Investigation of the Effect of Earth Environmental Factors on Initiation and Expansion of Gully Erosion by using Geographical Information System (Case Study in Temer Ghareh Ghozi, Kalaleh, Golestan Province)

According to the importance of loss areas, which have embarrassed a wide region of Golestan province and its important role in formation of the sediment of Gorgan river, more accurate recognition of types of loss erosion seems essential in order to providing necessary function for erosion and sediment problems in them, specially gully erosion. So, in this study we are going to providing regression model through investigation of effective earth environmental factors on gully erosion to identify gully initiation mechanism on loss land. For this, locational situation of the gully (Temer Ghareh Ghozi region) was identified after recognizing airy photos in the scale of 1:20000 and basic study as climate, geology, soil, herbal coverage, land function, and topography began after providing unit topography by using geographical information system. In order to control the effect of herbal coverage on initiation of gully erosion, we work to remove density of herbal coverage by 1*1 square meter plots. Finally, a proper regression model was offered to develop gully erosion, after recognition and computation the relationship between environmental earth factors with initiation, growth and development of gully erosion through multi-variable analysis by using SPSS. The result shows that earth environmental factors such as height, slope, and aspect, height of hillside, annual rainfall, stone units, land type and density of herbal coverage have an effective role in initiation and expansion of gully erosion in loss land.