水土保持学报2017，Vol.31Issue(2)：142-150,176,10.DOI:10.13870/j.cnki.stbcxb.2017.02.025
1951-2014年洞庭湖水沙阶段性演变特征及驱动因素分析
Evolution Characteristics and Driving Factors of Runoff and Sediment Changes in Dongting Lake During 1951-2014
摘要
Abstract
Based on the data of runoff and sediment discharge measured from 1951 to 2014 in Dongting Lake,evolution characteristics of water and sediment were analyzed by Mann-Kendall test,sliding t-test and ordinal clustering analysis.The relationship between precipitation,runoff,and sediment was analyzed by regression curve fitting and normalization curve,so that the driving factors influencing the variation of water and sediment in Dongting Lake could be figured out.The main results were as follows:(1) There were differences in the mutation year of runoff and sediment into and out the lake.The mutation year was 1971 for runoff into and out of the lake,1985 for sediment into the lake,and 1970 for sediment out of the lake,respectively.(2) The runoff in Dongting Lake was attenuated by the stage,with the change being the most obvious during 1972 to 1977.(3) The sediment into the Lake was characterized by the stage attenuation,and the average annual sediment decreased by 75.34％ from 2004 to 2014.(4) The runoff into and out of the lake was mainly affected by precipitation change during 1951 to 1971 and 1978 to 1985,and by human activities such as beach natural bending cutting,Gezhouba hydro-power stations,Wuqiangxi reservoir and the Three Gorges Project during 1972 to 1977 and 1986 to 2014.(5) The amount of runoff had a certain impact on the amount of sediment into the lake during 1951 to 1971.The main factor affecting the reduction of sediment was the water conservancy project during 1972 to 2014.In summary,the dominant driving factors were different at different stages of the processes of water and sediment in Dongting Lake Basin.The runoff into the lake were mainly driven by water conservancy projects during 1972 to 1977 and 2004 to 2014.The runoff out of the lake were mainly driven by water conservancy projects during 1976 to 1985 and 2004 to 2014.The runoff into and out of the lake were mainly driven by precipitation change in the other two stages.关键词
径流量/输沙量/演变特征/驱动因素/洞庭湖Key words
runoff/sediment/evolution characteristics/driving factors/Dongting Lake分类
天文与地球科学引用本文复制引用
代稳,吕殿青,李景保,王金凤..1951-2014年洞庭湖水沙阶段性演变特征及驱动因素分析[J].水土保持学报,2017,31(2):142-150,176,10.基金项目
国家自然科学基金项目(41571100) （41571100）
湖南省重点学科建设项目(2011001) （2011001）
湖南省教育厅重点项目(16A129) （16A129）
贵州省科学技术基金项目(黔科合LH字[2015]7632号、黔科合LH字[2014]7451号) （黔科合LH字[2015]7632号、黔科合LH字[2014]7451号）
