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Kim, J.O. and Lee, J.K., 2021. Urban flood inundation simulation based on high-precision 3D modeling. In: Lee, J.L.; Suh, K.-S.; Lee, B.; Shin, S., and Lee, J. (eds.), Crisis and Integrated Management for Coastal and Marine Safety. Journal of Coastal Research, Special Issue No. 114, pp. 454–458. Coconut Creek (Florida), ISSN 0749-0208. Flooding is a frequently occurring climate-related natural disaster that affects several people worldwide. In recent years, severe natural disasters have occurred due to unusual weather, and the damage caused by such disasters has increased significantly because of high population densities and the presence of large buildings in coastal urban areas. The spatial characteristics of urban floods are becoming more complex due to widespread changes in land use, such as in the construction of buildings, roads, and drainage networks. In particular, factors that affect urban flood modeling include the location and geometry of buildings. Hydrological models can adequately simulate both surface and subsurface processes at the watershed level; however, most models cannot accurately simulate urban flooding without 3D city modeling. A 3D simulation of computation results is thus necessary for practical applications. In recent years, flood simulation technology has been used to build 3D virtual environments based on data such as high definition (HD) maps, LiDAR point clouds, and drone images. The primary objective of this study was to develop and simulate an urban flood based on 3D city modeling. The 3D city model was tested for a coastal city in the Republic of Korea. Results of case studies indicate a reasonable match between the observed and modeled flood spatial extents and highlight the importance of considering 3D city models in urban flood simulations. [ABSTRACT FROM AUTHOR]

Lee, J.K.; Kim, J.O., and, Oh, Y.S. 2021. Development of coastal safety mapping system by vulnerability assessment of tidal creeks. In: Lee, J.L.; Suh, K.-S.; Lee, B.; Shin, S., and Lee, J. (eds.), Crisis and Integrated Management for Coastal and Marine Safety. Journal of Coastal Research, Special Issue No. 114, pp. 459–463. Coconut Creek (Florida), ISSN 0749-0208. Most coastal accidents occur in coastal areas with heavy traffic, or crowded beaches and tidal flats. In Korea, various leisure activities are conducted throughout the year on beaches. A significant increase in the number of coastal area workers has led to a corresponding increase in the risk of accidents; this makes the employment of effective countermeasures a necessity. A coastal safety map integrates spatial information of dangerous areas and hazards to prevent accidents in the ocean. In addition to its use for safe expansion of coastal leisure activities, coastal safety maps can be used for the prevention of disasters caused by sea conditions such as tidal creeks, heavy swells, and rip currents. In this study, a tidal creek map was created using an Unmanned Aerial Vehicle (UAV) to express the shape of a tidal creek in three dimensions. We designed and implemented a mapping system that identifies places with a high potential for human accidents in tidal flats. The system uses computer vision technology to identify the shape and location of the tidal channel and extract areas with a high probability of accidents, contributing to the development and implementation of comprehensive safety measures. [ABSTRACT FROM AUTHOR]