Characterization of a glacial paleo-outburst flood using high-resolution 3-D seismic data: Bjørnelva River Valley, SW Barents Sea

Bellwald, Benjamin; Polteau, S.; Lebedeva‐Ivanova, Nina; Faleide, Jan Inge; Morris, S.M.; Morse, Sarita A.; Castelltort, Sébastien

doi:10.1017/jog.2020.115

Cited by 7 publications

(4 citation statements)

References 138 publications

(249 reference statements)

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“…Bridge & Lunt 2006) or catastrophic outburst floodwater channels (e.g. Bretz et al 1956;Bellwald et al 2021). We therefore tentatively interpret B1-4 as bar-shaped remnants of older sediments left within the two broad zones of erosion (LAZ 1 and LAZ 2).…”

Section: Seismic Stratigraphymentioning

confidence: 75%

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An integrated geological characterization of the Mid‐Pleistocene to Holocene geology of the Sørlige Nordsjø II offshore wind site, southern North Sea

Petrie,

Eide,

Haflidason

et al. 2024

Boreas

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Subsurface deposits in recently glaciated marine areas are highly heterogeneous, representing a range of glacial and postglacial environments and processes including glacitectonism, overconsolidation, fluvial and lacustrine deposition, and transgression. These heterogeneities are often linked to variations in engineering properties, with important implications for the design and installation of offshore wind infrastructure. In this study we present an integrated geological characterization of the Sørlige Nordsjø II offshore wind site, located in waters of 50–70 m depth along the southern border of the Norwegian North Sea, focusing on the evolution of the area's depositional setting during the late Quaternary period and its implications for offshore wind development. We integrate interpretations from a marine geological data set acquired in 2022 with legacy 3D seismic data and a review of the current understanding of the southern North Sea's complex glacial history. A preliminary ground model and accompanying risk map for the site is presented with five main geological units: (i) homogeneous and layered marine sands covering most of the site, with patchy distribution and coarser‐grained deposits in the east; (ii) buried, layered channel deposits containing organic material and possible associated shallow gas; (iii) buried, stiff glacilacustrine clay deposits; (iv) a buried, layered, glacitectonized unit incised by tunnel valleys, with a sandy marine infill; and (v) mounded tills and glacitectonized deposits containing boulders, exposed to shallowly buried in the east. Salt diapirism and gas migration were also found to be important potential geohazards at the site. Three‐dimensional seismic attribute maps were found to be a powerful aid to understanding the distribution and genesis of seismic facies identified on 2D high‐resolution sub‐bottom profiles. This type of data integration is an under‐utilized methodology for generating detailed preliminary ground models, which can inform more cost‐effective site survey and early foundation concept planning at geologically complex offshore wind sites.

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Section: Seismic Stratigraphymentioning

confidence: 75%

“…1956; Bellwald et al . 2021). We therefore tentatively interpret B1–4 as bar‐shaped remnants of older sediments left within the two broad zones of erosion (LAZ 1 and LAZ 2).…”

Section: Resultsmentioning

confidence: 99%

An integrated geological characterization of the Mid‐Pleistocene to Holocene geology of the Sørlige Nordsjø II offshore wind site, southern North Sea

Petrie,

Eide,

Haflidason

et al. 2024

Boreas

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“…6; (ii) to predict bar areasand hence help reconstruct formative channel-belt geometryfor sedimentary successions in which channel depth could be inferred by sedimentological analyses of outcrops, cores or well logs; Eq. 4; and to (iii) predict channel-fill thicknesses or depth of formative channels of subsurface successions in which bar areas can be mapped in planform (Ethridge & Schumm, 2007;Bellwald et al, Bar mode and riverbed gradient The bar mode is a morphological parameter for braided rivers, which is also applied to discriminate braided from single-thread river patterns (Parker, 1976;Crosato & Mosselman, 2009). The relationship presented in Eq.…”

Section: Applications To Modern Rivers and Ancient Successionsmentioning

confidence: 99%

“…; (ii) to predict bar areas – and hence help reconstruct formative channel‐belt geometry – for sedimentary successions in which channel depth could be inferred by sedimentological analyses of outcrops, cores or well logs; Eq. ; and to (iii) predict channel‐fill thicknesses or the depth of formative channels of subsurface successions in which bar areas can be mapped in planform (Ethridge & Schumm, 2007; Bellwald et al ., 2021).…”

Section: Summary: Applications and Limitationsmentioning

confidence: 99%

Controls on the morphology of braided rivers and braid bars: An empirical characterization of numerical models

Colombera

Yue

et al. 2022

Sedimentology

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Braided rivers exhibit highly variable morphologies, morphodynamic behaviours and resulting depositional records. To evaluate relationships between characteristics of braided-river channel belts and river depth, water discharge and streambed gradient, 39 numerical modelling experiments were conducted with the software Delft3D to simulate braided-river evolution under a broad range of boundary conditions. Data from model outputs were integrated with observations from 63 natural braided rivers differing with respect to river depth and streambed gradient. The modelled rivers each underwent similar evolutions, yet each culminated in markedly different final river morphologies, dependent on discharge and riverbed gradient. The rivers underwent evolutionary stages of: (i) formation of transverse unit bars with limited relief from an initially featureless bed; (ii) channel development around bars and in some cases dissecting transverse unit bars; (iii) formation of relatively simpler compound bars; and (iv) amalgamation of these simpler compound bars into more complex compound bars. Quantitative relationships relating to braided-river channel-belt morphology and organization are established, and the following results are noted: (i) bar elongation (length-to-width ratio) is correlated positively with riverbed gradient; (ii) bar height and area are correlated positively with discharge, and negatively with riverbed gradient; (iii) the river depth is the main predictor of mean braid-bar area; and (iv) the degree of braiding is primarily associated with river width-to-depth ratio and riverbed gradient. Results arising from this research improve our understanding of controls on the morphology and architectures of braided fluvial channel belts; they provide a novel empirical characterization that can be applied for predicting channel depth, bar morphology, streambed gradient, and degree of braiding of modern fluvial systems and of the formative rivers of ancient preserved successions.

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The Eurasian Arctic: glacial landforms prior to the Last Glacial Maximum (before 29 ka)

Winsborrow

Patton

Esteves

et al. 2022

European Glacial Landscapes

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Characterization of a glacial paleo-outburst flood using high-resolution 3-D seismic data: Bjørnelva River Valley, SW Barents Sea

Cited by 7 publications

References 138 publications

An integrated geological characterization of the Mid‐Pleistocene to Holocene geology of the Sørlige Nordsjø II offshore wind site, southern North Sea

An integrated geological characterization of the Mid‐Pleistocene to Holocene geology of the Sørlige Nordsjø II offshore wind site, southern North Sea

Controls on the morphology of braided rivers and braid bars: An empirical characterization of numerical models

The Eurasian Arctic: glacial landforms prior to the Last Glacial Maximum (before 29 ka)

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