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    A potential landslide area investigated by 2.5D electrical resistivity tomography: case study from Canakkale, Turkey
    (Springer Heidelberg, 2016) Coskun, Nart; Cakir, Ozcan; Erduran, Murat; Kutlu, Yusuf Arif; Cetiner, Ziya Sedat
    Geophysical methods provide important tools to investigate the shallow earth. One of these methods is electrical resistivity tomography (ERT), which has the capability to provide spatial and volumetric information on both subsurface structures and property variations. Specifically, the ERT is an important tool to define the geometry and characteristics of landslides. In this study, we share our results for an electrical resistivity tomography survey that we conducted on a field where the city of Canakkale, Turkey has a plan to build a War Museum approximately 56 acres wide. The construction field under consideration presents potential landslide risks prominent with high slopes on especially the northeastern side of the area. Because of possible intense load on the ground anticipated from deployment of heavy artillery and also from construction sites, landslide risks in the field are significantly increased. Quaternary-aged alluvial formations consisting of unconsolidated clastic sediments cover the region. In order to investigate the area, we carried out 2.5-dimensional resistivity survey using a multi-channel, multi-electrode system along 16 profiles with a total length of 2016 m. Borehole information from ten close wells was used to aid the interpretation of resistivity sections. The results showed that the shallow electrical structure beneath the study area is multi-layered of which the second layer from the top has the lowest resistivity and then the resistivity values steadily increase with depth. The low resistivity in the second layer is likely caused by extra water injection into the system from relatively high topographic structures to the southeast and also from nearby water channel that partly perimeters the study area. The bottom of low resistivity layer exhibits potential landslide surface overriding the deeper slate bedrock with relatively high resistivity. The excess load after the planned construction may trigger catastrophic slip along this slip interface. Based on our observations, we proposed some protective measures to avoid the landslides in the considered area.
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    Öğe
    AYVACIK-TUZLA BÖLGESİNDEKİ JEOTERMAL KAYNAKLARDAN METAL/MİNERAL KAZANIM OLANAKLARI
    (2018) Cetiner, Ziya Sedat
    Bu çalışmanın amacı Biga Yarımadası'nda ticari olarak önem atfedebilecek metal ve mineral içeren jeotermalsahaların jeolojik ve jeokimyasal sınırlarını tanımlayıp, sürdürülebilir bir geri kazanım teknolojisini özgün birfizibilite analizi ile bütünleştirerek değerlendirmektir. Biga Yarımadası özelindeki jeotermal kaynakların fizikselözellikleri ve kimyasal kompozisyonları incelendiğinde, yüksek sıcaklığa (T>60°C) ve nispeten asidik pHdeğerlerine sahip kaynakların yeterli miktarda ticari değere sahip materyali sağlayabileceği öngörülmektedir.Gerçekleştirilen pilot ölçekli fizibilite analizine göre Tuzla jeotermal sahası temel alındığında jeotermalakışkandan günde yaklaşık 22 Kg Li metali üretebileceği hesaplanmıştır. 10 yıllık bir işletme süresi göz önünealındığında fayda-maliyet oranı (F/M) 3,71 olarak belirlenmiştir. Birden büyük olan bu oran yapılacak gerikazanım yatırımının karlı olduğunu işaret etmektedir.
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    Öğe
    Evaluating Scientific Value of Geodiversity for Natural Protected Sites: the Biga Peninsula, Northwestern Turkey
    (Springer Heidelberg, 2018) Cetiner, Ziya Sedat; Ertekin, Can; Yiğitbaş, Erdinç
    This study aims to report on an inventory of geodiversity features of natural protected sites distributed in the Biga Peninsula in Northwestern Anatolia (Turkey). There are 37 natural sites with their own data sets. Data of the sites describing their boundaries and administrative features were acquired from the national authority. The criteria scale was established for geoscience value for the methodology applied. A conceptual (qualitative) geosite inventory was established for intrinsic geosite potential according to representativeness, rarity, integrity, and scientific knowledge. Then, a semi-quantitative assessment was carried out to compare and parameterize the potential geosites in the scope of representativeness, key locality, geological diversity, rarity, integrity, scientific knowledge, and limitations. From these results, a total of seven sites is highlighted due to their scores for different geodiversity assets. The sites located inland represent endogenous assets labeled lithological, fault, or geothermal, whereas the sites located along the coast are dominated by their exogenous asset (lagoon formation) or simply a geomorphological feature.