relation between dominant watershed processes and river morphological changes )case study: firoze-shahjoob river(

the morphology of a river system is affected by dominant watershed processes includingclimatic, hydrologic, hydraulic, erosion and sedimentation, geological and topographicalcharacteristics of the river environment and watershed. understanding the interaction betweenthe river form and dominant watershed processes in river systems is necessary for recognitionof river behavior and of importance for developing river environments conceptual models.in this research the aim was to evaluate morphological characteristics caused by dominantwatershed processes in the firoozeh-shahjoob river of north khorasan and extract equations inorder to mathematically link between the river physical features and watershed processes. forthis purpose, the hec-ras hydraulic model after doing sensitivity analysis and calibrationprocess was used to simulate the relation between dominant watershed processes and riverphysical factors for 37 reaches of this river. considering the standard error, level of confidenceand coefficient of determination, compared to simple linear models, second order (quadratic)and third order (cubic) models, exponential models were the most suitable ones to extract themathematical relation between geometrical characteristics and the related dominant processesin this river system.