Baseflow Separation and Its Response to Meteorological Drought in a Temperate Water-limited Basin,North China  

作　　者：LIU Qiang YAN Sirui LI Miao MA Kiaojing LIANG Liqiao ZHANG Junlong PAN Jihua 

机构地区：[1]State Key Laboratory of Water Environment Simulation,School of Environment,Beijing Normal University,Beijing 100875,China [2]Key Laboratory for Water and Sediment Sciences,Ministry of Education,School of Environment,Beijing Normal Universit,Beijing100875,China [3]School of Geography and Tourism,Qufu Normal Universit,Rizhao 276826,China [4]Key Laboratory of Tibetan Environment Changes and Land Surface Processes,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing,100101,China [5]School of Geography and Environment,Shandong Normal University,Jinan 250358,China

出　　处：《Chinese Geographical Science》2021年第5期867-876,共10页中国地理科学（英文版）

基　　金：Under the auspices of the Major Science and Technology Program for Water Pollution Control and Treatment(No.2018ZX07110001);National Key Basic Research and Development Project(No.2017YFC0404505);National Natural Science Foundation of China(No.42071129,41771042,51579008)。

摘　　要：Baseflow,a component of the total streamflow,plays a key role in maintaining aquatic habitats,particularly during extreme drought events.This study investigated baseflow response to a prolonged and extreme meteorological drought event in the Baiyangdian Basin(BYD basin),a temperate water-limited basin in North China.Applying a precipitation series,piecewise regression was used to determine this extreme meteorological drought event,while the Automatic Baseflow Identification Technique(ABIT)was used to estimate a recession parameter(α),which was used to isolate baseflow from total streamflow.Results showed that:1)annual precipitation exhibited significant decreasing trends(P<0.05)with an average change of–1.81 mm/yr^(2).The precipitation deficit revealed that the start and end date of the extreme meteorological drought event was from August 1996 to May 2011,respectively,persisting for a total of 178 months(roughly 15 yr);2)hydrological drought(including streamflow and baseflow)lagged behind meteorological drought while predictably persisting longer than extreme meteorological drought(i.e.,precipitation);and 3)baseflow decreased dramatically under meteorological drought at both seasonal and annual scales,resulting in significantly decreasing trends during drought periods.Findings from this study confirmed that hydrological events caused by extreme meteorological drought can alter the magnitude and duration of baseflow and total streamflow,which will have an inevitable influence on aquatic ecosystems.

关 键 词：BASEFLOW extreme drought recession parameter Baiyangdian Basin 

分 类 号：P426.616[天文地球—大气科学及气象学]