Continental slope-confined canyons in the Pearl River Mouth Basin in the South China Sea dominated by erosion, 2004–2018

Yin, Shaoru; Lin, Lin; Pope, Ed; Li, Jiabiao; Ding, Weifeng; Wu, Ziyin; Ding, Weiwei; Gao, Jinyao; Zhao, Dineng

doi:10.1016/j.geomorph.2019.07.016

Cited by 23 publications

(20 citation statements)

References 97 publications

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“…Pioneering works, based on fixed morphology through seismic J o u r n a l P r e -p r o o f profiles (Hay, 1987) and sediment cores (Nesteroff and Heezen, 1962), allow the good understanding of different canyon types and their functioning. Over the last 20 years, current meter and sediment trap moorings (Xu et al, 2002;Khripounoff et al, 2003;Paull et al, 2002;Lintern et al, 2016;Zhang et al, 2018), repeated bathymetric surveys (Smith et al, 2005(Smith et al, , 2007Xu et al, 2008;;Hughes Clarke et al, 2014;Lintern et al, 2016;Hage et al, 2018;Yin et al, 2019) and direct observation by ROV (Gillet et al, 2019;Paull et al, 2005;Paull et al, 2010) have contributed to filling the gap between observed morpho-sedimentary features and hydro-sedimentary processes. The monitoring of currents and of seabed morphology of both active canyons that are significantly supplied by sediment during the present high-stand (e.g.…”

Section: Introductionmentioning

confidence: 99%

Upstream migrating knickpoints and related sedimentary processes in a submarine canyon from a rare 20-year morphobathymetric time-lapse (Capbreton submarine canyon, Bay of Biscay, France)

et al. 2020

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The Capbreton submarine canyon is a striking feature of the southeast of the Bay of Biscay. This canyon forms a deep incision through the continental shelf and slope, and displays remarkable structures linked to its present-day hydrosedimentary activity. Its head has been disconnected from the Adour River since 1310 CE, but remains close enough to the coast to be supplied with sediment by longshore drift. Gravity processes in the canyon body are abundantly described and documented, but activity in the head and the fan of the canyon is poorly constrained. Furthermore, many questions remain regarding the details of processes affecting the head, the body and the fan of the Capbreton canyon. In this work, we address the paucity of documentation concerning (1) the temporal evolution of sediment transfer between the head and the deep reaches of the canyon, and (2) the interaction between gravity processes and the morphology of the canyon floor, including both shaping and feedback mechanisms. Highlights ► Rare time series allows the morphologic follow-up of an active canyon ► 20-years comparison underlines alternating filling and erosive periods ► Erosion processes are highlighted by fast upstreammigrating knickpoints

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Section: Introductionmentioning

confidence: 99%

Upstream migrating knickpoints and related sedimentary processes in a submarine canyon from a rare 20-year morphobathymetric time-lapse (Capbreton submarine canyon, Bay of Biscay, France)

et al. 2020

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“…There is also a clear asymmetry in the sub-linear, slope-confined canyons of the Pearl River Mouth Basin, as shown by their steep eastern walls and stepped, curved western walls sculpted by slumps and slides (Ding et al, 2013;He et al, 2014). Yin et al (2019) link the asymmetry of these submarine canyons to contour currents, as well as to turbidity currents.…”

Section: Introductionmentioning

confidence: 88%

The role of sediment gravity flows on the morphological development of a large submarine canyon (Taiwan Canyon), north‐east South China Sea

Alves

et al. 2021

Sedimentology

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High-resolution multibeam bathymetric and multichannel seismic data are used to investigate the morphology of a submarine canyon (Taiwan Canyon), and its surrounding strata, in the northeast South China Sea. This submarine canyon shows two main branches at its head, and changes its orientation from north-west/south-east to east-west due to the effect of a tectonically active seamount. The asymmetry of the submarine canyon's banks in its middle reach is due to the combined action of recurrent slope instability and turbidity currents. In addition, two fields of sediment waves were identified in the study area. Field 1 is located on the southwest levée of the canyon and is fed by turbidity currents from one of its branches, being also associated with marked hydraulic jumps. Field 2 is observed in the southern bank of the lower canyon reach and was formed by the overspill of turbidity currents within the Taiwan Canyon due to the effect of inertial centrifugal forces. Turbidity currents sourced from Dongsha Channel also contributed to forming Field 2. Importantly, trains of plunge pools have been identified along the thalweg of the lower canyon reach, generated by turbidity currents deriving from the submarine canyons in the north of the Taiwan Canyon. These results not only provide a very detailed account of submarine bedforms within and around a large submarine canyon, but also contribute to a better understanding of their origin and development. The high-resolution bathymetric and seismic data in this work reveal how gravity flows can drive erosion and deposition in submarine canyons.

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“…Smith et al, 2018), slope currents (e.g. Wang et al, 2018), high-energetic waves (e.g., solitary waves, Yin et al, 2019;storm waves, Sequeiros et al, 2019), and dense shelfwater cascading (e.g. Canals et al, 2006;Puig et al, 2014 and references therein;Gales et al, 2021).…”

Section: Hydrodynamic Processesmentioning

confidence: 99%

“…Slope-confined canyons can be fed by sands overpassing the shelf edge if their heads are in the range of the run-out distance of turbidity currents linked to fluvial discharge or littoral cells (e.g. Cronin et al, 2005;Yin et al, 2019). Canyons in high-latitude settings affected by glaciation can receive sediment delivered by the progradation of ice sheets onto shelf margins and from floating ice carrying debris (e.g.…”

Section: Interpretationsmentioning

confidence: 99%

A global analysis of controls on submarine-canyon geomorphology

Bührig¹,

Colombera²,

Patacci³

et al. 2023

Preprint

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The role of possible controlling factors in influencing the geomorphology of submarine canyons has been investigated using a database of 282 globally distributed modern examples collated from the literature, open-source worldwide bathymetry and satellite imagery. Canyon geomorphology has been characterized quantitatively in terms of maximum and average canyon dimensions, canyon sinuosity, the average canyon thalweg gradient, and maximum canyon sidewall steepness. Geomorphological variations with respect to position of the canyon apex relative to the shelf break, continental-margin type, terrestrial source-to-sink system setting, oceanographic environment, and climate zones have been assessed. Scaling relationships between canyon morphometric parameters, and between them and attributes of their physiographic setting, their terrestrial catchments, and attributes of continental shelves and slopes have been quantified.Key findings are as follows: (i) a number of scaling relationships describing canyon morphometry (e.g. scaling between maximum canyon dimensions, relationships of maximum canyon sidewall steepness with maximum canyon width and depth) can be recognized globally, suggesting their general predictive value; (ii) possible causal links are identified between hydrodynamic processes (e.g. upwelling, longshore- and along-slope currents) and canyon morphology; (iii) potential predictors of canyon geomorphology include whether a canyon is incised into the shelf or confined to the slope, the continental-margin type, the oceanographic environment, latitude, and shelf-break depth; (iv) similarity in maximum width-to-maximum depth ratios across all settings suggests that the relative magnitudes of canyon-margin erosion and intra-canyon deposition do not vary greatly depending on setting or canyon size.The relationships between canyon geomorphology and environmental variables identified in this study may be incorporated into conceptual models describing canyon geomorphology and its relationship to other elements of deep-water systems, and into its broader source-to-sink context.

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Continental slope-confined canyons in the Pearl River Mouth Basin in the South China Sea dominated by erosion, 2004–2018

Cited by 23 publications

References 97 publications

Upstream migrating knickpoints and related sedimentary processes in a submarine canyon from a rare 20-year morphobathymetric time-lapse (Capbreton submarine canyon, Bay of Biscay, France)

Upstream migrating knickpoints and related sedimentary processes in a submarine canyon from a rare 20-year morphobathymetric time-lapse (Capbreton submarine canyon, Bay of Biscay, France)

The role of sediment gravity flows on the morphological development of a large submarine canyon (Taiwan Canyon), north‐east South China Sea

A global analysis of controls on submarine-canyon geomorphology

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