Study of Quaternary Landforms Glacial Hamedan mass with an Emphasis on Different Parts of the Circus

The most land forms of Iran highlands, is very similar to glacial Cirque. The current the height permanent boundary snow are above of the highest mountain peaks in this regions. In all studies of the Quaternary ice ages, special attention has been to determining the height permanent boundary snow, identified on the basis absolute height Circus floor. The mountains Alvand in Hamedan to over 3,500 meters height and latitude 34.5 degrees north, have many circus forms, that these suggests the Quaternary glacial activity. The height permanent boundary snow masses, be estimated with two methods Wright and slope- direction. Several studies field suggest that accumulation of snow near the wall the circus has more robust in facing. Accordingly, in this article, pay special attention to how to determine the height of the circus floor, according to the distribution of contour lines of the peaks to the foothills, in order to determine the height of the slope to the floor of the circus and the estimation of height that more than 60 percent of circuses has higher than its, such changes have been made to estimate the height permanent boundary snow. The height such of change is different in range of the slope of Nesar and slope of Negar, resulting the height permanent boundary snow is different. This height be estimated by method slope- direction on bases three factors latitude, slope amount and slope direction, that these confirm the above.