چکیده:
Wind erosion is a major environmental issue affecting land resources and socio-economic settings in Iran. This paper
outlines a study undertaken to provide a new tool to manage wind erosion from physical and economic perspectives. The
southern part of the Varamin Plain in south of Tehran is used as a case study. The focus of this study is on exploring the
economic and physical impacts of 16 vegetation-based scenarios for wind erosion management as well as conducting a
trade-off analysis using the Multi-Criteria Decision Making (MCDM) technique. This involves developing a modeling
system to assist decision makers in formulating scenarios, analyzing the impacts of these scenarios on wind erosion, and
interpreting and suggesting appropriate scenarios for implementation in the area. The Iran Research Institute of Forests
and Rangelands (IRIFR.1) model has been selected to create the wind erosion hazard maps for the present condition and
for the possible vegetative management scenarios. The Spearman’s correlation coefficient indicated a high conformity
between the hazard classes of wind erosion map predicted by the IRIFER.1 model and ground evidences. Using the
Delphi method weights of wind erosion, gross margin, and establishment costs indices have been determined 0.5, 0.3, and
0.2, respectively. This indicates the high importance of wind erosion issue from experts’ consideration. Standardization
and trade-off analysis of indices showed that a scenario with a combination of all possible management actions ranked as
the best scenario (highest score) despite incurring the largest establishment costs. On the other hand scenarios with single
management actions resulted in lowest scores. Finally, the sensitivity analysis of the chosen modeling approach in this
study indicated the robustness of the results.
خلاصه ماشینی:
The focus of this study is on exploring the economic and physical impacts of 16 vegetation-based scenarios for wind erosion management as well as conducting a trade-off analysis using the Multi-Criteria Decision Making (MCDM) technique.
1) model has been selected to create the wind erosion hazard maps for the present condition and for the possible vegetative management scenarios.
Standardizationand trade-off analysis of indices showed that a scenario with a combination of all possible management actions ranked as the best scenario (highest score) despite incurring the largest establishment costs.
Literature review indicates that development and implementation of vegetation-based management actions and scenarios usually decrease the rate of wind erosion in arid areas (Armanino et al, 2000; Rhode et al.
Therefore, in this study it is aimed to recognize various possible vegetation management actions across the area and to predict the probable impacts arising from implementing different vegetation- based management scenarios in order to find out best management scenarios alleviating or controlling wind erosion and desertification intensity in the southern parts of the Varamin Plain.
According to the IRIFER model, the differences observed in the wind erosion hazard maps of the management scenarios are due to the changes in two input parameters of vegetation density and land use type.
The establishment costs across 16 management scenarios To quantify the physical index, the wind erosion hazard maps corresponding to various scenarios were used.
Based on this approach the weights of wind erosion (physical index), gross margin, and establishment costs (economic indices) have been determined to be as 0.