LANDSAT Application and Classification Disaster Area on Yom River Basin

摘要

The area of Yom River Basin had 23616 square kilometer which covered 11 provinces consisted of Phayao, Nan, Lumpang, Phrae, Utradit, Tak, Sukhothai, Phitsanulok, Kamphaengphet, Phichit and Nakomsawan provinces. There are eleven sub-basin in Yom River Basin and some areas in this basin was in serious flood in rainy season. LANDSAT images was used for classification the land use, calculation and estimation the direction of water flow and the severity of flooding. The data base for estimation flooding severity or the probability of flooding in each sub-basin were consisted of annual rainfall, slope, the boundary from the main rivers, the density of rivers and canals, area of sub-basin, land covered and soil textures. The result from this study was showed that the highest risk flooding area in Yom River Basin must be occurred on Phitsanulok. The moderate risk had classified in the area of Kampangphet, Sukothai, and Phichit provinces, respectively. The highest sensitive areas on flooding had covered 11,658.22 square kilometer or 60.99% of Yom River Basin. The high, moderate and mildly sensitive areas had covered 3,850.33 ; 1,582.34 and 2,025.11 square kilometer or 20.14% 8.28% and 10.59%, respectively.