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黄土高原藉河流域1962-2008年径流变化特征
郭军庭,张志强,王盛萍,张建军,Strauss Peter
1. 北京林业大学,水土保持学院,北京,100083
2. 华北电力大学,能源与环境研究中心,北京,102206
3. The Federal Institute of Land and Water Management Research,A-3252,Petzenkirchen,Austria
摘要:
采用1962-2008年近50a的径流资料,应用统计分析方法,对黄土高原第三副区藉河流域的径流变化进行了分析.结果表明,流域径流呈明显下降趋势,20世纪70,80,90年代和2000年以来径流分别是60年代的62.3%,61.1%,30.2%和35.2%,年均递增率为-2.1%,年际变差系数为0.75;流域径流年内分配极不平衡,汛期径流占全年总量达50.8%~95.2%,平均76.5%,不均匀系数为1.13;根据径流丰枯等级划分,藉河流域60年代至今分别经历了丰水期、平水期、偏丰期和枯水期,1990年以来流域径流急剧下降,出现连续9a的枯水年,这与流域内近些年大规模水土保持综合治理密切相关,深入分析土地利用/覆被变化的水文要素响应也是该区未来的研究重点.
关键词:  藉河  径流  变差系数
DOI:
分类号:S273.29
基金项目:国家自然科学基金项目"黄土高原地区典型多尺度耦合流域土地利用/覆被的水文生态响应研究"(40871136)
Runoff Variations in Jihe River Watershed of Loess Plateau from 1962 to 2008
GUO Jun-ting,ZHANG Zhi-qiang,WANG Sheng-ping,ZHANG Jian-jun,Strauss Peter
GUO Jun-ting1,ZHANG Zhi-qiang1,WANG Sheng-ping2,ZHANG Jian-jun1,Strauss Peter3(1.Institute of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China,2.North China Electric Power University,Energy and Environment Research Center,Beijing 102206,3.The Federal Institute of Land and Water Management Research,A-3252 Petzenkirchen,Austria)
Abstract:
Based on the runoff data during the period between 1962and 2008,runoff variations in the Jihe river watershed(1019km2), located in the third sub-region of the Loess Plateau,were characterized using statistical analysis.The results indicate that the runoff presented a evident decreasing trend during the research period,and the runoff in the 1970s,1980s,1990sand 2000saccounted for 62.3%,61.1%,30.2% and 35.2% of the 1960srespectively,with an annual increasing rate of-2.7%and and a variation coefficient of 0.75.It was observed that inter-annual distribution of runoff was greatly unsteady,and the runoff percentages in flood seasons ranged from 50.8%to 95.2% with an average of 76.5%and a monthly variation coefficient of 1.13.According to wet and drought year classification of the runoff,Jihe river watershed has gone since the 1960s through the periods of wet year,average year,sub-wet year and drought year,respectively.The runoff decreased dramatically after 1990,lasting a nine-year period of drought,in coincidence with the large-scaled implementation of soil and water conservation.Thorough descriptions of the response of hydrological factors to land use and cover changes are another requirement for future study in the watershed.
Key words:  Jihe river  runoff  variation coefficient  anomaly