Laboratory and Numerical Studies of Hydrodynamics Near Jetties

Demirbilek, Zeki; Lin, Lihwa; Seabergh, William C.; Mase, Hajime; Zheng, Jinhai

doi:10.1142/s0578563409001989

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…Note that within the cross-shore transects, the wave height and cross-shore profiles are offset by a number as indicated to the left of each transect, which are plotted using different colors. Demirbilek et al (2009) reported similar results for the wave height using a previous version of CMS. Due to the inclusion of the surface roller and Stokes velocities, the current velocities reported here are significantly improved with respect to Demirbilek et al (2009).…”

Section: Resultssupporting

confidence: 62%

See 1 more Smart Citation

A revisit and update on the verification and validation of the Coastal Modeling System (CMS) : report 1--hydrodynamics and waves

Li¹,

Lin²,

Johnson³

et al. 2022

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This is the first part of a two-part report that revisits and updates the verification and validation (V&V) of the Coastal Modeling System (CMS). The V&V study in this part of the report focuses on hydrodynamic and wave modeling. With the updated CMS code (Version 5) and its latest graphical user interface, the Surface-water Modeling System (Version 13), the goal of this study is to revisit some early CMS V&V cases and assess some new cases on model performance in coastal applications. The V&V process includes the comparison and evaluation of the CMS output against analytical solutions, laboratory experiments in prototype cases, and field cases in and around coastal inlets and navigation projects. The V&V results prove that the basic physics incorporated are represented well, the computational algorithms implemented are accurate, and the coastal processes are reproduced well. This report provides the detailed descriptions of those test simulations, which include the model configuration, the selection of model parameters, the determination of model forcing, and the quantitative assessment of the model and data comparisons. It is to be hoped that, through the V&V process, the CMS users will better understand the model’s capability and limitation as a tool to solve real-world problems.

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Section: Resultssupporting

confidence: 62%

“…Demirbilek et al (2009) reported similar results for the wave height using a previous version of CMS. Due to the inclusion of the surface roller and Stokes velocities, the current velocities reported here are significantly improved with respect to Demirbilek et al (2009).…”

Section: Resultssupporting

confidence: 62%

A revisit and update on the verification and validation of the Coastal Modeling System (CMS) : report 1--hydrodynamics and waves

Li¹,

Lin²,

Johnson³

et al. 2022

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“…The Kahului east breakwater was designed to adsorb wave energy. Coastal structures that are designed for wave absorption rather than reflection are known to not induce water circulation cells (Demirbilek 2009). The lack of wave-induced currents, coupled with the large voids and shaded areas within the structure, partially explain why coral coverage on the seaward slope of the Kahului breakwater was sparse.…”

Section: Discussionmentioning

confidence: 99%

Ecological Engineering Considerations for Coral Reefs in the Design of Multifunctional Coastal Structures

Foley

Stender²,

Singh

et al. 2014

Int. Conf. Coastal. Eng.

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A multifunctional structure is being designed for the Kahului Harbor, Maui, Hawai'i, to mitigate operational problems caused by wave energy while also providing coral reef habitat. There is limited information on how the design of a coastal structure can be manipulated to enhance the ecology of targeted coral communities. To inform the ecological engineering of an artificial coral reef, the relationship between substrate characteristics and coral colonization was investigated through coral recruitment experiments and study of field conditions. Three concrete compositions that differed by the use of basalt, limestone, or recycled aggregates were tested in field and laboratory experiments to determine the impact of each substrate on the recruitment of juvenile hermatypic corals. The concrete test plates were deployed in three environments for a period of about one year, after which the coral recruits on each plate were identified and counted. No significant difference was found in the average number of coral recruits on the concrete mixed with basalt, limestone and recycled aggregate (60 ± 9, 83 ± 17 and 77 ± 14, respectively). Significant differences in coral recruitment were found due to the laboratory tanks, deep water, and shallow water field tests environments (86 ± 11, 135 ± 15 and 4 ± 1, respectively). These results highlight the importance of environmental site conditions for the development of coral reef habitat. A field study was conducted in the vicinity of purposed artificial reef site to relate the topographic features of the surrounding environment to the levels of live coral coverage. The benthic zone was surveyed using a drop camera system and by divers who recorded in-situ observations. Of the area surveyed, the highest density of coral coverage (>90% cover on 60% of the area) was found on an adjacent natural reef area that was characterized by spur and groove geomorphology with a high degree of macro-and microtopographic complexity. In contrast, sparse coral cover was discovered on the concrete armor units of the existing east breakwater structure, while no live coral cover was observed on the sand and carbonate rubble substrate at the proposed artificial reef location. The high degree of coral coverage on the adjacent natural reef suggests that the artificial coral reef design should emulate the natural spur and groove structure with regards to topographic complexity on multiple scales, orientation with wave direction, and water depth.

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“…A constant value of κ = 2.5 has been used by Mase et al (2001Mase et al ( , 2005aMase et al ( , 2005b to simulate wave diffraction for narrow and wide gap breakwater applications. Lin et al (2008) and Demirbilek et al (2009) demonstrate that value of κ = 4 is appropriate for semi-inifinite long breakwaters and also in narrow gaps (inlets) with openings equal or less than one wavelength. For wider gaps with the opening greater than one wavelength, κ = 3 is recommended.…”

mentioning

confidence: 99%

Rapid Calculation of Nonlinear Wave-Wave Interactions

Lin

Demirbilek

Zheng

et al. 2011

Int. Conf. Coastal. Eng.

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This paper presents an efficient numerical algorithm for the nonlinear wave-wave interactions that can be important in the evolution of coastal waves. Indeed, ocean waves truly interact with each others. However, because ocean waves can also interact with the atmosphere such as under variable wind and pressure fields, and waves will deform from deep to shallow water, it is generally difficult to differentiate the actual amount of the nonlinear energy transfer among spectral waves mixed with the atmospheric input and wave breaking. The classical derivation of the nonlinear wave energy transfer has involved tedious numerical calculation that appears impractical to the engineering application. The present study proposed a theoretically based formulation to efficiently calculate nonlinear wave-wave interactions in the spectral wave transformation equation. It is approved to perform well in both idealized and real application examples. This rapid calculation algorithm indicates the nonlinear energy transfer is more significant in the intermediate depth than in deep and shallow water conditions.

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Laboratory and Numerical Studies of Hydrodynamics Near Jetties

Cited by 7 publications

References 8 publications

A revisit and update on the verification and validation of the Coastal Modeling System (CMS) : report 1--hydrodynamics and waves

A revisit and update on the verification and validation of the Coastal Modeling System (CMS) : report 1--hydrodynamics and waves

Ecological Engineering Considerations for Coral Reefs in the Design of Multifunctional Coastal Structures

Rapid Calculation of Nonlinear Wave-Wave Interactions

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