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:: Volume 35, Issue 4 (2020) ::
GeoRes 2020, 35(4): 343-354 Back to browse issues page
Reconstruction of the Least Phase Quaternary Climate Condition in Shahdad River Basin
Hosain Ghazanfarpour *1, Mohsen Pourkhosravani2 , Behnaz Sheykhshariati Kermani2
1- Department of Geography and Urban Planning, Faculty of Literature and Humanities, Shahid Bahonar University of Kerman, Kerman, Iran
2- Department of Geography and Urban Planning, Faculty of Literature and Humanities, Shahid Bahonar University of Kerman, Kerman, Iran, Kerman, Shahid Bahonar University , Department of Gography
Abstract:   (2106 Views)
Amis: Climate changes are the most dominant characters in quaternary period. The aim of this research was to reconstruct the least phase quaternary climate condition in Shahdad basin.
Methodology: At first the Wright and Porter method were used to access the last temperature and rainfall, and then the cirques and terraces were recognized based on the topography maps 1:50000 and digital elevation model of 30m.
Findings: The maximum and minimum of temperature and rainfall were 25°C and 5°C and 210 and 60 ml in the present time, as well as, 20°C and -20°C and 450 and 150 ml in the last time. The altitude of perpetual snow line was 2908 m in the Wright method by passing the line of 60% of the location of glacial circuses of Shahdad basin, 2849 m in the cirque-floor altitude method, 3018 m in the altitude ratio method, and finally 2850 m in the Accumulation-area ratio method. The average of these four methods was 2906 altitude. 104 circuses were identified, with the highest frequency of circuses at an altitude of 2700 to 2900 meters. Also, by reconstructing the lake terraces and establishing a connection between the co-altitude terraces, 5 terraces were identified, which were located at altitudes of 1000, 800, 550, 400, and 250 meters.
Conclusion: Although, today Shahdad basin has located in the dry climate area, but evidence has shown that this basin has glacial signs including glacial terraces, cirques and etc., and had lower temperature and more rainfall in the past. Therefore using the geomorphologic signs is a suitable method for reconstructing the old environment and climate during the last period of the maximum Expansion of glaciers
Keywords: : Climate Change, Shahdad River Basin, Wright and Porter, Circus, Quaternarynary.
Full-Text [PDF 1499 kb]   (737 Downloads)    
Article Type: Original Research | Subject: natural geography
Received: 2020/08/3 | Accepted: 2020/09/12 | Published: 2020/09/15
* Corresponding Author Address: Department of Geography and Urban Planning, Faculty of Literature and Humanities, Shahid Bahonar University of Kerman, Kerman, Iran
English Expanded Abstract [HTML 19 KB]  (1515 Download)
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Ghazanfarpour H, Pourkhosravani M, Sheykhshariati Kermani B. Reconstruction of the Least Phase Quaternary Climate Condition in Shahdad River Basin. GeoRes 2020; 35 (4) :343-354
URL: http://georesearch.ir/article-1-944-en.html


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Volume 35, Issue 4 (2020) Back to browse issues page
تحقیقات جغرافیایی Geographical Researches
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