Flood inundation in the Lancang-Mekong River Basin: Assessing the role of summer monsoon

Wang，Jie1,2; Tang，Qiuhong1,2; Yun，Xiaobo1,2; Chen，Aifang3; Sun，Siao2,4; Yamazaki，Dai5

2022-09-01

10.1016/j.jhydrol.2022.128075

JOURNAL OF HYDROLOGY   Impact Factor & Quartile

0022-1694

1879-2707

Although it is well known that precipitation and flood pulses in the Langcang-Mekong River Basin (LMRB) are largely impacted by monsoons, it is unclear to what extent flood inundation characteristics (i.e., inundation frequency, depth, area, and timing) in the basin respond to different monsoon types and monsoon combined effect, i.e., the Indian summer monsoon (ISM), the Western North Pacific Monsoon (WNPM), and their combined effect (ISWN). In this study, flood inundation in the LMRB during 1967–2015 was simulated by a hydrological-hydrodynamic model, from which the inundation characteristics were extracted and calculated. The monsoon impact on inundation characteristics was then quantified using the slope from linear regression model. The results show the monsoons and the ISWN overall have a positive impact on inundation frequency, depth, and area, while the inundation timing is usually advanced when the WNPM or the ISWN strengthens but delayed when the ISM strengthens. On average, a unit change in different monsoons can cause, 7.7%–14.2% change in inundation frequency, 5.3%–8.1% change in inundation depth and 4.3 days–5.8 days change in inundation timing for depth, which can also lead to 1.0%–4.3% change in inundation area and 2.8 days–3.8 days change in inundation timing for area. Also, the relative contributions of different monsoons and spatial distributions of the dominant monsoon were discussed. The results indicate different monsoons regulate different inundation characteristics, and suggest the coexistence of monsoon impacts. If the impact of the ISWN is ignored, the WNPM will play a more important role than the ISM in affecting the inundation.

Indian Summer Monsoon Inundation characteristics Lancang-Mekong River Basin Monsoon combined effect Western North Pacific Monsoon

SCI ; EI

English

Others

Strategic Priority Research Program of Chinese Academy of Sciences[XDA20060402] ; National Natural Science Foundation of China[41730645] ; ANSO Collaborative Research[ANSO-CR-KP-2021-09] ; CAS Interdisciplinary Innovation Team["JCTD-2019-04","xbzg-zdsys-202104"] ; JSPS KAKENHI[21H05002]

Engineering ; Geology ; Water Resources

Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources

WOS:000833542500004

ELSEVIER

20222612275747

Atmospheric thermodynamics ; Flood control ; Regression analysis ; Rivers ; Watersheds

Flood Control:442.1 ; Atmospheric Properties:443.1 ; Surface Water:444.1 ; Thermodynamics:641.1 ; Accidents and Accident Prevention:914.1 ; Mathematical Statistics:922.2

ENGINEERING

2-s2.0-85132751704

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.Key Laboratory of Regional Sustainable Development Modeling,Institute of Geographic Sciences and Natural Resource Research,Chinese Academy of Sciences,China
5.Global Hydrological Prediction Center,Institute of Industrial Science,The University of Tokyo,Komaba,Japan

Wang，Jie,Tang，Qiuhong,Yun，Xiaobo,et al. Flood inundation in the Lancang-Mekong River Basin: Assessing the role of summer monsoon[J]. JOURNAL OF HYDROLOGY,2022,612.

Wang，Jie,Tang，Qiuhong,Yun，Xiaobo,Chen，Aifang,Sun，Siao,&Yamazaki，Dai.(2022).Flood inundation in the Lancang-Mekong River Basin: Assessing the role of summer monsoon.JOURNAL OF HYDROLOGY,612.

Wang，Jie,et al."Flood inundation in the Lancang-Mekong River Basin: Assessing the role of summer monsoon".JOURNAL OF HYDROLOGY 612(2022).