The assessment of supply and demand of rainfall and flood regulation service is of great significance for identifying water-logging areas,allocating natural resources rationally,optimizing rainfall and flood security patterns.Current researches mostly focus on the capacity of urban rainfall and flood regulation from the single view of supply or demand,but overlook the em-pirical research on the measurement of the supply and demand of the whole-scale rainfall and flood regulation service.And char-acteristics of spatial distribution and key driving factors affecting the balance of supply and demand for rainfall and flood regula-tion services remain to be explored.Taking Tongcheng County,Hubei Province as a case,this research quantified the supply ca-pacity of spatial rainfall-flood regulation services at the county level through SCS-CN Model.Additionally,we evaluated the lev-el of social and economic demand for rainfall and flood services using flood vulnerability indexes,identifying the spatial distribu-tion characteristics of supply and demand and the key areas of the imbalance at the county level.Combining spearman correlation coefficient analysis and redundancy analysis,we investigated the key factors affecting the supply and demand imbalance,consider-ing the effects of population density and construction land area on the supply and demand of rainfall and flood regulation service.Finally,rainfall and flood security patterns were built at the three scales:macroscopic,intermediate perspective,microscopic.The results proved that:①significant spatial difference exists in rainfall and flood regulation supply and demand in the county,necessi-tating an overall perspective in constructing and optimizing rainfall and flood safety patterns.②the central built-up area is the area with the most serious imbalance between supply and demand of rainfall and flood regulation,requiring rainfall and flood safety management and restoration measures.③the key factor influencing rainfall and flood regulation imbalance in the county is popula-tion density,which has a negative correlation with the risk level of rainfall and flood disasters.This research provided quantitative support and basis for identifying areas of imbalance in rainfall and flood regulation supply and demand,as well as optimizing the multi-scale rainfall-flood safety patterns within the territorial spatial planning system.
关键词
雨洪调节服务/供需测度/供需错配/国土空间规划/海绵城市
Key words
rainfall and flood regulation services/supply and demand measurements/supply and demand mismatch/territorial spatial planning/sponge city
维普
万方数据