The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
J. T. Gardner - One of the best experts on this subject based on the ideXlab platform.
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Wind‐forced Seiche events on Great Slave Lake: hydrologic implications for the Slave River Delta, NWT, Canada
Hydrological Processes, 2006Co-Authors: J. T. Gardner, M. C. English, Terry D. ProwseAbstract:A limited amount of research has focused on northern lacustrine deltas and the impacts of basin processes prevalent at these deltas. Wind-forced Seiche events have received little focus in deltaic studies. The Slave River Delta, located on the south shore of Great Slave Lake (GSL), NWT, is an ideal environment to study the prevalence of wind-forced Seiche events and the impact of Seiche events on the hydrodynamics of the delta. This paper presents an historical analysis of Seiche activity on GSL and the effect of Seiches on water levels of the Slave River Delta. The seasonality, frequency, and magnitude of Seiche events on the lake are quantified. A description of the wind characteristics that force these events is included. The radial distributary pattern of the delta suggests that water level response to Seiche events within the delta may be particularly complex. Hydrologic data from delta distributaries illustrate the temporal and spatial dynamics of Seiche response. During the open-water season, Seiche response in the delta is affected by the seasonal hydrograph of the Slave River and wind conditions. Spatially, the slope of delta distributaries governs Seiche response. Responses are most similar among zones in the delta rather than among different distributaries. Copyright © 2006 John Wiley & Sons, Ltd.
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wind forced Seiche events on great slave lake hydrologic implications for the slave river delta nwt canada
Hydrological Processes, 2006Co-Authors: J. T. Gardner, M. C. English, Terry D. ProwseAbstract:A limited amount of research has focused on northern lacustrine deltas and the impacts of basin processes prevalent at these deltas. Wind-forced Seiche events have received little focus in deltaic studies. The Slave River Delta, located on the south shore of Great Slave Lake (GSL), NWT, is an ideal environment to study the prevalence of wind-forced Seiche events and the impact of Seiche events on the hydrodynamics of the delta. This paper presents an historical analysis of Seiche activity on GSL and the effect of Seiches on water levels of the Slave River Delta. The seasonality, frequency, and magnitude of Seiche events on the lake are quantified. A description of the wind characteristics that force these events is included. The radial distributary pattern of the delta suggests that water level response to Seiche events within the delta may be particularly complex. Hydrologic data from delta distributaries illustrate the temporal and spatial dynamics of Seiche response. During the open-water season, Seiche response in the delta is affected by the seasonal hydrograph of the Slave River and wind conditions. Spatially, the slope of delta distributaries governs Seiche response. Responses are most similar among zones in the delta rather than among different distributaries. Copyright © 2006 John Wiley & Sons, Ltd.
Terry D. Prowse - One of the best experts on this subject based on the ideXlab platform.
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Wind‐forced Seiche events on Great Slave Lake: hydrologic implications for the Slave River Delta, NWT, Canada
Hydrological Processes, 2006Co-Authors: J. T. Gardner, M. C. English, Terry D. ProwseAbstract:A limited amount of research has focused on northern lacustrine deltas and the impacts of basin processes prevalent at these deltas. Wind-forced Seiche events have received little focus in deltaic studies. The Slave River Delta, located on the south shore of Great Slave Lake (GSL), NWT, is an ideal environment to study the prevalence of wind-forced Seiche events and the impact of Seiche events on the hydrodynamics of the delta. This paper presents an historical analysis of Seiche activity on GSL and the effect of Seiches on water levels of the Slave River Delta. The seasonality, frequency, and magnitude of Seiche events on the lake are quantified. A description of the wind characteristics that force these events is included. The radial distributary pattern of the delta suggests that water level response to Seiche events within the delta may be particularly complex. Hydrologic data from delta distributaries illustrate the temporal and spatial dynamics of Seiche response. During the open-water season, Seiche response in the delta is affected by the seasonal hydrograph of the Slave River and wind conditions. Spatially, the slope of delta distributaries governs Seiche response. Responses are most similar among zones in the delta rather than among different distributaries. Copyright © 2006 John Wiley & Sons, Ltd.
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wind forced Seiche events on great slave lake hydrologic implications for the slave river delta nwt canada
Hydrological Processes, 2006Co-Authors: J. T. Gardner, M. C. English, Terry D. ProwseAbstract:A limited amount of research has focused on northern lacustrine deltas and the impacts of basin processes prevalent at these deltas. Wind-forced Seiche events have received little focus in deltaic studies. The Slave River Delta, located on the south shore of Great Slave Lake (GSL), NWT, is an ideal environment to study the prevalence of wind-forced Seiche events and the impact of Seiche events on the hydrodynamics of the delta. This paper presents an historical analysis of Seiche activity on GSL and the effect of Seiches on water levels of the Slave River Delta. The seasonality, frequency, and magnitude of Seiche events on the lake are quantified. A description of the wind characteristics that force these events is included. The radial distributary pattern of the delta suggests that water level response to Seiche events within the delta may be particularly complex. Hydrologic data from delta distributaries illustrate the temporal and spatial dynamics of Seiche response. During the open-water season, Seiche response in the delta is affected by the seasonal hydrograph of the Slave River and wind conditions. Spatially, the slope of delta distributaries governs Seiche response. Responses are most similar among zones in the delta rather than among different distributaries. Copyright © 2006 John Wiley & Sons, Ltd.
Mauro Greppi - One of the best experts on this subject based on the ideXlab platform.
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Tidal, Seiche and Wind Dynamics in a Small Lagoon in the Mediterranean Sea
Estuarine Coastal and Shelf Science, 2007Co-Authors: Marcello Niedda, Mauro GreppiAbstract:Environmental monitoring and hydrodynamic studies were carried out to understand the forcing mechanisms that are responsible for the circulation patterns of the several small coastal lagoons of Sardinia, in the center of the Mediterranean Sea, Italy. The water level observed in the Calich lagoon showed a free-surface oscillation with a semidiurnal period (tide) and a second order oscillation with higher frequency and lower amplitude (Seiche). The wind has a local effect on these oscillations and generates a secondary circulation. Numerical analysis confirmed that the dynamics of the lagoon is mainly controlled by a balance between accelerations, barotropic pressure gradients, and bed and wind stresses, and highlighted that the surface Seiche is one of the mechanisms responsible for driving residual currents. The employed 2D-horizontal model of lagoon hydrodynamics, forced with tides only at the basin boundary, reproduced the natural mode oscillation period of 0.5 h of the basin. Besides, our study evaluated the accuracy of the simulation of the Seiche and wind effects. The plane 2D model, forced with the measured wind stress above the basin surface, simulated stronger Seiches by strength and variability in the wind field, in agreement with the measured Seiche and wind data. The 5-min time step of our monitoring was, however, too large to quantify accurately the relationship between Seiche-induced residual circulation and wind stress. Simulation results indicate that the wind variations at the time scale of minutes could affect the strength of the Seiche oscillation. Nevertheless, this variability had insignificant effect on the frequency, suggesting that the oscillatory response is predominantly linear. This analysis showed that tidal, atmospheric and Seiche forcing mechanisms are responsible for the circulation patterns of these small Mediterranean wetland areas, generating water level oscillations each one with specific frequency, but with amplitudes of the same order.
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Tidal, Seiche and wind dynamics in a small lagoon in the Mediterranean Sea
Estuarine Coastal and Shelf Science, 2007Co-Authors: Marcello Niedda, Mauro GreppiAbstract:Environmental monitoring and hydrodynamic studies were carried out to understand the forcing mechanisms that are responsible for the circulation patterns of the several small coastal lagoons of Sardinia, in the center of the Mediterranean sea, Italy. The water level observed in the Calich lagoon showed a free-surface oscillation with a semidiurnal period (tide) and a second order oscillation with higher frequency and lower amplitude (Seiche). The wind has a local effect on these oscillations and generates a secondary circulation. Numerical analysis confirmed that the dynamic of the lagoon is mainly controlled by a balance between accelerations, barotropic pressure gradients, and bed and wind stresses, and highlighted that the surface Seiche is one of the mechanisms responsible for driving residual currents. The employed 2D-horizontal model of lagoon hydrodynamics, forced with tides only at the basin boundary, reproduced the natural mode oscillation period of 0.5 h of the basin. Besides, stronger Seiches were simulated by strength and variability in the wind field, in close agreement with the measured strong Seiche and wind data. Our study evaluated the accuracy of the description of the Seiche and wind effects in the formulation of a plane 2D model. The 5 min time step of our monitoring was, however, too large to quantify accurately the relationship between residual Seiche-induced circulation and wind stress. Simulation results indicate that the wind variations at the time scale of minutes could affect the strength of the oscillation. Nevertheless, this variability had insignificant effect on the frequency, suggesting that the oscillatory response is predominantly linear. This analysis shows that tidal, atmospheric and Seiche forcing mechanisms are responsible for the circulation patterns of these small Mediterranean wetland areas, and generate water level oscillations with specific frequencies but with amplitudes of the same order
M. C. English - One of the best experts on this subject based on the ideXlab platform.
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Wind‐forced Seiche events on Great Slave Lake: hydrologic implications for the Slave River Delta, NWT, Canada
Hydrological Processes, 2006Co-Authors: J. T. Gardner, M. C. English, Terry D. ProwseAbstract:A limited amount of research has focused on northern lacustrine deltas and the impacts of basin processes prevalent at these deltas. Wind-forced Seiche events have received little focus in deltaic studies. The Slave River Delta, located on the south shore of Great Slave Lake (GSL), NWT, is an ideal environment to study the prevalence of wind-forced Seiche events and the impact of Seiche events on the hydrodynamics of the delta. This paper presents an historical analysis of Seiche activity on GSL and the effect of Seiches on water levels of the Slave River Delta. The seasonality, frequency, and magnitude of Seiche events on the lake are quantified. A description of the wind characteristics that force these events is included. The radial distributary pattern of the delta suggests that water level response to Seiche events within the delta may be particularly complex. Hydrologic data from delta distributaries illustrate the temporal and spatial dynamics of Seiche response. During the open-water season, Seiche response in the delta is affected by the seasonal hydrograph of the Slave River and wind conditions. Spatially, the slope of delta distributaries governs Seiche response. Responses are most similar among zones in the delta rather than among different distributaries. Copyright © 2006 John Wiley & Sons, Ltd.
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wind forced Seiche events on great slave lake hydrologic implications for the slave river delta nwt canada
Hydrological Processes, 2006Co-Authors: J. T. Gardner, M. C. English, Terry D. ProwseAbstract:A limited amount of research has focused on northern lacustrine deltas and the impacts of basin processes prevalent at these deltas. Wind-forced Seiche events have received little focus in deltaic studies. The Slave River Delta, located on the south shore of Great Slave Lake (GSL), NWT, is an ideal environment to study the prevalence of wind-forced Seiche events and the impact of Seiche events on the hydrodynamics of the delta. This paper presents an historical analysis of Seiche activity on GSL and the effect of Seiches on water levels of the Slave River Delta. The seasonality, frequency, and magnitude of Seiche events on the lake are quantified. A description of the wind characteristics that force these events is included. The radial distributary pattern of the delta suggests that water level response to Seiche events within the delta may be particularly complex. Hydrologic data from delta distributaries illustrate the temporal and spatial dynamics of Seiche response. During the open-water season, Seiche response in the delta is affected by the seasonal hydrograph of the Slave River and wind conditions. Spatially, the slope of delta distributaries governs Seiche response. Responses are most similar among zones in the delta rather than among different distributaries. Copyright © 2006 John Wiley & Sons, Ltd.
S. Geoffrey Schladow - One of the best experts on this subject based on the ideXlab platform.
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Observations and modeling of the surface Seiches of Lake Tahoe, USA
Aquatic Sciences, 2019Co-Authors: Derek C. Roberts, Alexander L. Forrest, Heather M. Sprague, Andrew T. Sornborger, S. Geoffrey SchladowAbstract:A rich array of spatially complex surface Seiche modes exists in lakes. While the amplitude of these oscillations is often small, knowledge of their spatio-temporal characteristics is valuable for understanding when they might be of localized hydrodynamic importance. The expression and impact of these basin-scale barotropic oscillations in Lake Tahoe are evaluated using a finite-element numerical model and a distributed network of ten high-frequency nearshore monitoring stations. Model-predicted nodal distributions and periodicities are confirmed using the presence/absence of spectral power in measured pressure signals, and using coherence/phasing analysis of pressure signals from stations on common and opposing antinodes. Surface Seiches in Lake Tahoe have complex nodal distributions despite the relative simplicity of the basin morphometry. Seiche amplitudes are magnified on shallow shelves, where they occasionally exceed 5 cm; elsewhere, amplitudes rarely exceed 1 cm. There is generally little coherence between surface seiching and littoral water quality. However, pressure–temperature coherence at shelf sites suggests potential Seiche-driven pumping. Main-basin Seiche signals are present in attached marinas, wetlands, and bays, implying reversing flows between the lake and these water bodies. On the shallow sill connecting Emerald Bay to Lake Tahoe, the fundamental main-basin Seiche combines with a zeroth-mode harbor Seiche to dominate the cross-sill flow signal, and to drive associated temperature fluctuations. Results highlight the importance of a thorough descriptive understanding of the resonant barotropic oscillations in any lake basin in a variety of research and management contexts, even when the magnitude of these oscillations tends to be small.
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Observations and modeling of the surface Seiches of Lake Tahoe, USA
Aquatic Sciences, 2019Co-Authors: Derek C. Roberts, Alexander L. Forrest, Heather M. Sprague, Andrew T. Sornborger, S. Geoffrey SchladowAbstract:Author(s): Roberts, DC; Sprague, HM; Forrest, AL; Sornborger, AT; Schladow, SG | Abstract: © 2019, Springer Nature Switzerland AG. A rich array of spatially complex surface Seiche modes exists in lakes. While the amplitude of these oscillations is often small, knowledge of their spatio-temporal characteristics is valuable for understanding when they might be of localized hydrodynamic importance. The expression and impact of these basin-scale barotropic oscillations in Lake Tahoe are evaluated using a finite-element numerical model and a distributed network of ten high-frequency nearshore monitoring stations. Model-predicted nodal distributions and periodicities are confirmed using the presence/absence of spectral power in measured pressure signals, and using coherence/phasing analysis of pressure signals from stations on common and opposing antinodes. Surface Seiches in Lake Tahoe have complex nodal distributions despite the relative simplicity of the basin morphometry. Seiche amplitudes are magnified on shallow shelves, where they occasionally exceed 5 cm; elsewhere, amplitudes rarely exceed 1 cm. There is generally little coherence between surface seiching and littoral water quality. However, pressure–temperature coherence at shelf sites suggests potential Seiche-driven pumping. Main-basin Seiche signals are present in attached marinas, wetlands, and bays, implying reversing flows between the lake and these water bodies. On the shallow sill connecting Emerald Bay to Lake Tahoe, the fundamental main-basin Seiche combines with a zeroth-mode harbor Seiche to dominate the cross-sill flow signal, and to drive associated temperature fluctuations. Results highlight the importance of a thorough descriptive understanding of the resonant barotropic oscillations in any lake basin in a variety of research and management contexts, even when the magnitude of these oscillations tends to be small.