فهرست مطالب

radar and optic remote sensing - Volume:2 Issue:2, 2019
  • Volume:2 Issue:2, 2019
  • تاریخ انتشار: 1398/06/10
  • تعداد عناوین: 5
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  • Mohammad Hossein Bagheri *, Saied Ebrahimi, Mohammad Mehdi Javadianzadeh Pages 7-18
    Calculation of the components of water balance is very important in water resources management. One of the key components of balance is estimation of the amount of water drained by wells, springs and Qanats. Calculation of this parameter is too costly and time-consuming because of the need for field visit and field measurement. In order to solve these problems and to calculate the discharge amount of water resources in short period of time, using remote sensing technology and satellite images can be useful. Accordingly, actual evapotranspiration, the most important component of water-balance equation has been calculated and evaluated using this technology. The scope of the study in this research is the Chahgir plain of Abarkouh where underground water drop has caused many problems in the area. For this purpose, six Landsat 8 satellite images (OLI and TIRS sensors) during the period of June to September (2016) in Julian days 174, 190, 206, 222, 238 and 254 as well as meteorological data of two synoptic stations were used and SEBAL method was applied to estimate actual evapotranspiration. The results of the study and its comparison with the data obtained from smart meters (installed on the wells) with a 7.2 percent error indicates high accuracy of remote sensing data and used methods. Also, the amount of net groundwater extraction is estimated 1.07 million cubic meter (MCM) that comparison by pumping volume data (3.98 MCM), shows low efficiency and high water loss in the case study.
    Keywords: Groundwater, Water Balance, Actual Evapotranspiration, SEBAL, LANDSAT 8
  • Mojtaba Khezri *, Masoud Salman Roughani Pages 19-32
    Land use planning is the most important issue of sustainable urban development and a major priority in urban planning. This study was conducted with the aim of investigating the extent of physical expansion of Yazd city, identifying the land use changes to urban use and determining the city growth directions during the years 2013 to 2018, using Landsat 8 satellite imagery over a time period of 5 years for Yazd city. Using the technique of detection of changes by comparative method after classification of images, changes in green space and moor lands were identified for urban use. Then, regional statistics techniques were used to determine the extent of city expansion and the nature of changes were obtained in different geographical directions. From 2013 to 2018, based on the results, 24.73% of the moor lands and 32.22% of the green area has had urban use. The growth of the city during this period were towards the East and South directions in the central and southern sectors in the marginal sector. The greatest amounts of green space changed to urban use were in the central and peripheral sectors, and the largest conversions of the moor land to urban use were in the central eastern region and in the southern marginal sector. The results showed that inappropriate distribution of applications in some parts of the city disrupted the spatial distribution of the land use.
    Keywords: Change detection, Satellite Images, Land Use Change, Yazd city
  • Sara Gilvari *, Alireza Mazloumi Bajestanib, Seyyed Abolfazl Kashfi, Alireza Sarsangi Ali Abadd Pages 33-47

    The need for a comprehensive management of sustainable environmental development is more than ever due to the growth of population and more waste production. In order to achieve the goals of sustainable development, environmental assessment before, during and after each project is needed. The purpose of the environmental impact assessment is to ensure that managers and experts meet the goals set in a project in accordance with government and environmental regulations. The first step towards achieving this goal will be exploring the study area. In this research, the Leopold matrix was used for environmental assessment of landfill location in Yazd. Environmental assessment was done on the problems resulting from landfill on the environment and living organisms of the area in the environmental assessment area by visiting the field of the current landfill site of Yazd. The total score of the results of the Leopold Environmental Assessment Matrix related to the current landfill site was -214. Therefore, it is possible to carry out management solutions to improve the status of the current landfill. By performing location studies using the hierarchical analysis method, zone one was designated as a suitable landfill site. The soil permeability gradient curve of the selected region was prepared and the soil type of this region was clayey silt. Which will be suitable for landfill.

    Keywords: environmental impact assessment, hierarchical analysis, landfill, Yazd city
  • Ghazal Lotfi, Mozhgan Ahmadi Nadoushan *, Mohammadhadi Abolhasani Pages 48-60
    Change detection of wetlands is one of the essential requirements for the management and assessment of wetlands. Monitoring water quality is a crucial issue for assessing the environmental consequences of human interventions in wetland ecosystems. The present study aims at studying the capability of satellite images in assessing the water turbidity and comparing their capability with that of ground sampling. Four stations in four directions were chosen in Gandoman wetland, located in Chaharmahal and Bakhtiari Province. Samples were taken three times in the wetland with the intervals of 30 days from September to December 2017. The turbidity index was calculated and the relationship between the data obtained from ground-based measurement and from satellite images was studied using linear regression analysis and correlation coefficient. The comparison between the amounts of turbidity observed in different stations in different months revealed that the turbidity value was at its highest point (214.49 NTU) in station number three in September, and its lowest point (2.25 NTU) in station number four in October and, therefore, there was a significant difference between the values (p<0.05). The results were also indicative of a significant correlation between the measured amounts of turbidity and the reflectance values of blue and red bands in the satellite images. Remote sensing techniques can overcome the limitations of traditional methods and be used as appropriate substitutes in monitoring the quality of water.
    Keywords: Pollution, Water resources, Monitoring, Landsat 8 OLI, Linear regression
  • Ali Asghar Torahi *, Hasan Hasani Moghaddam, Parisa Safarbeyranvand, Parviz Ziaeian Firoozabad, Ali Hoseeingholizade Pages 61-74
    The issue of mapping geological units during an evolving process has now reached a point where the detection and classification of geological units is carried out with the aid of hyperspectral sensing. In this study, using hyperspectral image of Hyperion sensor, related to Khorramabad area in Lorestan province, and using Spectral Angle Mapper (SAM) and SVM (Support Vectors Machine) algorithms for detecting and separating geological units After performing the necessary preprocesses, the MNF conversion and PPI algorithm were used to reduce data and extract pure pixels on the image, respectively. From overlapping of pure pixels with geological units and ground data, the average range for Each member was extracted and then these net members are used as inputs for the above mentioned algorithms and class B DVD image was done. Field surveys performed at the points provided by the Spectral Angle Mapter (SVM) confirm the superiority of the SVM method in separating geological units. Finally, by verifying the accuracy of the algorithms by calculating the error matrix, the accuracy of the classification of each method is respectively For SAM (68.83) and SVM (81.70), it was found that at the end of the SVM algorithm with a total accuracy of 81.70 was introduced as the best classification algorithm.
    Keywords: Hyperspectral Images, Geological Plot Map, Pure Members, SAM, SVM