to calculate runoff, and the final calculation equation is as follows: where is the direct runoff (mm); is the total precipitation (mm); is the potential maximum retention (mm); = , is the initial loss rate (0.1 ≤ ≤ 0.3), which is mainly affected by geological and meteorological factors.…”

A Study on the Accessibility of the Emergency Medical Services for Urban Kindergartens and Nursing Homes Based on Urban Pluvial Flooding Scenarios

“…where Q is the direct runoff (mm); P is the total precipitation (mm); F is the actual infiltration amount; S is the potential maximum retention (mm); and I a = λS, λ is the initial loss rate. Under the condition of average runoff, the standard value of λ is 0.2 [23,24]. Combining Formulas (1) and ( 2), the surface runoff calculation formula of SCS-CN model can be established:…”