Seawater Infiltration into Tidal Flat or Sandy Beach Sediment by Wave Action in Enclosed Bay.

Cheong, Cheong Jo; Lee, Jeoung gyu; Nishijima, Wataru; Baba, Eiichi; Okada, Minoru

doi:10.2965/jswe.23.619

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…Volume of seawater infiltration by tide was estimated from the difference in water content of the sediments between high and low tides according to the method described by Cheong (2000).…”

Section: Tidal Flat Simulatormentioning

confidence: 99%

“…It is well known that tidal fluctuations play an important role in seawater infiltration during which dissolved matter in seawater is transported into benthic ecosystem in tidal flat as it returns to the sea by gravity drainage (McLachlan, 1982). Inter tidal flow of seawater supplies dissolved oxygen and consequently biological activities (Cheong, 2000). It is likely that the stranded oil prevents interstitial spaces of sediments, reduces water infiltration, and results in the decrease in oxygen, nutrients and other food supply to benthic communities.…”

Section: Introductionmentioning

confidence: 99%

“…It is likely that the stranded oil prevents interstitial spaces of sediments, reduces water infiltration, and results in the decrease in oxygen, nutrients and other food supply to benthic communities. It was reported that stranded oils significantly decreased infiltration of seawater into tidal flat sediment (Cheong, 2000). The purpose of this study is to evalluate the effects of stranded oil on tidal flat ecosystems with special emphasis on the relationship between seawater infiltration and macrobenthic community using tidal flat ecosystem simulators.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Spilled and Stranded Oils on Seawater Infiltration and Macrobenthic Community in Tidal Flats

Okada

Nishijima

2004

J. of Wat. & Envir. Tech.

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Effects of spilled oil stranded on tidal flats on macrobenthic community were studied using a tidal flat ecosystem simulator. Two simulators, C simulator as a control and O simulator with oil spill by fuel oil C (1 lm -2 ), were compared. Total population density of macrobenthos in the C simulator increased and was kept high throughout the experimental period. In the O simulator, however, the population density of macrobenthos was kept low from the oil spill treatment until day 35 and thereafter recovered significantly.ORP in both the C and O simulators showed positive values in the top 1 cm layer of sediments before the oil spill treatment. However ORP of the top 1cm of the sediment in the O simulator dropped down to negative values after the oil spill. The volume of seawater infiltration in the O simulator in day 23 decreased to a third by the spill. However, it recovered back to almost the same volume as that before the spill in day 58 when macrobenthic population density also recovered. Also, the concentrations of fuel oil C in top 1 cm of the sediments decreased gradually down to a half. The removal of fuel oil C in sediment by washout through tides and waves are possibly responsible for the recovery of seawater infiltration, consequently resulting in the restoration of macrobenthic community in the O simulator. These results suggest that spilled oil on tidal flats apparently reduces the infiltration volume of seawater and causes the development of reductive zone in sediment layer and such changes in physical environment are mainly responsible for the damages in the macrobenthic community in tidal flats.

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“…Volume of seawater infiltration by tide was estimated from the difference in water content of the sediments between high and low tides according to the method described by Cheong (2000).…”

Section: Tidal Flat Simulatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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