无定河流域位于黄土高原北部地区毛乌素沙漠南缘，是黄土高原河龙区间一条主要支流。
The Wudinghe watershed is located the south margin of Mu Us desert in the north of the loess plateau, and the Wudinghe River is a main branch in the Hekouzhen-Longmen Reach of the loess plateau.
结果表明：1972年是无定河流域水文序列的突变点，1972年以后人类活动对该流域水文的影响更为显著。
The results show that 1972 is the transition point of hydrological series of Wudinghe, and human activities have affected significantly on hydrology of Wudinghe basin since 1972.
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