An experimental study on the reshaping of berm breakwaters under irregular wave attacks |
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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. College of Marine Science and Engineering, Nanjing Normal University, Nanjing 210046, China;2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China;3. Yellow River Institute of Hydraulic Research, YRCC, Zhengzhou 450003, China;1. IMDC, Van Immerseelstraat 66, Antwerpen 2018, Belgium;3. Flanders Hydraulics Research, Antwerp 2140, Belgium;4. School of Geographical and Earth Sciences, University of Glasgow, Glasgow G128QQ, UK;5. Leibniz University Hannover, Ludwig Franzius Institute for Hydraulic, Estuarine and Coastal Engineering, Nienburger Str. 4, Hannover, Germany;6. Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK |
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| Abstract: | The main idea concerned with the design of berm breakwaters is to construct a less expensive structure with reshaping berm. An experimental study on the front slope stability of homogeneous berm breakwaters has been carried out in a large number of 2D model tests at Tarbiat Modares University. In this paper, the results of this experimental study are presented conjointly with a formula for estimation of berm recession as the most important parameter for describing the reshaping. This includes the influence of wave height and period, storm duration, berm width and elevation variations on the stability of berm breakwater with different armor stone sizes. A total of 222 tests have been performed to cover the impact of these parameters. According to the present research, one can observe that considering different armor stone sizes, berm width is a significant parameter concerning reshaping of a berm breakwater that has not been covered in previous works, so that as the berm width increases the amount of berm recession decreases. To assess the validity of the present formula, comparisons are made between the estimated berm recessions by this formula and formulae given by other researchers, showing that the estimation procedure foretells berm recession well according to the present data. It is observed that the recession estimated by the present formula has comparatively better correlation with the present experimental data, and also with other experimental results within the range of parameters tested. |
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