SPATIAL MODELING FOR SOIL EROSION ASSESSMENT IN UPPER LAM PHRA PHLOENG WATERSHED, NAKHON RATCHASIMA, THAILAND
Keywords:
Soil erosion, GIS&RS, USLE, Upper Lam Phra PhloengWatershedAbstract
The integration of RS/GIS with Universal Soil Loss Equation (USLE) for soil erosion assessment hasbeen carried out in Upper Lam Phra Phloeng watershed in Nakhon Ratchasima. The study basicallyaimed to spatially model soil loss to be used for soil conservation purposes. Herewith, two Landsat-5TM imageries in 2000 and 2008 were classified by using hybrid techniques for land use and land coverclasses for vegetation cover and field support practice factors of USLE. Also, other USLE factorswhich included rainfall-runoff erosivity, slope length and steepness and erodibility were extracted basedon mean annual rainfall, DEM, soil and geological data. The land use and land cover in 2000 and 2008were extracted with their change. Soil loss maps in 2000 and 2008 were produced based on USLEindicated the amount of soil loss in 2000 was more than 2008. Furthermore, severity of soil losswas reclassified into 5 classes: very low, low, moderate, severe and very severe. The result obtained19.25% moderate, 5.68% severe and 0.02% very severe in year 2000. While the result obtained 17.84%moderate, 5.35% severe and 0.02% very severe in year 2008. Moderate, severe and very severe locationswere here emphasized for the soil and water conservation practices. The change of soil loss severitybetween 2000 and 2008 map was also generated for indicating both increase and decrease in soil lossrate.
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