黄土丘陵沟壑区小流域基流特点及其影响因子分析
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1. 青海师范大学,生命与地理科学学院,青海,西宁,810008
2. 中国科学院,西北高原生物研究所,青海,西宁,810008

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X37

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"十二五"科技支撑计划项目"黄土区水源涵养林体系构建技术研究与示范"(2011BAD38B05)


Features of Baseflow and Its Influencing Factors for Small Watersheds in Loess Hilly and Gully Region
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WU Yan-peng1,CHENG Ke-long1,ZHANG Fei1,CHAO Zeng-guo2,WANG Yong-sheng1,CHEN Liang1,YANG Long1(1.Biology & Geography Institute of Qinghai Normal University,Xining,Qinghai 810008,China,2.Northwest Institute of Plateau Biology,Chinese Academy of Sciences,China)

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    摘要:

    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.

    Abstract:

    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 2006to 2008.By calculating the baseflow index (BFI),controlling factors including precipitation events,land use,vegetation cover and terrain characteristics of the basin were analyzed.The results show that annual BFI averages ranged from 0.68 to 0.82.BFIs decreased with increase of precipitation.Agricultural land,scrub and plantation had negative effects on the base flow.BFIs had a linear relationship with rainfall amounts(P),river networks densities (D)and river gradients(S).The regression analysis provides a basis to analyze the characteristics of baseflow in ungauged area.

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引用本文

郭军庭,张志强,王盛萍,张建军,Strauss Peter.黄土丘陵沟壑区小流域基流特点及其影响因子分析[J].水土保持通报,2011,(1):87-92

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  • 收稿日期:2010-06-17
  • 最后修改日期:2010-12-15
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  • 在线发布日期: 2012-10-25
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