Geomorphological Facies Zonation, Using GIS and RS and its Application in Natural Resources. (Case Study of Kouhdasht Watershed)

In recent years, the occurrence of water and wind erosion in different parts of country due to the changes of land use from the forest and pasture into the agricultural and also construction of communication lines have increased. The study and research on this phenomenon, the effective factors in creating them and also identification of geomorphology facies types are necessary to prevent the waste of water and soil resources and their damages. In this study, in order to homogenize the studies and prevent the disperse works; we have tried to generate a base map based on geomorphological one. Thematic maps such as lithology and slope erosion facies map were also combined and finally obtained a homogeneous unit map (work units) which has a special place in natural resources studies. Considering the characteristics of each of these homogeneous units, there should be a special planning to protect and restore them. Therefore, considering the nature of this study, it can be a basic platform and be used in other studies. According to researches, 12 geomorphological facies were identified in the region. These facies are in mountain and pediment units; so three types of pediments including erosion, appendage and covered ones were distinguished in pediment unit. Different facies with specific characteristics were determined in each of these types. Finally, considering the natural power (potential) of facies and current status of land use, a management program was suggested.