globalchange  > 气候变化与战略
DOI: 10.1016/j.scitotenv.2019.136062
Homogenization and polarization of the seasonal water discharge of global rivers in response to climatic and anthropogenic effects
Author: Chai Y.; Yue Y.; Zhang L.; Miao C.; Borthwick A.G.L.; Zhu B.; Li Y.; Dolman A.J.
Source Publication: Science of the Total Environment
ISSN: 489697
Publishing Year: 2020
Volume: 709
Language: 英语
Keyword: Dam operations ; Evaporation ; Glacial runoff ; Global trends ; Precipitation ; Seasonal runoff
Scopus Keyword: Catchments ; Disaster prevention ; Evaporation ; Floods ; Glacial geology ; Polarization ; Precipitation (chemical) ; Runoff ; Watersheds ; Anthropogenic effects ; Controlling factors ; Drainage area ; Ecological damage ; Glacial runoff ; Global trends ; Primary factors ; Water discharges ; Rivers ; river water ; anthropogenic effect ; catchment ; climate effect ; dam ; evaporation ; glacial hydrology ; homogeneity ; river discharge ; runoff ; seasonal variation ; Africa ; anthropogenic effect ; Article ; Asia ; catchment ; climate ; climate change ; controlled study ; dam (barrier) ; decision support system ; drought ; drug season ; ecology ; environmental factor ; environmental monitoring ; Europe ; evaporation ; flooding ; glacial runoff ; North America ; priority journal ; river ; river basin ; seasonal variation ; trend study ; weather ; West Africa ; Amazon Basin ; Eurasia ; North America ; West Africa
English Abstract: We investigate global trends in seasonal water discharge using data from 5668 hydrological stations in catchments whose total drainage area accounts for 2/3 of the Earth's total land area. Homogenization of water discharge, which occurs when the gap in water discharge between dry and flood seasons shrinks significantly, affects catchments occupying 2/5 of the total land area, and is mainly concentrated in Eurasia and North America. By contrast, polarization of water discharge, associated with widening of the gap in water discharge between dry and flood seasons, occurs in catchments covering 1/6 of the land area, most notably in the Amazon Basin and river basins in West Africa. Considering the major climatic and anthropogenic controlling factors, i.e. precipitation (P), evaporation (E), glacial runoff (G), and dam operations (D), the world's river basins are classified as P, DEP, GEP, and EP types. Contributions from each controlling factor to either the homogenization or polarization of the seasonal water discharge for each type of river have been analyzed. We found that homogenization of discharge is dominated by dam operations in GDEP and DEP river basins (contributing 48% and 64%) and by homogenized precipitation in GEP and EP river basins. Evaporation and precipitation are primary factors behind the polarization of discharge, contributing 56% and 41%. This study provides a basis for a possible decision tool for controlling drought/flood disasters and for assessing and preventing ecological damage in endangered regions. © 2019
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Document Type: 期刊论文
Appears in Collections:气候变化与战略

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Affiliation: State Key Laboratory of Water Resources and Hydropower Engineering Science, School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan, 430072, China; Independent Researcher, Churchtown Upper, Dublin, 999015, Ireland; State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing, 100875, China; School of Engineering, The University of Edinburgh, The King's Buildings, Edinburgh, EH9 3JL, United Kingdom; School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410004, China; Vrije Universiteit Amsterdam, Department of Earth Sciences, Boelelaan 1085, Amsterdam, 1081 HV, Netherlands; Nanjing University of Information Science and Technology, School of Geographical Sciences, Nanjing, China

Recommended Citation:
Chai Y.,Yue Y.,Zhang L.,et al. Homogenization and polarization of the seasonal water discharge of global rivers in response to climatic and anthropogenic effects[J]. Science of the Total Environment,2020-01-01,709
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