Sediments in the East China Sea

This paper describes measurements of sediments during the 2000-2001 Asian Seas International Acoustic Experiment in the East China Sea. A number of techniques were used to infer properties of these sediments, including gravity and piston cores, subbottom profiling using a water gun, long-range sedim...

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Bibliographic Details
Published in:IEEE journal of oceanic engineering 2004-10, Vol.29 (4), p.940-951
Main Authors: Miller, J.H., Bartek, L.R., Potty, G.R., Dajun Tang, Jungyul Na, Yiquan Qi
Format: Article
Language:English
Subjects:
Acoustic measurements
Acoustics
China
Chirp
Conductivity measurement
Experiments
Foundry sands
geoacoustic
Gravity
In situ measurement
Marine
piston cores
Pistons
Profiling
Sea measurements
Sea surface
Sediments
Thickness measurement
Tomography
Water
water gun
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Summary:This paper describes measurements of sediments during the 2000-2001 Asian Seas International Acoustic Experiment in the East China Sea. A number of techniques were used to infer properties of these sediments, including gravity and piston cores, subbottom profiling using a water gun, long-range sediment tomography, and in situ measurement of conductivity. Historical data from echosounder records and cores showed two regions of surficial sediments in the experimental area: a silty area to the west and a sandy area to the east. The tomography, cores, and water-gun measurements confirm the two surficial sediment regions seen in the historical data and also indicate that the subbottom structure at the experimental site consists of a thin (0-3 m thick) layer of sandy sediment directly beneath the sea floor. Below this layer, there is an extensive package of sediment with relatively uniform acoustic attributes. Core analysis shows that the surface sediment layer varies in compressional wave speed from a low near 1600 m/s in the west side of the experiment area to 1660 m/s in the east side of the experiment area. Long-range sediment tomography inversions show a similar spatial variation in the surface layer properties. In addition, the layer thickness as determined from tomography is consistent with the estimates from subbottom profiling.
ISSN:0364-9059
1558-1691
DOI:10.1109/JOE.2004.840725