Modeling the Effect of Flow Structure Selection on Residence Time in an Artificial Canal System: Case Study

Benfer, Nathan Peter; King, Brian; Lemckert, Charles James; Zigic, Sasha

doi:10.1061/(asce)ww.1943-5460.0000029

Cited by 8 publications

(4 citation statements)

References 6 publications

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“…Finally, salinity and water temperatures were also recorded whenever possible at five sites ( Fig. 1 ) using CTD profilers (Greenspan CTD350) to provide contemporaneous data augmenting the previous, detailed information collected for hydraulic-modelling and flood-mitigation studies [78] , [79] , [80] .…”

Section: Methodsmentioning

confidence: 99%

Natural or Artificial? Habitat-Use by the Bull Shark, Carcharhinus leucas

et al. 2012

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BackgroundDespite accelerated global population declines due to targeted and illegal fishing pressure for many top-level shark species, the impacts of coastal habitat modification have been largely overlooked. We present the first direct comparison of the use of natural versus artificial habitats for the bull shark, Carcharhinus leucas, an IUCN ‘Near-threatened’ species - one of the few truly euryhaline sharks that utilises natural rivers and estuaries as nursery grounds before migrating offshore as adults. Understanding the value of alternate artificial coastal habitats to the lifecycle of the bull shark is crucial for determining the impact of coastal development on this threatened but potentially dangerous species.Methodology/FindingsWe used longline surveys and long-term passive acoustic tracking of neonate and juvenile bull sharks to determine the ontogenetic value of natural and artificial habitats to bull sharks associated with the Nerang River and adjoining canals on the Gold Coast, Australia. Long-term movements of tagged sharks suggested a preference for the natural river over artificial habitat (canals). Neonates and juveniles spent the majority of their time in the upper tidal reaches of the Nerang River and undertook excursions into adjoining canals. Larger bull sharks ranged further and frequented the canals closer to the river mouth.Conclusions/SignificanceOur work suggests with increased destruction of natural habitats, artificial coastal habitat may become increasingly important to large juvenile bull sharks with associated risk of attack on humans. In this system, neonate and juvenile bull sharks utilised the natural and artificial habitats, but the latter was not the preferred habitat of neonates. The upper reaches of tidal rivers, often under significant modification pressure, serve as nursery sites for neonates. Analogous studies are needed in similar systems elsewhere to assess the spatial and temporal generality of this research.

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Section: Methodsmentioning

confidence: 99%

Natural or Artificial? Habitat-Use by the Bull Shark, Carcharhinus leucas

et al. 2012

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“…Waterfront living demands and increasing population have resulted in the modification and extension of estuarine systems. Complex designs and the resulting decreased connectivity to the main waterway often increases residence times in canal estate waters (Benfer et al, 2010) but as yet there is limited information regarding the effects of residential canal systems on biogeochemical processes such as CO 2 evasion to the atmosphere. Some canal estate developments have grown by the connection of older canals systems to new estate developments.…”

Section: Introductionmentioning

confidence: 99%

Estuarine canal estate waters: Hotspots of CO2 outgassing driven by enhanced groundwater discharge?

2014

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“…Grifoll et al (2010) elucidated the spatial variability of water renewal, in a micro-tidal harbour. Benfer et al (2010) investigated water exchange and renewal behaviour for different flow structure designs in an artificial marina. Other studies of water renewal in "high-pressure anthropogenic areas" are found in Shen and Haas (2004), or Cucco et al (2009), who analyse the cleaning capacity of coastal basins oriented towards environmental management.…”

Section: Introductionmentioning

confidence: 99%