Samad Abdi; Mohammd Hossein Ramesht
Volume 21, Issue 82 , September 2012, , Pages 64-70
Abstract
Since climatic changes, especially those of the fourth quaternary period have always changed landforms, identifying and detecting traces of these changes is an important topic for geomorphologists. Natural glacier remains from this period are one of the most important evidences of climatic changes and ...
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Since climatic changes, especially those of the fourth quaternary period have always changed landforms, identifying and detecting traces of these changes is an important topic for geomorphologists. Natural glacier remains from this period are one of the most important evidences of climatic changes and evolutions.
The present article detects and identifies glacial traces in Buanat basin. While identifying and introducing glacial traces of the fourth quaternary period using the usual geomorphic methods, it reconstructs environmental conditions in the coldest glacial phase and investigates the previous water-ice balance in the area. In this regard, annual average temperature in the area under study was 9.6 °C colder and precipitation in lower altitudes was 1.2 to 1.8 more than today which prepared appropriate conditions for glacier activity. Moreover, geomorphic evidences like glacial cirque, glacial valleys, and hanging valleys in the area prove the presence of glacial traces in the basin.
Findings of the present study proves the presence of glacial traces in the basin and provides the basis for future soil and water studies and land use planning.
Mohammad Hossein Ramesht; Roghayyeh Nikbakht
Volume 20, Issue 78 , August 2011, , Pages 89-93
Abstract
The city of Golpayegan and the surrounding area include metamorphic rocks and igneous masses produced by the performance of internal forces due to its location in the Sanandaj-Sirjan zone and also river sediments over the fourth era of geology. The existence of these igneous masses has led to the creation ...
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The city of Golpayegan and the surrounding area include metamorphic rocks and igneous masses produced by the performance of internal forces due to its location in the Sanandaj-Sirjan zone and also river sediments over the fourth era of geology. The existence of these igneous masses has led to the creation of diverse mineral resources in the city, such as the lead and zinc mines of Saleh-e-Peighambar, Godar-e-Sorkh china stone, Konjedjan marble, Haj Gharav plaster and ... . These mines are economically important for the people of this city and due to these conditions, Golpayegan and its area are strong in terms of mineral potential and therefore can play an effective role in regional development. In this research, we tried to investigate the role of geomorphology as one of the important branches of geography science. Geomorphology, on the one hand, studies units and forms such as highs and lows of areas such as mountains, plains…, and, on the other hand, the internal and external processes that form these tectonic units. These units, which have been transformed by various physical, chemical and biological factors from the first period of geology on until they have reached their current shape in modern times, are considered as one of the most valuable natural resources for humanity that are scattered in different geographic regions on the basis of geological and geomorphological characteristics. The method of examination and analysis in this paper relies on the geographic information system and the descriptive method. Using field observations and geological and topographic maps of the region we integrate the sediments of the region and existing mines based on ground surfaces (convex, concave, or flat) On the topographic maps, determine which types of mines and ores are located, how is the spatial distribution of mines based on the land levels, and assess the environmental capability of the region by preparing a map of mineral and ore mining processes.
Mohammad Hossein Ramesht; Leila Gorjii; Mojgan Entezari
Volume 18, Issue 70 , August 2009, , Pages 16-19
Abstract
For more than half a century, soil erosion prediction and modeling technology has been used as a valuable tool in protective design, engineering plans and research development. This technology includes mathematical equations that calculate estimates of the dependent variables of erosion (soil losses, ...
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For more than half a century, soil erosion prediction and modeling technology has been used as a valuable tool in protective design, engineering plans and research development. This technology includes mathematical equations that calculate estimates of the dependent variables of erosion (soil losses, production and sediment) as a function of independent variables (four main factors: climate, soil, topography, and type of use). The parameters in these equations include exponential powers and coefficients that determine or modify the values of the independent variables as part of mathematical calculations, some of which are empirical values prepared according to basic data, while others have physical definitions associated with erosion processes. Mathematical symbols and logical sequence are among other features of mathematical models. In general, erosion mathematical models include regression-derived models, characteristic models, and process models. In addition to empirical methods, several mathematical models are presented concerning erosion, in all of which mass conservation law or the continuity equation are used as the controlling equation. These models include the dynamic and static models, the weep model, GULTEM and EGEM model, each of which is related to a particular type of gully and is applicable in certain conditions. Undoubtedly, the models introduced in this paper can not be considered as comprehensive models without any probable defects. Therefore, it is suggested that according to the climatic, geological, geomorphological, and ... characteristics, a suitable model be determined for assessing the rate of gully erosion in each region.
