黄土高原藉河流域1962-2008年径流变化特征

基流是河川流量的重要组成部分,尤其在干旱的黄土丘陵沟壑区径流量中占有很高比重,为枯季的河流提供流量补给,对黄土丘陵沟壑区基流的特点和影响因子的研究有助于合理调控水量和高效使用水资源。采用数字滤波法分别对蔡家川6个嵌套小流域2006—2008年日径流量进行基流分割求算基流指数,并且分析了次降雨量、土地利用、植被类型和地形特征等对基流的影响。结果显示,该地区流域的年平均基流指数范围为0.68～0.82。随着次降雨量增加基流指数减小;土地利用类型中的农地、灌丛和人工林对基流产生负影响;基流指数与流域河网密度和河流比降等线性相关。应用多元线性回归分析得出该区域基流指数BFI与次降雨量P,河网密度D和河流比降S成线性关系,进而分析了研究区内无观测数据的流域的基流。

Runoff Variations in Jihe River Watershed of Loess Plateau from 1962 to 2008

Baseflow is an important component of river flow,especially in the arid loess hilly and gully region.It accounts for a large proportion of total runoff and provide additional flow supply to the rivers during the dry seasons.Therefore,the research of baseflow characteristics and its impact factors in this area could contribute to more reasonable water regulations and more efficient uses of water resources.In this paper,digital filtering method was used to separate the baseflow of Caijiachuan basin from 2006 ...