Seasonal and Daily Variation of Hydrodynamic Conditions in the Amazon River Mouth: Influence of Discharge and Tide on Flow Velocity
Less, D.F.S.; Ward, N.D.; Richey, J.E., and Da Cunha, A.C., 2021. Seasonal and daily variation of hydrodynamic conditions in the Amazon River Mouth: Influence of discharge and tide on flow velocity. Journal of Coastal Research, 37(6), 1181–1192. Coconut Creek (Florida), ISSN 0749-0208. Hydrodynamics...
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| description | Less, D.F.S.; Ward, N.D.; Richey, J.E., and Da Cunha, A.C., 2021. Seasonal and daily variation of hydrodynamic conditions in the Amazon River Mouth: Influence of discharge and tide on flow velocity. Journal of Coastal Research, 37(6), 1181–1192. Coconut Creek (Florida), ISSN 0749-0208. Hydrodynamics characteristics control various biogeochemical processes related to the phenomena of transport of particulate materials, biogeochemical components, and greenhouse emissions; however, the hydrodynamic conditions in the North Channel of the Amazon River Mouth is relatively little understood. The seasonal and tidal variability of hydrodynamic characteristics in the North Channel of the Amazon River Mouth were investigated using an acoustic measurement technique. The measurements of discharge (Q), water velocity (U), and water level (h) were performed during a semidiurnal tidal cycle in a 12 km wide transect during four hydrological seasons. The hydrodynamics are mainly controlled by the river discharge, being directly related to the rain pattern with a well-defined time lapse for the Amazon Basin. The amplitude of the tides, the mean discharge, and the velocity of the natural flow presented during high discharge season were 3 m, 12,423 m3 s–1 and 1.18 m s–1, respectively. The analyses of tidal effects showed a phase opposition between the water level, river discharge, and water velocity; the water velocity was ∼42% higher during the ebb tide with a duration ∼1 hour and 30 minutes longer than the flood phase. The U and h are inversely proportional (R = –0.72, p < 0.01); significant variations in velocity throughout the tidal cycle are associated with the highest values observed at ebb tide, when the velocity and level of the water are significantly influenced by both diurnal and seasonal components. Thus, the results can contribute to the evaluations of more detailed potential interactions of the advective processes, such as mixing and dilution of passive agents of the natural flow, which are very poorly recorded in the existing literature. |
| doi_str_mv | 10.2112/JCOASTRES-D-21-00010.1 |
| format | Article |
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Seasonal and daily variation of hydrodynamic conditions in the Amazon River Mouth: Influence of discharge and tide on flow velocity. Journal of Coastal Research, 37(6), 1181–1192. Coconut Creek (Florida), ISSN 0749-0208. Hydrodynamics characteristics control various biogeochemical processes related to the phenomena of transport of particulate materials, biogeochemical components, and greenhouse emissions; however, the hydrodynamic conditions in the North Channel of the Amazon River Mouth is relatively little understood. The seasonal and tidal variability of hydrodynamic characteristics in the North Channel of the Amazon River Mouth were investigated using an acoustic measurement technique. The measurements of discharge (Q), water velocity (U), and water level (h) were performed during a semidiurnal tidal cycle in a 12 km wide transect during four hydrological seasons. The hydrodynamics are mainly controlled by the river discharge, being directly related to the rain pattern with a well-defined time lapse for the Amazon Basin. The amplitude of the tides, the mean discharge, and the velocity of the natural flow presented during high discharge season were 3 m, 12,423 m3 s–1 and 1.18 m s–1, respectively. The analyses of tidal effects showed a phase opposition between the water level, river discharge, and water velocity; the water velocity was ∼42% higher during the ebb tide with a duration ∼1 hour and 30 minutes longer than the flood phase. The U and h are inversely proportional (R = –0.72, p < 0.01); significant variations in velocity throughout the tidal cycle are associated with the highest values observed at ebb tide, when the velocity and level of the water are significantly influenced by both diurnal and seasonal components. Thus, the results can contribute to the evaluations of more detailed potential interactions of the advective processes, such as mixing and dilution of passive agents of the natural flow, which are very poorly recorded in the existing literature.</description><identifier>ISSN: 0749-0208</identifier><identifier>EISSN: 1551-5036</identifier><identifier>DOI: 10.2112/JCOASTRES-D-21-00010.1</identifier><language>eng</language><publisher>Fort Lauderdale: Coastal Education and Research Foundation</publisher><subject>Acoustic Doppler Current Profiler ; Acoustic measurement ; Biogeochemistry ; Carbon cycle ; Carbon dioxide ; Coastal inlets ; Coastal research ; Components ; Dilution ; Diurnal variations ; Ebb tides ; Estuaries ; Floods ; Flow velocity ; Fluid dynamics ; Fluid flow ; Fluid mechanics ; Greenhouse gases ; Hydrodynamics ; Hydrology ; Measurement techniques ; Natural flow ; River basins ; River discharge ; River flow ; River mouth ; River mouths ; river-tide interactions ; Rivers ; Seasons ; Sediments ; Sound measurement ; Stream flow ; Tidal analysis ; Tidal cycles ; Tidal effects ; Tidal waves ; Tides ; Transport phenomena ; Variation ; Velocity ; Water discharge ; Water levels ; Water velocity</subject><ispartof>Journal of coastal research, 2021-11, Vol.37 (6), p.1181-1192</ispartof><rights>Coastal Education and Research Foundation, Inc. 2021</rights><rights>Copyright Allen Press Inc. Aug 2021</rights><rights>Copyright Allen Press Inc. 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Seasonal and daily variation of hydrodynamic conditions in the Amazon River Mouth: Influence of discharge and tide on flow velocity. Journal of Coastal Research, 37(6), 1181–1192. Coconut Creek (Florida), ISSN 0749-0208. Hydrodynamics characteristics control various biogeochemical processes related to the phenomena of transport of particulate materials, biogeochemical components, and greenhouse emissions; however, the hydrodynamic conditions in the North Channel of the Amazon River Mouth is relatively little understood. The seasonal and tidal variability of hydrodynamic characteristics in the North Channel of the Amazon River Mouth were investigated using an acoustic measurement technique. The measurements of discharge (Q), water velocity (U), and water level (h) were performed during a semidiurnal tidal cycle in a 12 km wide transect during four hydrological seasons. The hydrodynamics are mainly controlled by the river discharge, being directly related to the rain pattern with a well-defined time lapse for the Amazon Basin. The amplitude of the tides, the mean discharge, and the velocity of the natural flow presented during high discharge season were 3 m, 12,423 m3 s–1 and 1.18 m s–1, respectively. The analyses of tidal effects showed a phase opposition between the water level, river discharge, and water velocity; the water velocity was ∼42% higher during the ebb tide with a duration ∼1 hour and 30 minutes longer than the flood phase. The U and h are inversely proportional (R = –0.72, p < 0.01); significant variations in velocity throughout the tidal cycle are associated with the highest values observed at ebb tide, when the velocity and level of the water are significantly influenced by both diurnal and seasonal components. Thus, the results can contribute to the evaluations of more detailed potential interactions of the advective processes, such as mixing and dilution of passive agents of the natural flow, which are very poorly recorded in the existing literature.</description><subject>Acoustic Doppler Current Profiler</subject><subject>Acoustic measurement</subject><subject>Biogeochemistry</subject><subject>Carbon cycle</subject><subject>Carbon dioxide</subject><subject>Coastal inlets</subject><subject>Coastal research</subject><subject>Components</subject><subject>Dilution</subject><subject>Diurnal variations</subject><subject>Ebb tides</subject><subject>Estuaries</subject><subject>Floods</subject><subject>Flow velocity</subject><subject>Fluid dynamics</subject><subject>Fluid flow</subject><subject>Fluid mechanics</subject><subject>Greenhouse gases</subject><subject>Hydrodynamics</subject><subject>Hydrology</subject><subject>Measurement techniques</subject><subject>Natural flow</subject><subject>River 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Diani F.S</au><au>Ward, Nicholas D</au><au>Richey, Jeffrey E</au><au>Da Cunha, Alan C</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Seasonal and Daily Variation of Hydrodynamic Conditions in the Amazon River Mouth: Influence of Discharge and Tide on Flow Velocity</atitle><jtitle>Journal of coastal research</jtitle><date>2021-11-01</date><risdate>2021</risdate><volume>37</volume><issue>6</issue><spage>1181</spage><epage>1192</epage><pages>1181-1192</pages><issn>0749-0208</issn><eissn>1551-5036</eissn><abstract>Less, D.F.S.; Ward, N.D.; Richey, J.E., and Da Cunha, A.C., 2021. Seasonal and daily variation of hydrodynamic conditions in the Amazon River Mouth: Influence of discharge and tide on flow velocity. Journal of Coastal Research, 37(6), 1181–1192. Coconut Creek (Florida), ISSN 0749-0208. Hydrodynamics characteristics control various biogeochemical processes related to the phenomena of transport of particulate materials, biogeochemical components, and greenhouse emissions; however, the hydrodynamic conditions in the North Channel of the Amazon River Mouth is relatively little understood. The seasonal and tidal variability of hydrodynamic characteristics in the North Channel of the Amazon River Mouth were investigated using an acoustic measurement technique. The measurements of discharge (Q), water velocity (U), and water level (h) were performed during a semidiurnal tidal cycle in a 12 km wide transect during four hydrological seasons. The hydrodynamics are mainly controlled by the river discharge, being directly related to the rain pattern with a well-defined time lapse for the Amazon Basin. The amplitude of the tides, the mean discharge, and the velocity of the natural flow presented during high discharge season were 3 m, 12,423 m3 s–1 and 1.18 m s–1, respectively. The analyses of tidal effects showed a phase opposition between the water level, river discharge, and water velocity; the water velocity was ∼42% higher during the ebb tide with a duration ∼1 hour and 30 minutes longer than the flood phase. The U and h are inversely proportional (R = –0.72, p < 0.01); significant variations in velocity throughout the tidal cycle are associated with the highest values observed at ebb tide, when the velocity and level of the water are significantly influenced by both diurnal and seasonal components. Thus, the results can contribute to the evaluations of more detailed potential interactions of the advective processes, such as mixing and dilution of passive agents of the natural flow, which are very poorly recorded in the existing literature.</abstract><cop>Fort Lauderdale</cop><pub>Coastal Education and Research Foundation</pub><doi>10.2112/JCOASTRES-D-21-00010.1</doi><tpages>12</tpages></addata></record> |
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| subjects | Acoustic Doppler Current Profiler Acoustic measurement Biogeochemistry Carbon cycle Carbon dioxide Coastal inlets Coastal research Components Dilution Diurnal variations Ebb tides Estuaries Floods Flow velocity Fluid dynamics Fluid flow Fluid mechanics Greenhouse gases Hydrodynamics Hydrology Measurement techniques Natural flow River basins River discharge River flow River mouth River mouths river-tide interactions Rivers Seasons Sediments Sound measurement Stream flow Tidal analysis Tidal cycles Tidal effects Tidal waves Tides Transport phenomena Variation Velocity Water discharge Water levels Water velocity |
| title | Seasonal and Daily Variation of Hydrodynamic Conditions in the Amazon River Mouth: Influence of Discharge and Tide on Flow Velocity |
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