长江中下游流域旱涝急转事件特征分析及其与ENSO的关系（英文）

编号 zgly0001634841

文献类型 期刊论文

文献题名 长江中下游流域旱涝急转事件特征分析及其与ENSO的关系（英文）

作者 闪丽洁  张利平  宋霁云  张艳军  佘敦先  夏军 

作者单位 StateKeyLaboratoryofWaterResourcesandHydropowerEngineeringScience  WuhanUniversity  SchoolofTourismCultureandGeographicalScience  HuanggangNormalUniversity  DepartmentofAppliedMathematicsandTheoreticalPhysics  CentreforMathematic 

母体文献 Journal of Geographical Sciences 

年卷期 2018年08期

年份 2018 

分类号 P426.616  P732 

关键词 dry-wetabruptalternation  themiddleandlowerreachesoftheYangtzeRiverBasin  spatio-temporalcharacteristics  LaNi?a 

文摘内容 During recent decades,more frequent flood-drought alternations have been seen in China as a result of global climate change and intensive human activities,which have significant implications on water and food security.To better identify the characteristics of flood-drought alternations,we proposed a modified dry-wet abrupt alternation index(DWAAI)and applied the new method in the middle and lower reaches of the Yangtze River Basin(YRB-ML)to analyze the long-term spatio-temporal characteristics of dry-wet abrupt alternation(DWAA)events based on the daily precipitation observations at 75 rainfall stations in summer from 1960 to 2015.We found that the DWAA events have been spreading in the study area with higher frequency and intensity since 1960.In particular,the DWAA events mainly occurred in May and June in the northwest of the YRB-ML,including Hanjiang River Basin,the middle reaches of the YRB,north of Dongting Lake and northwest of Poyang Lake.In addition,we also analyzed the impact of El Ni?o Southern Oscillation(ENSO)on DWAA events in the YRB-ML.The results showed that around 41.04%of DWAA events occurred during the declining stages of La Ni?a or within the subsequent 8 months after La Ni?a,which implies that La Ni?a events could be predictive signals of DWAA events.Besides,significant negative correlations have been found between the modified DWAAI values of all the rainfall stations and the sea surface temperature anomalies in the Nino3.4 region within the 6 months prior to the DWAA events,particularly for the Poyang Lake watershed and the middle reaches of the YRB.This study has significant implications on the flood and drought control and water resources management in the YRB-ML under the challenge of future climate change.