Hydro-environmental modelling for bathing water compliance of an estuarine basin

Kashefipour, S. M.; Lin, BinLiang; Harris, Emmanuel; Falconer, Roger Alexander

doi:10.1016/s0043-1354(01)00396-7

Cited by 115 publications

(51 citation statements)

References 9 publications

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“…Hence, we chose to use the cross-sections based on a 1D model, named FASTER. This model addresses these challenges, with the model being developed specifically for the Ribble by Kashefipour et al (2002). Thus, this model has now been linked to the EFDC-2D model.…”

Section: Linkage Between Faster-1d and Efdc-2d/3d Modelsmentioning

confidence: 99%

“…In recent decades, there has been rapid development in the increasing sophistication of numerical models for FIO process simulations in catchments (Benham et al 2006, Stumpf et al 2010, Cho et al 2012, Tetzlaff et al 2012, Ghimire and Deng 2013, in river networks (Wilkinson et al 1995, Yang et al 2002 and in estuaries (Connolly et al 1999, Bai and Lung 2005, Gao et al 2011. Furthermore, some studies have been undertaken including both rivers and coastal waters (Kashefipour et al 2002, 2006, de Brauwere et al 2011, de Brauwere et al 2014. The linkage or coupling of different models to solve the hydrological, hydraulic and solute transport processes is necessary, together with including the different solution domains, spatial heterogeneity and the different spatial and temporal scales of the physical and chemical processes.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the range of different dimensional models can be utilized effectively by combining them as has been undertaken in recent research studies, with additional challenges being undertaken through domain decomposition and distribution, exchange and conservation of mass, momentum and energy flow across the linkages and consistency in the linked models' parameters across the model common interfaces. The main linking and coupling techniques include direct inputs from point sources without feedback from the hydrological to the hydrodynamic processes (Chen and Hong 2012, Zhang et al 2012, Huang et al 2013, Shrestha et al 2013, explicit linkage with time-step differences and modifications across common interfaces between river and estuary interfaces (Kashefipour et al 2002, 2006, Lai et al 2013, implicit or fully coupling by solving the unified equations for river and estuary interfaces, surface -subsurface interfaces (Gunduz and Aral 2005) and hydrodynamic-sediment particles coupling (Breuer et al 2012, Helmig et al 2013, Park et al 2013.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cloud to coast: integrated assessment of environmental exposure, health impacts and risk perceptions of faecal organisms in coastal waters

Huang

Falconer

Boye

et al. 2015

International Journal of River Basin Management

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The proper recognition and calculation of polluted sources and the fate and transport of faecal organisms in catchments, river networks and coastal waters are very important to the assessment of environmental exposure, health impacts and risk perceptions of faecal indicator organisms (FIO) in coastal waters. The paper reviews the integrated modelling techniques for faecal processes from cloud to coast, including sediment and faecal bacteria interactions, and then presents a theoretical and case study in the numerical modelling for FIO levels in the river Ribble and Fylde Coast using the twodimensional or three-dimensional environmental fluid dynamics code and the 1D Flow And Solute Transport in Estuaries and Rivers models, respectively. The related key parameters in the linked model are illustrated and analysed, together with validation of the hydrodynamic processes and the faecal bacteria concentration levels being undertaken using measured related data acquired in 1999. Using the model results, a quantitative microbial risk assessment is undertaken, where a moderate dose for swimming in faecal coliform-laden flows is accepted, as given by the European (EU) water quality standard requirements. The results show that some local regions of relatively high concentration exist near the outfalls and these values are not compliant with the mandatory and tighter microbial standards in the UK, as governed by the new EU Water Framework Directive. Finally, some new research and key challenges for the future are discussed in the paper.

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Section: Linkage Between Faster-1d and Efdc-2d/3d Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cloud to coast: integrated assessment of environmental exposure, health impacts and risk perceptions of faecal organisms in coastal waters

Huang

Falconer

Boye

et al. 2015

International Journal of River Basin Management

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“…where d C  depth averaged free-living bacteria concentration, Equation (26) has been solved to predict bacteria concentration levels for most studies of bacteria transport modelling, with this representation having been proven to represent the process accurately, such as Lin and Falconer [14], Kashefipour et al [15], for the case where sediment transport is not significant. However, for studies where sediment transport processes are significant, then solving these equations alone will not give accurate results since the transport of bacteria through the process Copyright © 2011 SciRes.…”

Section: Governing Equations For Bacteria Transport Processes Free-limentioning

confidence: 99%

Numerical Modelling Sediment-Bacteria Interaction Processes in the Severn Estuary

Gao¹,

Falconer²,

Lin³

2011

JWARP

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Faecal bacteria exist in both free-living and attached forms in estuarine waters. The deposition of sediments can take faecal bacteria out of the water column and to the bed. The sediments can subsequently be re-suspended to the water column, which can then lead to re-suspension of the faecal bacteria of the attached forms back to the water column. Therefore, the fate and transport of faecal bacteria is highly related to the governing sediment transport processes, particularly where these processes are significant, such as the Severn Estuary, UK. However, little attempt has been made to model such processes in terms of predicting the impact of the sediment fluxes on faecal bacteria levels. Details are given of the refinement of a numerical model of faecal bacteria transport, where the sediment transport processes are significant. After testing the sediment-bacteria interaction model favourably against known results in previous study, the model was applied to the Severn Estuary and Bristol Channel, UK, to investigate the impact of suspended sediment fluxes on the corresponding faecal bacteria transport processes. The model predictions have proved to be encouraging, with the results being compared to a traditional faecal bacteria modelling approach, where sediment bacteria interactions were not included. The new model provides improved predictions of faecal bacteria concentrations when sediment transport is included and for the Bristol Channel Severn Estuary it can be seen that the effects of the sediments on the bacterial levels in the water column can be significant.

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“…Depth-averaged hydro-environmental model have a wide range of applications (e.g. Kashefipour et al 2002Kashefipour et al , 2006Schnauder et al, 2007;Riou et al, 2007) due to their reasonable computational cost and the relative ease with which they can be set-up. However, in waters that exhibit considerable stratification in the vertical, as in Dublin Bay, a three-dimensional model is required and this study tests this hypothesis.…”

Section: Introductionmentioning

confidence: 99%

A Three-Dimensional Hydro-Environmental Model of Dublin Bay

Bedri

Bruen

Dowley

et al. 2011

Environ Model Assess

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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.

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Hydro-environmental modelling for bathing water compliance of an estuarine basin

Cited by 115 publications

References 9 publications

Cloud to coast: integrated assessment of environmental exposure, health impacts and risk perceptions of faecal organisms in coastal waters

Cloud to coast: integrated assessment of environmental exposure, health impacts and risk perceptions of faecal organisms in coastal waters

Numerical Modelling Sediment-Bacteria Interaction Processes in the Severn Estuary

A Three-Dimensional Hydro-Environmental Model of Dublin Bay

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