Connectivity Evaluation and Planning of a River-Lake System in East China Based on Graph Theory

Table 1

Connectivity evaluation index system.

Classification	Index	Meaning	Evaluation content
Determinant index	Edge Connectivity	The minimum number of edges that must be removed to make a graph unconnected.	Evaluate the connectivity of the entire stream network.
Evaluative index	Edge-Node rate	Divide the number of rivers by the number of lakes and junctions.	Evaluate the number of rivers that each node occupies.
	Connectivity Reliability	The possibility of the Edge Connectivity remains unchanged if one edge is randomly disconnected in a system with Edge Connectivity λ.	Evaluate the reliability of a stream network in the current Edge Connectivity level.; The range is from 0 to 1
	Edge Weights; (m^2)	River section.	Evaluate the discharge capacity of rivers.