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利用太子河流域6个主要支流(海城河、南沙河、北沙河、兰河、细河、太子河南支)1967—2006年日均降水和径流资料,分析了各支流径流系数的变化趋势及其与降水的关系.结果表明:1967—2006年,位于高山丘陵区的太子河南支的年均径流系数较大,而人类活动影响较多的海城河流域的年均径流系数较小;除南沙河的年径流系数总体呈上升趋势外,其余各条支流的年径流系数均呈下降趋势,以南支和兰河的下降趋势尤为明显;除细河流域的年径流系数没有发生突变外,其余各条支流的年径流系数都发生了突变,且突变出现的年份各不相同;年降水量对年径流系数的影响极显著.
Using the daily average precipitation and runoff data from 6 major tributaries of the Taizi River Basin (Haicheng River, Nansha River, Beisha River, Lan River, Xihe River and Prince Edward Branch) from 1967 to 2006, the trend of runoff coefficient of each tributary is analyzed. And its relationship with precipitation.The results show that the average annual runoff coefficient of Prince Edward Branch located in the hilly area is relatively large from 1967 to 2006 while the average annual runoff coefficient of Haicheng River basin with more human activities is less. The annual runoff coefficient of Nansha River generally shows an upward trend, while the annual runoff coefficients of other tributaries show a decreasing trend, especially for the south branch and Lanhe River. The annual runoff coefficient except for the fine river basin does not change suddenly, The annual runoff coefficients of all the other tributaries changed suddenly, and the years in which the mutations occurred were different. The effect of annual precipitation on annual runoff coefficient was significant.