Effect of Sea Level Rise on Sliding Distance of a Caisson Breakwater — Optimization With Probabilistic Design Method

Okayasu, Akio; Sakai, Kazuhiko

doi:10.1142/9789812709554_0409

Cited by 9 publications

(7 citation statements)

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“…Studying the effects of climate change on coastal and harbor structures started receiving considerable attention since the early 21st century [16][17][18]. Suh et al [19] developed a methodology that incorporates the effects of climate change in the design of caisson breakwaters.…”

Section: Literature Reviewmentioning

confidence: 99%

“…where K t is the transmission coefficient estimated utilizing Equations (21a) and (21b) [74,76]. Equation (17) can again be used as the reliability function for toe stability, Z 43 . According to DELOS Project Guidelines [78] for environmental design of low-crested coastal defense structures, it is recommended to select the stone size of the low-crested structure utilizing the formula:…”

Section: Construction Of a Low-crested Structure In Front Of Existingmentioning

confidence: 99%

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Optimized Reliability Based Upgrading of Rubble Mound Breakwaters in a Changing Climate

Γαλιατσάτου¹,

Makris²,

Prinos³

2018

JMSE

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The present work aims at presenting an approach on implementing appropriate mitigation measures for the upgrade of rubble mound breakwaters protecting harbors and/or marinas against increasing future marine hazards and related escalating exposure to downtime risks. This approach is based on the reliability analysis of the studied structure coupled with economic optimization techniques. It includes the construction of probability distribution functions for all the stochastic variables of the marine climate (waves, storm surges, and sea level rise) for present and future conditions, the suggestion of different mitigation options for upgrading, the construction of a fault tree providing a logical succession of all events that lead to port downtime for each alternative mitigation option, and conclusively, the testing of a large number of possible alternative geometries for each option. A single solution is selected from the total sample of acceptable geometries for each upgrading concept that satisfy a probabilistic constraint in order to minimize the total costs of protection. The upgrading options considered in the present work include the construction or enhancement of a crown wall on the breakwater crest, the addition of the third layer of rocks above the primary armor layer of the breakwater (combined with crest elements), the attachment of a berm on the primary armor layer, and the construction of a detached low-crested structure in front of the breakwater. The proposed methodology is applied to an indicative rubble mound breakwater with an existing superstructure. The construction of a berm on the existing primary armor layer of the studied breakwater (port of Deauville, France), seems to be advantageous in terms of optimized total costs compared to other mitigation options.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Construction Of a Low-crested Structure In Front Of Existingmentioning

confidence: 99%

Optimized Reliability Based Upgrading of Rubble Mound Breakwaters in a Changing Climate

Γαλιατσάτου¹,

Makris²,

Prinos³

2018

JMSE

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“…Coastal structures are directly influenced by the sea level rise. The effects of water depth increase and wave height change due to sea level rise on the performance and stability of coastal structures have been investigated (Klein et al 1998;Southerland and Wolf 2002;Okayasu and Sakai 2006;Stern 2006;Torresan et al 2008;Wigley 2009;Reeve 2010;Takagi et al 2011;Chini and Stansby 2012;Suh et al 2012;Suh et al 2013;Lee et al 2013). However, most of these studies has been performed for a specific site using the sea level rise under a specific emission scenario so that it is difficult to use the result in different sites subject to different sea level rises.…”

Section: Introductionmentioning

confidence: 99%

Change of Nearshore Significant Waves in Response to Sea Level Rise

Cheon

Suh

2014

Int. Conf. Coastal. Eng.

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In this paper, a method has been developed for estimating the change of nearshore significant waves in response to long-term sea level rise, by extending the method proposed for regular waves by Townend in 1994. The relative changes in wavelength, refraction coefficient, shoaling coefficient, and wave height for random waves are presented as functions of the relative change in water depth. The changes in wavelength and refraction coefficient are calculated by using the significant wave period and principal wave direction in the formulas for regular waves. On the other hand, the changes in shoaling coefficient and wave height are calculated by using the formulas proposed for transformation of random waves in the nearshore area including the surf zone. The results are presented in the form of both formulas and graphs. In particular, the relative change in significant wave height is compared with the result for regular waves.

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“…Okayasu and Sakai [2006] carried out simulations of the effect that sea level rise would have on the stability of caisson type breakwaters and found that this would bring about a decrease in stability of up to 50%, which was more significant for the bigger sea level increase scenarios. Apart from this, it is well known that increases in wind speeds result in higher waves, though to date the authors are not aware of any research that has been carried out on the consequences of the double effect that increases in sea level and wave height would have on the overall stability of breakwaters.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Future Stability of Breakwaters Under Climate Change

Takagi

Kashihara

Esteban

et al. 2011

Coastal Engineering Journal

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Climate change is expected to lead to increases in both sea level and typhoon intensity, which could threaten the stability of breakwaters in the future. In this study, calculations using the SWAN model showed that a 10% potential increase in the future wind speed of typhoons resulting from the warming of surface sea temperatures can lead to a 21% increase in the significant wave heights generated by these winds. To understand the effect that this would have on breakwater stability, the expected sliding distances for the breakwaters at Shibushi Ports in Japan were estimated using a probabilistic design method. The results show that in the future the expected sliding distances may become five times greater than at present, due to a combination of increases in sea level and wave height. Keywords: Breakwater; probabilistic design method; expected sliding distance; climate change; SWAN model. 21 Coast. Eng. J. 2011.53:21-39. Downloaded from www.worldscientific.com by UNIVERSITY OF MICHIGAN on 02/03/15. For personal use only.

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Effect of Sea Level Rise on Sliding Distance of a Caisson Breakwater — Optimization With Probabilistic Design Method

Cited by 9 publications

References 0 publications

Optimized Reliability Based Upgrading of Rubble Mound Breakwaters in a Changing Climate

Optimized Reliability Based Upgrading of Rubble Mound Breakwaters in a Changing Climate

Change of Nearshore Significant Waves in Response to Sea Level Rise

Assessment of Future Stability of Breakwaters Under Climate Change

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