Assessing water renewal time scales for marine environments from three-dimensional modelling: A case study for Hervey Bay, Australia

Ribbe, Joachim; Wolff, Jörg‐Olaf; Staneva, Joanna; Gräwe, Ulf

doi:10.1016/j.envsoft.2008.02.007

Cited by 34 publications

(21 citation statements)

References 35 publications

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“…Flow patterns inside semienclosed domains with intrincate shorelines are usually complex (e.g. Cucco and Umgiesser 2006, Niedda and Greppi 2007, Ribbe et al 2008. Moreover, studies on harbour circulation highlight the 3D behaviour of the hydrodynamics inside the harbour and the interaction with winds, shelf currents and freshwater sources.…”

Section: Discussionmentioning

confidence: 99%

Water circulation forecasting in Spanish harbours

Grifoll¹,

Jordà²,

Sotillo³

et al. 2012

Sci. Mar.

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SUMMARY: This paper describes the first harbour circulation forecasting system implemented in Spain. The configuration design was based on previous analyses of the morphologic and hydrodynamic behaviour of three harbours: Barcelona, Tarragona and Bilbao. A nested system of oceanic models was implemented, with a scope ranging from the regional scale (with a mean horizontal resolution of 5 km) to the harbour scale (with a mean horizontal resolution of 40 m). A set of sensitivity tests was carried out in order to determine the optimal configurations. The results of the operational system were compared with available observations, revealing that the intermediate models are able to reproduce the averaged hydrodynamic behaviour but not the spatio-temporal variability. With the harbour models the quality of the forecasts improves, reaching a correlation and RMSE of ~0.6 and 6 cm s -1 , respectively, for Bilbao harbour. In addition, numerical experiments were carried out to evaluate the sensitivity of the forecasts to error sources. The results suggest that the errors in the information prescribed in the lateral boundary conditions are the most influential in the quality of the predictions. Errors in the wind field also have a smaller but non-negligible influence. Although the system is in the initial implementation phase and should be improved upon in the future, it is now a useful tool for harbour management. The predictions will be very helpful for harbour operations, pollution risk management and fighting oil spills.Keywords: operational oceanography, harbour hydrodynamics, Barcelona harbour, Bilbao harbour, Tarragona harbour. RESUMEN: Predicción de la circulación marina en los Puertos esPañoles. -En este artículo se describe el primer sistema operacional de predicción de la circulación en puertos implementado en España. El diseño del sistema se ha basado en un análisis previo de las características hidrodinámicas y morfológicas de tres puertos de estudio: Barcelona, Tarragona y Bilbao. Se ha establecido un sistema de modelos oceánicos anidados que cubre desde la escala regional (con una resolución media horizontal de 5 km) al dominio portuario (con una resolución de 40 m). Diferentes experimentos de sensibilidad se han llevado a cabo para determinar las configuraciones óptimas. Los resultados del sistema operacional se han comparado con las observaciones disponibles, mostrando que los modelos intermedios son capaces de resolver el comportamiento hidrodinámico promedio, pero no la variabilidad espacio-temporal. En cuanto a los modelos portuarios, la calidad de las predicciones mejora, alcanzando una correlación y un RMSE de ~0.6 y 6 cm s -1 , respectivamente, para el puerto de Bilbao. Adicionalmente se han realizado diferentes experimentos para determinar la sensibilidad del sistema a distintas fuentes de error. Los resultados sugieren que los errores en las condiciones de contorno laterales son los más determinantes sobre la calidad de las predicciones portuarias. Los errores en el viento, aun siendo menos importan...

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Section: Discussionmentioning

confidence: 99%

Water circulation forecasting in Spanish harbours

Grifoll¹,

Jordà²,

Sotillo³

et al. 2012

Sci. Mar.

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“…This gives an average T evap of 15 days. Ribbe et al (2008) computed typical water exchange time scales for Hervey Bay as 65 days. Therefore, the evaporation water loss dominates the salinity gradient rather than the movement of saline water due to residual circulations.…”

Section: Inverse State and Hypersalinitymentioning

confidence: 99%

Mixing, hypersalinity and gradients in Hervey Bay, Australia

2009

Self Cite

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Hervey Bay, a large coastal embayment situated off the central eastern coast 6 of Australia, is a shallow tidal area (average depth = 15 m), close to the continental 7 shelf. It shows features of an inverse estuary, due to the high evaporation rate (approx. 82 m/year), low precipitation (less than 1 m/year) and on average almost no freshwater 9 input from rivers that drain into the bay. 10The hydro-and thermodynamical structure of Hervey Bay and their variability are The investigation further shows that air temperature, wind direction and tidal regime 21 are mainly responsible for the stability of the inverse circulation and the strength of 22 the salinity gradient across the bay. 23Due to an ongoing drying trend, the occurrence of severe droughts at the central east 24 coast of Australia and therefore a reduction in freshwater supply, the salinity flux out 25 of the bay has increased and also the inverse circulation has strengthened. 26

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“…Shen and Wang [22] determining the age of water and long-term transport timescale of the Chesapeake Bay by conducting three dimensional modeling study. Ribbe et al [20] assessed water renewal time scales for marine environments from three-dimensional modeling in a case study for Hervey Bay, Australia. England [5] discussed water age and ventilation time scale in a global ocean model.…”

Section: Introductionmentioning

confidence: 99%

Estimating river flow effects on water ages by hydrodynamic modeling in Little Manatee River estuary, Florida, USA

et al. 2009

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The water age in a tidal river in Florida, Little Manatee River, has been investigated in this study by the application of a three-dimensional hydrodynamic model. In response to a pulse dye release in the upper end of the river boundary, the hydrodynamic model determines the water age for a given location by recording the time for the dye to reach the given river location. The hydrodynamic model uses horizontal curvilinear orthogonal grids to represent the complex river system that includes several bayous and tributaries. The model has was calibrated and verified in previous study by using two continuous data sets for a 6 month period. Satisfactory model verifications indicate that the hydrodynamic model is capable of quantifying the mixing and transport process for calculating the water age in the tidal river. For 17 freshwater inflow scenarios in the Little Manatee River, the hydrodynamic model was applied to simulate water ages along the main channel of the river at 2-km interval. Flow rates in the 17 scenarios varying from 0.26 to 76.56 m 3 /s cover the range of the observed flows in the Little Manatee River. Water ages from model predictions range from the minimum 1.2 days under the maximum 76.56 m 3 /s inflow condition to the 50 days under the minimum 0.26 m 3 /s inflow condition. Empirical regression equations at three selected stations, with the correlation coefficient R 2 above 0.96, were derived from numerical model simulations to correlate water ages to freshwater inflows. The empirical water-age equation derived from hydrodynamic model simulations can be used to provide quick and low-cost estimations of water ages in response to various inflow scenarios for studying physical-chemical and biological processes in the river.

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Assessing water renewal time scales for marine environments from three-dimensional modelling: A case study for Hervey Bay, Australia

Cited by 34 publications

References 35 publications

Water circulation forecasting in Spanish harbours

Water circulation forecasting in Spanish harbours

Mixing, hypersalinity and gradients in Hervey Bay, Australia

Estimating river flow effects on water ages by hydrodynamic modeling in Little Manatee River estuary, Florida, USA

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