پديد آورندگان :
سالاري، نرجس نويسنده دانشجوي كارشناسي ارشد ژيومورفولوژي، دانشكده علوم جغرافيايي و برنامهريزي، دانشگاه اصفهان , , تقيان ، عليرضا نويسنده استاديار دانشكده علوم جغرافيايي، دانشگاه اصفهان , , ولي، عباسعلي نويسنده دانشيار دانشكده منابع طبيعي، دانشگاه كاشان ,
كليدواژه :
كوير سيرجان , فرسايش بادي , مورفومتري , ريپل مارك
چكيده فارسي :
مطالعه در مورد كيفيت و خصوصيات اشكال فرسايش بادي و همچنين ارتباط اين اشكال با ساير لندفرمها و پديده هاي موجود در محيط به عنوان يك معيار مهم و باارزش در ارزيابي شرايط منابع طبيعي به خصوص در مناطقي كه داراي حساسيت بالايي نسبت به فرسايش مي‌باشند ضروري مي‌نمايد. در بررسي ويژگي‌هاي اشكال فرسايش بادي استفاده از بعضي از پارامترهاي مرفومتريك مي توانند اطلاعات بسيار مهمي را از رفتار اين اشكال در محيط‌هاي مختلف ارايه دهند. اين پژوهش سعي در بررسي اختلافات موجود بين خصوصيات مورفومتري ريپل مارك ها به صورت طرح تصادفي در حوضه كوير سيرجان در سه موقعيت مكاني متفاوت، يعني در پناه تپه هاي طبيعي، در پناه پوشش گياهي و در سطوح هموار به صورت كمي اندازه‌گيري و مورد مقايسه قرار گرفت. فاكتورهاي مورفومتري مورد مقايسه ريپل مارك ها شامل طول موج ريپل مارك ها و ارتفاع موج ريپلمارك ها در موقعيت‌هاي مختلف يك مكان مي‌باشد. نتايج آناليز واريانس اختلاف معني‌داري بين پارامترهاي طول موج و ارتفاع موج ريپل مارك ها در موقعيت‌هاي مختلف را نشان مي‌دهد. در سطح احتمال خطاي كمتر از 1 درصد (01/0›?) نتايج آزمون مقايسه ميانگين‌ها براي هر يك از عوامل ذكرشده ريپل مارك‌ها را در سه گروه متمايز تفكيك مي‌كند. گروه اول شامل ريپل هاي در پناه پوشش گياهي، گروه دوم شامل ريپل هاي باد پناه تپه هاي طبيعي و گروه سوم شامل ريپل هاي سطوح هموار مي‌باشد. بنابراين مي‌توان با آناليز پارامترها نتيجه گرفت الگوي ريپلمارك هاي ماسه اي به شدت تحت تاثير شرايط محيطي تشكيل‌دهنده آن‌ها قرار دارند.
چكيده لاتين :
Introduction
Since many arguments for identifying appropriate indicators for rapid assessment of the extent of damage has been done in arid regions Using geomorphological indicators because they can be directly and quantitatively measure the erosion and sedimentation processes are of great importance. Ripple marks are the waves that are generated by the wind blowing sand onto the field. Identify the behavior as a form of ripple mark a dramatic effect on wind erosion and wind erosion control in different areas of knowledge will Properties of these waves is a function of several factors, including diet and wind barrier properties These are small pleat sizes and shapes are formed primarily by pressure ejection. Their wavelength is related to the wavelength of the projectile particles, are formed as a result of aerodynamic instability (Chorly et al 1384). Sand dunes ripple of the wind speed, friction free flow greater than the threshold friction velocity of sand led to uniform spaces are created And the free flow friction velocity exceeds a certain level, are disappearing. Ripple scale is proportional to wind speed (De Miao et al, 2001). Sand ripple popular forms of gentle slopes in areas of low flow unilateral appear by eolian (Howe and Humphrey, 1995:13). When the wind is blowing on the sandy bed of sand move will result in the formation of ripple mark (Mountney and Thompson 2002:5). Including obstacles that affect the characteristics of Nebkas, area of ripple mark, Nebkas, area deposits of wind that their situation has been stabilized by vegetation.
Sirjan salt desert is in the south western city Sirjan in located geographical coordinates 28° 46? and 29° 59? north latitude and 54° 57? and 56° 27? east altitude. Sirjan salt desert is one of the most deserts in Kerman. This wildernees area with 1,625 square kilometers of the basin in largest basin deserts of Isfahan that triangular shape of the fovea is located in the southwestern city of Sirjan. The study area in from south western to west of Sirjan belt to green belt located (klinsli D, 2002, 220).
Methodology
Used in this study Include descriptive methods are Attributive, Studies of field, Statistical Analysis, Regression analysis and Correlation between parameters.
Results and discussion
After reviewing the plan, in part because typical desert Ebrahimabad and qualify as a vector of sample sites were selected for field work The measuring site, factors such as the wavelength of ripple and ripple height specified distance proves randomly formed in the desired position, Then, geometric features such as ripple wavelength and height of analyzing data and Comparisons were. There was no significant difference in the position of spatial.
Conclusion
Study on morphological characteristics ripple mark as one of the forms of wind erosion compression impact on environmental management and planning in the areas of wind erosion will, Identify the behavior as a form of ripple mark a dramatic effect on wind erosion and wind erosion control in different areas of knowledge will, Properties of these waves is a function of many factors, including diet and wind barrier properties. The study concluded with parameters sand ripple pattern forming, they are heavily influenced by environmental conditions, According to calculations and results analysis, a significant difference between the parameters of the ripple wavelength and wave height at different locations, In other words we can say that the characteristic morphologic features Lndfrm, ripple effect on them is deployed.
