Tropical cyclone rainfall structure affecting indochina peninsula and lower mekong river basin (LMB)

6th Asian Physics Symposium

Chhin, Rattana^1,2 ; Trilaksono, Nurjanna Joko^1 ; Hadi, Tri Wahyu^1

Meteorology Department, Earth Science Study Program, Faculty of Earth Science and Technology (FITB), Bandung Institute of Technology (ITB), Indonesia^1

Rural Engineering Department (GRU), Institute of Technology of Cambodia (ITC), Cambodia^2

关键词: Indochina Peninsula;    Mekong river basins;    North indian oceans;    Principle component analysis;    Rainfall structures;    Temporal structures;    Tropical cyclone;    Typhoon intensities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/739/1/012103/pdf
DOI  :  10.1088/1742-6596/739/1/012103

来源: IOP

【 摘 要 】

Indochina Peninsula is located in between Bay of Bengal (BoB) and South-China Sea (SCS). This region is affected frequently from Tropical Cyclones (TCs) formed in North Indian Ocean (NIO), South-China Sea (SCS), and North West Pacific Ocean (NWP). This research analyzed the structure of the rainfall over Indochina Peninsula and its relationships with TCs from the aforementioned sources. Principle Component Analysis (PCA) was performed to investigate the dominant rainfall area produced from those TCs. Spatial and Temporal structures of rainfall from the TCs is analyzed to understand their propagation. The results show that the dominant TC rainfall area covers Central Vietnam which contributed around 25% to total rainfall in the region. However, the contribution of this TC rainfall over LMB is likely less than 20% where Laos's territory receives highest contribution (20%). Furthermore, from the three source areas, TCs formed in SCS produce the highest rain rate when they develop into typhoon intensity stage of Joint Typhoon Warning Center (JTWC)'s scale. The average duration of TC rainfall over Indochina Peninsula is 81.28 hours, and over LMB is 66.22 hours. Thus, same as other regions in the Indochina Peninsula, LMB is affected by TC rainfall with considerable scales both spatially and temporally that may lead to significant hydrometeorological hazards.