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重点探讨在GIS支持下建立分布式单位线模型的方法和途径.以姜湾小流域为例,分析了姜湾流域的空间特性,如流向、坡度、理论流路图、流程的长度等,借助等流时线法推求流域的时间面积曲线(即S曲线),得出流域的分布式单位线,从而推算出流域的径流过程.经计算值与实测值对比分析,认为该模型有较好的模拟效果.该研究为GIS在产汇流中的应用提供了经验模式.
This paper focuses on the methods and ways of establishing distributed unit-line model with the support of GIS. Taking Jiangwan watershed as an example, the spatial characteristics of Jiangwan watershed are analyzed, such as flow direction, slope, theoretical flow path, length of flow, etc. The isobath-time method deduces the time-area curve (S-curve) of the river basin to obtain the distributed unit hydrograph of the river basin, and then deduces the runoff process of the river basin.Comparing the calculated value with the measured value, the model is considered as good Simulation results. This study provides an empirical model for the application of GIS in production and convergence.