Testing long-term trends in turbidity in the Menai Strait, North Wales

Kratzer, Susanne; Buchan, Sinclair; Bowers, David

doi:10.1016/s0272-7714(02)00159-2

Cited by 16 publications

(14 citation statements)

References 11 publications

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“…(3) as the combination of the model derived by Bowers (2003) and the Eq. (2) derived by Kratzer et al (2003), regression analyses of the Secchi depths and the cube of wind speeds also gave similar results. In addition, for the Strait there was no best fit between the observed Secchi depths and the computed ones obtained by the computer model using the Eq.…”

Section: Discussionsupporting

confidence: 66%

“…For the Strait, computed Secchi depths obtained by the computer model using wind speeds of Gwynedd and the constants from Bowers (2003) and Kratzer et al (2003) had no best fits with observed Secchi depths despite they were consistent with each other.…”

Section: Resultsmentioning

confidence: 91%

“…In addition to this model, Kratzer et al (2003) found the linear relation between the concentration of suspended sediment c (mg/L) and the Secchi depth in meters(Z SD ) for the Menai Straitas c = -3.09 + (17.9/Z SD )…”

Section: Comparison Of Turbidity Trends and Relation Between Secchi Dmentioning

confidence: 99%

“…For instance, filter feeders coming from commercial mussel fisheries in the Strait did not have a major influence on turbidity and transportation of sediments and dumping of sewage sludge could also not be causes of the trends in the Strait due to the altered management practices by the Environmental Agency and the controls by the authorities (Birkett & Maggs, 2001). Finally, it was shown that the major factor of the turbidity trend in the Strait was not the anthropogenic input of organic material because the majority of the sediments were inorganic (Kratzer, Buchan, & Bowers, 2003). Thus, the suggestion of the fact that the turbidity changes in the Strait were driven by the changes in climate has become stronger (Buchan et al, 1967(Buchan et al, , 1973Thompson, 1974, Lumb, 1993Kratzer et al, 2003;Bowers, 2006) in addition to the consistent storm index over British Isles from 1960s to 1990s of Alexandersson, Tumenvirta, Schmith, and Iden (2000) with Secchi depths of the Strait (Bowers, 2006).…”

mentioning

confidence: 99%

“…Finally, it was shown that the major factor of the turbidity trend in the Strait was not the anthropogenic input of organic material because the majority of the sediments were inorganic (Kratzer, Buchan, & Bowers, 2003). Thus, the suggestion of the fact that the turbidity changes in the Strait were driven by the changes in climate has become stronger (Buchan et al, 1967(Buchan et al, , 1973Thompson, 1974, Lumb, 1993Kratzer et al, 2003;Bowers, 2006) in addition to the consistent storm index over British Isles from 1960s to 1990s of Alexandersson, Tumenvirta, Schmith, and Iden (2000) with Secchi depths of the Strait (Bowers, 2006). The aim of the present study is to determine whether the turbidity trend in the Menai Strait is a local or worldwide pattern and to test the hypothesis of the fact that the long term changes in Secchi depth are driven by long term changes in wind.…”

mentioning

confidence: 99%

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Comparison of Long Term Turbidity Trends in Different Locations

Tuncer¹

2017

JPR

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Light passage through water is affected by suspended materials in water. Secchi depths are simply used for the measurement of water clarity, in other words turbidity. The purpose of the present study was to determine whether the turbidity trend in the Menai Strait, Wales, UK is a local or worldwide pattern by comparing Secchi depths in the Strait with the ones from Skomer MNR, Wales, UK and from L'Estartit, Spain. Therefore, the hypothesis that long term changes in Secchi depth are driven by long term changes in wind speed was tested using correlation and regression analyses. For the Menai Strait, a computer model based on the mathematical relation between turbulent kinetic energy and Secchi depth was constructed. There were significantly negative correlation between monthly Secchi depth-wind speed pairs of Menai Strait-Anglesey and Skomer MNR-Cardiff but no correlation between annual pairs of Menai Strait-Anglesey and L'Estartit-Barcelona. As a result, it was proposed that high turbidity in the Menai Strait could not be explained by only wind speed, moderate turbidity in Skomer MNR could be driven by moderate wind and clear water of L'Estartit could not be explained by wind speed. It was concluded that wind alone could not cause turbidity without suspended particles in water but if there was a source of suspended particles, the wind would make the water more turbid.

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Section: Discussionsupporting

confidence: 66%

Section: Resultsmentioning

confidence: 91%

Section: Comparison Of Turbidity Trends and Relation Between Secchi Dmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Comparison of Long Term Turbidity Trends in Different Locations

Tuncer¹

2017

JPR

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Larval dispersal from an energetic tidal channel and implications for blue mussel (Mytilus edulis) shellfisheries

et al. 2022

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Complex coastal currents control early-stage larval dispersal from intertidal populations, and late-stage settlement patterns, but are often poorly resolved in larval dispersal models. Generally, there is high uncertainty in the timing of larval spawning, which markedly affects larval dispersal. In this study, we describe the physical parameters that induce spawning events in the blue mussel, Mytilus edulis, using a variation of the Condition Index (which relates the mass of meat to the mass of the shell) as a proxy. We developed a high-resolution Eulerian coastal hydrodynamic model, coupled with a Lagrangian particle tracking model, to quantify the potential dispersal of early-stage mussel larvae based on differing spawning dates obtained from field data. Our results showed that (1) the timings of larval spawning cannot be explained solely by ‘thermal shocks’ in the sea or air temperatures (i.e. fluctuations in temperature causing stress); (2) larger spawning events generally occurred during neap tides; (3) the simulated larval dispersal was largely but not always predicted by averaged current pathways (calculated over two weeks period); and (4) simulated self-recruitment was low at sites associated with strong tidal currents. These results have important implications for shellfisheries stock management and sustainability. Specific to this study, simulated mussels from shellfishery beds off North Wales dispersed more than 25 km in one week and so could feasibly contribute to the wider population throughout the northern part of the Irish Sea.

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