The morphology and palaeohydrology of a submerged glaciofluvial channel emerging from Waterford Harbour onto the nearshore continental shelf of the Celtic Sea

Gallagher, Colman

doi:10.1080/00750770209555800

Cited by 10 publications

(34 citation statements)

References 16 publications

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“…geological substrate would be a parsimonious explanation of the cyclicity in the LP it would ignore the fact that, if inheritance from TPN to LP has operated, most available signal from TPN is not evident in the LP (Table 2) closely to independent palaeodischarge estimates 1 -2 x 10 4 m 3 .s -1 for the submerged palaeochannel beyond Waterford Harbour (Gallagher, 2002;Gallagher et al, 2004). In conclusion, therefore, although there is some geologic-topographic This article is protected by copyright.…”

Section: Summary and Implications Of The Serial Statistics And Palaeomentioning

confidence: 98%

“…The response of RSL to glaciation in Ireland, including across its continental shelf (Scourse et al, 2009), was regionally and temporally complex due to GIA (Lambeck, 1993a(Lambeck, , 1993bBradley et al, 2009;Brooks et al, 2011). Consequently, the hydraulic geometries of terrestrial glaciofluvial channels that developed within existing river valleys have been affected by both the magnitude of glaciofluvial discharge and variation in RSL (Gallagher, 2002;Gallagher et al, 2004). Underwater video imaging showed that the Waterford Harbour palaeochannel terminates at a complex of arcuate boulder ridges Gallagher et al (2004).…”

Section: Study Reach and Palaeoenvironmental Contextmentioning

confidence: 99%

“…1). Gallagher (2002) presented geophysical evidence of the extension of this system onto the continental shelf beyond Waterford Harbour in the form of a large, submerged palaeochannel incised by discharges two orders of magnitude greater than present maximum discharges and adjusted to sea level at least 56 m lower than present (Fig. 1).…”

Section: Study Reach and Palaeoenvironmental Contextmentioning

confidence: 99%

“…glaciofluvial discharges from the Barrow and Nore valleys (Warren and Ashley, 1984;Gallagher, 2002;Gallagher et al, 2004;Hegarty, 2004). Together with bedrock pinch-points, the distribution of till and glaciofluvial deposits accounts for the overall slope, meander belt potential and both the morphological and geotechnical variability of the valley (e.g.…”

Section: Study Reach and Palaeoenvironmental Contextmentioning

confidence: 99%

“…Sub-bottom profiling and depth sounding of the lower Suir from the sea to Waterford Institute Research Vessel (RV) Celtic Voyager, using a GeoAcoustics GeoChirp operating at 1.5 -11.5 kHz (Gallagher, 2002;Gallagher et al, 2004). Multibeam bathymetry of Waterford Harbour (Fig.…”

Section: Long Profile Morphometric Surveymentioning

confidence: 99%

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Eskers in a complete, wet-based glacial system in the Phlegra Montes region, Mars

Gallagher

Balme

2015

Earth and Planetary Science Letters

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This paper investigates the influences of palaeohydrology and geologicaltopographic inheritance in shaping the channel of the lower River Suir, southeast Ireland. Results of acoustic surveys of the lower River Suir and Waterford Harbour reveal two scales of pseudo-cyclic river bedforms. Longitudinal elevation profiles of the geological topography (undulating bedrock and till-mantled bedrock) bounding the present floodplain swath reveal pseudo-cyclicity in that terrain too. Spectral and statistical analyses are used to quantify the cyclicity of the long profile and geological-topographic series. These methods show that the dominant cyclicity of the long profile reflects autocorrelation more than inheritance of cyclicity from the bounding geological topography. The cyclicity of the long profile mainly reflects a hydraulic control on pool-spacing, although some cyclicity probably has been inherited from the geological-topography. Channel-forming palaeodischarge is estimated based on the dominant pool-spacing revealed by spectral analysis, validated using relationships between meander wavelength, channel cross-sectional geometry and hydraulically-informed discharge reconstruction. The palaeodischarge estimates are in close agreement and are two orders of magnitude greater than present flood maxima. Significantly, these palaeodischarge estimates also agree closely with palaeodischarge calculated for the submerged Pleistocene palaeochannel that extends across the near-shore continental shelf from Waterford Harbour. The pool-sequence of the lower Suir and the submerged palaeochannel represent a former land-system that was active during a period of low relative sea level during the last glacial. More broadly, the paper offers insights into the landscape evolution of formerly glaciated regions that experienced very wide This article is protected by copyright. All rights reserved. discharge variability during and after the transition from glacial to interglacial regimes, in a context of complex relative sea level change.

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Section: Summary and Implications Of The Serial Statistics And Palaeomentioning

confidence: 98%

Section: Study Reach and Palaeoenvironmental Contextmentioning

confidence: 99%

Section: Study Reach and Palaeoenvironmental Contextmentioning

confidence: 99%

Section: Study Reach and Palaeoenvironmental Contextmentioning

confidence: 99%

Section: Long Profile Morphometric Surveymentioning

confidence: 99%

See 3 more Smart Citations

Eskers in a complete, wet-based glacial system in the Phlegra Montes region, Mars

Gallagher

Balme

2015

Earth and Planetary Science Letters

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Irish Sea and Atlantic Margin

Westley

Edwards

2017

Submerged Landscapes of the European Continental Shelf

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Discriminating between the roles of late Pleistocene palaeodischarge and geological‐topographic inheritance in fluvial longitudinal profile and channel development

Gallagher

Balme

Clifford

2017

Earth Surf Processes Landf

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This paper investigates the influences of palaeohydrology and geological‐topographic inheritance in shaping the channel of the lower River Suir, southeast Ireland. Results of acoustic surveys of the lower River Suir and Waterford Harbour reveal two scales of pseudo‐cyclic river bedforms. Longitudinal elevation profiles of the geological topography (undulating bedrock and till‐mantled bedrock) bounding the present floodplain swath reveal pseudo‐cyclicity in that terrain too. Spectral and statistical analyses are used to quantify the cyclicity of the long profile and geological‐topographic series. These methods show that the dominant cyclicity of the long profile reflects autocorrelation more than inheritance of cyclicity from the bounding geological topography. The cyclicity of the long profile mainly reflects a hydraulic control on pool‐spacing, although some cyclicity probably has been inherited from the geological‐topography. Channel‐forming palaeodischarge is estimated based on the dominant pool‐spacing revealed by spectral analysis, validated using relationships between meander wavelength, channel cross‐sectional geometry and hydraulically‐informed discharge reconstruction. The palaeodischarge estimates are in close agreement and are two orders of magnitude greater than present flood maxima. Significantly, these palaeodischarge estimates also agree closely with palaeodischarge calculated for the submerged Pleistocene palaeochannel that extends across the near‐shore continental shelf from Waterford Harbour. The pool‐sequence of the lower Suir and the submerged palaeochannel represent a former land‐system that was active during a period of low relative sea level during the last glacial. More broadly, the paper offers insights into the landscape evolution of formerly glaciated regions that experienced very wide discharge variability during and after the transition from glacial to interglacial regimes, in a context of complex relative sea level change. Copyright © 2017 John Wiley & Sons, Ltd.

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The morphology and palaeohydrology of a submerged glaciofluvial channel emerging from Waterford Harbour onto the nearshore continental shelf of the Celtic Sea

Cited by 10 publications

References 16 publications

Eskers in a complete, wet-based glacial system in the Phlegra Montes region, Mars

Eskers in a complete, wet-based glacial system in the Phlegra Montes region, Mars

Irish Sea and Atlantic Margin

Discriminating between the roles of late Pleistocene palaeodischarge and geological‐topographic inheritance in fluvial longitudinal profile and channel development

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