Abstract: The traditional Thiessen polygon method and DEM correction were adapted to study the nopoint precipitation and the effect on streamflow of Heilong hydropower station, located in Xiaohei river basin of Yunnan province. Compared with the traditional Thiessen polygon method, the mean elevation and precipitation over the Heilong hydropower basin increased by different degree based on the DEM data. However, the runoff coefficient of the design and reference watershed reduced and the mean discharge of design basin increased slightly.

Key words: precipitation, elevation, DEM, streamflow, Heilong hydropower station

摘要： 采用泰森多边形法及数字高程修正两种方法对云南省小黑江流域黑龙水电站面降雨量进行分析，分析对径流的影响。结果表明，相对于采用传统泰森多边形法，采用数字高程栅格数据计算的黑龙水电站坝址以上平均高程和流域面雨量均有不同程度增加，而设计流域和参证流域的径流系数均有一定程度的减小，设计流域的平均流量会有所增加但增幅不大。

关键词: 降雨量, 高程, DEM, 径流, 黑龙水电站