Author(s): Ticha Lolupiman; Watin Thanathanphon; Piyamarn Sisomphon
Linked Author(s):
Keywords: Drought; Drought index; Satellite data; Web portal; Chao Phraya
Abstract: Drought is one of disaster in Thailand that impacts to life and property. Thai government manages drought situation in the Chao Phraya River Basin through the use of available water from 5 large reservoirs. However, this depends on the precipitation characteristic, quantity and duration of the previous rainy season. Usually, drought risk assessment in Thailand is based on static data such as soil type and texture. However, static map is not sufficient for drought planning because the first priority of drought assessment and planning is precipitation. This research focuses on drought assessment in near real time using overlay and surface analysis technique from satellite based data including PERSIANN, CHIRPS, and TRMM for rainfall data, temperature and vegetation index (NDVI) from MODIS satellite, and soil moisture index from MeTOP satellite which are available on Flood and Drought Web Portal Tools (FDMT): www.flooddroughtmonitor.com. Moreover, the web portal contains well known drought indices such as SPI, EDI, and VHI that cover both meteorological drought and agricultural drought. Drought area in Chao Phraya river basin has been assessed by identifying the drought locations using the drought indices from the web portal. The approximated area is validated using drought map from Land Development Department and official disaster announcement from Department of Disaster Prevention and Mitigation. The result shows that approximated drought area based on the meteorological drought indices from the web portal is about 60% coincide with the actual situation from the official announcement. This confirms the potential use of the FDMT web portal in using the satellite-based data to calculate the drought indices and can be used for drought assessment and planning for Chao Phraya river basin.
Year: 2018