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

Abstract

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