Study On The Post-monitoring And Evaluation Of River Ecological Management Project

At present,water environmental protection has been paid more and more attention.Themanagement project of river course not only has the most basic functions of flood control and drainage,but also needs to meet the requirements of comprehensive management of river ecology and environmental protection.It can better reflect people-Harmony with nature.The purpose of river ecological management project is to promote the restoration of river ecosystem through artificial restoration measures,and to construct a complete and stable river ecosystem.In order to understand whether this transformation has a positive effect on the flow conditions,stability,erosion resistance and water quality of the original river course,it is necessary to carry out the ecological restoration project of the river channel ecological management project.Post-monitoring.The post-monitoring of the river ecological management project can provide reference information for the normal operation and maintenance of the later river ecological management project.provide the basic basis for the future scientific management of water resources,efficient use and effective protection.In this paper,the research on the ecological revetment project of the Changchun Heidingzi River and the artificial wetland project of Fuzhou River in Wafangdian are studied.The study is divided into two parts: one is the post-monitoring of the river channel management project after the completion of the construction of the river bank revetment project,through the field research,the development of monitoring program,select the river bank stability,river bank erosion resistance and river flow rate Indicators,and select the four key sampling points to take water samples for testing.The monitoring data and the results of water quality analysis were summarized and the effect of ecological revetment project was verified.The other part is based on salt(Na Cl)as a tracer,the hydraulic dwelling time of artificial wetland monitoring,combined with water quality testing experiments,analysis of the status of artificial wetlands and wetland purification efficiency for the ecological management of the optimal design and long-term operation to provide water Mechanics foundation.After the implementation of the ecological revetment project,the river bank stability,erosion resistance and flow conditions of the river have been improved,and the removaleffect of the river water pollutants is also better.The project achieved the desired effect.According to the monitoring results of the hydraulic dwelling time of the constructed wetland,the theoretical residence time of the vertical flow of the No.3 vertical flow is 2.72 h and the actual residence time is 1.53 h.The theoretical residence time of the artificial wetland is 4.68 h and the actual residence time is 2.45h;The theoretical residence time of the artificial wetland was 2.65 h and the actual residence time was 1.25 h.It can be seen that the porosity of the wetland becomes smaller and the effective volume of the wetland becomes smaller and the wetting is clogged.Through the comparison and analysis of the hydraulic retention time of different wetlands,it can be seen that the design of the appropriate hydraulic retention time is one of the effective measures to improve the efficiency of artificial wetland purification.