Impacts of Summer Monsoons on flood characteristics in the Lancang-Mekong River Basin

Wang，Jie1,2; Tang，Qiuhong1,2; Chen，Aifang3; Tang，Yin1; Xu，Ximeng1; Yun，Xiaobo1,2; Mu，Mengfei1; Wright，Nigel4; Chen，Deliang5

2021

10.1016/j.jhydrol.2021.127256

JOURNAL OF HYDROLOGY   影响因子和分区

0022-1694

1879-2707

The impact of monsoon on rainfall in the Lancang-Mekong River Basin (LMRB) has been well understood, but its impact on flood characteristic across the basin is still unclear. To investigate this impact, the Variable Infiltration Capacity (VIC) hydrological model was used to generate the basin-wide discharge and extract flood characteristics. Indian Summer Monsoon (ISM), Western North Pacific Monsoon (WNPM), and their combined effect (ISWN) were considered and represented by monsoon index. The monsoon impact area was firstly obtained based on the monsoon impact on rainfall, followed by the anomaly analyses of flood characteristics within the impact area to quantify the monsoon impact on floods at local and spatial scales. The results show that the ISM and WNPM (or ISWN) can significantly modulate up to 20% of the rainfall interannual variability in the western and eastern parts of the basin, respectively. The monsoon impact on flood is regionally distributed with impact in tributary larger than mainstream. Over half of the monsoon impact areas show the flood start date averagely advances (delays) 8–12 days, flood volume averagely increases (decreases) by 9%–17.5% and Q averagely increases (decreases) by 7.4%–14.4% during the strong (weak) monsoon years. Also, the comparisons between monsoon local and spatial impacts reveal that the trade-off of water from different areas can disturb the monsoon impact on flood, suggesting that more stations should be used when using the observed data to analyze the monsoon impact. More importantly, the ISM tends to cause the severe flood in northern Thailand, while WNPM and ISWN mainly induce the severe flood in the southeastern part of the LMRB. This study could help to increase the knowledge of the impact of climate change on flood and help with the regional flood managements.

Flood Characteristics Indian Summer Monsoon Lancang-Mekong River Basin VIC model Western North Pacific Monsoon

SCI ; EI

英语

其他

Strategic Priority Research Program of Chinese Academy of Sciences[XDA20060402] ; National Natural Science Foundation of China[41730645] ; International Partnership Program of Chinese Academy of Sciences[131A11KYSB20180034]

Engineering ; Geology ; Water Resources

Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources

WOS:000751941900004

ELSEVIER

20215011319803

Climate change ; Economic and social effects ; Flood control ; Floods ; Rain ; Rivers ; Watersheds

Flood Control:442.1 ; Atmospheric Properties:443.1 ; Precipitation:443.3 ; Surface Water:444.1 ; Thermodynamics:641.1 ; Accidents and Accident Prevention:914.1 ; Social Sciences:971

ENGINEERING

2-s2.0-85120911622

Scopus

1.Key Laboratory of Water Cycle and Related Land Surface Processes,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing,China
2.University of Chinese Academy of Sciences,Beijing,China
3.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,China
4.School of Architecture,Design and the Built Environment,Nottingham Trent University,Nottingham,NG1 4FQ,United Kingdom
5.Regional Climate Group,Department of Earth Sciences,University of Gothenburg,Gothenburg,Sweden

Wang，Jie,Tang，Qiuhong,Chen，Aifang,et al. Impacts of Summer Monsoons on flood characteristics in the Lancang-Mekong River Basin[J]. JOURNAL OF HYDROLOGY,2021,604.

Wang，Jie.,Tang，Qiuhong.,Chen，Aifang.,Tang，Yin.,Xu，Ximeng.,...&Chen，Deliang.(2021).Impacts of Summer Monsoons on flood characteristics in the Lancang-Mekong River Basin.JOURNAL OF HYDROLOGY,604.

Wang，Jie,et al."Impacts of Summer Monsoons on flood characteristics in the Lancang-Mekong River Basin".JOURNAL OF HYDROLOGY 604(2021).