Analysis of environmental heterogeneity and driving forces of water network in river basins
[Objective]The generation of water network structure and types is related to various environmental factors.Analyzing the environmental heterogeneity and driving forces of water networks is an important foundation for adjusting water system struc-ture,reasonably restoring and protecting water networks.[Methods]Taking the Yellow River Basin,Huaihe River Basin,Haihe River Basin,and Yangtze River Basin as research area,based on typical water network types,a systematic analysis and compari-son of environmental heterogeneity in the four major river basins is conducted.Further use Pearson correlation analysis,redun-dancy analysis,and Geodetector analysis method to quantitatively sort out the explanatory power of each factor on the structure and types of water network.[Results]The research has found that within the reticulated and mixed water network basins,the proportion of slope ranging from 0.0° to 5.0° is greater than 55.05％,the proportion of terrain undulations ranging from 0 to 70 m is greater than 67.98％,and the land use types are mostly cultivated land and artificial surface.In rectangular,parallel,den-dritic,and fan-shaped water networks,the proportion of slopes ranging from 5.0° to 35.0° is greater than 62.42％,the propor-tion of terrain undulations ranging from 70 to 500 m is greater than 49.63％,and the land use types are mostly cultivated land,forest land,and grassland.The intensity of soil erosion,precipitation,humidity index,temperature,and number of water con-servancy facilities also exhibit heterogeneity in different water network types.There is a significant positive correlation between climate factors and river sinuosity.And terrain,the number of water conservancy facilities are significant negatively correlated with the water network density and the maximum frequency of river flow direction.The total interpretation rate of the selected fac-tors on the characteristics of water network structure is 53.47％.[Conclusion]The structure and types of water network are influ-enced by a combination of multiple factors.The slope and humidity index have a significant impact on the water network struc-ture,with explanatory rates of 21.40％and 16.50％,respectively.The precipitation has the highest explanatory power for water network types,which is 16.61％.The interaction between development level and climate factors has a significant impact on the formation of water network types,with an explanatory degree of nearly 50％.
water network structurewater network typesYangtze River basinYellow River basinHuaihe River basinHaihe River basinenvironment heterogeneitydriving force analysishuman activity
万方数据
维普
