SRTMデータおよびGISを用いたタイ南部ハジャイ平野の微地形と洪水に関する研究 [in Japanese] Research on the Flood and Micro Landforms of the Hat Yai Plain, Southern Thailand with SRTM Data and GIS [in Japanese]
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The purpose of this study is to clarify the relationship between the 2000 flooding and landforms of the HatYai lowland, southern Thailand. The HatYai lowland is located in southeastern part of Peninsular Thailand and facing to the Songkhla Lake. The main river of the plain is the U-taphao, and natural levees which are formed by the river and their tributaries develop widely in the main part of the plain. Flood water level of the 2000 flood in the flood basin (back swamp) of the plain was over 2m in some inundated areas, and its maximum depth was 4m in the eastern marshy lowland. In contrast to flood basin, water depth in the areas on natural levee was 1m or less. Over bank floodwater was interrupted by micro-landform and artificial embankment of the abandoned railway. In order to examine the relationship between inundated area and flood water level, SRTM DEM data were used with GIS. The maximum water level of the 2000 flood in the eastern and western part of the plain is larger than the depths expected from the ground level estimated by the SRTM DEM data, and this is considered to have been caused by the strong flood stream flow to the eastern and western part of the plain. Stream flow of virtual drainage network based on the SRTM DEM shows good coincidence with the overflown flood water measured in the field. And the virtual drainage network based on the SRTM data is considered to be a good information for the prediction of the flooding in the lowland.
- Transactions,Japanese Geomorphological Union
Transactions,Japanese Geomorphological Union 27(2), 205-219, 2006-04-25