As rainfall and runoff are important natural forces to cause soil erosion,studying characteristics of runoff and its affecting factors has significance to understand the laws of soil erosion.Long sequence data of 1909—2005(lack 1943—1952) of the rainfall and runoff and the methods of runs theory,Mann-Kendall and double mass curve were used,and annual variability of the average rainfall and runoff depth of Harbin Station on the Songhua River were analyzed.The results show that: Over the past 87 years,average...
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