Mina Jafari; Mohammad Reza Ekhtesasi; Ahmad Fatahi Ardakani
Abstract
Today, various watershed management projects are being implemented in watersheds which sometimes, despite high study and cost, they are inefficient for various reasons and face economic failure. In the present study, first, different watershed projects in the Parcel A of Gheshlagh Dam in Sanandaj were ...
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Today, various watershed management projects are being implemented in watersheds which sometimes, despite high study and cost, they are inefficient for various reasons and face economic failure. In the present study, first, different watershed projects in the Parcel A of Gheshlagh Dam in Sanandaj were evaluated. Then, their evaluation was examined by determining internal and external factors. The aim is to extract the most important factors and provide strategies that make projects economically viable and functionally effective. Weaknesses, strengths, opportunities, and threats of the region were extracted by experts and, using the SWOT analysis model and quantitative matrix of QSPM, economic-applicable solutions were presented. Results showed high value of management factors, so that the highest final value in external factors was inefficient study projects and the lack of funds for maintenance and repair of projects after implementation with scores of 0.50 and 0.43, respectively, and internal factors had the highest final value related to destruction and burial of dams due to the low quality of construction with a score of 0.59 which had the most impact on strategy selection. Based on the results of the model, the strategies are located in the ST quarter and are of a conservative method, in order to reduce the damage caused by threats and weaknesses by using the strengths of the domain. In accordance with this strategy, solutions were given by experts and prioritized by the quantitative matrix QSPM. The implementation of projects on land owned by individuals or the assignment of the right to maintain them to the owners with a final score of 8.76 was ranked first. The results of this research in the present economic situation of the country are very useful for informing authorities about how to optimize the implementation of watershed projects and will improve the instructions and implementation and the best use of projects.
Masoumeh Sadeghi; Mostafa Karimi Ahmadabad; Mohammadreza Ekhtesasi; Mohammadreza Rajabi
Abstract
Sand transport by erodible winds is one of the most important wind processes in arid and semi-arid regions. In this study, in order to determine the wind regime, different indices of same wind aspect index (UD), sand transport potential index (DP), erodible winds direction resultant index (RDD), transport ...
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Sand transport by erodible winds is one of the most important wind processes in arid and semi-arid regions. In this study, in order to determine the wind regime, different indices of same wind aspect index (UD), sand transport potential index (DP), erodible winds direction resultant index (RDD), transport potential resultant index (RDP) were studied and compared with sand dunes morphology index in Semnan Plain. Garmsar, Semnan, Damghan and Biarjomand synoptic stations anemometer data and sand rose graph software were used to analyze wind data, sand transportation potential and sand rose drawing. Results showed that wind sand transportation potential is relatively high at all studied stations and more than 3000 vector unit(VU) throughout the year,according to six m/s threshold velocity which presents highly potential of wind erosion and sand transportation in the region. Annual (UD index is more than 0.9 in Damghan station and varies between 0.3 to 0.8 in other stations. RDD index is also reflecting wind direction changes from 130 to 180 degree. These two indices are representing barchan sand dunes, barchanoid and or silk shape longitudinal dunes in Semnan_Garmsar plain that are formed along north-northwest to south-southeast winds. This condition show the close adaptation with Alborz mountains cold and high pressure condition at the north part of the region and southern situation of Gramsar, Damghan and Semnan plain and also with topography pathway of the region. Sand dunes moving index shows that they are moving and their current vegetal coverage is the result of de-desertification activities.
