Diffuse inputs of nutrients to Dublin Bay

Wilson, James G.

doi:10.2166/wst.2005.0596

Cited by 10 publications

(3 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(ii) Liffey River: Water quality measurements (Wilson, 2003) have shown that the Liffey catchment contribution of E.Coli (at average flow conditions) is less than 1% of the total load to the Bay. Furthermore, no storms or heavy rainfall events have preceded the week of the sampling day (the conditions of which are simulated herein) and thus it was reasonable to ignore the riverine input of E.Coli into the Bay for this comparison.…”

Section: Water Quality Modelmentioning

confidence: 99%

A Three-Dimensional Hydro-Environmental Model of Dublin Bay

Bedri

Bruen

Dowley

et al. 2011

Environ Model Assess

View full text Add to dashboard Cite

Publication informationEnvironmental Modeling and Assessment, 16 (4): 369-384Publisher Springer AbstractThis paper compares a 3-dimensional hydro-ecological model with a 2-dimensional model simulating the distribution and fate of Escherichia Coli (E.Coli) discharges from a sewage treatment plant discharging into Dublin Bay, Ireland. Before being discharged, the effluent from the sewage treatment plant is mixed with cooling water from a thermal generation plant resulting in a warm buoyant sewage plume that can be 7 − 9 o C higher than the ambient water in the Bay. The mixing of the stratified plume is complicated by the tidal currents which transport the plume into and out of the estuary. These processes have a direct impact on the transport and fate of E.Coli and the model comparison demonstrates that a three-dimensional model is required to adequately represent the mixing processes in such a stratified environment.The modelling followed a two-step procedure. First, hydrodynamic simulations of water levels and flow velocities in Dublin Bay were performed using the three-dimensional model TELEMAC-3D. The resulting water level and flow velocity fields were used by the three-dimensional water quality model, SUBIEF-3D to model the transport and fate of E.Coli in the Bay.Further simulations were performed in which the wind effects on the E.Coli dispersion were included. The water quality simulation was repeated using the 2-dimensional, depth-averaged, hydrodynamic model TELEMAC-2D to compare with the threedimensional simulations. The results showed that the three-dimensional model gives an adequate representation of the hydrodynamics and water quality in the Bay while the two-dimensional, depth-averaged, water quality model (in comparison to the threedimensional model) delays the timing of the delivery of E.Coli to the Bay and seriously underestimats the decay rate of E.Coli and the effect of wind on the movement of the buoyant plume of pollution.

show abstract

Section: Water Quality Modelmentioning

confidence: 99%

A Three-Dimensional Hydro-Environmental Model of Dublin Bay

Bedri

Bruen

Dowley

et al. 2011

Environ Model Assess

View full text Add to dashboard Cite

show abstract

“…2 a), with the SL directly connected to the Tolka estuary and Naniken Brook catchments., while the NL receives mixed marine waters passing into Sutton creek through the R. Liffey plume and the Santry River. Nutrient input into the BI lagoons has been a major problem in the past, with the main sources including input from rivers (Wilson 2005 ), raw sewage and industrial pollution (Jeffrey and Hayes 2005 ; Bedri et al 2006 ; Murphy et al 2016 ). BI is adjacent to Dublin Port (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Particulates from sewage and rivers have been identified as a major reason for both the productivity and the structuring of the food web in Dublin Bay, and are a major influence of the energy budget for the bay (Wilson et al 2007 ). Nutrient input into the Bull island lagoons has been a major problem in the past, with the main sources including input from rivers (Wilson 2005 ), raw sewage and industrial pollution (Wilson et al 2002 ; Jeffrey and Hayes 2005 ; O’Higgins and Wilson 2005 ; Murphy et al 2016 ).…”

Section: Introductionmentioning

confidence: 99%

Geochemical properties of blue carbon sediments through an elevation gradient: study of an anthropogenically impacted coastal lagoon

et al. 2023

View full text Add to dashboard Cite

Global research is showing that coastal blue carbon ecosystems are vulnerable to climate change driven threats including accelerated sea-level rise and prolonged periods of drought. Furthermore, direct anthropogenic impacts present immediate threats through deterioration of coastal water quality, land reclamation, long-term impact to sediment biogeochemical cycling. These threats will invariably alter the future efficacy of carbon (C) sequestration processes and it is imperative that currently existing blue carbon habitats be protected. Knowledge of underlying biogeochemical, physical and hydrological interactions occurring in functioning blue carbon habitats is essential for developing strategies to mitigate threats, and promote conditions to optimise C sequestration/storage. In this current work, we investigated how sediment geochemistry (0–10 cm depth) responds to elevation, an edaphic factor driven by long-term hydrological regimes consequently exerting control over particle sedimentation rates and vegetation succession. This study was performed in an anthropogenically impacted blue carbon habitat along a coastal ecotone encompassing an elevation gradient transect from intertidal sediments (un-vegetated and covered daily by tidal water), through vegetated salt marsh sediments (periodically covered by spring tides and flooding events), on Bull Island, Dublin Bay. We determined the quantity and distributions of bulk geochemical characteristics in sediments through the elevation gradient, including total organic carbon (TOC), total nitrogen (TN), total metals, silt, clay, and also, 16 individual polyaromatic hydrocarbon’s (PAH’s) as an indication of anthropogenic input. Elevation measurements for sample sites were determined on this gradient using a LiDAR scanner accompanied by an IGI inertial measurement unit (IMU) on board a light aircraft. Considering the gradient from the Tidal mud zone (T), through the low-mid marsh (M) to the most elevated upper marsh (H), there were significant differences between all zones for many measured environmental variables. The results of significance testing using Kruskal–Wallis analysis revealed, that %C, %N, PAH (µg/g), Mn (mg/kg), TOC:NH4+ and pH are significantly different between all zones on the elevation gradient. The highest values for all these variables exists (excluding pH which followed a reverse trend) in zone H, decreasing in zone M and lowest in the un-vegetated zone T. TC content is 16 fold higher overall in vegetated (3.43 -21.84%) than uninhabited (0.21–0.56%) sediments. TN was over 50 times higher (0.24–1.76%), more specifically increasing in % mass on approach to the upper salt marsh with distance from the tidal flats sediments zone T (0.002–0.05%). Clay and silt distributions were greatest in vegetated sediments, increasing in % content towards upper marsh zones The retention of water, metals, PAHs, mud, chloride ions, NH4+, PO43− and SO42− increased with elevated C concentrations, concurrently where pH significantly decreased. Sediments were categorized with respect to PAH contamination where all SM samples were placed in the high polluted category. The results highlight the ability of Blue C sediments to immobilise increasing levels of C, N, and metals, and PAH with over time and with both lateral and vertical expansion. This study provides a valuable data set for an anthropogenically impacted blue carbon habitat predicted to suffer from sea-level rise and exponential urban development. Graphical abstract Summarized results from this study demonstrating the geochemical changes through an elevation gradient, with a transect encompassing intertidal sediments through supratidal salt marsh sediments within Bull Island’s blue carbon lagoon zones.

show abstract

Thermal and Sewage Discharges

Wang

2024

Coastal Research Library

View full text Add to dashboard Cite

Diffuse inputs of nutrients to Dublin Bay

Cited by 10 publications

References 12 publications

A Three-Dimensional Hydro-Environmental Model of Dublin Bay

A Three-Dimensional Hydro-Environmental Model of Dublin Bay

Geochemical properties of blue carbon sediments through an elevation gradient: study of an anthropogenically impacted coastal lagoon

Thermal and Sewage Discharges

Contact Info

Product

Resources

About