Nutrient sources for in-shore nuisance macroalgae: The Dublin Bay case

Jeffrey, David W.; Brennan, M.; Jennings, Eleanor; Madden, Benjamin J.; Wilson, James G.

doi:10.1080/00785326.1995.10431501

Cited by 28 publications

(15 citation statements)

References 15 publications

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“…In both study areas, the highest R 2 and lowest RMSE values were obtained when the depth range was restricted to being between 2 m and 6 m. These areas of the water column are considered to be more stable without bottom influence and the loss of correlation between reflectance and depths higher than 6 m. In both study areas, some negative values appeared close to the shoreline except for MB 3 which was registered in the lowest high tide. This could be explained by the influence of the bottom signal in areas shallower than 2 m. This issue would be especially important in Dublin Bay, where blooms of green algae in the intertidal area and subtidal blooms of the brown algae Ectocarpus siliculosus are registered (Jeffrey et al 1995). Algae and rocky bottoms present a darker signal compared to deep water areas having an influence on the performance of the model (Casal et al 2013;Vahtmäe and Kutser 2016).…”

Section: Assessment Of Bathymetric Modelsmentioning

confidence: 99%

Assessment of empirical algorithms for bathymetry extraction using Sentinel-2 data

Casal

Monteys

Hedley³

et al. 2018

International Journal of Remote Sensing

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Bathymetry estimated from optical satellite imagery has been increasingly implemented as an alternative to traditional bathymetric survey techniques. The availability of new sensors such as Sentinel-2 with improved spatial and temporal resolution, in comparison with previous optical sensors, offers innovative capabilities for bathymetry derivation. This study presents an assessment of the fit between satellite data and the underlying models in the most widely used empirical algorithms: the linear band model and the log-transformed band ratio model using Sentinel-2A data. Both models were tested in two study areas of the Irish coast with different morphological and environmental conditions. Results showed that the linear band model fitted better than the log-transformed band ratio model providing coefficient of determination values, R 2 , between 0.83 and 0.88 (0 m-10 m) for the five images considered in the study. The closest fit was found in the depth range 2 m-6 m. Atmospheric correction, bottom type influence, and water column conditions proved to be key factors in the bathymetric derivation using these satellite datasets.

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Section: Assessment Of Bathymetric Modelsmentioning

confidence: 99%

Assessment of empirical algorithms for bathymetry extraction using Sentinel-2 data

Casal

Monteys

Hedley³

et al. 2018

International Journal of Remote Sensing

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“…O'Dowley's particulate transport model (Brennan et al, 1994) suggested that the current movements round Dublin Bay created an area of deposition just outside the port entrance. This area coincided with an unusually dense bed of Lanice conchilega, a tubicolous polychaete with which the macroalgae Ectocarpus in particular is associated and the assemblage forms one of Jeffrey's (Jeffrey et al, 1995) remineralisation foci.…”

Section: Discussionmentioning

confidence: 99%

“…There has been considerable work done on nutrient inputs to the Bay, with many studies emphasising the role of particulate nutrients in the system and their contribution to algal growth though remineralisation (Jeffrey et al, 1995). These particulate nutrients, along with dissolved forms, are brought into the system by both sewage discharge and the rivers to mix in the Bay with inputs and outputs through tidal exchange.…”

Section: Introductionmentioning

confidence: 99%

Diffuse inputs of nutrients to Dublin Bay

Wilson¹

2005

Water Science and Technology

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The River Liffey is the main source of diffuse nutrients to Dublin Bay and accounts for some 85% of all riverine inputs. The total load from the various rivers has been calculated at some 6601 kg N d(1) and 748 kg P d(1), of which around 82% and 52% are in the form of DIN and phosphate respectively. Sewage discharge adds almost the same again to the load, with minor contributions from the sediments (which may simply be remineralising the particulates) and from nitrogen fixation. However, these inputs are very much less than those exchanged twice-daily by tidal action. These contributions are due to change very shortly with the advent of the new STW in Dublin, but the major change may be more in the speciation of the nutrients, and in particular the dissolved/particulate balance.

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“…In the higher energy system of the Baie de Somme particulate nutrients may be kept in suspension (as evidenced by the high SPM loadings) and the flushing itself may hinder attachment of macroalgae. This may explain to some extent the fact that eutrophication in Dublin Bay presents itself in the form of macroalgal mats, while in the Baie de Somme it presents as phytoplankton blooms (Jeffrey et al, 1995;Rybarczyck et al, 1996).…”

Section: Food Websmentioning

confidence: 96%