Evaluation of sustainable development of flood storage area based on AHP-fuzzy comprehensive evaluation method
Huangcaoweis are national-level storage and detention zones in the Chu River basin.The two regions serve a dual function for flood control by retaining excess water and ensuring the survival and development of local residents by water supply.The reality of a growing population and limited land has given rise to a multifaceted role for flood storage areas in China,encompassing flood control and development.In addition,the flood storage area also possesses ecological functions such as climate regulation,which bestows unique ecological service functions and economic value.Therefore,we should correctly deal with the relationship between flood control,development and ecological environmental protection in these regions,maintain and maximize the functions and benefits of the flood storage area,putting flood storage areas on a gradual path to sustainable use.Taking these two flood storage areas as case studies,an assessment of their ecological service value is conducted,mainly including values of climate regulation,water purification,air purification,soil conservation,carbon fixation,biodiversity and scientific research and education.Various accounting methods,including the alternative cost method and outcome parameter method,are applied to evaluate the value of each service.Accurate quantification of the ecosystem's service value facilitates the integration of ecological benefits into the economic and social development evaluation system.On the basis of calculating the value of regional ecosystem services,evaluation indicators are constructed for the sustainable development of flood storage and detention areas from three aspects:flood prevention,economic and ecological functions.The sustainable development level of flood storage and detention areas are evaluated by AHP-fuzzy comprehensive evaluation method,incorporating weights assigned by the AHP method and comprehensive evaluation is made by fuzzy comprehensive evaluation method.According to the evaluation results,the relationship between flood control,economy and ecology is coordinated to maximize the comprehensive benefits of various functions of the flood storage area and realize the sustainable development of the flood storage area.Meanwhile,scenario analysis and development prediction for the future state of the flood storage area are carried out to provide a reference for the quantitative evaluation of ecological benefits and sustainable development of the flood storage area.The results show that the sustainable development level of the Huangcaoweis are general,which basically accords with the development pattern in the polder area.A reduction in the ecological function of farmland and wetlands at the current stage of flood storage area development would lower its sustainability.Conversely,if the flood storage area shifts toward farmland ecological transformation and expansion of wetland areas,its sustainable development level could surpass the current stage.Finally,the challenges encountered during the sustainable development process are addresses in the two flood storage areas and proposes corresponding suggestions and countermeasures.To alleviate issues related to regional water withdrawal challenges,it is recommended to expedite water withdrawal through drainage ditch dredging and drainage station construction.For this kind of flood storage area where agricultural development takes precedence,adjustments to the crop planting structure are suggested,planting crops with high economic value and good water resistance to optimize and adjust the land use mode in the flood storage area,and to reduce the flood disaster losses.Leveraging the region's advantages,an emphasis on ecological farming is encouraged to establish a distinctive farming model.Developing ecological wetlands and agricultural sightseeing projects according to local conditions,the region's vital ecological role can be maximized,and striving to achieve sustainable development of the region.
flood storage areasustainable developmentecological value accountingindicator systemfuzzy comprehensive evaluation
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