Water oxygenation in the vicinity of coastal structures due to wave breaking

Moutzouris, C. I.; Daniil, Ekaterini I.

doi:10.1061/9780784400890.229

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…Experiments were performed in the wave¯ume of the LHW to study the transport of dissolved oxygen near a coastal structure of the rubble mound type with sloping fronts (Moutzouris and Daniil, 1995;Chitiroglou, 1996;Karakitsou, 1996). The dimensions of the¯ume were 27.40 m (length) Â 0.60 m (width) Â 1.53 m (depth).…”

Section: Laboratory Experimentsmentioning

confidence: 99%

“…The role of coastal structures in seawater oxygenation has only recently been considered (Hosoi et al, 1990(Hosoi et al, , 1995Moutzouris and Daniil, 1995). Wave-breaking in the vicinity of coastal structures and beaches results in higher oxygenation rates associated with an improvement of water quality in the surrounding area (Moutzouris and Daniil, 1994;Tsoukala and Moutzouris, 1995).…”

Section: Introductionmentioning

confidence: 99%

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The beneficial role of rubble mound coastal structures on seawater oxygenation

Daniil

Tsoukala

Moutzouris

2000

Annales Geophysicae

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The bene®cial role of rubble mound coastal structures on oxygenation under the eect of waves is discussed, based on analytical considerations and experimental data from laboratory experiments with permeable and impermeable structures. Signi®cant oxygenation of the wave-protected area was observed as a result of horizontal transport through the permeable structure. A two-cell model describing the transport of dissolved oxygen (DO) near a rubble mound breakwater structure was developed and used for the determination of the oxygen transfer coecients from the experimental data. Oxygen transfer through the airwater interface is considered a source term in the transport equation and the oxygen¯ux through the structure is taken into account. The mass transport equations for both sides of the structure are solved analytically in terms of time evolution of DO concentration. The behaviour of the solution is illustrated for three dierent characteristic cases of initial conditions. The oxygen transfer through the air±water interface in the wave-in¯uenced area increases the DO content in the area; the resulting oxygen¯ux through the structure is discussed. The analytical results depend on the initial conditions, the oxygen transfer coecient and the exchange¯ow rate through the structure. Experiments with impermeable structures show that air water oxygen transfer in the harbour area is negligible in the absence of waves. In addition the ratio of the horizontal DO¯ux to the vertical¯ux into the seaward side tends towards a constant value, independent of the initial conditions.

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Section: Laboratory Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The beneficial role of rubble mound coastal structures on seawater oxygenation

Daniil

Tsoukala

Moutzouris

2000

Annales Geophysicae

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show abstract

Section: Introductionmentioning

confidence: 99%

The beneficial role of rubble mound coastal structures on seawater oxygenation

2000

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Abstract. The bene®cial role of rubble mound coastal structures on oxygenation under the eect of waves is discussed, based on analytical considerations and experimental data from laboratory experiments with permeable and impermeable structures. Signi®cant oxygenation of the wave-protected area was observed as a result of horizontal transport through the permeable structure. A two-cell model describing the transport of dissolved oxygen (DO) near a rubble mound breakwater structure was developed and used for the determination of the oxygen transfer coecients from the experimental data. Oxygen transfer through the airwater interface is considered a source term in the transport equation and the oxygen¯ux through the structure is taken into account. The mass transport equations for both sides of the structure are solved analytically in terms of time evolution of DO concentration. The behaviour of the solution is illustrated for three dierent characteristic cases of initial conditions. The oxygen transfer through the air±water interface in the wave-in¯uenced area increases the DO content in the area; the resulting oxygen¯ux through the structure is discussed. The analytical results depend on the initial conditions, the oxygen transfer coecient and the exchange¯ow rate through the structure. Experiments with impermeable structures show that air water oxygen transfer in the harbour area is negligible in the absence of waves. In addition the ratio of the horizontal DO¯ux to the vertical¯ux into the seaward side tends towards a constant value, independent of the initial conditions.

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“…Studies on the contribution of bubbles on gas exchange across the air-water interface may be found in Eckenfelder Jr (1959), Kanwisher (1963), Hosoi and Murakami (1968), Kerman (1980), Merlivat and Memery (1983), Keeling (1993), Moutzouris and Daniil (1994), Chang and Liu (1999), and Bortkovskii (2002). The formation of bubbles caused by breaking wave may result in significant enhancement of gas transfer.…”

Section: Gas Bubblesmentioning

confidence: 99%

Reaeration and an oxygen transfer model for tropical reservoirs

Nguyen¹

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First and foremost, I would like to express my sincere appreciation and utmost gratitude to my supervisor, Associate Professor Tan Soon Keat, for his methodical guidance, encouragement, and continuous support. I am grateful to Prof. Tan for all the experiences gained and the opportunities that had enriched my research experience. His suggestions and recommendations have been most invaluable in this study. I would like to thank Assistant Professor Chua Hock Chye Lloyd and Dr. Adhityan Appan for their kind support and spending their valuable time listening, discussing, and making constructive comments on my research work. I am indebted to Dr. Wang Xikun for his support with the laboratory experiments. I was fortunate to have received generous support from staffs of the different laboratories: Mr. Daniel Lim; Mr. Anthony Foo; and Mr. Alwi Alkaff (Hydraulics Laboratory); and Mr. Phua Kok Soon (Construction Workshop). This work would not have been completed without the support from faculties and staffs of the School of Civil and Environmental Engineering. Special thanks are extended to Ms. Ng Soo Ching, Ms. Ng Beng Lay, Ms. Jamillah Bte Sa'adon, Ms.

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Water oxygenation in the vicinity of coastal structures due to wave breaking

Cited by 6 publications

References 10 publications

The beneficial role of rubble mound coastal structures on seawater oxygenation

The beneficial role of rubble mound coastal structures on seawater oxygenation

The beneficial role of rubble mound coastal structures on seawater oxygenation

Reaeration and an oxygen transfer model for tropical reservoirs

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