Research On The Optimization Model Of Ecosystem Service Value Of River-lake Connectivity Project In Western Jilin Province

Assessment of ecosystem services value is a hot issue in the construction of ecological civilization in China,and it is also a long-term concern of the theoretical circles.This paper took the river-lake connection project in Western Jilin as the case study,based on the concept of ecosystem service value of rivers and lakes wetlands,the model was built based on the related issues of regional ecosystem service value and index system,which not only improved the index system of ecosystem service value in Western Jilin,but also realized the efficient utilization of water resources and the maximization of incremental value of ecosystem service under multiple scenarios.The theoretical foundation is laid for the optimization of river-lake ecological water replenishment based on the value of ecosystem services.(1)Based on the principle of wetland ecosystem service value and the characteristics of lake and wetlands in the project area,and according to the principle of evaluation index system,the assessment system of ecosystem service value in Western Jilin Province was improved and constructed,which lays a theoretical foundation for the optimization and regulation of regional water diversion and recharge schemes based on the increment of ecosystem service value.(2)According to the assessment system of ecosystem service value,aiming at maximizing the increment of regional ecosystem service value,a deterministic optimization model of ecosystem service value of river-lake connection project in Western Jilin is developed by using linear programming method.Compared with the basic scenario,the value of ecological service decreased by 3.37% in dry year,and increased significantly in normal year and wet year,with the increments of 23.41% and 74.49% respectively.It shows that the model can be used for the managers to formulate the optimal adjustment of water intake and replenishment in project areas.The scheme provides theoretical support for maximizing the value of ecological services.(3)In accordance to deterministic optimization model,in order to further tap the incremental potential of ecosystem service value and fully consider the characteristics of precipitation distribution and the randomness of changes in ecological water requirement of each lake in the study area in different seasons,the bilateral stochastic constrained programming method is adopted to measure the incremental value of river-lake connected ecosystem service.Compared with the deterministic model optimization scheme,the incremental value of ecosystem services increased,which could provide a scientific basis for decision makers to make decision plans.(4)On the basis of the bilateral chance-constrained integer optimization model,the established model takes account of the uncertainty of the size of the lake bubble and wetland planning area in the study area,introduces the fuzzy planning method,and presents the river-lake connectivity based on the fuzzy-bilateral opportunity constrained stochastic programming.The optimization improves the utilization of flood resources and reduces the normal state on the basis of meeting the regional ecological water demand.And wetland ecological restoration program provides a theoretical basis.(5)Based on the fuzzy-bilateral chance-constrained stochastic model and the objective of maximizing the incremental value of ecological services in Western Jilin Province,the estibilished model fully considers the stochastic uncertainty of flood resources,constructs an incremental optimization model of river-lake connectivity ecological services value based on fuzzy-two-stage-bilateral chance-constrained stochastic programming,and uses stochastic variables with different probability levels for flood resources.The water resource allocation schemes superior to the two extreme cases and the water diversion and recharge schemes for the functional areas of the lakes are obtained by solving the model.In summary,the necessity of incremental optimization of ecological service value of river-lake connection project in Western Jilin is clarified firstly in this study.At the same time,the multiple uncertainties of regional development planning requirements,wetland ecological water demand quota,rainfall,flood resources and other parameters are taken into account.Combined with uncertain optimization theory and method,the ecological service of river-lake interconnection project in Western Jilin Province is deeply developed.To some extent,the research on value optimization makes up for the deficiency of wetland ecosystem service value.