Determining the stability of vertical breakwaters against sliding based on individual sliding distances during a storm |
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| Institution: | 1. Department of Civil and Environmental Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of Korea;2. Department of Civil and Environmental Engineering & Integrated Research Institute of Construction and Environmental Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of Korea;1. UMR 7266 LIENSs CNRS-Université de La Rochelle, Institut du Littoral et de l''Environnement, 2 rue Olympe de Gouges, 17000 La Rochelle, France;2. National Civil Engineering Laboratory, Av. do Brasil 101, 1700-066 Lisbon, Portugal;3. BGS IT&E GmbH, D-64297 Darmstadt, Pfungstaedter Strasse 37, Germany;4. Virginia Institute of Marine Science, Gloucester Point, VA, USA;1. MARUM, Center for Marine Environmental Sciences, Universität Bremen, Germany;2. Department of Earth and Ocean Sciences, University of Waikato, New Zealand;1. Department of Civil, Environmental and Infrastructure Engineering, George Mason University, 4400 University Drive, MS 6C1, Fairfax, VA 22030, USA;2. Department of Civil and Environmental Engineering, Virginia Tech, 750 Drillfield Drive, 221E Patton Hall, Blacksburg, VA 24061, USA;3. Department of Civil Engineering, Texas A&M University, 3136 TAMU, College Station, TX 77843-3136, USA;1. Forschungszentrum Küste, Leibniz Universität Hannover, Merkurstraße 11, 30419 Hannover, Germany;2. Department of Ocean Engineering, Indian Institute of Technology, Madras, Chennai 600-036, India;3. Leichtweiß-Institute for Hydraulic Engineering, Technische Universität Braunschweig, Beethovenstraße 51A, 38106 Braunschweig, Germany;1. Earth System Science Organisation (ESSO)-Indian National Centre for Ocean Information Services (INCOIS), Hyderabad 500 090, India;2. Department of Ocean Engineering and Naval Architecture, Indian Institute of Technology Kharagpur, Kharagpur 721 302, India;3. Department of Marine & Ecological Sciences, Florida Gulf Coast University, Fort Myers, FL 33965, USA |
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| Abstract: | In this paper, the occurrence rate of caisson sliding of a vertical breakwater during a storm and the probabilistic distribution of the individual sliding distances are derived as functions of such important design variables as water depth, significant wave height, and caisson width. The expressions for various representative sliding distances such as the significant sliding distance are also derived. The derived statistical characteristics of individual sliding distances are then used for calculating the first passage probability of an allowable individual sliding distance during a storm. A method is also proposed to calculate the time-dependent first passage probability for the case where wave climate and mean water depth change with time. Finally, tentative design criteria for the allowable individual sliding distance are proposed. The proposed method is applied to fictitious breakwaters in different water depths near the Port of Hitachinaka in Japan. The time-dependent first passage probability is calculated for the next 50 years in which the wave height may increase due to climate change. The first passage probability increases as time elapses, as the water depth increases, and as the allowable individual sliding distance decreases. Comparison with a previous study that uses a performance-based design method shows that the allowable first passage probability should be in the range between 0.05 and 0.09. For the proposed method to be used in a practical design, however, more detailed study should be made to determine the allowable values of individual sliding distance, first passage probability, and representative sliding distance, by comparing with current design methods. |
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