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ebb tides

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Photographs showing standing waves during the late stage of ebb tides and wind-induced waves. A) Standing waves during ebb currents near the thalweg of the main channel (August 12, 2014). B) Wind-induced waves during ebb currents in the tributary channel on a stormy day (August 8, 2014). Waves propagated westward while ebb currents flow toward the southeast. C) Gridded pattern of waves on simple dunes in the main channel flank during ebb currents on a stormy day. Wave breakers on the simple dune crest are visible (August 5, 2015). D) Asymmetric simple dunes and symmetric wave ripples on the dune trough during the late stage of ebb tides. White bands of forms made by shoaling waves delineate falling water level marks on the lee sides of the simple dunes. Wave breakers in the tributary channel are seen in the distance (August 3, 2015).
Published: 01 October 2016
Fig. 10.— Photographs showing standing waves during the late stage of ebb tides and wind-induced waves. A) Standing waves during ebb currents near the thalweg of the main channel (August 12, 2014). B) Wind-induced waves during ebb currents in the tributary channel on a stormy day (August 8
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Poema Bridge. (a) View of the bridge at ebb tide. The bridge abutments are indicated by A and B. Note the asymmetrical gradients (g1 and g2) on both sides of the stream channel. (b-d) The Bouguer anomaly is shown by the gray dots (upper panels), and the measured topography below the bridge is displayed in dashed lines (lower panels). Estimated relief (solid line in the lower panels) and the corresponding fitted anomaly (solid line in the upper panels) produced by (b) the entropic regularization with γ0=0.00005 and γ1=0.0000219, (c) the global smoothness with μ=7, and (d) the weighted smoothness with μs=0.1, μr=0.0001, and a maximum assumed depth of 3.7m.
Published: 13 May 2010
Figure 5. Poema Bridge. (a) View of the bridge at ebb tide. The bridge abutments are indicated by A and B. Note the asymmetrical gradients ( g 1 and g 2 ) on both sides of the stream channel. (b-d) The Bouguer anomaly is shown by the gray dots (upper panels), and the measured
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Salinity and temperature measured between stations 1 and 2 on the ebb tide.
Published: 01 July 2000
F igure 1. Salinity and temperature measured between stations 1 and 2 on the ebb tide.
Journal Article
Journal: GSA Bulletin
Published: 01 March 1976
GSA Bulletin (1976) 87 (3): 419–426.
... across the mouth of the estuary by upstream progradation. Flood-tide currents move across this sill at velocities of as much as 90 cm/sec 15 cm above the bottom, but the velocity of ebb-tide currents usually does not exceed about 40 cm/sec. Dispersal patterns of dyed sediment injected at the river mouth...
Journal Article
Journal: GSA Bulletin
Published: 01 June 1983
GSA Bulletin (1983) 94 (6): 689–699.
... fine-grained sediment. Potential sources of sediment to this area include Pleistocene mud deposits on the continental shelf, fine sediment moving from north to south with the longshore drift, and Delaware Bay mud escaping the estuary on ebb tides. To determine the origin of the modern coastal muds...
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A) Map of Cobequid Bay in the Bay of Fundy, where compound dunes similar in scale to the Amphitheatre compound dunes are observed on large sand bars in the middle estuary. B) Close-up view of the compound dunes in Cobequid Bay. The location of the image is indicated by a black box in Figure 14A. The dominant flood- and ebb-tide master bedding accretion directions of the compound dune complex are indicated by large white arrows (oriented in a northeast-southwest trend). Subordinate dune accretion, shown by smaller white arrows, occurs in the troughs of the large-scale dunes, oriented approximately perpendicular to the trend of flood- and ebb-tide dune accretion. A similar trend oriented perpendicular to the dominant flood- and ebb-tide direction is apparent at the Amphitheatre outcrop. Satellite images are courtesy of Google Earth © 2017.
Published: 01 December 2018
in Figure 14A . The dominant flood- and ebb-tide master bedding accretion directions of the compound dune complex are indicated by large white arrows (oriented in a northeast-southwest trend). Subordinate dune accretion, shown by smaller white arrows, occurs in the troughs of the large-scale dunes, oriented
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Hydrodynamic patterns, Double Breasted Cays, an oolitic sand accumulation between two islands of Pleistocene bedrock. A) General setting. The blue and yellow lines are the locations of the current meter transects in parts B–E. B) Flow speeds across channels and bar during flood tide. Note that flow is focused in the southern channel. C) Flow vectors for flood tide, from same transect as in part C. D) Flow vectors during ebb tide, from same transect as in part E. E) Flow speeds across channels and bar during ebb tide. In this instance, flow is focused in the northern channel. F) Conceptual illustration of the dominant conduits for flood (blue) and ebb (yellow) tides. Modified from Reeder and Rankey (2008).
Published: 01 February 2011
. Note that flow is focused in the southern channel. C) Flow vectors for flood tide, from same transect as in part C. D) Flow vectors during ebb tide, from same transect as in part E. E) Flow speeds across channels and bar during ebb tide. In this instance, flow is focused in the northern channel
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Tidal flow velocities measured at the flood delta between Jack's Cay and Carter's Cay in the Abacos. The red line shows the transect followed during the ebb tide measurements while the blue line indicates the flood tide transect. Note the elevated velocities for the flood tide are found in the main channel (green triangle) while the ebb tidal dominance is found in the marginal channel (yellow triangle). Bottom observations were consistent with this net flow pattern, with flood-oriented sand waves in the main channel and ebb-oriented waves in the marginal channel. The elevated velocities in the ebb tide flow plot are below the depth line (white line in both plots) and therefore correspond most likely to hard-bottomed regions with reef growth where the acoustic signal experienced interference. Image copyright DigitalGlobe.
Published: 01 March 2008
Figure 7 Tidal flow velocities measured at the flood delta between Jack's Cay and Carter's Cay in the Abacos. The red line shows the transect followed during the ebb tide measurements while the blue line indicates the flood tide transect. Note the elevated velocities for the flood tide are found
Journal Article
Journal: AAPG Bulletin
Published: 01 March 1972
AAPG Bulletin (1972) 56 (3): 659.
...G. S. Visher; J. D. Howard Abstract Flood- and ebb-tide cycles produce differing bedforms, sedimentary structures, thicknesses of sedimentary units, and most important, grain-size distributions. Differences are the result of changes in bed shear, flow regime, and mechanisms of sediment transport...
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Glasnakille locality photograph montage. (a) The coastal nature of the outcrop. Medium- to coarse-grained sandstones are trough and planar cross-bedded. Palaeoflow is broadly towards the camera (towards the south). Person for scale in the bottom left is circled. (b) Large-scale trough cross-bedding from slightly higher in the succession. Dominance of trough cross-bedding indicates crescentic dune crests. Photograph taken looking SW on the road to the locality. (c) Thin-bedded cross-bed sets. Set thickness around 40 cm on average. Planar cross-bedding more common than trough cross-bedding here. Photograph taken looking west. (d) Evidence for bidirectional flow (current reversals) in this narrow tidal straight. Dominant current direction (ebb tide) is to the left and subordinate current direction (flood tide) is back to the right. Flood tide structures are parasitic and superimpose on the ebb tide master surfaces. Photograph taken looking SW. (e) Glasnakille cross-bedding dip direction rose diagram demonstrating axial palaeoflow to the SSW (ebb tide). A second (but less obvious) trend is clear, with NW-dipping surfaces believed to be the master surfaces of larger compound macro-dune structures plus an element of the subordinate, opposing cross-beds (flood tide). The data are not representative of the whole of the Bearreraig Sandstone Formation as only measurements on the coast were made. This locality is much closer to the base of the formation than it is to the top. (f) Glasnakille narrow tidal strait depositional model. CF, Camasunary Fault; SCF, Strathconnon Fault; Glasnakille locality is denoted Glas. Narrow half-graben led to strongly focused tidal currents. The Inner Hebridean seaway may have been around 20 km wide or so. Blue arrows show the dominant current direction (ebb tide).
Published: 29 April 2019
cross-bedding here. Photograph taken looking west. ( d ) Evidence for bidirectional flow (current reversals) in this narrow tidal straight. Dominant current direction (ebb tide) is to the left and subordinate current direction (flood tide) is back to the right. Flood tide structures are parasitic
Journal Article
Published: 01 August 2014
Journal of Sedimentary Research (2014) 84 (8): 694–717.
... progressing from shoreface parasequences in the south, to mixed-influence deltas, to south-prograding ebb-tide-dominated deltas, to flood-tidal bars in the far north. The tide-dominated delta and flood-tidal bars have broadly similar parasequences: Basal facies are bioturbated mudstone to muddy sandstone...
FIGURES
First thumbnail for: Lithofacies, Parasequence Stacking, and Deposition...
Second thumbnail for: Lithofacies, Parasequence Stacking, and Deposition...
Third thumbnail for: Lithofacies, Parasequence Stacking, and Deposition...
Journal Article
Journal: AAPG Bulletin
Published: 01 October 1965
AAPG Bulletin (1965) 49 (10): 1759–1760.
... the limit of surf encroachment and in the highest swash-mark area, a berm forms, which displays an onlap-ofilap series of laminae; also, portions of it are cross-laminated. This berm and its internal structure are a result of sedimentation during the flood- to ebb-tide period. © 1965 American Association...
Journal Article
Journal: Geology
Published: 25 September 2019
Geology (2019) 47 (11): 1083–1087.
... of stratigraphic units preserving pronounced tidal influence only when the seaway had a deep center (∼400 m) and southern entrance (>100 m). Maximum tidal velocity vectors under these conditions suggest a dominant southeasterly ebb tide within the Utah Bight, consistent with the location and orientation...
FIGURES
First thumbnail for: Regional-scale paleobathymetry controlled location...
Second thumbnail for: Regional-scale paleobathymetry controlled location...
Third thumbnail for: Regional-scale paleobathymetry controlled location...
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Schematic diagram showing how fluid mud likely impacted the wave, tide, and river processes and the resultant deposits during spring–neap tides and storm–interstorm periods. Note that purple lines indicate fluid-mud layers and mud flasers, and the lengths of the blue arrows are scaled to the tidal-current speeds. A) Spring (ST) and neap (NT) tidal processes and deposits during interstorm or fair-weather conditions. B, C) Storm waves (W) and deposits during spring and neap tides, respectively. Storm waves were damped by the fluid mud on the delta-front platform, so that river and tide deposits were preferentially preserved on the middle-inner delta-front platform. Note that SET and SFT indicate spring ebb-tide deposit and spring flood-tide deposit, and NET and NFT indicate neap ebb-tide deposit and neap flood-tide deposit. The inferred locations for segments A–D are marked on the delta clinoform. See detailed descriptions and interpretations in text.
Published: 16 January 2018
deposits were preferentially preserved on the middle-inner delta-front platform. Note that SET and SFT indicate spring ebb-tide deposit and spring flood-tide deposit, and NET and NFT indicate neap ebb-tide deposit and neap flood-tide deposit. The inferred locations for segments A–D are marked on the delta
Journal Article
Published: 01 February 1989
Journal of the Geological Society (1989) 146 (1): 97–111.
...G. E. WILLIAMS Abstract Sedimentary rhythmites of siltstone and fine sandstone from late Precambrian (c. 650–800 Ma) glaciogenic formations in South Australia are interpreted as distal ebb-tidal deposits that record variability in the velocity and range of palaeo-ebb tides. Variations in lamina...
Journal Article
Published: 01 December 1984
Journal of Sedimentary Research (1984) 54 (4): 1221–1238.
... rich parallel-laminated silt and sandy silt. This suite of sedimentary features and textures indicates changing current velocities and directions as bars emerge or are modified during ebb tide, and the vertical sequences could potentially be used to record intertidal bar erosion and aggradation...
Journal Article
Published: 01 June 1963
Journal of Sedimentary Research (1963) 33 (2): 279–290.
... flares like a horizontal jet, which ideally flares at 20 degrees . Whether single or branched, the issuing current is a tidal jet. Thus, at the ends of the inlet both the flood and ebb tides are drains on the high side and jets on the low side of the barrier, in both cases being there local maxima...
Journal Article
Journal: AAPG Bulletin
Published: 01 February 1963
AAPG Bulletin (1963) 47 (2): 366–367.
... flares like a horizontal jet, which ideally flares at 12°. Whether single or branched, the issuing current is a tidal jet . Thus, at the ends of the inlet, both the flood and ebb tides are drains on the high side and jets on the low side of the barrier, in both cases being there local maxima of hydraulic...
Journal Article
Published: 01 June 1967
Journal of Sedimentary Research (1967) 37 (2): 677–683.
... under the breaker zone. There is a slight diffusion of fine grains seaward of the step to the shoaling wave zone. Sediment moved landward with the advance of the breaker zone is concentrated at the step. Ebb tide sedimentation is similar, but two slight differences can be discerned. The fine sediment...
Journal Article
Journal: Clay Minerals
Published: 01 September 2006
Clay Minerals (2006) 41 (3): 727–738.
... in Cadiz Bay, where a portion of Atlantic suspended matter, driven by flood tide, comes into the inner bay and is deposited in the shallow waters of lagoons and salt marshes. Subsequently, because of the southeast wind and waves, these sediments are remobilized and transported to the west by the ebb tide...
FIGURES
First thumbnail for: Clay minerals as dynamic tracers of suspended matt...
Second thumbnail for: Clay minerals as dynamic tracers of suspended matt...
Third thumbnail for: Clay minerals as dynamic tracers of suspended matt...