改进图论法在河湖水系连通规划中的应用研究

Application of Improved Graph Theory in Planning of River and Lake System Connection

通过分析感潮河网地区的河网水系特点、水动力条件和水环境现状,以基于“水流阻力”的图论连通度理论和“最短路”思想的水系连通性诊断和优化方法初步拟定连通方案,并采用一维水动力水质数学模型进一步细化方案。结果表明:通过图论初步拟定的最小阻力连通方案为结构连通性最优方案,数学模型细化方案后解决了由于水闸调度方式引起的连而不通的问题。该方法可快速诊断河湖水系的结构连通性,丰富了河湖连通诊断手段,可为珠三角感潮河网地区水系连通规划提供一定的参考。

This paper first analyzes the river system characteristics,hydrodynamic conditions,and status quo of water environment in the tidal river network area.On this basis,a preliminary connection scheme is then drawn up by the concept of connectivity in the graph theory based on“flow resistance”and the connectivity diagnosis and optimization method of river systems based on the“shortest path”idea.The scheme is further refined by a one-dimensional hydrodynamic mathematical water quality model.The results reveal that the scheme of minimum resistance connection by the graph theory is the optimal scheme of structural connectivity,and the problem of connection failure caused by the sluice control mode is solved after the scheme is refined by the mathematical model.This method can quickly diagnose the structural connectivity of river and lake systems,enrich the diagnostic means of river and lake connectivity,and provide a reference for the planning of river system connectivity in the tidal river network area of the Pearl River Delta.