【摘要】 影响流域的枯水径流及其变差系数的因素很多 ,如气候、岩性、地貌、植被、土壤等。本文借助于GIS软件和SPSS统计软件 ,对喀斯特流域地貌类型进行划分和数字化 ,并通过聚类分析把各流域按地貌类型的差异进行归类 ,研究不同地貌类型及其空间配置的差异与枯水径流特征值之间的相互关系 ,从而揭示地貌类型的差异对流域枯水的影响。更多还原

【Abstract】 Many factors affect the runoff modulus and the variation coefficients of low flow, such as climate,rock, soil, plant, landforms, and so on. In karst drainage basins, the factors of geology, topography and landforms are complicated and they affect the low flow modulus together since they influence each other and condition each other. In this paper the authors study the characteristics of low flow modulus making use of specific properties of different landforms.Firstly, landforms in karst regions are divided and digitized by means of GIS and SPSS software.All drainage basins were classified according to different types of landforms through cluster analysis in order to research the dimensions of low flow modulus in regions with different landforms types.In general,the following points are identified as: 1)the low flow modulus is smaller in regions with Fengcong landforms than Fenglin landform;2)the low flow modulus is smaller in karst regions than in non-karst regions; and 3) it is bigger in regions with mixed types of landforms than in others. Secondly, the impact of different types of drainage landform on low flow modulus are analyzed through different spatial distribution of landform types.The result is that even in karst regions with the same types of landforms,the low flow modulus would vary because of differences in spatial distribution. In a word,landform types constitute an important factor affecting low flow runoff modulus and this conclusion is essential in evaluating the value of water resource in karst regions.更多还原