علوم زیستی دریا
Masoome Ebadi; Olyagholi Khalilipour; Ali Dadollahi sohrab; hossein mohammad asgari; Syyed hossein Khazaei
Abstract
Construction project of ports, jetties and other marine structures have more negative environmental effects than other projects. In this study, we investigated Environmental Impact assessment for the construction and exploitation of Yard-Valiasr Jetty in Khorramshahr Port using corrected Leopold and ...
Read More
Construction project of ports, jetties and other marine structures have more negative environmental effects than other projects. In this study, we investigated Environmental Impact assessment for the construction and exploitation of Yard-Valiasr Jetty in Khorramshahr Port using corrected Leopold and RIAM Matrices. Corrected Leopold Matrix results showed that none of the calculated effects and consequences are not at the threshold of the -3.1 degree. The RIAM Result also revealed that negative effects change more between neglected negative effects to moderate negative effects, but for exploitation phases, Water Ecosystem tolerates noticeable negative effects that confirmed corrected Leopold Matrix results. So base on two Matrices result and based on developmental impact of project on industry and transportation and also its compatibility with land use of area, the project could be run by incorporating mitigation plans and monitoring measures.
علوم زیستی دریا
Saeid Farhadi; Hossein Mohammad Asgari; Ali Dadolahi Sohrab; Seyed Mohammad Jafar Nazemosadat; Sayyed Hossein Khazaei
Abstract
Dust prediction such as prediction of wind and rain needs to synoptic information to the earth's surface, upper layers of the atmosphere, the prediction maps of land surface and upper levels as well as using radar and satellites. The purpose of this study, use of remote sensing technology and MODIS images ...
Read More
Dust prediction such as prediction of wind and rain needs to synoptic information to the earth's surface, upper layers of the atmosphere, the prediction maps of land surface and upper levels as well as using radar and satellites. The purpose of this study, use of remote sensing technology and MODIS images to estimate dust optical depth on the Persian Gulf surface and estimating the linear correlation relationship between the dust measurements in ground and atmospheric. The dust optical depth calculated using the code developed in MATLAB software. Evaluation of extracted data conducted using Pearson correlation coefficient, RMSE and RMSD index. In this study, optical depth obtained from image processing compared with the optical depths obtained from AERONET network. The evaluation results showed a high and significant correlation between the obtained optical depth and optical depths obtained from AERONET network (R2=0.99). The best and most suitable mode demonstrated for 1.243 and 1.643 bonds. At all stations, AOD value obtained from satellite image is bigger than AOD amount corresponding to the AERONET station and the algorithm used has overestimated. The cause of this more estimate can be use of limited particle's effective radius, because the scope of this effective radius is limited at the distribution of particle size in log-normal. Error resources at the retrieving particulate matter was defined such as sensor calibration error, pollution on the radiation angle, or poor predictor of water reflection.
علوم زیستی دریا
maryam razmi; hosein Mohammad Asgari; ali Dadolahi-Sohrab; seyyed mohammad jafar Nazemossadat; seyyed hosein kh
Abstract
Coastal environments are considered the most sensitive system environments. In terms of environmental Coastal areas because of the sensitive and productive ecosystems have high importance and value. Having knowledge of the coastline’s behavior can help of the coastal better management. The aim ...
Read More
Coastal environments are considered the most sensitive system environments. In terms of environmental Coastal areas because of the sensitive and productive ecosystems have high importance and value. Having knowledge of the coastline’s behavior can help of the coastal better management. The aim of this study is to assessing the application of the OIF utility index factor in the assessment of coastline changes in Dayyer city, Using Landsat satellite images sensor TM and OLI 1991 and 2014 and the software are 2013®MATLAB and ArcGis 9.3. For the separation of land and water, OIF index value for all different band combinations in the application MATLAB® 2013 was calculated and then high-pass Sobel filter with 3 × 3 masks was applied to the images. Then digitization process during different periods in application environments ArcGis 9.3 was done manually and with high precision. The results of the survey the coastline from 1991 to 2014 show moving the coastline to the sea side (sedimentation) and landward (erosion), Which totals 33/784 square kilometers sedimentation and 9/132 square kilometers erosion shows from 1991 to 2014, in Dayyer city occurred because of the construction of piers, installations manmade and natural factors.
علوم زیستی دریا
a b; h m; a d; h e; s kh
Abstract
Atmospheric dust particles originating in the arid and semi arid regions of the world are known to be principal sources of mineral dust. The use of satellite remote sensing dust, the potential of this technique is created to provide valuable information to assist in the design of network measurement ...
Read More
Atmospheric dust particles originating in the arid and semi arid regions of the world are known to be principal sources of mineral dust. The use of satellite remote sensing dust, the potential of this technique is created to provide valuable information to assist in the design of network measurement and estimation dust in marine environments. Dust deposited provides key nutrients such as iron to oceanic phytoplankton. Aerosol optical depth were reviewed in the study between March 2008 and December 2013 in the Persian Gulf. Aqua and Terra satellites for the MODIS sensor data as well as aerosol data (PM10) and Environmental stations and optical depth stations AERONET, used to evaluate the aerosol optical depth. The results showed that the data of MODIS AOD has acceptable accuracy and very high correlation between the values measured by MODIS and network AERONET, there (correlation coefficient: 90/0). Comparison between AOD values derived from measurements by satellites Aqua and Terra MODIS sensor and the amount of aerosol (PM10) estimated environmental stations in the Persian Gulf region also took place. The results showed that between these two values correlated to the Aqua and Terra satellites in the study area, and the correlation coefficient was greater in summer than winter. The results of this study showed that the optical depth data from the MODIS satellite images can provide accurate information dusts the Persian Gulf.