Investigations on suspended matter transport processes in estuaries and coastal waters

1990 ◽  
pp. 165-171 ◽  
Author(s):  
Walter Puls ◽  
Manfred Lobmeyr ◽  
Agmar Müller ◽  
Matthias Schünemann ◽  
Herbert Kühl
Keyword(s):  
Suspended Matter ◽  
Coastal Waters ◽  
Transport Processes ◽  
Matter Transport

Investigations on Suspended Matter Transport Processes in Estuaries and Coastal Waters

1990 ◽  
pp. 165-171
Author(s):  
Walter Puls ◽  
Manfred Lobmeyr ◽  
Agmar Müller ◽  
Matthias Schünemann ◽  
Herbert Kühl
Keyword(s):  
Suspended Matter ◽  
Coastal Waters ◽  
Transport Processes ◽  
Matter Transport

Fate and transport modelling of faecal indicator bacteria in Dublin Bay

2020 ◽  
Author(s):  
Guanghai Gao ◽  
Aisling Corkery ◽  
John O’Sullivan ◽  
Wim Meijer ◽  
Gregory O’Hare ◽  
...  
Keyword(s):  
Water Quality ◽  
Decay Rate ◽  
Coastal Waters ◽  
Transport Processes ◽  
Indicator Bacteria ◽  
Climate Change Scenarios ◽  
Faecal Indicator Bacteria ◽  
Bathing Water ◽  
Intestinal Enterococci ◽  
The Eu

<p>Water-based microbial pathogens are often responsible for the spread of waterborne diseases in polluted coastal waters. However, difficulties in directly measuring pathogens have resulted in Faecal Indicator Bacteria (FIB) being commonly used as risk indicators in coastal and bathing water management. FIB groups, particularly those of E coli and enterococci, are easily quantified in laboratory tests and are used worldwide to assess health risks in bathing and shellfish harvesting waters.</p><p>Dublin Bay off the east coast of Ireland extends to over 300 km<sup>2</sup> and is home to species and habitats of high conservation importance. Its significant environmental, economic, cultural, recreational and tourism importance to the 300,000 people living within the Bay area and to the wider Dublin population is reflected in its 2015 Biosphere designation from the United Nations Educational, Scientific and Cultural Organisation (UNESCO). Recent years however, have seen an increase in pressures on the water quality in Dublin Bay with diffuse and point source pollution discharges from both the urban and rural catchments connected to the bay being a cause of increasing concern for the responsible authorities charged with managing the coastal waters in the context of national and European legislations, particularly the EU Bathing Water Directive (2006/7/EC).</p><p>Here we present the development of a 3-Dimensional numerical model for simulating the transport and fate of FIB (namely E.coli and Intestinal Enterococci) in the receiving waters of Dublin Bay. A dynamic decay rate, which included the effects of salinity, temperature and light intensity was adopted in the model, and was shown to offer advantages over the use of constant decay rate models for simulating the bacterial die-off. More importantly however, the analyses of sediment samples taken from the intertidal zone in the bay revealed relatively high faecal bacteria concentrations. The developed model in this study allows for the effects of sediment on bacteria transport processes in surface waters and in particular, the release of bacteria from sediments into the water column. The model was validated with measurements of current speed and direction at multiple points in Dublin Bay, and with faecal indicator bacteria concentrations (E.coli and Intestinal Enterococci) determined for neap and Spring tides in both wet and dry conditions. Results from model simulations agreed well with observed data. The model represents a high-level strategic tool that will be used to understand how water quality pressures in Dublin Bay may be altered under different climate change scenarios. The work presented forms part of the EU INTERREG funded Acclimatize project (www.acclimatize.eu/) that is investigating the longer-term water quality pressures in Dublin Bay that may arise in the context of a changing climate.</p>

A new method for the measurement of biogenic silica in suspended matter of coastal waters: using Si:Al ratios to correct for the mineral interference

2005 ◽  
Vol 25 (5-6) ◽  
pp. 697-710 ◽  
Author(s):  
Olivier Ragueneau ◽  
Nicolas Savoye ◽  
Yolanda Del Amo ◽  
Jo Cotten ◽  
Benoît Tardiveau ◽  
...  
Keyword(s):  
Suspended Matter ◽  
Coastal Waters ◽  
Biogenic Silica ◽  
New Method

Modelling Sedimentation and Resuspension in Lakes

1994 ◽  
Vol 29 (2-3) ◽  
pp. 309-342 ◽  
Author(s):  
V. Podsetchine ◽  
T. Huttula
Keyword(s):  
Suspended Matter ◽  
Transport Model ◽  
Sediment Resuspension ◽  
Heavy Rain ◽  
Weather Conditions ◽  
Eddy Diffusivity ◽  
Matter Transport ◽  
High Winds ◽  
D Model

Abstract A 2-D vertical flow and suspended matter transport model and a 3-D transport model are described. Existing parameterizations of resuspension and deposition of sediments on the bottom are discussed. Models were applied for calculation of unsteady sediment transport in Lake Karhijärvi, Finland, for a five-day period with high winds and heavy rain in autumn 1992. A parabolic distribution of vertical eddy diffusivity was found to be applicable. Erosion was approximated with cubic dependence on bed shear stress. The 3-D model showed that the observed turbidity peak in the middle of the lake was caused by suspended matter transport through the River Susikoski. Sediment resuspension was found to be limited in the areas with depth less than 1 m. The 2-D vertical model was useful for determination of erosion under certain weather conditions, but for detailed analysis in space and time a 3-D model with high resolution is required.

Impact of Sewage Disposal on the Distribution and Flux of Detergents in Alexandria Coastal Waters, Egypt

1992 ◽  
Vol 25 (9) ◽  
pp. 93-100 ◽  
Author(s):  
T. A. Aboul-Kassim
Keyword(s):  
Waste Water ◽  
Suspended Matter ◽  
Coastal Waters ◽  
Anionic Surfactants ◽  
Background Level ◽  
Total Suspended Matter ◽  
Daily Discharge ◽  
Water Disposal ◽  
Anionic Detergents ◽  
Year 2000

Detergents from 26 stations, representing four different zones from pollution view points, were sampled biweekly during 1985-1986 from the coastal waters of Alexandria, Egypt. Samples were analyzed for anionic surfactants, total suspended matter and salinity. The main objective of this work is to study retrospectively the relation between the state of pollution of Alexandria waters by anionic detergents and sewage and waste water disposal. A comparison with background level was performed to evaluate the deviations in anionic detergent concentrations. The absolute detergent values varied between a minimum of 0.02 mg LAS/l and a maximum of 12.55 mg LAS/l. The estimated detergent loadings reaching the study area are about 86, 109 & 7000 Kg/day through zones I, II & III, respectively. Based on the daily discharge of detergents to the waters of Alexandria, the population equivalent will vary from 0.40-0.73. The expected total loading of detergents to the area is projected to be approximately double between now and year 2000.

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