List of Articles mangroves

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  1 - Potential Expected Climate Change Impact on Persian Gulf Coastal Mangrove Ecosystems Based on Temperature and Precipitation Variables
  Hana Etemadi Hossein Delshab
  10.22034/jest.2019.30667.3907
  Background and Objective: Climate change and global warming are one of the most widespread and important environmental hazards. The purpose of this study is to investigate the trend of minimum, maximum and rainfall temperatures in the past period of Bushehr as a coastal More

  Background and Objective: Climate change and global warming are one of the most widespread and important environmental hazards. The purpose of this study is to investigate the trend of minimum, maximum and rainfall temperatures in the past period of Bushehr as a coastal province of the Persian Gulf and predict its climatic future by the end of 2100 AD, as well as the possible effects on the mangrove forest ecosystems of the Persian Gulf. Method: In this research, the statistical down scaling model (SDSM) along with two different GCMs entitle CanESM2 in three RCP2.6, RCP4.5 RCP8.5 scenarios and HadCM3 in A2 scenario, were used to simulate climatic variables during base (1961-2005), current and future (2010–2099) periods in Bushehr synoptic station. Furthermore, model evaluation and uncertainty assessment performed by five different statistical criteria and a non-parametric bootstrapping technique, respectively. Findings: The linear regression of the observed winter and summer mean temperature showed that mean temperature has increased +1.8 and +1.7°C over the past 47 years, respectively. Both, CanESM2 and HadCM3 model simulation results demonstrated that the most raise of minimum and maximum temperatures will occur in the future cold seasons. But, CanESM2 simulation analysis revealed that a decrease trend will occur in the minimum and maximum temperatures through future warm months. Also, HadCM3 simulation results showed that precipitation will rise in summer and fall seasons, while CanESM2 results presented an increase in rainfall variable throughout the year. Discussion and Conclusion: Both of models have predicted warmer winter in the next several decades. Based on CanESM2 model results that we will have longer warmer seasons, there is a possibility of prolonging reproduction (germination and flowering) season in Persian Gulf mangroves from 3 to 6 months. Based on our results, future rainfall is more likely to become more frequent and intense. If those precipitations do not occur in extreme events, accompany with high temperature can cause more mangrove expansion and growth in future decades. Manuscript profile
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  2 - Effects of Rolling Tire of Vehicles on Skid Resistance and Noise Pollution on Asphalt Pavement
  Amir Esmael Forouhid Ali Mansour Khaki
  10.22034/jest.2018.13824.2241
  Background and Objective:  Noise pollution caused by vehicle traffic is one the important problems in the urban areas.  As the cost of construction and installation of acoustic walls to prevent the noise pollution is high, dealing with this problem needs to fo More

  Background and Objective:  Noise pollution caused by vehicle traffic is one the important problems in the urban areas.  As the cost of construction and installation of acoustic walls to prevent the noise pollution is high, dealing with this problem needs to follow the techniques that will increase the cost of the implementation on roads. Improving the pavement texture of the superstructure is one of the methods which is very effective in order to reduce the noise of tire and road surfaces and reduce sound reflection from the surface of the asphalt. Method: For the evaluation of asphalt resistance test is in accordance with ASTM English standard pendulum E303-74 in wet conditions on the different parts of the asphalt. Findings: The number of friction road surfaces with a coefficient of negative noise level compared with the amount of 0.1469, i.e. by increasing the number of friction road surfaces will reduce the amount of created noise level. As well as the depth of the texture of the road surfaces that form the superstructure materials fitted size is designated with a direct proportion with the amount of pollution 0.2810 which is coefficient for the sound created and any size from fine-grained materials will increase the amount of sound level. Discussion and Conclusion: According to the results of the estimated coefficients from the equation, it can be found that in the hands of the preparation of road surfaces with high friction number can release the noise pollution level including the noise of moving vehicles, especially in urban areas and sensitive areas. It is therefore advisable the sensitive areas to be in the process of preparation of the superstructure and maintain the order adopting the proper resistance of road surfaces and the coarser materials.   Manuscript profile
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  3 - Evaluation Changes and Quantification Mangrove Forests in Khorkhouran Protected Area with Emphasis on Hydrodynamic Strait of Hormuz
  MohammadAli Zangane Asadi ebrahim taghavi moghadam Elahe Akbari
  10.22034/jest.2019.22974.3203
  Background and Objective:  Mangrove forests of Iran is the only landscape of forest in the hot and dry southern coast of Iran that is ecological and Ecotourism value and is dependent on to their southern coastal livelihoods. Therefore it is essential to awareness o More

  Background and Objective:  Mangrove forests of Iran is the only landscape of forest in the hot and dry southern coast of Iran that is ecological and Ecotourism value and is dependent on to their southern coastal livelihoods. Therefore it is essential to awareness of changes mangrove forest as a national property. Environmental changes occur in the vast and long term and remote sensing technology could be very suitable and accurate tool for monitoring changes. Method: The purpose of this study is to evaluate changes in forest cover Khorkhoran protected mangrove area according to Hydrodynamic Processes Strait of Hormuz. For this purpose, we used Landsat satellite images of 1989-2015 and a variety of remote sensing techniques, including the difference of images, the difference of vegetation, the main component of difference tasseled cap and compare the classification. To evaluate the accuracy of changing detection techniques, taken from the ground realities through Field observations and satellite images of Google Earth, the total accuracy and Kappa coefficient were used. Findings:The results show that the detection of post-processing methods, methods of principal components analysis (PCA1) and difference vegetation is suitable methods for detecting changes. After applying the method comparative of classification, that is a pre-processing method, maximum likelihood algorithm with 0/9781overall accuracy and kappa coefficient 32/98% was introduced as the best method of classification of satellite images. Was also in 1989 year the mangrove forests (dense and scattered) 125.8 square kilometers that added to the 48.9 square kilometers in the last 26 years. Discussion and Conclusion: Increased mangrove forests Because of Factors Such as increasing temperature and sea levels, increased sediments in the delta region and the low slope of the coastal area.  Therefore, any facility and infrastructure projects should pay attention to environmental considerations and ecological.   Manuscript profile