نوع مقاله : مقاله پژوهشی
1 دانشجوی دکتری ژئومورفولوژی، دانشکده علوم جغرافیایی و برنامه ریزی، دانشگاه اصفهان.
2 دانشیار گروه جغرافیای طبیعی، دانشکده علوم جغرافیایی و برنامه ریزی، دانشگاه اصفهان
عنوان مقاله [English]
The shape of the cirques is a reflection of topographical and geological factors, the type and duration of the effects of the glaciers. To accurately identify glacial cirques, the exact consideration of the size and shape of these forms, it seems necessary to use modeling and mathematical and morphometric relationships (morphometry) for geomorphologists. Morphometric studies of glacial cirque are a new technique for quantitative study of cirques in relation to various environmental factors. Morphometric and almetric surveys of glacier landforms help to better understand the characteristics of long-standing glaciers. The purpose of this study is to analyze the morphometric parameters of glacial cirques, their classification in terms of degree of evolution, the impact of various factors (geological, topographic and climatic factors) on their development in the mountain Jupar.
To Identification the classification and morphometry of the glacier cirques of Jupar altitudes in Kerman province, glacier cirques of 7 submerged basins, based on a digital elevation model and its adaptation to a gradient map classified in the software environment of 91 freshness cirques in the study area Identified and drawn. Then, fitting the power models on the longitudinal profiles of the cirques, extracted the coefficients and statistical parameters of the cirques in the region. For morphometry of these circuses, parameters such as (L), (W), (H), (L / W), (L / H), (W / H) and cirque size was used. Is. For the classification and classification of cirques, the Wilburg and Rudberg, Evans and Cox methods have been used. In the Wilburg and Rudberg methods, cirques are classified into five categories: N-1, N-2, N-3, N-4, N-5 Was ranked. According to the Evans and Cox rankings, the cirques are divided into five groups, classical, good and developed, definite, weak, and boundary. For alometry and isometric measurements, the cirques of the mountain Jupar of fitted power models have been used.
Based on geomechanical techniques and new methods for determining the glacier cirques, 91 glacier cirques were detected in the Jupar Altitudes Identified and drawn. According to the Wilburg and Rudberg 8, the circus is equal to 8.79% of the total number of cirques in N2, 33 cirques are equivalent to 36.26% of the total number of cirques in N3 and 15 cirques, equivalent to 16.48% of the total cirques. N4. The minimum size of cirques in the category N2 and N3 is 706 and its maximum is 1527 meters. The mean longitudinal axis of the cirques is 645 m with a coefficient of variation of 19.42 m and the mean axis of the cirque is 5770.5 m with a coefficient of variation of 76.65 m. The average length to width ratio of N4 and N4 cirque peaks is 1,1713 feet, indicating the length of the cirques in this category. The coefficient of variation of the longitudinal axis of the cirque is 23.27 m and the coefficient of variation of the lateral axis of the cirque is 27.23 m. Unlike the N2 and N3 cirques, these cirques have little variation in the direction of the transverse axis. The average height of the circus is 343.9 m. The lowest level of cirques in the category N4 and N5 Mountains is 623.3 m and its maximum is 1578.7. The average range of cirques changes in the category of N2 and N3 is higher and their coefficient of variation is higher. Average ratio of cirques length to floor height is 1583/0 m. The average width to depth (floor height) is 136 m. The volume of ice in these cirques is not so great that it can deepen the depth of the cirques. As a result, the depth of the cirques in the N4 and N5 regions is low and the volume of snow and ice storage in these cirques is low.
The mean longitudinal axis of the cirques of the N2 and N3 categories is 645 m with a coefficient of variation of 19.42 and the mean of the transverse axis of the circus is 5770.5 meters with a coefficient of variation of 76.65 meters. The average length to width of cirques is 1/141 m with a change coefficient of 84.8 m. The cirques of this category extend in a longitudinal direction. The average length to width ratio of N4 and N4 cirques peaks is 1,1713 feet, indicating the length of the cirques in this category. The coefficient of variation of the longitudinal axis of the cirques is 23.27 m and the coefficient of variation of the lateral axis of the cirque is 27.27 m. The height of the cirque of the N2 and N3 range varies from 2814 to 3888 meters. The average width to depth (floor height) is 170.0 m. The average length of cirque length is up to 192.0 m. The average floor height of the cirque of the N4 and N5 is 3334.3 m. Average ratio of cirques length to floor height is 1583/0 m. The average width to depth (floor height) is 136 m.In cirques N2 and N3, the longitudinal coefficient of the cirques is B 1. The result of an almetric study of various cirques in this area indicates that the cirques behavior of the region is not consistent with other glacial regions of the globe. The cirques in this area were not primarily glacier cirques or glacier erosion did not play much role in their formation.