Yazar "Erenoglu, Oya" seçeneğine göre listele

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    Öğe
    A case study on the comparison of terrestrial methods and unmanned aerial vehicle technique in landslide surveys: Sarıcaeli landslide, Çanakkale, NW Turkey
    (Cem GAZİOĞLU, 2018) Erenoglu, R. Cuneyt; Erenoglu, Oya
    Landslides are natural disasters with some effects in the natural environment of the Earth. A landslide has a structure that changes the natural topography boundaries by releasing the forest cover and vegetation. Heavy precipitation and seismic activities, as well as the mass movement that can be caused by landslides, trigger the possible tendency to move the soil. The formation of the current Digital Elevation model (DEM) of the area subject to landslides is important in terms of determining the direction, character and effects of the landslide. With the help of aerial photographs obtained by Unmanned Aerial Vehicle (UAV), the production of high resolution and accurate DEMs is becoming increasingly widespread. In this study, production and analysis of DEMs obtained from different dated flight data and reflecting the topography of an active landslide area were performed. Finally, it was compared with RTK-GNSS measurement results in landslide areas. According to the results obtained in the study, the production of DEM based on UAV provides higher accuracy at centimeter level. In addition, the method used is more efficient, faster and lower cost than other terrestrial techniques.
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    Öğe
    Determination of chemical weathering and profile development indexes of soils formed on volcanic rocks in the Biga Peninsula, NW Türkiye
    (Elsevier, 2025) Everest, Timucin; Erenoglu, Oya; Acar, Tugba Sokut; Temel, Erdem; Sungur, Ali; Ozcan, Hasan
    Chemical weathering and profile development indexes of soils formed on Ayvacik volcanites (pyroclastic, basalt, andesite, and ignimbrite) in the SW of Biga Peninsula were investigated in this study. Eight soil profiles (two representing each rock type) were excavated on soils formed on pyroclastic, basalt, andesite, and ignimbrite rocks. The profiles were described according to the Soil Survey Manual and classified according to the Soil Taxonomy and the World Reference Base (WRB). Within the study, morphological observations, physicochemical, oxide, and mineralogical analyses were conducted, thin-section interpretations were carried out, and chemical weathering and profile development indexes (PDI) were calculated. In addition, statistical analyses were performed on all data. Chemical index of alteration-CIA, Parker weathering index-WIP, chemical index of weathering-CIW, plagioclase index of alteration-PIA, silica-titania index-STI, bases/R2O3, product index-PWI, Vogt index-V and Ruxton ratio-R were calculated. Relationships between chemical weathering and profile development indexes were tested with multiple statistical evaluations. According to the results of multivariate analysis of covariance (MANCOVA) the effects between chemical weathering indexes and PDI were statistically significant with CIA, WIP, CIW, PWI, and V weathering indexes. In contrast, the impacts of PIA, STI, Bases/R2O3, and R weathering indexes were not significant. These relationships between chemical weathering and PDI were supported by thin section and mineralogical analysis. With the integration of PDI and chemical weathering indexes, WIP was found to be the most suitable weathering index for evaluating soils formed on pyroclastic and basalt rocks, while PWI was found to be suitable for andesite and ignimbrite rocks. These findings provide a robust framework for selecting appropriate weathering indexes tailored to specific volcanic rocks in pedogenetic studies.
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    Öğe
    Integrated geochemical, geoelectrical, and UAV-based methods for analyzing the Gzeylülaı landslide Çnkae(aakl, Tükyeri)
    (Tubitak Scientific & Technological Research Council Turkey, 2025) Erenoglu, Oya; Ulugergerli, Emin; Erenoglu, R. Cueneyt; Akbas, Abdullah; Erginal, A. Evren
    The number of reactivations increased in the G & uuml;zelyal & imath;-Erenk & ouml;y landslide area after 2013 in & Ccedil;anakkale, T & uuml;rkiye, where historical landslide activity has been recorded since 1875. This area is home to numerous summer residences and experiences ongoing slow-moving landslide activity along a 400-m-long slope, extending from the heavily trafficked & Ccedil;anakkale-& Idot;zmir highway to the coastline. In this study, the nature of the reactivations was evaluated by considering the conditioning and triggering factors that contributed to the landslide. The evaluation was based on geochemical analyses, field observations, geoelectric measurements, and unmanned aerial vehicle (UAV) data. The results revealed that the sliding occurred along a moist slip surface, rich in various clay minerals such as illite, montmorillonite, and vermiculite, at a depth of approximately 4.5 m, as determined by ERT (Electrical Resistivity Tomography). Vertical movements within the landslide area, including rises and subsidences, accounted for changes of up to 0.1 m between 2013 and 2023. Chemical Index of Weathering (CIW), Chemical Index of Alteration (CIA), and Plagioclase Index of Alteration (PIA) calculations obtained from the X-ray fluorescence (XRF) spectroscopy analysis indicate that the sliding surface is subjected to strong weathering, and these values are compatible with the X-Ray diffraction (XRD) data.