Resilience Dimensional Health Assessment Of The Urban Section Of The Jinshui River In Zhengzhou

Based on the concept of resilience,this paper takes the Jinshui River in Zhengzhou City as the research object for river health evaluation.Firstly,based on a review of relevant research on rivers at home and abroad,the definition of river health under the concept of resilience is clarified,and a health evaluation index system for the Jinshui River is constructed based on three dimensions: social resilience,ecological resilience and flood bearing resilience,and a river health evaluation model is constructed using a combination of weighting method and m atter-element extension model.The river is divided into 16 river sections(the section numbers become larger from the river mouth to the upstream),and the health status and change characteristics of the Jinshui River are assessed and predicted by using Arcgis,ENVI,SWMM and other software combined with field research to extract index measurements.Finally,the results were combined with the analysis of the results to propose urban river optimisation strategies at both macro and micro levels.The conclusions of the study are as follows:(1)The Jinshui River as a whole is in a sub-healthy state,and the health status of each river section shows a large spatial variability.River sections 1(Zhongzhou Avenue to Dongfeng Drainage Canal section),10(Nautical Road Middle to Huaihe West Road section),13(Zhengmi Road to South-North Water Diversion River section),14(Dujiang Road to Zhengmi Road section),15(South Fourth Ring Road to Dujiang Road section)and 16(Bypass Highway to South Fourth Ring Road section)are in a better grade.River sections 2(Jinshui Road to Zhongzhou Avenue section),6(Jingguang Railway to Culture Road section),8(Songshan South Road to Zhongyuan East Road section)and 12(South-North Water Diversion River to West Third Ring Road section)are in medium grade,river sections 3(Chengdong Road to Jinshui Road section),9(Huaihe West Road to Songshan South Road section)and 11(West Third Ring Road to Nautical Middle Road section)are in poor grade,river sections 4(Huayuan Road to Chengdong Road section),5(Culture Road to The river sections in good health are located in the new urban areas at both ends of the river,while those in the old urban areas are in poor health,with more than half of the river sections tending to change to worse levels.Overall,the overall health of the Jinshui River is not optimistic and needs to be improved,with the main focus of improvement being in the old city.(2)There are large spatial differences in the social resilience,ecological resilience and flood-bearing resilience of each river section,with the highest proportion of very poor grades and the most prominent problem being flood-bearing resilience,indicating that flood-bearing resilience is a priority for future river management;in terms of spatial distribution,most of the river sections with better ecological resilience and flood-bearing resilience are located in new urban areas,while the poorer sections are located in old urban areas,and the opposite is true for social service resilience.On the one hand,this indicates that urbanisation has a different influence on the resilience of rivers in each dimension,and on the other hand,it also provides a targeted perspective for the management of river sections in different districts,i.e.the focus of river ecological resilience and flood-bearing resilience restoration is in old urban areas,and the focus of social resilience improvement is in new urban areas.(3)The high proportion of river sections with very poor rainfall regulation capacity,green space service level and hydrophilic rating among the first-level indicators is more prominent among all indicators,and needs to be focused on in future management;in terms of spatial distribution,the accessibility of old urban areas is better than that of new urban areas,while the ecological environment of river channels,ecological environment of riparian zones,ecological environment of river corridors and rainfall regulation capacity of new urban areas are better than that of old urban areas The river has a higher cultural and aesthetic value in both old and new urban areas,and the level of green space services and hydrophilicity are randomly distributed.The difference in urban construction intensity between old and new urban areas shows that the health factors of the Jinshui River have different response patterns to the level of urban construction,and exploring the patterns can provide an accurate scientific basis for the management of the Jinshui River.In addition,the wide range of fluctuations in the secondary indexes of the river indicates that the characteristics of each section of the Jinshui River differ greatly,which proves the scientific validity and reasonableness of this study on the Jinshui River.(4)According to the results of the fit between river health characterisation factors and urbanisation level,the urbanisation level of the Jinshui River has a significant correlation with the indicators of bank connectivity,road network density,completeness of slow walking system,riverfront building volume,water volume,river meandering,barge hardening,landscape resistance,urban temperature environment,riverbank slope and integrated runoff coefficient.In the criterion level,the urbanisation level can effectively explain and predict the ecological resilience and flood resilience of rivers and has a higher ability to explain the flood resilience;at the same time,according to the fitting model of the comprehensive health rating of each river section and the urbanisation level,it can be seen that when the urbanisation level reaches the threshold of 42%,the health level of rivers will be significantly influenced.(4)Based on the analysis of the health evaluation results,a resilience restoration strategy for urban rivers is proposed at both the macro(river basin level)and micro(river section level)levels.The macro level proposes an overall resilience restoration strategy of building an ecological network of blue-green space,linking social service functions and resilient floodbearing for the whole area;at the micro level,an optimisation and enhancement strategy is proposed for four aspects: water ecology,water landscape,water safety and water culture.Finally,a typical river section is selected for optimization and enhancement,and the design results are extracted and analyzed to prove the effectiveness of the design.