GIS application in watershed classification in La Ngau basin, Tanh Linh district, Binh Thuan province

Abstract

This paper introduces the results of research wastershed classification in La Ngau basin, Tanh Linh District, Binh Thuan Province. The objectives of research is to identify suitable solutions of land use for each watershed class. Topic uses the three main factors which affect potential erosion, include: elevation, slope and landform to classify. Watershed classification is based on Decision 61/2005/QD-BNN. Applying ArcGIS software and mapping analysis to classify La Ngau basin into 3 levels for potential erosion and drought risk (class). To select the appropriate type of land use for each watershed class, characteristics of vegetation cover in three main forest status including medium forest, rehabilitation forest and forest mixed. The result shows that class 3 is accounting for 25.1%; located mainly in La Ngau, La Da and Da Mi communes; Class 2 has the largest area accounting for 62.2%; Class 1 has the smallest area of 3479.9ha, accounting for 12.7%. The research has proposed some management and landuse solution for each watershed classes in the basin.