Abstract

Alvand Mountains, located in the South, south East and west Hamedan with direction North West- South East. Alvand mountains valleys formed under the influence of the initial structure, tectonic and geomorphologic processes of erosion over time. Evaluates the changes in the form of valleys in a certain time interval, the data needs, that are either not measurable because of change low landforms, or measuring tools and equipment they need, that they are not allowed to install, but Quaternary processes affect overall outcome is reflected in the lines of curvature. By examining the curvature coefficient lines of curvature, can be traced back to the long-term effects of influencing factors. For this purpose, the study area was divided into 28 sub-basins. Morphometric parameters coefficient of the curvature was estimated in four groups' basin height of the highest peak (3500, 3400, 3200 and 2800). The linear Relations were estimated between the curvature coefficient with the height of contour lines. Then the situation of the estimated coefficients was evaluated in relation to unevenness. Curvature coefficients perigee altitude valley in the foothills of northeastern is higher and the coefficient of curvature is smaller than valleys in the foothills southwest Alvand Hamedan.