Monitoring the variability of precipitable water vapor over the Klang Valley, Malaysia during flash flood

7th IGRSM International Remote Sensing & GIS Conference and Exhibition

地球科学;计算机科学

Suparta, W.^1 ; Rahman, R.^1 ; Singh, M.S.J.^2

Space Science Centre (ANGKASA), Institute of Climate Change, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor Darul Ehsan, Malaysia^1

Department of Electrical, Electronic and Systems Engineering, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor Darul Ehsan, Malaysia^2

关键词: Business activities;    Flash flood;    Heavy rainfall;    Local weather conditions;    Precipitable water vapor;    River water;    Surface meteorological data;    Surface pressures;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/20/1/012057/pdf
DOI  :  10.1088/1755-1315/20/1/012057

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

Klang Valley is a focal area of Malaysian economic and business activities where the local weather condition is very important to maintain its reputation. Heavy rainfalls for more than an hour were reported up to 40 mm in September 2013 and 35 mm in October 2013. Both events are monitored as the first and second cases of flash flood, respectively. Based on these cases, we investigate the water vapor, rainfall, surface meteorological data (surface pressure, relative humidity, and temperature) and river water level. The precipitable water vapor (PWV) derived from Global Positioning System (GPS) is used to indicate the impact of flash flood on the rainfall. We found that PWV was dropped 4 mm in 2 hours before rainfall reached to 40 mm and dropped 3 mm in 3 hours before 35 mm of rainfall in respective cases. Variation of PWV was higher in September case compared to October case of about 2 mm. We suggest the rainfall phenomena can disturb the GPS propagation and therefore, the impact of PWV before, during and after the flash flood event at three selected GPS stations in Klang Valley is investigated for possible mitigation in the future.