The Role of a Man-made Headland in Generating Patches in Coastal Waters of Ise Bay, Japan

Furukawa, Katsuko

doi:10.1006/ecss.1999.0529

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…Compared to artificial reefs employed in Europe, the US and Japan, covering more than 20 hectares (Santos & Monteiro, 1997; Furukawa, 2000; Relini et al , 2002b; Reed et al , 2006), the reef complex studied here can be considered to be small and essentially experimental. Along with the size, the environment of the region is characterized by strong hydrodynamic processes, such that the potential changes in the sediment, such as increase in organic matter content and subsequent enrichment of nutrients due in large degree to rapid colonization by fish and the epifauna, are rapidly diluted.…”

Section: Discussionmentioning

confidence: 96%

Artificial reef influence on the surrounding infauna—north coast of Rio de Janeiro State, Brazil

2011

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There have been many efforts to appraise the extent to which artificial reefs affect the surrounding community, but few studies addressed whether benthic assemblages change with distance from the reef. We experimentally assessed the relationship between infauna abundance and richness with increased distance (0, 5, 25, 50, 100 and 300 m) from reefballs deployed on a flat and homogeneous bottom, 9-m deep, on the north coast of Rio de Janeiro, south-eastern Brazil. Benthic taxon richness and abundance varied significantly between surveys with higher values in February 2007. Both numerical indicators changed similarly with distance, but more noticeably between 300 m and the other distance treatments where abundance was highest. A non-metric multidimensional scaling ordination revealed that macrobenthic assemblages were very heterogeneous with significant differences between surveys but not among sampling distances. A canonical correspondence analysis including species, distances and sediment variables showed that the distances 5, 25 and 100 m were related to organic matter and mud (fine sediment), while 0 and 300 m distances were more related to the non-organic variables, such as the percentage of gravel, sand and calcium carbonate. Spatial variations in the parameters of the sediment alone did not explain the distribution of the associated infauna, given the similarity of the community at different distances. It is suggested that the influence of artificial reefs is quickly dissipated due to strong bottom sea currents, indicating a reduced impact or influence of these reefs on the surrounding infauna.

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Section: Discussionmentioning

confidence: 96%

Artificial reef influence on the surrounding infauna—north coast of Rio de Janeiro State, Brazil

2011

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“…Flow near the ocean margin is strongly affected by the combination of coastal currents, stratification, and complex coastline or bathymetric shape. Flow past headlands and islands has been known to be a source of persistent horizontal eddies [ Wolanski et al , 1984; Black and Gay , 1987; Geyer and Signell , 1990; Signell and Geyer , 1991; Geyer , 1993; Furukawa , 2000]. The time average of these eddies in tidally driven cases appears as a “tidal residual.” These residual flows are addressed by Robinson [1983], Signell and Geyer [1990, 1991], and Ridderinkhof and Zimmerman [1990].…”

Section: Introductionmentioning

confidence: 99%

Oscillatory flow across an irregular boundary

Pawlak

MacCready

2002

J.‐Geophys.‐Res.

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[1] Laboratory experiments examining oscillatory flow along a coastline or isobath with a series of headlands or ridges reveal a mechanism for transfer of momentum and mass from the boundary into the interior flow through the establishment of organized residual flow patterns. Particle imaging velocimetry is used to visualize the vorticity field and to quantify large-scale residual circulations generated near the region of roughness. Two flow regimes are observed for differing ratios of alongcoast tidal excursion, L, to the length of the roughness region, D. For L/D > 1 a weak inflow is produced in the vicinity of the roughness region, with a corresponding alongshore flow away from the region. For L/D < 1 a strong outflow jet is established near the center of the roughness region. The two flow regimes result from different residual vorticity patterns and rely on eddies being longlived relative to the tidal period. Thus these results are relevant to flows in which dissipation is weak relative to the mean flow kinetic energy such as for tidal flow in deep water. Flow past a single roughness element is used as an analog to tidal flow past a headland and is represented by the high L/D limit.

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“…Several studies have been carried out in Ise Bay in recent years (e.g., Furukawa, 1999;Sugimoto et al, 2005;Ohta et al, 2007;Shota et al, 2009). However, few geochemical analyses have been made to determine the geographical distribution of trace metals, and the factors that control their distribution.…”

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confidence: 99%

Evaluation of Trace Metal Contamination in Ise Bay, Mie Prefecture, Central Japan, Based on Geochemical Analysis of Tidal Flat Sediments

Diallo

Ishiga²

2016

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Geochemical analysis of tidal flat sediments was conducted to evaluate the environment of Ise Bay, Mie, central Japan. The sediment samples were analyzed using XRF to determine the geochemical compositions of sediments in the Ise and Matsusaka estuaries and their foreshores. Enrichment Factor (EF) and the Anthropogenic Contribution (AC) parameters were used to examine the potential effect of human activity. Furthermore, the Coastal Ocean Sediment Database, lowest and severe effect levels and Canadian Sediment Quality Guidelines were applied as benchmarks to assess the sediment quality. The results show that the highest average concentrations of metals occur in the Ise estuary, mainly due to the presence of higher proportions of silt and clay in samples at that site. The EFs of Pb in the Matsusaka foreshore, and that of As in the Ise foreshore reflect minimal pollution. The average AC ranged from 1 to 30%, implying that the lithology is the primary control of any enrichment in trace metals within the bay. The sediment quality guidelines indicate that the metal levels in the study areas do not constitute a major threat to biota.

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The Role of a Man-made Headland in Generating Patches in Coastal Waters of Ise Bay, Japan

Cited by 6 publications

References 8 publications

Artificial reef influence on the surrounding infauna—north coast of Rio de Janeiro State, Brazil

Artificial reef influence on the surrounding infauna—north coast of Rio de Janeiro State, Brazil

Oscillatory flow across an irregular boundary

Evaluation of Trace Metal Contamination in Ise Bay, Mie Prefecture, Central Japan, Based on Geochemical Analysis of Tidal Flat Sediments

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