Modelling the two-dimensional flow between an estuary and lake connected by a bi-directional hydraulic structure

Zigic, Sasha; King, Brian; Lemckert, Charles James

doi:10.1016/j.ecss.2004.11.001

Cited by 12 publications

(12 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Evidence from natural estuaries shows that with increasing distance from open coastal waters, the contribution of marine fishes to the assemblage is minimal, instead it is dominated by a few, typically freshwater, fish species (West & , 1996;Wagner, 1999). A similar trend is evident in lakes and canal in the present study, and will probably become more pronounced because of the trend in south-east Queensland to connect new systems to the furthest reaches of existing networks (Zigic et al, 2005). Several water-quality variables have been shown to influence fish distributions in estuaries, with the most commonly reported being water temperature, salinity and dissolved oxygen (Blaber & Blaber, 1980;Loneragan et al, 1987;Marshall & Elliott, 1998;Whitfield, 1999;Martino & Able, 2003;Barletta et al, 2005).…”

Section: Fish Assemblages In Artificial Urban Waterwayssupporting

confidence: 71%

Section: Discussionmentioning

confidence: 72%

“…While the design change from canals to lakes has resolved the hydraulic concerns associated with extending these created waterways (Zigic et al , 2005), it would seem also to have resulted in a change in the fish assemblages populating these urban waterways. While many of the fish species present in canals were also found in lakes, some fish species were present in one habitat and not the other.…”

Section: Discussionmentioning

confidence: 99%

“…In Queensland, in recent years, it has been recognized that canal estates have caused hydraulic problems. The expansion of the Nerang River estuary, for example, has increased the tidal prism, causing erosion to downstream residential properties (Zigic et al , 2005). In order to circumvent similar hydraulic problems on other waterways in south‐east Queensland where waterfront developments are planned, property developers have been forced by legislation to build lake developments with a tidal barrier ( e.g.…”

Section: Introductionmentioning

confidence: 99%

“…locks, weirs, gates and pipes; Environmental Protection Agency, 2005). The design change to artificial lakes allows further property developments, while only marginally increasing the tidal prism of local waterways (Zigic et al , 2005). The quality of these lakes as fish habitat might be affected by restrictions on fish access due to tidal barriers or other hydrological differences such as the greater depth of lakes.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Artificial waterway design affects fish assemblages in urban estuaries

Waltham

Connolly

2007

Journal of Fish Biology

View full text Add to dashboard Cite

Fishes were collected from residential canal estates leading directly off natural estuaries and artificial lakes with control tidal exchange in south-east Queensland, Australia, to test the model that the difference in artificial waterway design affects fish assemblages. A total of 17 779 fish representing 52 species was caught, including 23 species of economic importance (45% of the catch). Total fish abundance and species richness differed little among sites within or between the two artificial habitats (canals and lakes) in either of the seasons sampled (winter and spring). Multivariate analysis showed, however, that assemblages differed among sites within the same artificial habitat. The differences were best explained by the distance sites were from open water, while salinity, water temperature and dissolved oxygen explained little of the variability. Most species were found in canals and lakes, but there were enough differences in composition between the habitats to detect a difference in both seasons (significant ANOSIM tests). Salinity was lower in lakes because of the tidal restrictions, and while this was only weakly correlated with differences in fish assemblages, it had the most explanatory power of any environmental variable. New recruits arrived later in lakes than canals, perhaps because of the barriers to tidal flow. A survey the following year showed that differences among individual lakes were consistent through time, offering insights into the influence of different tidal barriers on fish assemblages. The design change from canals to lakes has a minor influence on fish assemblages and alters the timing of recruitment.

show abstract

Section: Fish Assemblages In Artificial Urban Waterwayssupporting

confidence: 71%

Section: Discussionmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Artificial waterway design affects fish assemblages in urban estuaries

Waltham

Connolly

2007

Journal of Fish Biology

View full text Add to dashboard Cite

show abstract

Gold Coast Broadwater: Southern Moreton Bay, Southeast Queensland (Australia)

Dunn

Waltham

Benfer

et al. 2013

Estuaries of the World

View full text Add to dashboard Cite

Modelling the dispersion of treated wastewater in a shallow coastal wind-driven environment, Geographe Bay, Western Australia: implications for environmental management

Dunn¹,

Zigic²,

Shiell

2014

Environ Monit Assess

View full text Add to dashboard Cite

Numerical models are useful for predicting the transport and fate of contaminants in dynamic marine environments, and are increasingly a practical solution to environmental impact assessments. In this study, a three-dimensional hydrodynamic model and field data were used to validate a far-field dispersion model that, in turn, was used to determine the fate of treated wastewater (TWW) discharged to the ocean via a submarine ocean outfall under hypothetical TWW flows. The models were validated with respect to bottom and surface water current speed and direction, and in situ measurements of total nitrogen and faecal coliforms. Variations in surface and bottom currents were accurately predicted by the model as were nutrient and coliform concentrations. Results indicated that the ocean circulation was predominately wind driven, evidenced by relatively small oscillations in the current speeds along the time-scale of the tide, and that dilution mixing zones were orientated in a predominantly north-eastern direction from the outfall and parallel to the coastline. Outputs of the model were used to determine the 'footprint' of the TWW plume under a differing discharge scenario and, particularly, whether the resultant changes in TWW contaminants, total nitrogen and faecal coliforms would meet local environmental quality objectives (EQO) for ecosystem integrity, shellfish harvesting and primary recreation. Modelling provided a practical solution for predicting the dilution of contaminants under a hypothetical discharge scenario and a means for determining the aerial extent of exclusion zones, where the EQOs for shellfish harvesting and primary recreation may not always be met. Results of this study add to the understanding of regional discharge conditions and provide a practical case study for managing impacts to marine environments under a differing TWW discharge scenario, in comparison to an existing scenario.

show abstract

Modelling the two-dimensional flow between an estuary and lake connected by a bi-directional hydraulic structure

Cited by 12 publications

References 13 publications

Artificial waterway design affects fish assemblages in urban estuaries

Artificial waterway design affects fish assemblages in urban estuaries

Gold Coast Broadwater: Southern Moreton Bay, Southeast Queensland (Australia)

Modelling the dispersion of treated wastewater in a shallow coastal wind-driven environment, Geographe Bay, Western Australia: implications for environmental management

Contact Info

Product

Resources

About