Monitoring GIS Analysis and Simulations of Natural and Anthropogenic Digital Terrain Change Impacts on Water and Sediment Transport in the Agricultural Farms

ISPRS Archives XXXVIII-8/W3 Workshop Proceedings: Impact of Climate Change on Agriculture

Mahmoud Reza Delavara and Nasser Najibi

“The research effort focused on the acquisition of new knowledge about the complex interactions that occur between natural processes and anthropogenic activities to improve current understanding of topographic and land cover change impact on landscape processes. The method has been developed for a comprehensive spatio-temporal analysis of sand dune evolution. First, a set of features that can be used as indicators of dune evolution was identified and methods based on surface analysis using principles of differential geometry developed. Specific thresholds for extraction of the features such as dune crests, ridges, slip faces and active dune areas were introduced. The proposed methodology can be used to assist quantifying various aspects of complex evolution of a sand dune field that included rotation, translation and deflation, evolution of new slip faces and transformation from crescent to parabolic dunes. Complex interactions between human impacts and natural processes were identified: the impact of a large number of visitors freely moving over the dune has proven to be minimal, on the other hand, the naturally expanding vegetation and urban development surrounding the dune that reduced the sand supply had a major impact. It appears that the combination of climate change and indirect human activities have more significant impact than the direct interaction. Quantification of dune evolution provided critical information for park management and selected results of the research will be included in the visitor’s center. The developed methodology is general and can be applied to other areas that include migrating sands providing valuable information for management of such areas and a range of additional applications.”