Evaluation of Water System Connectivity in the Xixi Wetland based on Graph Theory
Natural evolution and human activities jointly affect the connectivity of wetland water system,and thus affect the health of wetland ecosystem.In order to quantitatively evaluate the changes in the connectivity of wetland water systems of the Xixi Wetland,the wetland river map was generalized into a river network model with the help of graph theory,and the connectivity of water systems in five subdivisions of the Xixi Wetland in 2009 and 2022 was analyzed by applying the graph theory method,based on which we proposed the connectivity recommendations of the water systems in the Xixi Wetland.The results showed that the area weighted graph theory method can be used to evaluate the connectivity of wetland water system.In 2009,the quantitative evaluation results of weighted connectivity of the five subdivisions of the Xixi Wetland were 3.68,4.24,3.10,5.29,and 2.94,respectively.Compared with 2009,the weighted connectivity of the five subdivisions decreased,and the reduction rate ranged from 0.55％ to 5.75％.According to the connectivity proposals of the 12 broken rivers connected to the nearby river,the weighted connectivity of the Xixi Wetland had increased compared with 2022,and the increase rate ranged from 4.66％ to 34.77％,which indicated that the connectivity of wetland water system had been improved.The research results can provide technical support for the water ecology protection and restoration,and the formulation of connectivity schemes of the Xixi Wetland.
the Xixi Wetlendgraph theoryweighted connectivitywater system connectivity
NETL
NSTL
万方数据
维普
