On front slope stability of berm breakwaters |
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| Institution: | 1. University of Naples Federico II, Department of Civil, Architectural and Environmental Engineering, Via Claudio 21, 80125 Naples, Italy;2. Laboratório Nacional de Energia e Geologia, I.P., Estrada do Paço do Lumiar, 22, 1649-038 Lisbon, Portugal;3. CERENA, Instituto Superior Técnico, Department of Bioengineering, Universidade de Lisboa, Avenida Rovisco Pais 1, 1049-001 Lisbon, Portugal;1. College of Water Sciences, Beijing Normal University, Beijing, 100875, China;2. College of Water Resources and Civil Engineering, China Agricultural University, Beijing, 100083, China;1. National Research Institute of Fisheries Engineering, Japan Fisheries Research and Education Agency, Hasaki, Kamisu, Ibaraki, 314-0408, Japan;2. Choshi Branch, International Meteorological and Oceanographic Consultants Co. Ltd, Kawaguchicho, Choshi, Chiba, 288-0001, Japan;3. Fisheries Research Division, Tokushima Agriculture, Forestry and Fisheries Technology Support Center, Dounoura, Seto, Naruto, Tokushima, 771-0361, Japan;1. Department of Civil Engineering, ISE-UAlg, Campus da Penha, 8005-139 Faro, Portugal;2. CIMA - Centre for Marine and Environmental Research, University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal |
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| Abstract: | The short communication presents application of the conventional Van der Meer stability formula for low-crested breakwaters for the prediction of front slope erosion of statically stable berm breakwaters with relatively high berms. The method is verified (Burcharth, 2008) by comparison with the reshaping of a large Norwegian breakwater exposed to the North Sea waves. As a motivation for applying the Van der Meer formula a discussion of design parameters related to berm breakwater stability formulae is given. Comparisons of front erosion predicted by the use of the Van der Meer formula with model test results including tests presented in Sigurdarson and Van der Meer (2011) are discussed. A proposal is presented for performance of new model tests with the purpose of developing more accurate formulae for the prediction of front slope erosion as a function of front slope, relative berm height, relative berm width, method of armour stone placement, and hydraulic parameters. The formulae should cover the structure range from statically stable berm breakwaters to conventional double layer armoured breakwaters. |
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