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黄土高原流域出口站降雨的面代表性分析
Authors
焦菊英
王万中
郝小品
Publication date
1 January 1999
Publisher
Abstract
根据黄土高原10个50—350km2的小流域83个雨量站390场暴雨实测资料,对流域出口站降雨的面代表性进行了分析,包括流域出口站次雨量的面代表性、次降雨最大时段雨强的面代表性、年雨量的面代表性分析。结果表明:流域出口站次降雨的面误差程度随着流域面积的增大而增大,出口站雨量大于面雨量的正误差机率为39.1%,出口站雨量小于面雨量的负误差机率为60.9%,说明出口站雨量普遍小于面雨量;出口站雨量与面雨量正误差绝时值大于负误差绝对值,说明出口站雨量大于面雨量的正误差程度要比负误差程度大。另外,出口站次降雨最大时段雨强的面误差程度要比次雨量大;对于局地性降雨来说,按10%误差计算,流域出口站可代表的流域面积为15—20km2;按20%的误差计算,流域出口站可代表的流域面积为30—50km2;流域面积超过50km2,流域出口站面雨量的误差程度超过30%
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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Last time updated on 21/09/2018