| The present study describes a process to estimate the water surface elevation on inundated area applying satellite based information. As targeted area, Lower Mekong Basin (LMB), which is frequently flooded area, was selected. Firstly, eight days composite data set of Moderate Resolution Imaging Spectrometer (MODIS) on board Aqua, which is MYD09A1, was applied for obtaining inundated area with calculating Modified Land Surface Water Index (MLSWI). MLSWI from 2002 to 2012 in the part of LMB was well examined, flood inundated areas were then categorized into four zones with specific hydro-geographical features. Secondary, with combining Digital Surface Model (DSM) obtained from the Shuttle Radar Topography Mission (SRTM) as well as the inundated area with MLSWI, horizontal distribution of the water surface elevation (WSE) with the selected types of flooding was estimated. Tuning up of the MLSWI with local gauge information is necessary for better estimation. Finally, an appropriate water surface profile, which conforms hydraulic judgment, was obtained. Results have implications for understanding spatio-temporal variations of flood water during past events, and it will be useful for validation of inundation simulations. |
