Morphometric study of landslide monitoring using remote sensing (Case Study Hardang Village South West Isfahan Province)

Landslide is one of natural hazards that cause fatality, compensation and natural resources damages. By combination of natural and human factors, the event of geomorphic transport processes is occurred by instability condition of hillside. The aim of this study was to Morphometry and determining heave and evaluating changes of an old active landslide in Hardang area which is located 75 kilometers from southern west of Isfahan Province. Various types of hillside instability have been seen in the region, and one of the giant heave is a coluvial near the Hardong village which has been greatly threatening the village. Investigation of Morphometry of the phenomenon and determining the mechanism of these heaves will guide us to control and prevent risks. To assessing the land slide, the scale of heave was determined using aerial photographs of the two periods in 1334 and 1370. Then, the landslide scale at the present time was determined using field works, Google Earth and GIS software. The changes of land slide can be evaluated by comparing the size and volume of the landslide. The results of this study indicates that average heave of this land slide in duration of 56 years was about 32/837 centimeters in year and differences in length, width, perimeter, area and volume of this landslide since 1334 to 1390 the upside is increased (respectively, from 18/389 to 885235/316 cubic meters) indicates that the rotational motion is translational landslides during these years.