Accessibility evaluation of water networks based on network analysis
[Objective]To investigate the spatial pattern of water resources accessibility,facilitate the optimization of water resources allocation,and scientifically plan the water system layout,[Methods]a calculation method of water network accessibil-ity based on network characteristics and water intake cost is proposed.The network analysis tool sDNA is utilized to calculate network accessibility indexes,while the weight of each index is determined using CRITIC method.A weighted sum approach is employed to obtain an overall assessment of network accessibility,and then the spatial expansion is carried out by kernel density estimation.Based on the comprehensive consideration of terrain,land use and road factors,the pan-basin cost resistance grid data is made,and the network accessibility of water network subtracts the cumulative cost resistance,so as to evaluate the acces-sibility of water network.[Results]The mean accessibility of the study area is 0.31,the standard deviation is 0.04,and the coefficient of variation is 0.13.When the river network is a more natural water system,accessibility presents a dendritic distribu-tion,and gradually weakens from the main river to the tributary,and decreases as it moves away from the river.In areas with rel-atively flat terrain,frequent human activities and developed artificial channels,dense areas with high water network accessibility will appear at some river conjunctions,such as the middle reaches of the Han River,the middle reaches of the Yangtze River,the Taihu Lake basin,the Lixia River basin,the Huang-Huai-hai Plain and the Weihe River Plain.[Conclusion]The results show that from the perspective of network analysis,the water network is regarded as a topological network to calculate the accessi-bility of the water network,and the application in large scale area is realized.At the same time,the influence of water intake cost and resistance on local accessibility is considered,which increases the accuracy of accessibility result.This provides an important basis for the realization of fine water resources management.
water accessibility evaluationcost distancekernel density estimationinfluence factor
万方数据
维普
