Stratigraphic Model Predictions of Geoacoustic Properties

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	Stratigraphic Model Predictions of Geoacoustic Properties
	Barbara J. Kraft ; Member ; IEEE ; Irina Overeem ; Charles W. Holland ; Lincoln F. Pratson ; James P. M. Syvitski ; Larry A. Mayer
发表期刊	Oceanic Engineering
ISSN	0364-9059
	2006
卷号	31 期号:2 页码:266-283
英文摘要	Geoacoustic properties of the seabed have a controlling role in the propagation and reverberation of sound in shallow-water environments. Several techniques are available to quantify the important properties but are usually unable to adequately sample the region of interest. In this paper, we explore the potential for obtaining geotechnical properties from a process-based stratigraphic model. Grain-size predictions from the stratigraphic model are combined with two acoustic models to estimate sound speed with distance across the New Jersey continental shelf and with depth below the seabed. Model predictions are compared to two independent sets of data: 1) Surficial sound speeds obtained through direct measurement using in situ compressional wave probes, and 2) sound speed as a function of depth obtained through inversion of seabed reflection measurements. In water depths less than 100 m, the model predictions produce a trend of decreasing grain-size and sound speed with increasing water depth as similarly observed in the measured surficial data. In water depths between 100 and 130 m, the model predictions exhibit an increase in sound speed that was not observed in the measured surficial data. A closer comparison indicates that the grain-sizes predicted for the surficial sediments are generally too small producing sound speeds that are too slow. The predicted sound speeds also tend to be too slow for sediments 0.5-20 m below the seabed in water depths greater than 100 m. However, in water depths less than 100 m, the sound speeds between 0.5-20-m subbottom depth are generally too fast. There are several reasons for the discrepancies including the stratigraphic model was limited to two dimensions, the model was unable to simulate biologic processes responsible for the high sound-speed shell material common in the model area, and incomplete geological records necessary to accurately predict grain-size
语种	英语
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/3073
专题	科研共享资源
推荐引用方式 GB/T 7714	Barbara J. Kraft,Member,IEEE,et al. Stratigraphic Model Predictions of Geoacoustic Properties[J]. Oceanic Engineering,2006,31(2):266-283.
APA	Barbara J. Kraft.,Member.,IEEE.,Irina Overeem.,Charles W. Holland.,...&Larry A. Mayer.(2006).Stratigraphic Model Predictions of Geoacoustic Properties.Oceanic Engineering,31(2),266-283.
MLA	Barbara J. Kraft,et al."Stratigraphic Model Predictions of Geoacoustic Properties".Oceanic Engineering 31.2(2006):266-283.

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