Seyyed Asadollah Hejazi; shabnam mahmoodi
Abstract
Abstract[1]
One of the most important erosion processes in desert areas, including the study area (east of Jask city), is wind erosion, which leads to various erosion forms, including sand dunes. The importance of studying the sand dunes in this area is due to the fact that, these hills, if moving, ...
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Abstract[1]
One of the most important erosion processes in desert areas, including the study area (east of Jask city), is wind erosion, which leads to various erosion forms, including sand dunes. The importance of studying the sand dunes in this area is due to the fact that, these hills, if moving, bring damages to the natural resources, human facilities and so on.Therefore, studying sand dunes is important in managing these areas. One of the first features that is studied in most researches related to desert areas, including wind erosion, routing the motion of the sand dunes, etc., is a feature related to the texture of sand particles.Therefore, in the present study, the textural characteristics and deposition environment of sand sedimentation have been investigated.The study area is part of the desert coast and is located east of Jask city and in Hormozgan province. This research is based on the sample collection of the site and the study of sedimentary texture using the results of granulometry and microscopic and macroscopic examination of sediments after preparation.To calculate the textural parameters such as the mean, sorting and bending, the instantaneous method was used and the charts were prepared using Excel software. The maps were prepared using topographic maps and satellite imagery in GIS software. A geological map was also used to study lithology. The results indicate the closeness of the mean diameter of the grains and indicate the lack of energy fluctuation in the sedimentation environment. Negative bending, good sorting, the presence of marine fossils and the presence of transparent grains in specimens 1, 2, 5 indicate coastal origin for these specimens. Positive bending, good sorting, bimodal histogram curve and upward curvature of cumulative curves in samples 6, 7, 9, and 10 indicate the presence of flooding materials of the river and side sediment.Therefore, the river origin can be imagined for these samples.
[1] - به دلیل کیفیت نامناسب متن چکیده مبسوط انگلیسیِ ارائه شده توسط نویسنده مسئول مقاله، نشریه به ناچار اقدام به ترجمه مجدد متن چکیده فارسی و انتشار آن به جای چکیده مبسوط انگلیسی نموده است.
Mohammad Javad Ghaneie Bafghi; Alireza Yarahmadi
Volume 20, Issue 80 , February 2012, , Pages 57-61
Abstract
The main purpose of this article is to provide an indicator in addition to existing indicators for determining the direction of the dominant wind in the region (Arg-Hasan Abad of Bafgh). This indicator can be helpful in areas where other indicators, such as wind statistics for wind rose, satellite images ...
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The main purpose of this article is to provide an indicator in addition to existing indicators for determining the direction of the dominant wind in the region (Arg-Hasan Abad of Bafgh). This indicator can be helpful in areas where other indicators, such as wind statistics for wind rose, satellite images and aerial photographs are less available. In the implementation of this project, with the help of the statistics of Bafq synoptic station, the monthly, seasonal and annual wind roses were drawn. furthermore, the morphology of sand dunes was investigated using satellite images of the region and the total of the above activities were drawn upon to determine the dominant winds. Thereupon, the random network was applied onto the satellite image and the coordinates of forty points were extracted, which were approximately 500 meters apart. Using the GPS, the points were called upon and the sediment samples were taken. The specimens were screened and their cumulative graphs and diameter distribution were plotted in terms of fi and micron, and the mean, skewness and sorting factors were calculated with the help of the corresponding formulas. By drawing the diameter contour lines, it was found that there is a significant relationship between the dominant wind direction and the distribution of grain size in the area of Ark.