Sandwaves on the Southeast Vietnam Shelf recorded by high resolution seismic profiles: formation and mechanism |
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| Authors: | Viet Dung Bui Alex Schimanski Karl Stattegger Phach Van Phung The Tiep Nguyen Tien Hai Nguyen Trung Thanh Nguyen and Truong Thanh Phi |
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| Institution: | (1) Institute for Marine Geology and Geophysics, 18 Hoang Quoc viet, Hanoi, Vietnam;(2) Institutes of Geosciences, Kiel University, D-24118 Kiel, Germany |
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| Abstract: | The application of high resolution seismic data using boomer sound source has revealed a wide distribution of large-scale
bedforms (sandwaves) on the Southeast Vietnam continental shelf. Bedforms that are a few meters high in wave height and hundreds
of meters long in wavelength are primarily developed in the inner shelf (20–40 m) and considered to be formed under the present-day
marine hydrodynamic conditions. Those bedforms developed in the deeper water (120 m) of the northernmost part of the continent
can be interpreted as the relict morphological features formed during the latest sea-level lowstand of the late Pleistocene
period. Two sediment transport paths have been identified on the basis of the bedform’s leeward orientation: northeast-southwest
(along-shore) and north-south (cross-shore). A quantitative bottom current map is constructed from sandwave dimensions, surface
sediments and measurement data. The strongest current velocities that gradually decrease toward the southwest are indicated
by large sandwaves in the north (field B). Water depth, surficial sediment composition and bottom current are three factors
that control the development of bedforms. |
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| Keywords: | bedforms sandwaves bottom currents Southeast Vietnam Shelf |
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