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为研究岩溶地区年径流系数受特殊地貌、地质条件的影响程度,利用贵州省境内23个岩溶流域1961~2000年的径流资料和气象资料,采用Budyko方程拟合表征流域下垫面特征的参数值,并通过Mann-Kendall方法与相关分析,分析年径流系数变化趋势及其与流域下垫面特征的关系。结果表明,贵州省多年平均径流系数的空间分布与流域坡度呈正相关,与碳酸盐岩所占比例呈负相关;1961~2000年年径流系数呈增大趋势,与下垫面特征参数变化趋势一致,可见相对于气候变化,下垫面变化是影响贵州省年径流系数变化的主要因素。
In order to study the annual runoff coefficient of karst area affected by the special geomorphology and geological conditions, the Budyko equation was used to fit the parameters of the underlying surface features of 23 karst basins in Guizhou Province from 1961 to 2000 The trend of annual runoff coefficient and its relationship with underlying surface features were analyzed by Mann-Kendall method and correlation analysis. The results showed that the spatial distribution of multi-year average runoff coefficient in Guizhou Province was positively correlated with the slope of the basin and negatively correlated with the proportion of carbonate rocks. The annual runoff coefficient increased from 1961 to 2000, Consistently, it can be seen that under the climate change, the underlying surface changes are the main factors affecting the annual runoff coefficient variation in Guizhou Province.