A. R. Salehipour Milani; K. Nezhadafzali; F. Bayatani
Abstract
The Gunu storm, due to its severe intensity, caused substantial damages to the coasts of Sistan and Baluchestan and Hormozgan provinces. Tropical storms develop in the form of enormous hurricanes which suck the surrounding air towards them. We feel such rapid movement of air as strong winds; In satellite ...
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The Gunu storm, due to its severe intensity, caused substantial damages to the coasts of Sistan and Baluchestan and Hormozgan provinces. Tropical storms develop in the form of enormous hurricanes which suck the surrounding air towards them. We feel such rapid movement of air as strong winds; In satellite images, it is seen as the movement of clouds (water vapor) towards the core or the eye of the storm. With a velocity of 150 km/h and rain reaching 160 mm, the storm had made considerable gemorphologic changes in the coast of Oman Gulf as well as damages. Such geomorphologic changes were studied using ETM, TM and LISS III satellite data and were compared before and after the Guno storm. Also the early results taken from satellite images were coordinated with field study after the storm. These inquiries show that acute changes have been made in the opening of important estuaries such as Shur, Sargan, Kahir, Bir and Bandini. Also change stream course, due to migration channel on river meander and area of flooded area on coastal plain was determined. Cooperation of satellite data shows, discharge of sediment to the bays such as Pozm, Chabahar that it can be a serious problem for navigation and coastal structures in this area.
K. N. Afzali; R. lak
Abstract
United Arab Emirate has recently started to build some artificial islands in the southern part of the Persian Gulf. Constructing of these Islands, such as each marine structure, have special effects on the morphology of the sedimentary Basin. This investigation focused on the documentation of morphological ...
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United Arab Emirate has recently started to build some artificial islands in the southern part of the Persian Gulf. Constructing of these Islands, such as each marine structure, have special effects on the morphology of the sedimentary Basin. This investigation focused on the documentation of morphological and environmental effects of making artificial islands by the UAE in the Persian Gulf. This research is based on remote sensing studies and sedimentology investigation. Remote sensing studies carried out with comparing satellite data related to 1998, 2003, 2007 and 2008. Sedimentology investigation of the three sediment samples taken from the coastal part of the artificial islands was carried out. The deliberations indicate that construction of these islands have negative effects on geomorphological features in coastal part of the Persian Gulf in UAE region. The Sedimentation around the islands leads to the reduction of water depth. The kind of the sediment is usually carbonates and their origin in the western part of the islands is affected by marine longshore currents. However, there are two sources proposed for the sediments in the eastern part of islands; intrabasinal (direct precipitation) and detrical. The construction of linear barriers along the coast leads to the building of restricted lagoons between the coast and barriers. It is estimated the rate of progradation of the coast (sea ward migration of the shoreline) is 120 m from 2008 to 2009.
K. Nezhadafzali; R. Lak; M. Sarvati; F. Bayatani
Abstract
Mud volcanoes are natural and site-seeing phenomena in the world, particularly in the Alps and Himalayas belts. Mud volcanoes usually appear in form of a dome or a pool. The mud volcanoes comprise water, gas and mud. with plenty of applications, like tourism, mud therapy, supplying of essential ...
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Mud volcanoes are natural and site-seeing phenomena in the world, particularly in the Alps and Himalayas belts. Mud volcanoes usually appear in form of a dome or a pool. The mud volcanoes comprise water, gas and mud. with plenty of applications, like tourism, mud therapy, supplying of essential body trace elements, and their usage as mud for pottery. In Iran most of the mud volcanoes appear in coastal plains of the Caspian and Oman Seas. A mud flow was formerly found between Minab and Jask in Hormozgan Province. These types of exclusive, beautiful and natural phenomena require more attention by tourism industry. On the other hand, mud flow must be introduced as the most important geotourism phenomenon of northern coast of the Oman Sea. In this research, after data collection, including topography and geology maps, AIRS satellite data and aerial photos, remote sensing verifications were implemented. Then, mud flow determination was completed by field work studies and checking. A sediment sample was taken from each mud flow in the field work, then analyses of major, accessory and trace elements were carried out by using ICP-OES. About 30 small and big mud volcanoes around of Gavak mountain and 6 mud volcanoes at Gatan and Tojak area were determined in Hormozgan province that they have not been introduced before. The biggest mud volcanoe (Aryana) has cone with 73m hight at Gatan area and the smallest one has cone with less than 1m at Gavak area. Meantime, hydrogeochemical studies or determination of the percentage of available elements for all mud volcanoes were implemented. Since this geomorphological phenomenon indicates tectonic activity of a region, hence there is a possibility of mild earthquake and faulting occurrence. This issue must be considered in construction of buildings and certain fixed structures, such as bridges. Emitted gases through mud volcanoes relatively indicate the internal conditions of the Earth, particularly existence of oil and gas reservoirs. Mud flow is an index for availability of oil and gas reservoirs. They are used for prediction of availability of these reservoirs inside the Earth.
K. Nejad. Afzali; F. Bayatani; E. Moghimi
Abstract
Coastal region are influenced by land and sea. Geomorphologic coast features are related to sea level change, regional river regime, erosion processes, sedimentation, climate change, geological outcrops and weathering and tectonics. Tom bolo, lagoon and barrier are geomorphologic coast features that ...
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Coastal region are influenced by land and sea. Geomorphologic coast features are related to sea level change, regional river regime, erosion processes, sedimentation, climate change, geological outcrops and weathering and tectonics. Tom bolo, lagoon and barrier are geomorphologic coast features that can be seen in Bir coast of Iran. Therefore, recognizing the producing mechanism and their changes, leads supervisors to have better management, and do their best for civil and improving planning in coast area. In this research in addition to field studies and sampling, aerial photos 1/40000(1993), topographic maps 1/20000, high resolution images (ETM and IRS) 1998, 2005, 2008 were used. It is concluded that the area is tectonically active, sedimentation; erosion processes, river regime and sea level change are caused to the Tom bolo, Lagoon and Barrier in Bir coast. Surveying the forms, sediment shows an obvious computation between marine currents as constructive process of Tom bolo, lagoon and barrier, and rivers as destructive process in Bir coast.
