Investigating the Processes of Mountainous Regions Using Contour Lines Curvature Coefficient (Case study: Hamedan Alvand Batholith)

Alvand batholith is located at thr  South, south East and west of Hamedan with the North West- South East direction. Mountain valleys are formed by initial structure, tectonic and geomorphologic processes of erosion over time. Result of geomorphology processes has impacted the form of counter lines during the quaternary. The contour lines curvature coefficient has obtained from dividing the spatial distance to real distance of counter lines in 1/50000 topography map. The number of contour lines curvature coefficient can show the long-term effects of influencing factors. To achieve this purpose the study area was divided into 28 sub-basins. Morphometric parameters of curvature coefficient were estimated in four basin group according to the highest peaks (3500, 3400, 3200 and 2800). The linear Relations were calculated between the curvature coefficients and the height of contour lines. Subsequently, the calculated coefficients were evaluated in relation to direct of slopes. In the beginning the amounts of Curvature coefficients had a descending process from peak to valley afterward this process has begun to ascend near the mountains front sinuosity. Such changes have showed the glacier process transition to the sub-glacier process. Due to the mountains sinuosity differences in the north-east and south-west slopes of Alvand batholith, the lowest amounts of Curvature coefficients in the north-east slopes have higher elevation than the south-west slopes, whereas the curvature coefficient are lower in number in north-east slopes. These results have shown the influence of elevation and slope direction on the amount of Curvature coefficients. Additionally glacier processes have had more impact on north-east slopes than south-west slope.