Polen - İTÜ Akademik Açık Arşive Hoş Geldiniz

Polen, İstanbul Teknik Üniversitesi akademik ve idari personeli, öğrencileri tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve yayınların etkisini artırmak için telif haklarına uygun olarak açık erişime sunar.

İTÜ Açık Erişim Sistemi, öğretim üyelerimiz ve öğrencilerimizin uluslararası standartlara ve fikri mülkiyet haklarına uygun olarak ürettikleri kitap, makale, tez, ansiklopedi, sanat eseri gibi bilimsel ve sanatsal ürünleri sunmaktadır.

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Açık Ders Kaynakları 30
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Akademik Çalışmalar 45362
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Arşiv Koleksiyonu 603
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Temel Kayıtlar 2825
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Erişim durumu: Sadece Metadata ,
Assessing Post-Seismic Hillslope Stability with Finite Element Methods
(Copernicus GmbH, 2025-03-18) Yu Wang; Luigi Lombardo; Cees J. van Westen; Tolga Gorum; Abdüssamet Yılmaz; Hakan Tanyaş; Avrasya Yer Bilimleri Enstitüsü; Görüm, Tolga; Yılmaz, Abdüssamet
Earthquakes can induce a legacy effect on hillslopes by reducing rock mass shear strength through fracture development and cohesion loss, thereby increasing landslide susceptibility. While methods for modeling shear strength reduction exist, post-seismic landslide susceptibility assessments that account for this earthquake legacy effect remain unexplored. In this study, we address this gap by performing regional-scale slope stability analyses using Finite Element Methods (FEM). Focusing on the area affected by the 2023 T #252;rkiye earthquake, we conduct back-analyses to estimate the shear modulus of hillslopes that failed during the event. Using an empirical relationship for shear strength reduction, we estimate post-seismic shear strength and integrate these parameters into FEM simulations to evaluate hillslope deformation. The deformation results are subsequently used to assess landslide susceptibility across the region.This study represents the first application of FEM for regional-scale landslide susceptibility analysis, systematically accounting for changes in rock mass strength due to seismic events. The proposed framework enhances the accuracy and reliability of post-seismic slope stability assessments, providing a step forward in regional-scale, post-seismic landslide hazard evaluation.
Erişim durumu: Sadece Metadata ,
Analyzing the Influence of Spatial Variations on the Performance Metrics of a Rainfall Simulator
(Copernicus GmbH, 2025-03-18) Erdal Kesgin; Abdullah Emin Demircioğlu; Kadir Gezici; Selim Şengül; Remziye İlayda Tan Kesgin; İnşaat Mühendisliği Bölümü; Kesgin, Erdal
This study provides a comprehensive analysis of the significance of rainfall simulator (RS) in hydrological research and investigates the effects of spatial variations on rainfall parameters. Rainfall simulators enable detailed examination of environmental variables under controlled laboratory conditions without relying on natural rainfall. However, the assumption of homogeneity in parameters such as rainfall intensity, uniformity, and drop size can lead to the neglect of spatial variations within the study area, thereby limiting the accuracy of the results. This limitation is particularly critical in studies focused on erosion, drainage, and infiltration, where spatial variations play a key role and may lead to misleading conclusions. In this study, performance parameters were evaluated across nine sub-regions along the simulator channel under four different rainfall intensities (40, 70, 80, and 100 mmh #8315; #185;). The effects of rainfall intensity on spatial uniformity and drop size were thoroughly analyzed. The findings reveal significant spatial variations in rainfall distribution. Notably, higher rainfall intensities were recorded in the middle regions resulting in higher uniformity values in these areas. Although the evaluation of uniformity coefficients for the entire area under 40 mmh #8315; #185; and 70 mmh #8315; #185; rainfall intensities yielded debatable results, sub-area analyses indicated that this uniformity did not hold true for the majority of the channel. Overall, a predominantly uniform rainfall distribution ( 80%) was observed. Regarding drop sizes, spatial differences were identified, with a slight increase in drop size as rainfall intensity increased. These findings emphasize that treating rainfall parameters as a single fixed value for the entire study area may fail to fully capture the dynamic nature of natural rainfall. Considering spatial variations is essential for achieving more reliable and accurate results
Erişim durumu: Sadece Metadata ,
Reliability-Based Analysis of Initiation of Sediment Motion on Movable Bed
(Copernicus GmbH, 2025-03-18) Selman Baysal; V. Ş. Özgür Kırca; Manousos Valyrakis; İnşaat Mühendisliği Bölümü; Kırca, Veysel Şadan Özgür; Baysal, Selman
Sediment transport dynamics are of great importance in understanding geophysical flows, where determining the threshold conditions for the initiation of sediment motion presents a complex challenge. In a pioneering work, Shields (1936) established the Shields #8217; criterion to assess the critical shear stress ( #964;c) required for sediment motion in non-turbulent flows. Although this approach has significant advantages, including a robust empirical foundation and the implementation of non-dimensional critical shear stress, it is valid for limited conditions since it oversimplifies vital aspects such as sediment heterogeneity and complex flow interactions.In turbulent flows, the effective critical shear stress acting on a grain may become higher than that measured in the case of laminar flows (i.e., the average critical stress, #964;c, defined by Shields, 1936) as a result of fluctuations in the shear stress ( #964; #8242;). Owing to this, in geophysical turbulent flows near the threshold of motion, neither the driving nor the resisting parameters of sediment motion have crisp values; instead, they may be considered probabilistic parameters. The reliability-based approach is applied here in to handle the complex nature of the initiation of sediment motion.This study aims to present preliminary results of research that aims to enhance the knowledge of incipient motion by applying a reliability-based analysis of Shields #8217; criterion based on the theory and empirical equations adopted by Zanke (2003). In this analysis, the turbulence parameter (n) and angle of repose ( #981;) are introduced as key parameters regarding the initiation of sediment motion. These parameters are generated as random variables by means of Monte Carlo Simulations, introducing various probabilistic distributions (e.g., normal, log-normal, triangular, gamma) and statistical moments (e.g., mean, standard deviation).By simulating a wide range of angles of repose and turbulence parameters with Monte Carlo Simulations, the inherent uncertainties in sediment transport and the complexity of hydrodynamic models are incorporated. In this work critical shear stresses of thousands of grains are assessed for different grain Reynolds numbers. As a result, threshold of motion curves are probabilistically derived, indicating confidence for grain entrainment, and establishing a model that enables risk assessment and decision-making for a wide range of scenarios. Comparisons of model results with empirical data show that the model captures the complex physical process.
Erişim durumu: Sadece Metadata ,
Effects of Liquid Sloshing in Storage Tanks: An Overview of Analytical, Numerical, and Experimental Studies
(Springer Science and Business Media LLC, 2025-03-18) Emre Gani; Sezer Öztürk; Ali Sari; Taner Mustafa Cengiz; İnşaat Mühendisliği Bölümü; Sarı, Ali
Liquid storage tanks are essential components widely used across various industrial sectors. In addition to the internal liquid pressure and weight, these tanks are influenced by several external factors, such as wind, seismic activity, and temperature. The sloshing problem, which arises from the combined or individual effects of these external factors, presents a significant challenge for liquid storage tanks. This study aims to investigate sloshing phenomena by focusing on prominent studies in the literature. In the initial sections of the study, sloshing behaviour and key parameters are briefly introduced, followed by a discussion of the methods related to the modelling of sloshing. Subsequently, literature studies focusing on cylindrical and rectangular upright tanks related to sloshing are compiled under the headings of analytical, numerical, and experimental research. In the section presenting the experimental studies, works related to mitigation of sloshing effects are examined as a separate topic. As a result of the review conducted, topics that have received significant attention in the literature and other areas suitable for new research have been discussed. © The Author(s) 2025.
Erişim durumu: Sadece Metadata ,
Transforming the Eastern Mediterranean: The Aegean-Cyprus Slab Tear
(Copernicus GmbH, 2025-03-18) Xiaowen Liu; Russell Pysklywec; Oğuz Göğüş; Ebru Şengül; Avrasya Yer Bilimleri Enstitüsü; Göğüş, Oğuz Hakan
The Aegean and Western Anatolian region has experienced widespread extension since the Late Oligocene, characterized by southward migration of arc volcanism, exhumation, and basin formation. Recent seismic data have revealed a significant tear between the subducted Aegean and Cyprus slabs. Such a tear is expected to disrupt local mantle flow, yet its impact on surface processes like topography, deformation, and magmatism remains poorly understood. In this study, we develop 4D geodynamic models to explore the effects of slab tearing in this part of the eastern Mediterranean region. Our model results demonstrate that tear-induced mantle flow aligns closely with a range of geological and geophysical observations, including a counterclockwise toroidal flow beneath Western Anatolia. The slab tearing also triggers rapid transient mantle upwelling, resulting in dynamic topographical uplift. Additionally, it facilitates the influx of hot asthenosphere from behind the subducted slab, promoting partial melting and widespread magmatism across the region. The model further indicates that the overlying continent is under extension, with the extension direction transitioning from NE-SW in Western Anatolia to N-S towards the Aegean trench. Our findings reconcile with observed geological anomalies in the Aegean zone and Western Anatolia, such as the distribution of volcanic activity and patterns of crustal deformation. This correlation not only validates our model but also provides new insights into the complex interactions between slab dynamics and surface expressions, enhancing our understanding of how slab discontinuities manifest geological phenomena.