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  • Küçük Resim
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    Modelling the relationship between water level and vertical displacements on the Yamula Dam, Turkey
    (Natural Hazards and Earth System Sciences, 2007) Bayrak, Temel
    onitoring deformation pattern of dams is often one of the most effective ways to understand their safety status. The main objective of the study is to find the extent to which rising reservoir level affects the mechanism of deformation of The Yamula Dam under certain change in the reservoir level conditions during to the first filling period. Three different deformation analysis techniques, namely static, kinematic and dynamic, were used to analyze four geodetic monitoring records consisting of vertical displacements of nine object points established on the Dam and six reference points surrounding of it, to see whether the rising reservoir level have a role in the vertical deformations during the first filling period. The largest vertical displacements were in the middle of the dam. There is an apparent linear relationship between the dam subsidence and the reservoir level. A dynamic deformation model was developed to model this situation. The model infers a causative relationship between the reservoir level and the dam deformations. The analysis of the results determines the degree of the correlation between the change in the reservoir level and the observed structural deformation of the dam.
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    Remote sensing and GIS-based landslide susceptibility mapping using frequency ratio and analytical hierarchy methods in Rize province (NE Turkey)
    (Springer Nature, 2012) Reis, Selçuk; Atasoy, Mustafa; Nişancı, Recep; Bayrak, Temel; Erduran, Murat; Sancar, Cenap; Ekercin, Semih
    The northeast part of Turkey is prone to landslides because of the climatic conditions, as well as geologic and geomorphologic characteristics of the region. Especially, frequent landslides in the Rize province often result in significant damage to people and property. Therefore, in order to mitigate the damage from landslides and help the planners in selecting suitable locations for implementing development projects, especially in large areas, it is necessary to scientifically assess susceptible areas. In this study, the frequency ratio method and the analytical hierarchy process (AHP) were used to produce susceptibility maps. Especially, AHP gives best results because of allowing better structuring of various components, including both objective and subjective aspects and comparing them by a logical and thorough method, which involves a matrix-based pairwise comparison of the contribution of different factors for landslide. For this purpose, lithology, slope angle, slope aspect, land cover, distance to stream, drainage density, and distance to road were considered as landslide causal factors for the study area. The processing of multi-geodata sets was carried out in a raster GIS environment. Lithology was derived from the geological database and additional field studies; slope angle, slope aspect, distance to stream, distance to road and drainage density were invented from digital elevation models; land cover was produced from remote sensing imagery. In the end of study, the results of the analysis were verified using actual landslide location data. The validation results showed satisfactory agreement between the susceptibility map and the existing data on landslide locations.
  • Küçük Resim
    Öğe
    Yamula barajındaki düşey deformasyonların jeodezik yöntemlerle izlenmesi
    (Harite ve Kadastro Mühendisleri Odası, 2006) Bayrak, Temel
    Kayseri iline 35 km uzaklıkta Kızılırmak nehri üzerinde inşa edilmiş olan Yamula barajının zamansal davranışı yapımından itibaren 1,5 yıl sürecinde gerçekleştirilmiş dört periyotjeodezik ölçü ile izlenmiştir. Su seviyesinin yükselmesine bağlı olarak barajın düşey yönde gerçekleşen deformasyonlarının belirlenmesi amacıyla, çalışmada, biri statik ve diğeri kinematik olmak üzere iki farklı deformasyon analizi yöntemi kullanılmıştır. Sonuçlar baraj üzerindeki tüm noktaların hareket halinde olduğunu göstermiştir. Kinematik yöntem sonuçları, özellikle baraj ortasındaki noktaların su seviyesinin yükselmesine bağlı olarak anlamlı bir ivmeli hareket sergilediklerini ortaya koymuştur. Çizilen grafikler, su seviyesinin yükselmesi ile baraj üzerindeki kontrol noktalarının düşey deformasyonlan arasında bir lineer ilişkinin var olduğunu ortaya koymuştur.