The occurrence, acoustic characteristics, and significance of submerged reefs on the continental shelf edge and upper slope, northern South China Sea

Li, Xishuang; Li, Xinzhong; Zhao, Qiang; Liu, Lejun; Zhou, Songwang

doi:10.1016/j.csr.2015.03.006

Cited by 5 publications

(4 citation statements)

References 56 publications

(65 reference statements)

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“…Recently, two shipborne multibeam bathymetric cruises were conducted in the Baiyun deep-water area, providing high-resolution bathymetric data that image the morphology of submarine canyons. Based on parts of these data and other acoustic data, Li et al (2015b) confirmed the existence of submerged reefs on the outer continental margin adjacent to the submarine canyons. The main aims of this work are: (1) to image the modern morphology of slopeconfined canyons, (2) to describe the variation in their morphology, and (3) to discuss the influence of the existence of submerged reefs and landsliding at the shelf edge on the morphology.…”

Section: Introductionsupporting

confidence: 70%

“…The maps are based on collected multibeam bathymetric data and bathymetric data derived from 3D exploration seismic data. The rough seafloor on the western shelf edge indicates the submerged reefs (Li et al 2015b). The broken white line denotes the landslide headwall along the lower slope.…”

Section: General Geomorphological Characteristicsmentioning

confidence: 98%

“…The heads of the canyons in the western group are located along the outer margin of the topographic high of the continental shelf edge and upper slope at a water depth of 140-420 m. A previous study shows that submerged/buried reefs are distributed on the topographic high and that there are at least four stages of submerged reefs developed since the Pleistocene (Li et al 2015b). The stability of the slope at the topographic high can be enhanced because of the existence of the reefs in the sediments.…”

Section: Submerged/buried Reefs Undulations Of Sediment and Canyon mentioning

confidence: 99%

“…The location of seismic lines is shown inFig. 2protrusion reflections interpreted byLi et al (2015b) as submerged/buried reefs. Sedimentary sequences exhibit wedge-shaped, steeply dipping progradational reflections, abruptly terminated at their upper interfaces and onlapping at their lower interfaces.…”

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Slope-confined submarine canyons in the Baiyun deep-water area, northern South China Sea: variation in their modern morphology

Zhou

et al. 2016

Mar Geophys Res

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On the basis of newly collected multibeam bathymetric data, chirp profiles and existing seismic data, we presented a detailed morphological interpretation of a series of slope-confined canyons in water depths of 300-2000 m in the Baiyun deep-water area, northern margin of the South China Sea. Although these canyons are commonly characterized by regular spacing and a straightline shape, they vary in their lengths, starting and ending water depths, canyon relief, slope gradients, wall slope gradients and depth profiles along the axis. The eastern canyons (C1-C8) have complex surface features, low values in their slope gradient, canyon relief and wall slope gradient and high values in their length and starting and ending depth contrasting to the western ones (C9-C17). From the bathymetric data and chirp profiles, we interpret two main processes that have controlled the morphology and evolution of the canyons: axial incision and landsliding. The western part of the shelf margin where there were at least four stages of submerged reefs differs from the eastern part of the shelf margin where sedimentary undulations occurred at a water depth of *650 m. We consider that the variation in morphology of submarine canyons in the study area is the result of multiple causes, with the leading cause being the difference in stability of the upper slope which is related to the submerged reefs and sedimentary undulations.

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Section: Introductionsupporting

confidence: 70%

Section: General Geomorphological Characteristicsmentioning

confidence: 98%

Section: Submerged/buried Reefs Undulations Of Sediment and Canyon mentioning

confidence: 99%

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