The Study and analysis of geometrical variations of longitudinal and cross profiles of Qaresou River during 1954-2014

The plan of a river shows many geomorphological and dynamic characteristics of the river. In fact, the longitudinal and cross profiles of the river and especially the rate of its concavity depends on different parameters such as centralization of discharge material gathered from the drainage network to the main channel of the river, erosion of channel, litho logy, topography and tectonic factors of the basin. clearly by changing these parameters, the plan of the river will changes. The goal of the research is analyzing geomorphological changes of longitudinal and cross profile of Qaresou River during 1954-2014. At first, due to high length of the river( about 400 km) , the river was divided in to five segments and then for drawing the longitudinal sections of the river, satellite photos of PAN IRS, elevation model ( DEM), topographic map of the area 1:50000 and Arc Gis map were used. Findings show that the longitudinal profile of Qaresou river is relatively regular and uniform, which has multitude meanders. Also, the general form of the Qaresou River is concave and has diverted toward the downstream than primarily origin in a way that its diversion rate will reach to 50 degrees at the fifth segment . Also from the view point of latitudinal profile, the river has had a reducing trend within the last 60 years ago. During this time period, the most rate of change has been observed in segments 2 and 5 . Results show that the river tendency is toward the increase of sedimentation and decrease of erosion in the most parts that shows the steady state equilibrium of the river .