Research on Spatiotemporal Evolution Characteristics and Planning Strategies of River System Connectivity in Dujiangyan City
In recent years,with the gradual intensification of artificial activities such as river encroachment,bank hardening and modern water conservancy project construction,the connectivity of the river system has been poorer,which has led to the decline of urban water resources carrying capacity,water environment deterioration and other problems.This paper takes Dujiangyan City,Sichuan Province as the research target area,selects 1998,2008 and 2018 as time slices,establishes a four-dimensional river system connectivity evaluation index system in time,longitudinal,vertical and transversal directions with complex network models and comprehensive analysis methods of mathematical statistics.It is found that in recent years,the longitudinal connectivity of river structure in Dujiangyan has decreased,the trend of trunk is obvious,and the vulnerability of important nodes has increased.The vertical and transversal connectivity is negatively related to the level of urbanization,and the natural form of rivers located in areas with intensive human activities is more seriously damaged.Based on this,a planning optimization strategy for multi-dimensional connectivity of river system is constructed.In view of the scope of the city,a plan for protection and restoration of longitudinal connectivity from"plane-line-point"as a whole to local is proposed.For the central urban area,the vertical and transversal connectivity of the river will be improved by optimizing the land use layout and shoreline design,so as to improve the ecological value of the river system.
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