راهله
هاتفی
کارشناس ارشد، گروه زمینشناسی محیطی، پژوهشکده علوم پایه کاربردی
author
مرتضی
خضری
کارشناس ارشد، کارشناس سازمان زمینشناسی و اکتشافات معدنی کشور
author
کمال
خدایی
استادیار گروه زمینشناسی محیطی، پژوهشکده علوم پایه کاربردی
author
علی اکبر
شهسواری
استادیار گروه زمینشناسی محیطی، پژوهشکده علوم پایه کاربردی
author
سروش
مدبری
استادیار پژوهشی گروه زمینشناسی، دانشکده علوم، دانشگاه تهران
author
فرهاد
اسدیان
کارشناس ارشد، گروه زمینشناسی محیطی، پژوهشکده علوم پایه کاربردی
author
text
article
2016
per
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
2
no.
2016
1
20
https://esrj.sbu.ac.ir/article_95915_34cdfee1c246285f92d86e42f643154a.pdf
زهرا
ظهرابی
کارشناسی ارشد چینهشناسی و فسیل، گروه زمینشناسی، دانشکده علوم، دانشگاه اصفهان
author
حسین
وزیری مقدم
استاد گروه زمینشناسی، دانشکده علوم، دانشگاه اصفهان
author
علی
صیرفیان
استاد گروه زمینشناسی، دانشکده علوم، دانشگاه اصفهان
author
علی
رحملنی
شرکت ملی مناطق نفتخیز جنوب
author
text
article
2016
per
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
2
no.
2016
21
41
https://esrj.sbu.ac.ir/article_95949_0fc1a5f78145803b9c524b66645d662f.pdf
Structural and kinematic analysis of region between Mosha fault and North Tehran fault
مهیا
شیرمحمدی
دانشگاه شهید بهشتی
author
سید احمد
علوی
دانشگاه شهید بهشتی
author
محمد رضا
قاسمی
سازمان زمینشناسی ایران
author
محسن
احتشامی
دانشگاه شهید بهشتی
author
text
article
2016
per
In this research the Mosha-Lavasan region (southeast Central Alborz) which covers Northwest part of east Tehran geological 1:100,000 map area were investigated. With structural studies were determined four classes based on their direction and according to the tectonical`s venture of Central Alborz region, their productive tensions was coincided on the study area. The four classes are: 1- reverse faults and folds with the trending E-W, 2- right lateral strike slip faults that have been associated with ESE-WSW folds, 3- Thrust and folds with SE-NW direction and 4- normal faults with N-S to NE-SW trending. We combine satellite photos, seismic data, result of morphotectonic studies and field observation for representation a model that showed sinistral movements of Mosha, North Tehran and Ushan faults caused of the area between their rounded clockwise. This rotation is clearly recognized in direction of folds.
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
2
no.
2016
42
55
https://esrj.sbu.ac.ir/article_95958_cf28193b82a50fd8e13b254c52d6864f.pdf
Effect of climate models uncertainty on groundwater water table changes prediction
همت
سلامی
دانشگاه بهشتی
author
حمیدرضا
ناصری
دانشگاه بهشتی
author
علیرضا
مساح بوانی
پردیس ابوریحان، دانشگاه تهران
author
text
article
2016
per
With respect to climate models uncertainty, the output of 16 climate models have been used to predict groundwater table in future (2015-2045) in this research. Different climate models are weighted in the basis of their ability in predicting monthly observed climate data in the base study period (1970-2000). With respect to climate models weights and their predictions, precipitation and temperature changes in 10, 50 and 90 probability percentile are estimated. Daily observation data of Hamadan synoptic station and Δp, Δt under A2 emission scenario at different probability percentile have been imported to an stochastic weather generator, named LARS-WG, and future precipitation and temperature data are produced for the study period (2015 – 2045). Using precipitation data and runoff which estimated by artificial neural network, groundwater fluctuations have been predicted for different level of risk in future. Based on observed data, annual depletion of groundwater table in Hamadan-Bahar aquifer is about 0.72 m and this amount will be change to 0.53 m, 1.1 m and 1.3 m in 10, 50 and 90 probability percentile respectively. The aquifer saturated thickness is 50 m and it will be dried in near future
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
2
no.
2016
56
69
https://esrj.sbu.ac.ir/article_95968_b9de996835a2a2a47e1d4cdbe071f700.pdf
Reconstruction of the paleo morphometry dam lake Due to the occurrence of kabir kuh landslide (case study: jaydar lake
سیامک
شرفی
دکتری ژئومورفولوژی و پژوهشگر جهاد دانشگاهی، واحد لرستان
author
مجتبی
یمانی
استاد جغرافیا طبیعی(ژئومورفولوژی)، دانشکده جغرافیا، دانشگاه تهران
author
مهران
مقصودی
دانشیار جغرافیا طبیعی(ژئومورفولوژی)، دانشکده جغرافیا، دانشگاه تهران
author
text
article
2016
per
Land slide event in alluvial environments as proper substrates for formation of ancient settlements, causes Environmental changes such as the formation of Daming Lake. Kabir kuh Land slide as the world's largest land slide has blocked the Kashkan River and formed Jaydar Lake. With regard to the impact of formation of Jaydar lake on the pattern of ancient habitat during the Holocene, reconstruction of morphometric characteristics of Jaydar Lake in environmental and archaeological studies is necessary. Field-analytical method and various tools such as maps geology, topography, satellite imagery, GPS and spatial analysis software, such as Arc GIS and etc are utilized to determine parameters such as size, volume of water and sediment, maximum depth, average depth, shoreline development and the stability of the lake. The results show that because of the remnants of the lake sediments, Jaydar lake area is about twice larger than what geological map and previous studies has pointed out. Also, regarding the remains of sediment on the lake, which represents 4 hot and 4 humid periods and annual sedimentation amount and thickness of sediments, it can be said that Jaydar lake lifetime has been more than 2000 years and in about 5000BC(middle Holocene) is discharged. Other parameters also indicate sustainability of the Lake in a long time in this part of the Kashkan basin
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
2
no.
2016
70
87
https://esrj.sbu.ac.ir/article_95974_25fc7b295dc6568384a80d86346bf2c1.pdf
همت الله
رورده
دانشگاه مازندران
author
یدالله
یوسفی
دانشگاه مازندران
author
جمال
قاسمی
دانشگاه مازندران
author
text
article
2016
per
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
2
no.
2016
88
100
https://esrj.sbu.ac.ir/article_95987_0289dc633452af098a2fa3d88a66bc22.pdf
Edaphic variability impacts on spatial dynamic of arid ecosystems
ندا
محسنی
دانشجوی دکتری ژئومورفولوژی، گروه جغرافیا، دانشگاه فردوسی مشهد
author
عادل
سپهر
دانشگاه فردوسی مشهد- دانشکده منابع طبیعی و محیط زیست
author
سیدرضا
حسین زاده
دانشیار گروه جغرافیا، دانشگاه فردوسی مشهد
author
محمود رضا
گلزاریان
استادیار گروه مهندسی بیوسیستم، دانشگاه فردوسی مشهد
author
text
article
2016
per
Arid and semi-arid ecosystems due to lack of diversity in their structures and variables are prone to rapid degradation of vegetation composition in response to environmental changes. Processes and disturbances with subtle changes of the soil current patterns can result in the emergence of large scale dynamics across landscape. Occurrence of diffuse heterogeneities in soil attributes and consequently variations in vegetation patches can be a sign of the emergence of alternative stable states (as uniform vegetated and barren states) in arid ecosystems. Such contrast in distributions of vegetation and soil patterns may result in activation of positive feedbacks between soil-vegetation which have main role on the arid landscapes dynamics. Increasing positive feedbacks with decreasing system’s resilience lead to irreversible transformation onto degraded states. Since information on the soil-vegetation feedbacks can promote our understanding of how arid landscape responses to external stresses, in this paper has been noted impacts of positive feedbacks in evolution trends of arid ecosystems. Here has been shown that how the emergence of heterogeneities on the landscape dominant soil with occurrence of positive feedbacks between soil-vegetation can result in decreasing resilience and intensification of desertification trends.
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
2
no.
2016
101
116
https://esrj.sbu.ac.ir/article_95925_4b2deef83af75a44ae62b28ef08872c4.pdf
Determining of Siberian High Tongues toward Central Iran during Critical Colds
غلامرضا
براتی
استادیار، دانشکده علوم زمین، دانشگاه شهید بهشتی
author
محمود
احمدی
استادیار، معاون فنی و شبکه ایستگاههای هواشناسی کشور، تهران
author
ابراهیم
میرزایی
دانش آموخته کارشناسیارشد آب و هواشناسی دانشکده علوم زمین، دانشگاه شهید بهشتی
author
محمد
بیتار
دانش آموخته کارشناسیارشد آب و هواشناسی دانشکده علوم زمین، دانشگاه شهید بهشتی
author
text
article
2016
per
Central Iran hasn't the extent resources such as water bodies and dense plant cover that can modify temperature challenges. It is known as arid and semi-arid land that is frost-prone especially during winter. In this research we try to determine the atmosphere level of cold air flows from the basin of Siberian High toward Central Iran. Thus we extracted the zero and under zero temperatures as daily maximum temperatures from 8 weather stations including Shahrood, Tehran, Semnan, Kashan, Isfahan, Yazd, Kerman, and Bam Cities during 1980 to 2012. Therefore, we determined 47 CAWs and we used two index including ≥ 2 days duration and observing CAW in ≥ 2 stations and finally it was determined 17 CAWs as critical colds over central Iran. Converting the data of up level filed from compact format (.nc) to text one (.txt) and air mapping finalized to synoptic pattern. Our principal results appeared in 1000HPA isobaric surface as the ideal surface for the modeling of pressure changes in low atmosphere. The pattern of outermost and closed contour and so, the pattern of outermost and effective one showed respectively the apparent and non-apparent presence of Siberian High during in the most critical colds of Central Iran. For some critical colds, we found migrant highs over Europe and north of Caspian Sea in 750, 500 and 300 HPA isobaric surfaces. Therefore, it seems Central Iran is the confluence of horizontal cold air flows from northeastern and vertical ones from northwestern
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
2
no.
2016
117
129
https://esrj.sbu.ac.ir/article_95932_536d80102db1f68303abef6b6ebdd84c.pdf
جمیله
توکلی نیا
دانشگاه شهید بهشتی
author
سعید
ضرغامی
دانشگاه شهید بهشتی
author
پرویز
آقایی
دانشگاه شهید بهشتی
author
text
article
2016
per
Researches in Earth Sciences
Shahid Beheshti University
2008-8299
7
v.
2
no.
2016
130
145
https://esrj.sbu.ac.ir/article_95943_b885130af7d0dfaa9d98b7b9fd3f2ff2.pdf