بررسي عملكرد فرايندهاي يخچالي با استفاده از تحليل آماري قطر سنگ‎هاي سرگردان (مطالعه‎ي موردي: روستاي اسلاميه (فراشاه)، شهرستان تفت)

Survey of Glacial Processes Function Using of Statistical Analysis Wandering Rocks Diameter (Case Study: Eslamieh(Farashah) Village, Taft township)

اين پژوهش تلاش دارد با استفاده از روش‎هاي كمّي و مدل‎هاي آماري به اين پرسش پاسخ دهد كه آيا فرايندي غير از فرايندهاي يخچالي، اين چشم‎انداز رابه‎وجود آورده است؟ با توجه به نتايج پژوهش حاضر، وجود اختلاف معنادار بين ميانگين قطر ذرّه‎هاي زبانه‎هاي يخچالي، مويد تفاوت معنادار در توان هر زبانه است، به‎گونه‎اي كه نتايج آزمون دانكن زبانه‎ها را به سه گروه مختلف تقسيم‎بندي مي‎كند. گروه اول شامل زبانه‎هاي 3، 4 و 5، گروه دوم شامل زبانه‎هاي 1، 3 و 5 و گروه سوم شامل زبانه‎هاي 1 و 2 است. با توجه به‎اندازه‎ي ميانگين قطر سنگ‎ها در گروه سوم، مي‎توان نتيجه گرفت نيروي فرايند يخچالي در زبانه‎هاي گروه سوم بيشتر از دو گروه ديگر بوده است. همچنين آزمون مقايسه‎ي ميانگين‎ها، آثار پنج زبانه‎ي يخچالي موجود در منطقه را در سه گروه قرار مي‎دهد يعني اينكه بر پنج زبانه‎ي موجود در منطقه،سه وضعيت حاكم بوده است. از سوي ديگر، عدم وجود اختلاف معنادار بين مقاطع، حاكي از يكنواخت بودن ميانگين قطر سنگ‎هاست؛ يعني هيچ اختلاف معناداري بين قطر سنگ‎ها در مقاطع مختلف به فواصل مختلف در طول بلوك‎ها (زبانه‎هاي يخچالي) وجود ندارد. يعني اينكه هيچ‎گونه جورشدگي روي سنگ‎ها اتفاق نيفتاده است كه بتواند آرايش تصادفي حاصل از فرايند يخچالي را تغيير دهد. پس با قطعيت مي‎توان اظهار داشت كه پس از وقوع فرايند حاصل از ذوب يخ،فرايندي بزرگتر از فرايند يخچالي رخ نداده است. بنابراين فرضيه‎ي رخ دادن سيلاب‎هاي بزرگ بعد از دوره‎هاي يخچالي در منطقه‎ي مورد مطالعه، قطعي نيست.

Introduction Glacier impacts are the most important evidence that climate change Quaternary period. That Geomorphological phenomenon in the Earthʹs crust on the outer surface are left. Because they can be reconstructed past climate (Ramesht and Kazemi, 2008: 1). Central plateau of Iran, has dry to very dry conditions. Geomorphologic evidence shows significant changes in climate and natural conditions of the region occurred during the Quaternary. The situation today is very different from that sometimes. Evidence remains of the Quaternary period, such Syrkhay glacier, river and lake terraces, alluvial fans, and fossilized ... , show the Quaternary climatic changes. Glacialmorans geomorphologic effects, which are seen in the study area. However, results of studies on glacial forms, has had important results. Quantitative measure rarely used and ever the results classic approach is used in the formation of these forms. This study attempts to use quantitative and statistical models to answer the question whether the process has existed except glacial processes in creation of this landscape? Study area Village Frashah (Islamieh) is a village of Taft township. In 30 kilometers center of Yazd is located in West Shirkooh. The average height of 1750 meters. Location morons are the West and South west is Frashah village. The region is between 54? 3ʹE to 54? 5ʹ E and 31? 42ʹ N to 31? 43ʹN. Methodology For sampling, each of the 5 sections of 5 terminal rocks was considered equal intervals. Then three diameters of total stones in this section are measured with a meter and the average diameter was calculated for each stone. Then Using ANOVA, the differences between the mean diameters of stones in different treatments was tested. Then use the Applying LSD test post hoc multiple comparisons, were cleaned different groups of blocks (of glacier tongues) and treatments (sections) based on the mean diameter of the stones. Results and Discussion Results of Applying LSD test post hoc multiple comparisons Moran diameter with use of Dun Kan test show that the tabs are placed in three groups. The first group includes blocks, 2, 4 and 5, the second group consists of blocks 3, 5 and 1, and the third group consists of blocks 1 and 2. Also, Results of Applying LSD test post hoc multiple comparisons Moran diameter with use of Dun Kan test shows that the mean morans diameter different blocks in a group and not different from each other. Conclusion According to present research results, significant differences between the average particle diameters of glacial tongue confirmed a significant difference in each tab can be so the results of Duncan test into divided into three different groups described in Table (3) to classify. The first group includes tab 3.4 and 5, the second group includes tabs 1, 3 and 5 and the third group includes tabs 1 and 2. Considering the average size in the third group can be concluded third group has more power than the other two groups respectively. Also, the comparisons of test results the division five into three groups shows the dominant of three groups on five tongues. On the other hand, the lack of significant differences between levels show to be uniform (equal) mean rocks diameter in different levels in different intervals during the blocks (glacial tongue).It can be interfered that no sorting has happened on the rocks caused the random arrange resulting from glacial process. So we can with certainty say after the occurrence the process from melting, no process happened larger than glacial process. Thus the hypothesis of big floods occurred after the glacial periods in the study area is rejected.