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Investigation on flood event variations at space and time scales in the Huaihe River Basin of China using flood behavior classification

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Journal of Geographical Sciences 2020年第12期30卷 2053-2075页

作者： ZHANG Yongyong CHEN Qiutan XIA Jun Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Flood is one of the severest natural disasters in the world and has caused enormous causalities and property *** studies usually focus on flood magnitude and occurrence time at event scale,which are insufficient to contain entire behavior characteristics of flood *** our study,nine behavior metrics in five categories(e.g.,magnitude,duration,timing,rates of changes and variability)are adopted to fully describe a flood *** and interannual variations of representative flood classes are investigated based on behavior similarity classification of numerous *** of geography,land use,hydrometeorology and human regulation on these variations are explored by rank analysis *** show that:five representative classes are identified,namely,conventional events(Class 1,61.7% of the total),low discharge events with multiple peaks(Class 2,5.3%),low discharge events with low rates of changes(Class 3,18.1%),low discharge events with high rates of changes(Class 4,10.8%)and high discharge events with long durations(Class 5,4.1%).Classes 1 and 3 are the major flood events and distributed across the whole *** 4 is mainly distributed in river sources,while Classes 2 and 5 are in the middle and down ***,the flood class is most diverse in normal precipitation years(2006,2008-2010 and 2015),followed by wet years(2007,2013-2014),and dry years(2011 and 2012).All the impact factor categories explain 34.0%-84.1% of individual flood class *** hydrometeorological category(7.2%-56.9%)is the most important,followed by geographical(1.0%-6.3%),regulation(1.7%-5.1%)and land use(0.9%-2.2%)*** study could provide new insights into flood event variations in a comprehensive manner,and provide decision-making basis for flood control and resource utilization at basin scale.

关键词： flood events behavior metrics classification regional and interannual variations potential impacts

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