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:: Volume 2, Issue 4 (10-2014) ::
3 2014, 2(4): 59-77 Back to browse issues page
Zoning of Stone Weathering Processes in Tehran and Alborz provinces based on GIS
Abstract:   (16802 Views)

Introduction Weathering is defined as the “break down or alteration of rock in its natural or original position at or near the Earth̓ s surface through physical, chemical and biological processes induced or modified by wind, water and climate”(Reiche,1950). The two variables that define weathering are the Mean Annual Temperature and the mean annual precipitation. Together, these two variables can be used to define a regions weathering type. Peltier defined seven graphs using these two variables that described different types of weathering phenomena, they are chemical weathering, frost action, weathering regions, pluvial erosion, mass movement, wind action and morphogenetic regions. Tehran, Alborz provinces are located between latitudes 34 to 37˚ N and longitudes 50 ° to 53 ° E. The goal of this study is to create maps of the continental Teharan and Alborz for each of Peltierʾs graphs. Materials and Methods In this study for investigation the weathering and morphogenetic regions at Tehran and Alborz Provinces, datasets of mean annual temperature and mean annual precipitation, obtained from the website of Meteorology organization. About 42 stations which have appropriate data period (2000-2010) were selected. Then a database in GIS environment was created and the data were recorded in the GIS software. Then using peltiers model, DEM and Synoptic stations record and pluviometry, were identified weathering processes in the study area. Results and Discussion Due to the topographic position of Tehran and Alborz and also geomorphology, climate, urban users, there are spatial variations in weathering conditions. The purpose of this research is to identify it. Temperature and precipitation in the region is more dependent on latitude. Most precipitation is 750 mm per year. Minimum temperature can be seen in the north of Tehran. The maximum temperature can be seen in Southern Province due to the proximity of the desert which highest value is 18 ° C. Most precipitation is owned mountainous areas in the north of Tehran that Savanna and semi-arid areas of the morphogenetic action. Geomorphodinamic characteristic of these areas, are average effects of the prevailing winds and moderate to severe weak to severe Current water activity. Northern part of the study area is located in semi-arid regions. Geomorphodinamic characteristic of these areas, are the effects of wind and moderate to severe Current water activity. Southern part of the study area due to high temperature and low precipitations are located in arid regions and the most important Geomorphodinamic characteristic of these areas, are the effects of wind, Current water activity and weak mass movement. Conclusion The results showed that among seven weathering models in Peltier model, three models happened in the climatic conditions of Tehran and Alborz. So that the in most parts of mountainous regions there is weak weathering. In north of Tehran due to heavy precipitations and high temperature, Chemical weathering is more moderate type. While weathering in most parts of the study area is mostly very gentle.

Keywords: Weathering regime, Regions morphogenetic, Models Peltier, Tehran and Alborz Provinces
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Type of Study: Applicable | Subject: Special
Received: 2014/07/1 | Accepted: 2014/10/30 | Published: 2016/04/8
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Zoning of Stone Weathering Processes in Tehran and Alborz provinces based on GIS . 3. 2014; 2 (4) :59-77
URL: http://journals.hsu.ac.ir/agi/article-1-72-en.html


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Volume 2, Issue 4 (10-2014) Back to browse issues page
ژئوموروفولوژی کاربردی ایران Applied Geomorphology of Iran
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