TAILIEUCHUNG - Báo cáo " DETERMINING FLOW ENERGY AND EROSION COEFFICIENT FOR CLASSIFICATION OF POTENTIAL EROSION IN BINH DINH PROVINCE "

The mountainous area occupies three fourth of the total area of Binh Dinh Province. The potential of landuse is very large. However, under the influence of irrational exploitation and natural disasters in the past, the land resource has declined, thus leading to the decline of forest resource. Furthermore, the increase of unused land and bare hills along with the decrease in the cultivated area seriously influenced on the ecological environment as well as the socio-economic development. Therefore, the classification of erosion potential and the identification of highly assuming erosive areas (regardless of the role of the forest cover). | vnu journal of science earth sciences n0i 2007 determining flow energy and erosion coefficient for classification of potential erosion in binh dinh province Luong Thi Van Faculty of Geography Quy Nhon University ABSTRACT. The mountainous area occupies three fourth of the total area of Binh Dinh Province. The potential of landuse is very large. However under the influence of irrational exploitation and natural disasters in the past the land resource has declined thus leading to the decline of forest resource. Furthermore the increase of unused land and bare hills along with the decrease in the cultivated area seriously influenced on the ecological environment as well as the socio-economic development. Therefore the classification of erosion potential and the identification of highly assuming erosive areas regardless of the role of the forest cover are of a great significance in protecting the cultivated land and reducing soil erosion improving ecological environment thus gradually eradicating hunger and reducing poverty and improving living standard of people. The author has used a method for classification of erosion potential M which is based on the identification of numerical values of flow energy Y and erodability factor K . K is determined by the quantity of grain force of various types of soil in mountainous areas and the numerical values of Y are calculated on each 1ha pixel on four main rive basins in Binh Dinh as Y I -75xAh 5xP1 5 where I is the slope Ah is the height difference absolute height subtracts height of base erosion at the valleys P is the average annual rainfall. The result has identified three groups of cultivated land convertible land equivalent to three levels of the erosion potential low normal high that is needed for protecting measures at different levels. Furthermore we classified 100 out of 155 communes of different erosion potentials at province-wide scale. 1. Introduction The mountainous area occupies three fourth of the total

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