There are many factors that affect the low flow in a karst basin, such as climate, catchment area, lithology, soil, landform and so on, most of which are uncertain.
喀斯特流域枯水径流特征值的影响因素很多，如气候、流域面积、岩性、土壤、地貌等等，而能够确知的信息不多。
They are hydrologically of catchment, basin character, with different ways of recharge and drainage, and occupying a special position in geomorphologic structure of the drainage area.
分析表明，这些海子在水文上具有不同的集水盆性质、不同的补给形式和排泄方式，在流域地貌结构中占有特殊的位置。
The Chaohe River basin, which accounts for 31% of the area of upper Miyun Reservoir catchment, was selected as the study area.
以占密云水库以上集水流域面积31%的潮河流域作为研究区域。
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