جستجوی مقالات مرتبط با کلیدواژه « chabahar bay » در نشریات گروه « مهندسی دریا »

Heavy metals are one of the most important environmental issues, due to their toxicity and resistance. In this study, the concentration of heavy metals (Alomunium, iron, mangenise, chromium, vanadium, nickele, zinc, arsenic, lead, cobalt, and cadmium) in surface sediments of Chabahar Bay was determined by using ICP OES to assess the risk of the metals for aquatic environment. The sampling stations were consisted of Posm, desalination plant, Konarak, Ramin, the entrance of Chabahar Bay and a reference station. The concentration of arsenic in the sediments of sampling area, especially at deeper parts of Ramin and coastal parts of Posm and Konarak, was 2.5 to 3 times ghier than threshold effect level (TEL), except for deeper parts of Posm. The results of this study showed that the concentrations of chromium (except for Ramin 2 and Tss 2), aresenic cadmium and nickel (except for Tiss 2) were 1-2.5, 1-5, 1-4 times higher than their threshold levels and international guidelines (NOAA و ISQGs), respectively. The results of this research showed that the dominant source of heavy metals in the sediments of sampling area was natural; except for cadmium and chromiumwhich originated from anthropogenic sources. However in some stations anthropogenic sources ffected on the concentration of some elements such as arsenic, lead and nickel.

This research, is based on the analysis of field data as well as existing models of hypothetical tsunamis caused by the Makran fault under different scenarios, introduced forces on coastal residential structures, taking into account the depth of penetration and altitude of the tsunami flood in the Chabahar area. Also, considering the land cover of the area, the stability of the residential structure of the sample was examined with the frame of a floor using the SAP2000 software. Since a structure is exerted against linear forces from the forces flowing from a tsunami, a nonlinear static analysis was used. In this study, existing residential buildings in the region were examined in such a way that the possible advance of the expected tsunami was anticipated to propose the most secure structures. Also, the probable flooding of Chabahar, the largest population center and coastal facility in the north of the Oman Sea, was assessed which was based on the simulation and numerical modeling of pre-assumed tsunami in the area. The results indicated that, in the case of a single-story structure, according to the thesample, up to a displacement of 0.6 cm for a base cut, about 55 tons behaves almost linearly. The structure moves into the destruction area after moving 1.55 cm. In a building with a two-story frame, the absence of walls resistant to hydrodynamic forces and the wave fracture force will be much less because the width of the column in front of the flow is much smaller than the width of the wall, which is equal to the total width of the frame. That is why the amount of these forces is greatly reduced.