Yazar "Savran, Dogan" seçeneğine göre listele

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    ASSESSMENT OF GROUNDWATER QUALITY OF EAST THRACE, TURKEY FOR IRRIGATION PURPOSES WITH THE AID OF GEOGRAPHICAL INFORMATION SYSTEMS
    (Stef92 Technology Ltd, 2016) Arkoc, Orhan; Savran, Dogan
    Quality of irrigation waters has always been a major concern for crop yield. The study area (Thrace) is one of the main wheat and sunflower production lands of Turkey. In this study quality of groundwaters used for irrigation purposes in east Thrace was assessed. For this objective, groundwater samples (n=18) were collected from deep irrigation wells and later were analyzed for chemical properties.The samples were analyzed for pH, total dissolved solids (TDS), and concentrations of HCO3-, NO3-, Na+, K+, Ca2+, Mg2+ and Cl and spatial distribution maps of these ions and cations were prepared by Geographic Information System (GIS). Subsequently sodium ratio (Na%), sodium absorption ratio (SAR), residual sodium carbonate (RSC) and magnesium hazard (MH) indices of these waters were calculated and spatial distribution maps were prepared by GIS. Distribution maps of these indices showed that majority of the groundwaters in the study area were suitable for irrigation.
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    EXPLORATION AND MAPPING OF ANCIENT UNDERGROUND TUNNELS WITH A HETEROGENEOUS ROBOT TEAM
    (Stef92 Technology Ltd, 2016) Savran, Dogan; Tuna, Gurkan
    Although archaeologists have a great desire to uncover ancient underground tunnels, it is a really hard work since most of the ancient tunnels are very small, measuring only around 60 in width, typically just enough for a person to crawl through. In addition, although most ancient underground tunnels include small rooms and storage chambers in some places, since the tunnels are generally very long, exploring and mapping those tunnels is not practical at all by using such an approach. In this paper, we present a novel approach to explore and map ancient underground tunnels. The approach we present is based on a combination of autonomous mobile robots, namely a water-proof autonomous mobile robot and an unmanned aerial vehicle. In our approach, while the mobile robot is responsible for exploring and mapping of underground tunnels, the unmanned aerial vehicle is used to map and localize the tunnels on a global map. With a set of calculations realized with handheld highly-accurate GPS devices, possible mapping errors are minimized. A case study is presented to explain the proposed approach.
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    Three dimensional digital terrain model approach for the projection of urban silhoutte - The case of Edirne
    (Elsevier Science Bv, 2016) Sazak, Saduman; Savran, Dogan
    The world's leading cities are remembered with the structures identified with that city, symbolizing the city alone, creating adequate images concerning the city. Within the scope of the study, the urban silhouette model is created by using three dimensional digital terrain model for the protection of Selimiye Mosque's rapidly disappearing silhouette which is one of the essential elements of the urban identity of Edirne chosen as an example and is on the Unesco World Heritage list. This model, at the same time, contributes to creating the legal basis for restricting the rights of construction intended for the protection of urban silhouette. (C) 2016 The Authors. Published by Elsevier Ltd.
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    USE OF TOTAL STATIONS TO MODEL HISTORIC BUILDINGS AND STRUCTURES
    (Stef92 Technology Ltd, 2016) Savran, Dogan; Yavuz, Hasan Bora; Tuna, Gurkan
    Since architectural heritage is an exceptional source of potential and inspiration for a city's development and tourism has an important role in economic growth and poverty reduction, the preservation and maintenance of original architectural fabric and exceptional urban structures is very important. Due to these reasons, in recent years, there has been an increasing demand for modelling of historic buildings. With this aim, in this paper, a novel approach is proposed and the details of a study and field work carried out to model a historic bridge in Edirne, Turkey are given. Reflectorless total stations were preferred in the study since they allow performing accurate and efficient measurements with minimal fuss. In addition, they allow being controlled from a distance via remote control and this way the operator can control a set of total stations at the same time. The results of the field work reveal that total stations eliminate risk of damage during surveying and sub centimetre accuracy can be achieved.