A model for calculating the erosion distance of soft sea cliff under wave loading
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摘要: 基于波浪作用下软质海崖的侵蚀机理,考虑波浪水动力和海崖土质条件,建立了一种波浪作用下软质海崖侵蚀量的计算模型,利用室内水槽试验进行验证和参数回归,并使用该模型计算了平潭岛东北部软质海崖的侵蚀状况,与实测数据进行对比分析。研究发现:(1)海崖最大侵蚀量基本发生在静水位线处,随波浪持续作用,最大侵蚀量位置有所上移,当波浪持续作用一定时间时侵蚀基本停止;(2)当波高超过某一临界值时,侵蚀才会发生,而波高非常大的波浪对侵蚀的贡献相对不是很大;(3)平潭岛东北部的两处海崖,每次强台风连续作用8h时的侵蚀距离计算值为0.31m和0.25m。Abstract: A model for calculating the erosion distance of soft sea cliff under wave loading is established based on the erosion mechanism of soft sea cliff under wave loading and for considering wave hydrodynamic and sea cliff material parameters. The model is verified, and the parameters are regressed using an indoor flume experiment. The erosion distances of the sea cliff in the northeast of the Pingtan Island are calculated by the model, and the results are compared with the measured data. The maximum erosion occurs in static water level, the location of the maximum erosion moves up as the wave continues, and the erosion stops when the wave lasts for a period of time. The erosion does not occur until the wave height exceeds a critical value; however, the contribution of large waves to the erosion is not relatively substantial. The calculated erosion distances at two places in the northeast of Pingtan Island are 0.32 m and 0.26 m.
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Key words:
- wave /
- soft sea cliff /
- erosion
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Balsillie J H, Tanner W F. 2000. Red flags on the beach; part Ⅱ. Journal of Coastal Research, 16(3):3-5 Bray M J, Hooke J M. 1997. Prediction of soft-cliff retreat with accelerating sea-level rise. Journal of Coastal Research, 13(2):453-467 Cai Aizhi, Gong Jinmei, Cai Yue'e. 1992. Transgression and eolian sand sequence in Luyuanpu Plain, Haitan Island, Fujian. Journal of Oceanography in Taiwan Strait, 11(2):112-117 Compilation Committee of Chinese Bay. 1994. Chinese Bay, Volume VⅡ (in Chinese). Beijing:China Ocean Press, 166-169 Das B M. 1979. Introduction to Soil Mechanics. Ames:The Iowa State University Press, 7-30 Eagleson P S, Dean R G. 1966. Small amplitude wave theory. In:Ippen A T, ed. Estuary and Coastline Hydrodynamics. New York:McGraw-Hill, 20-21 Erikson L H, Larson M, Hanson H. 2007. Laboratory investigation of beach scarp and dune recession due to notching and subsequent failure. Marine Geology, 245(1-4):1-19 Fisher J S, Overton M F. 1984. Numerical model for dune erosion due to wave uprush. In:Proceedings of the 19th Coastal Engineering Conference. Houston:Coastal Engineering, 1553-1558 Gelinas P J, Quigley R M. 1973. The influence of geology on erosion rates along the north shore of Lake Erie. In:Wilson J B, Roff J, eds. Proceedings of the 16th Conference on Great Lakes Research.Minnesota:International Association Great Lakes Research. 421-430 Hampton M A. 2002. Gravitational failure of sea cliffs in weakly lithified sediment. Environmental & Engineering Geoscience, 8(3):175-191 Lee E M. 1997. Landslide risk management:key issues from a British perspective. In:Cruden D M, Fell R, eds. Landslide Risk Assessment. Rotterdam:Balkema, 227-237 Lee E M, Hall J W, Meadowcroft I C. 2001. Coastal cliff recession:the use of probabilistic prediction methods. Geomorphology, 40(3–4):253-269 Liu Jianhui. 2010. Analysis of mechanism and influencing factors of coastal erosion in Fujian Province (in Chinese)[dissertation]. Qingdao:Ocean University of China Liu Jianhui, Cai Feng, Lei Gang, et al. 2010. Recession mechanic and process analysis of soft cliff on Fujian coast-In case of northeast coast of Pingtan Island. Marine Environmental Science (in Chinese), 29(4):525-530 Mano A, Suzuki S. 1998. A dimensionless parameter describing sea cliff erosion. In:Proceedings of the 26th International Conference on Coastal Engineering. American Society of Civil Engineers, Copenhagen,American Society of Civil Engineers. 2520- 2533 Nishi R, Kraus N. 1996. Mechanism and calculation of sand dune erosion by storms. In:Proceedings of the 25th Coastal Engineering Conference. Orlando, Coastal Engineering, 3034-3047 Notle K G, Hsu F H. 1972. Statistics of Ocean Wave Groups. In:Offshore Technology Conference. Dellas, Texas. Offshore Technology Conference, 637-644 Overton M F, Pratikto W A, Lu J C, et al. 1994. Laboratory investigation of dune erosion as a function of sand grain size and dune density. Coastal Engineering, 23(1-2):151-165 Sunamura T. 1977. A relationship between wave-induced cliff erosion and erosive force of waves. The Journal of Geology, 85(5):613-618 Sunamura T. 1982. A predictive model for wave-induced cliff erosion, with application to Pacific coasts of Japan. The Journal of Geology, 90(2):167-178 Sunamura T. 1992. The Geomorphology of Rocky Coasts. Chichester, UK:Wiley, 301-302 The First Harbor Survey and Design Engineering Institute of Ministry of Transportation. 1997. Port Engineering Design Manual (Middle Volume)(in Chinese). Beijing:People's Traffic Press, 31-41 Trenhaile A S. 2009. Modeling the erosion of cohesive clay coasts. Coastal Engineering, 56(1):59-72 Trenhaile A S. 2010. Modeling cohesive clay coast evolution and response to climate change. Marine Geology, 277(1-4):11-20 Trenhaile A S, Pepper D A, Trenhaile R W, et al. 1998. Stacks and notches at Hopewell Rocks, New Brunswick, Canada. Earth Surface Processes and Landforms, 23(11):975-988 Wang Lirong, Zhao Huanting, Song Chaojing, et al. 2002. Coastal geomorphic evolution at the Denglou Cape, the Leizhou Peninsula. Acta Oceanologica Sinica, 21(4):597-611 Wen Shengchang, Yu Zhouwen. 1984. Wave Theory and Calculation Principles (in Chinese). Beijing:Science and Technology Press, 177-195 Young A P, Ashford S A. 2008. Instability investigation of cantilevered seacliffs. Earth Surface Processes and Landforms, 33(11):1661-1677
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