海河流域典型山区子流域近34年气候及径流变化趋势

基于海河流域27个气象站点和7个子流域出水口的水文站点34a（1966—1999年）逐日观测气象水文数据，运用非参数统计检验方法（Mann-Kendall法）对滹沱河、冶河、洋河、桑干河、唐河、沙河、潮白河7个典型山区子流域的气候和径流变化趋势及时空分布进行分析。结果表明：（1）降雨量呈下降趋势的测站较多，占66．67％，但大部分都没有通过0．05水平的检验，下降趋势不明显。（2）气温呈上升趋势的测站较多，占88．89％，且大部分测站都通过了0．05水平的显著性检验，上升趋势明显。（3）径流量普遍呈下降趋势，但程度各不相同，南部和西北部流域下降趋势明显（通过了0．05水平的检验），其它子流域不明显。

Variance Tendency of Precipitation and Runoff in Mountain Watershed of Hai River Basin in Recent 34 Years

Based on the daily meteorological and hydrological data of 27 meteorological stations and 7 hydrological stations in the outlet of the region from 1966 to 1999, the spatiotemporal distribution of precipitation and runoff in seven typical mountain watershed such as Hutuo river, Ye river, Yang river, Sanggan river, Tang river, Sha river and Chaobai river of the Hai River Basin were analyzed with the Mann-Kendall test method. The results indicated that the precipitation was not significantly decreased in the most meteorological stations, which took 66.67% , while the temperature was significantly increased in the most meteorological stations, which took 88.89%. The runoff experienced great decrease, but the downward degree was not the same. It significantly decreased in the South and Northwest Parts.