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The Alborz mountain chain is a region of active deformation within the Arabia–Eurasia continental collision zone. The southern part of central Alborz Mountains, in the north of Iran, represents complex tectonics because it is located at the border of two developing continental sedimentary basins between southern central Alborz and Central Iran. An arid and semi-arid climate, a large extent of Quaternary sediments, rugged topography, salt domes and faults with historical seismicity influence the Habble-Rud River catchment. In the present research, a number of tectonic geomorphologic indices were extracted from satellite imagery and 10?m DEM (digital elevation model) data in order to identify relative tectonic activity within the basin. The
The aim of this research is watershed prioritization using morphometric parameters and Multiple Criteria-Decision-Making (MCDM) by Geographic Information System (GIS) and Remote Sensing (RS) techniques. For this purpose, First digital elevation model (DEM) was developed of study area using low frequency radar data, then, 17 watershed extraction for prioritization in ArcGIS10. 2. After preprocessing and preparation of digital elevation model 14 morphometric parameters extracted including 5 Shape morphometric Parameters (Form factor, Elongation Ratio, Circularity Ratio, Compression ratio), 2 linear parameters (bifurcation ratio, Stream length), 5 areal parameters (Drainage Density, Drainage texture rate, Constant of channel maintenance, Strea
Introduction: More than half the world‟ s population lives in coastal regions (Bird, 2008). The shorelines are unstable zone that comprises marine and terrestrial domains very sensitive to a variety of geological process; Waves and tides play a most important role in the coastal dynamics, and their mutual interaction accounts for redistribution of the sediment budget causing accumulation or erosion (Dabrio, 2000). The coastal ocean, where land, air and sea meet, is a region of very high physical energy and biological diversity that is heavily exploited by man (Murthy et al., 2002). Tidal flats are low-lying areas where alternately covered by water and exposed to the air each day (Gore, 2010). Analysis of forms and coastal conditions provi
Mud volcano is a natural and attractive phenomenon which is generally found as a dome-like feature and basin-shaped in some cases. Mud volcanoes comprise mixtures of water, mud and gas. They are found in most parts of the world particularly in the Alps and Himalaya belts. In Iran, most of the mud volcanoes appear in the coastal plains of the Caspian and Oman seas. Mud volcanoes are commonly considered as indicating presence of oil and gas reserves, and are used to predict subsurface hydrocarbon fields. One or two mud volcanoes were formerly found between Minab and Jask in the Hormozgan Province. Remote sensing study followed by a field work of 30 days in this research led, for the first time, to the identification of 15 mud volcanoes in the
The instability and mobility of sand dunes is a major concern for those involved in the planning processes and management of arid coastal plains. Dune systems are created due to several factors and elements. Regarding environmental planning and the management of coastal zones, the study of their formation and development processes is of great importance. The present study aims at identifying the most influential factors in the dispersion of sand masses in the western region of the Makran Plain. The data for this study consisted of spatial maps of landform distributions, wind velocities and directions, fetch lengths as well as dynamic waves. Thematic topographical and geological maps, satellite images, GPS, and software such as WRPLOT View,
Geo-morphotourism is a new sub-discipline that relay on nature and try to maintain locality nature identity and introduce geologic phenomenon of a place to tourists. Geo-tourism has a wide audience nowadays all over the world. Geo-tourism is a kind of tourisms which try to maintain geographic, environmental, cultural characteristics of visited places or enhanced them; it may have economic development for visited places' citizens, too. It includes visiting places which have special landforms and geologic characters for spending leisure times and amazing feeling, improving their understandings of nature and educational & training purposes...
Zonings of seismicity of Fars province in Iran and comparison its' finding to other researches results is aim of this paper. We used Statistical method for analyzing recorded earthquakes in study area during 110 years (1900-2010), using GIS methods for this zoning. By using USGS seismic data of the region and fault maps, Excel software and ArcGIS, we prepare a seismic risk map of study area. Findings show that during study period we have 1636 earthquakes by 2.5 t0 6.9 magnitude. In the study area about 70 percent of earthquakes were lower than 4.5 magnitudes; maximum of earthquake was for Lar and Arsanjan counties. Earthquake zoning shows that 60 percent of the Fars Province area in inside High level seismicity zone. Comparison between thes
3-DiscussionThe factors affected on creation of Garmsar alluvial fan can be divided into two parts of essentials and basic. The morphology and sediment are essential factors and the climate and hydrology are basic parameters. In Hablerod basin, slope (by the addition of runoff rate, faster delivery of erosion materials to downstream) is one of the important factors that create and transport alluvial materials and sediment, in the creation and extention of Garmsar alluvial fan. Hablerod basin is considered large watersheds, so this area is one of the factors in the creation of Garmsar alluvial fan. Garmsar fault with movement and precession of path Hablerod role plays role in locating on this fan. 22.84% of the Hablerod basin rocks are with
Neotectonics activities have brought about instability in several landforms, especially fluvial ones in Iran. Garmsar alluvial fan is one of the areas located in a seismic hazard area. This research attempts to determine and analyse the seismic hazards zones in Garmsar alluvial fan using the seismic data, geologic and topography maps, and buffering method. The equations proposed by Zare, Selmmons, Mohajer-Ashjai, Melville, and Smith were used to determine the fault's seismic potential around the Garmasar alluvial fan. Berberians method was used for the spatial analysis of fault buffering. The results indicated that Garmsar & Sorkhkalot and Koh Lalehzare & Paien Ghaleh faults have the highest and lowest seismicity potential in the study area
Vulnerability is a logical effect outcome from risk of living over the hazardous regions as well as the resiliency capacity of people for recovers the damages of hazard events. Vulnerability is a complex phenomenon which can effect and observe in from of environmental, political and c-social—economical vulnerability. According to land subsidence hazard affected over the residential area of south and risk of settlements and infrastructures due to this morphological hazard, the vulnerability appeared as important and necessary task to study area in form of extortion and spatial analysis. Unfortunately, the wide angle of vulnerability in from of environmental and socio-economical have been effect to the area. It is mainly due to hidden form
Understanding of landforms and their distribution are basic needs of applied geomorphology and other Earth sciences to understand and evaluate of landforms development, slope stability studies and regional planning. Landforms have at least two features: the first they are result of last geomorphologic and geologic processes and second to determine the borders now geomorphologic processes.
Liquefaction appears in saturation conditions in sandy to silty unconsolidated soils. When seismic loads of earthquakes stresses on suitable masses of soils for liquefaction, these soils tend to reduce their volumes, this leads to liquids trap inside the soil and water in pores pressure increases, so effective shear stress decreases inside the soil and liquefaction appears. This phenomenon during an earthquake can lead to geomorphic changes on the surface of the earth and causes damages on human foundations. Recognizing and zonation of suitable areas for liquefaction alongside by determining risk potential areas can help us to reduce damages during an earthquake. In this research, by using IRS remotely sensed data and overlying digitized la
In this research, geomorphologic landforms of Darab region were identified and their geomorphotourism capability was evaluated. Satellite images, geological and topographic maps and field data were used for identification of geomorphological landforms and then the geomorphotourism capability of mentioned landforms were determined based on Praloong method. The results of this study reveal that there are six geomorphologic landforms in the study area. The mentioned landforms were ranked based on scores in Pralong method. Based on Praloong method, Darabgerd salt dome landform, due to archaeological worth, natural history and the existence of beautiful natural landscape around it, got the highest score, and therefore was identified as the most
Stalinization is a kind of geomorphologic hazard which appeared in many regions of the world. Reduction of water and soil quality is one of the main problems of this phenomenon during recent decades which has severed results. Salt Domes are one of important sources of salinity and are a treat for water and soil resources. In Iran rare studies have been done over this problem which mainly emphasis on quality of water and based on field researches...
Erosion means the harvesting, transportation and movement of eroded material. The concept is very extensive erosion that has different definitions in different disciplines. The purposes of this paper is finding a brief definition of" erosion" concept in different perspectives and comparing it in Geomorphologic and Natural Resources point of views. To achieve this goal, we try to use the library documents, analyze and compare the findings of this work with each other. Results show that most differences between these approaches, different time, place, is corrosive agents and erosion processes. In Geomorphologists view of point, erosion is a natural phenomenon and Sformation of it is slow and makes landscapes and landforms that are environment
Building and infrastructure construction at ground surface or under the ground are required to consider the existence of faults to prevent the damages due to earthquake evidence. Furthermore, faults identification and recognition their shake and vibratory behavior will be an importance task to understanding and prediction the vulnerability in area. The main aims and goal of this study is to examine the risk of fault due to the earthquake in the Silakhor plan by the examination of effective parameters (fault length, magnitude, rupture radiance and vertical replacement). The tectonic condition as well as earthquake potential of area was examined at the first stage. To determine this condition, the historical earthquakes of the area were extra
Extensive land use and land cover changes in many urban areas of Iran, particularly Tehran as the capital, have resulted in many problems such as destruction of natural resources, environmental pollution, and uncontrolled urban growth over the past three decades. Rapid population growth and high migration rates to Tehran can be regarded as the main driving forces for suburb development and very fast land use/cover changes in this city. Mapping and analyzing the land use/cover changes are the first and important steps for management of land use changes. Possibilities of land use/cover change prediction, provided by the Markov chain, is a useful tool for effective control of land use changes. Because of these capabilities, this paper tries to
Detection, monitoring and precise assessment of the snow covered regions is an important issue. Snow cover area and consequently the amount of runoff generated from snowmelt have a significant effect on water supply management. To precisely detect and monitor the snow covered area we need satellite images with suitable spatial and temporal resolutions where we usually lose one for the other. In this study, products of two sensors MODIS and ASTER both on board of TERRA platform having low and high spatial resolution respectively were used. The objective of the study was to modify the snow products of MODIS by using simultaneous images of ASTER. For this, MODIS snow index image with high temporal resolution were compared with t
Reduction of irreparable damages of natural disasters in Iran needs their correct understand of causes and solutions. In this regard, nowadays, vulnerability is offered as the main determinant of disaster that comprises three approaches: Biophysical, Social construction, and synthetic. Different implications of these approaches on perception, analysis and reduction of vulnerability needs full investigation of them. Adopting descriptive-analytical method and comparative study, so, this articles traces answer to this question: which approaches offer full explaining of the perception and analysis of community vulnerability to natural hazards. The study shows that for understand and analysis of Vulnerability at community level, there is no adva
Climate change has direct and indirect effects on the growth of agricultural products. Wheat is one of the strategic products of the world that is affected by climate change. This research was done in the Khorasan Razavi province in order to study the variability of wheat yield by the change of climatic parmeters including precipitation and temperature. To do this, 11 stations were selected. The climatic parameters included the total monthly precipitation and five parameters of temperature, including; mean annual temperature, mean annuall maximum temperature, mean annual minimum temperature and monthly max-min. Then the wheat yield in each station was gathered for wheat growth period (phonology) from October to June for 20 years (1984-2003)