Browsing by Author "Duzgun, Sebnem"

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    Development of a Tsunami Inundation Map in Detecting Tsunami Risk in Gulf of Fethiye, Turkey
    (Springer Basel Ag, 2015) Dilmen, Derya Itir; Kemec, Serkan; Yalciner, Ahmet Cevdet; Duzgun, Sebnem; Zaytsev, Andrey
    NAMIDANCE tsunami simulation and visualization tool is used to create tsunami inundation maps showing quantitative maximum tsunami flow depths in Fethiye. The risk of an extreme, but likely earthquake-generated tsunami is estimated at Fethiye Bay for 14 probabilistic earthquake scenarios. The bay is located 36A degrees 39'5aEuro(3)N 29A degrees 7'23aEuro(3)E, southwestern Turkey, which has coastline to the eastern Mediterranean Sea. The tsunami simulation and inundation assessment are performed in three stages: (1) formation of a digital elevation model of the region from the best available topography/bathymetry dataset, (2) estimation of a maximum credible tsunami scenario for the region and determination of related earthquake parameters, (3) high resolution tsunami simulation and computation of near shore and overland tsunami dynamics in the study area using tsunami simulation and visualization code NAMIDANCE, (4) determination of spatial distributions of tsunami characteristics (maximum water elevations, water velocities, flow depths) under the critical tsunami condition. The results are based on the most recent descriptions of potential tsunami sources, topographic and bathymetric databases, and tsunami numerical models. We present an innovative study concentrating on preparation of quantitative flow depths and inundation maps with a very high-resolution bathymetry/topographic dataset in the eastern Mediterranean. Inundation maps will be used to analyze the effects of possible tsunamis. The presented research is crucial to raising the awareness of government officials, the public, and other stake holders about the high probability of a tsunami event in Turkey. Moreover, the results of this study will help to plan for evacuation routes, establish safe zones, and assist in preparation for the tsunami, creating public awareness, and planning evacuation routes before the actual tsunami event happens.
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    A New Lod Definition Hierarchy for 3d City Models Used for Natural Disaster Risk Communication Tool
    (Bulgarian Cartographic Assoc, 2012) Kemec, Serkan; Zlatanova, Sisi; Duzgun, Sebnem
    Taking precautions before a disaster to reduce the causalities and losses engendered by natural disasters is relatively cheaper, and more importantly, better than cure. The authors propose a conceptual framework with the consideration of all stakeholders related to the disaster management to have a better risk management, and to guide the design, implementation and integration of the 3D urban modeling tools into disaster risk visualization. In this study, a new indoor LoD hierarchy is proposed for building objects. The LoD definitions of CityGML are only for the external parts of the city structures and the indoor is modeled in one LoD only. Similar to the outdoor definitions of CityGML, the proposed indoor LoD definitions aim to achieve robust definitions. This framework allows visualization in all the possible 3D urban disaster situations.