![]() Also, the gully head advancement was estimated and compared among them by different empirical equations. Thus, the present research attempts to assess gully evolution using only two digital aerial photographs of different periods (19) and field assessment (2009) to estimate the gully head advancement based on frames geometry and rigorous procedure in southwestern Iran. Studies of gully development require constant monitoring activities which are not possible in not-well-explored areas, such as the arduous region of Iran, due to costs and a lack of geoinformation. Once started, gullies can continue to move by headcut retreat, or slumping of the side walls. Gully erosion is considered one of the major issues of land sustainability because it can remove considerable volumes of sediment and productive soils.
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