摘要
利用三江源区1960~2009年间的月径流数据,使用数字滤波法进行基流分割并使用Depuit-Boussinesq方程进行退水系数计算,同时对径流量、基流量、退水系数分别进行Mann-Kendall趋势检验。结果显示:(1)过去50 a间黄河与澜沧江年内径流量显著减少,而长江源区径流变化趋势不明显;(2)三江源区冬季枯水期径流量主要受基流控制,基流占冬季径流的比值最高可达100%,黄河源区与澜沧江源区过去50 a来基流在不断减少基流的变化趋势和突变点与径流呈现出高度一致;(3)在过去50 a,长江源区的年径流退水过程正在减缓,气候变化影响下,降雨是三江源区径流退水过程的主要影响因素,降雨量的增加会导致退水系数的减小,而温度对三江源区的退水过程影响存在着不确定性。研究为揭示气候变化下三江源区径流退水过程的演变过程提供了理论参考。
Based on the runoff data of the Three-River Headwaters Region（ TRHR） between 1960 and 2009,numerical analysis was coducted through the digital filter method,and the Depuit-Boussinesq equation was used to calculate the recession coefficients. At the same time,the Mann-Kendall trend test method was used in runoff trend analysis. The results showed that：① In the past 50 years,discharge of the Yellow Rivers Headwaters Region（ YERHR） and the Lantsang Rivers Headwaters Region（ LARHR） significantly decreased,but no obvious discharge change was found in Yangtze Rivers Headwaters Region（ YARHR）.② The runoff of the dry season in the TRHR was mainly controlled by the base flow. The ratio of the base flow to the winter runoff could be up to 100%. Base flow of YERHR and LARHR were declining in past 50 years,and Their variation trend and the sudden change point of the base flow are consistent with the runoff.③ Upon the climate change effects,precipitation was the main factor that influenced runoff and recession processes in TRHR. The precipitation increasing of could lead to the decrease of the recession coefficient,while the influences of temperature on the water recession processes in TRHR were uncertain. This study provides a theoretical reference for the evolution of the TRHR runoff processes responding to climate change.
作者
代军臣
王根绪
宋春林
黄克威
朱美壮
DAI Jun-chen;WANG Gen-xu;SONG Chun-lin;HUANG Ke-wei;ZHU Mei-zhuang(Key Laboratory of Terrestrial Process in Mountainous Regions and Ecological Control, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;University of Chinese Academy of Sciences, Beijing 100049, China)
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2018年第6期1342-1350,共9页
Resources and Environment in the Yangtze Basin
基金
国家自然科学基金项目(91547203)
