ژيومورفولوژي لس هاي منطقه يلي بدراق شمال شرق استان گلستان، شمال شهرستان كلاله

Geomorphology of Yalibadragh-loesses Northeast of Golestan Province

The topography of earth surface is not always fix because erosion always acts on it Among the different kinds of erosions, the water erosions that works on the slopes is very important . Based on this, the most important emotional outcrops and the affecting- factors on forming and strengthening of different kinds of erosion are recognized in this paper. The aim of this study is to introduce the strategy of control and combating the erosion in the study area. For this purpose the topographic maps, landsat images ( ETM Plus ) of the year 2002 , GIS and ILWIS software were used to recognize the geomorphological characteristics and erosional outcrops and the relationship between them from the point of view of correlation and making regressive correlation. So form , slope, slope orientation, the amount of precipitation, vegetation tpe, and the land use in the loess territory as the independent variables and each one of water erosion including sheet erosion, rill erosion , gully erosion, valley erosion and finally rock outcrop as the dependent variables were considered. The results show that, the geomorphological characteristics of loess territory in the past, in the future too. Considering the change of misland use by human beings and the reduction of vegetation cover especially reduction of density leads to the strengthening of water erosion and forming and spreading of different kind of erosional outcrops especially gully erosion and the increasing the immensity of rock outcrop in the study area, so that this leads to the clear change of the su^tion of the slopes in the loess territory.