Pattern Analysis and Erodibility of Germi Chai River Route

Rivers are dynamic systems that lateral boundaries and their morphologic characteristics are changing in time continuously. This instability is created by erodibility of river bed and consequently river patterns changing. Case study of this research is Germi Chay in East Azerbaijan province. The purposes of this study are investigation of river patterns and determining erodibility of river route. For these used Landsat satellite images, digital elevation model (DEM), vegetation, geologic and land use maps. In order to determining of river pattern and its Effective factors were used Sinuosity, Central angle indexes and longitudinal profile analysis. Finally river erodibility classes were determined in 5 classes by overlaying effective layers in erodibility. Results indicated pattern of studied river is meandering. Longitudinal profile analysis in both intervals indicated that changing of situation is not seen in longitudinal profile and these changes are in a normal state. This is indicator regular trend in effective factors of river morphological actions. Also results indicated that erodible areas of Medium to high and high are in parts with Structures sensitive to erosion (mainly Quaternary sediments), the lack of suitable and dense vegetation that are caused slope movements in river bed.