Remote sensing of sediment density and velocity gradients in the transition layer

Charles Holland, Jan Dettmer, Stan E. Dosso

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

The geoacoustic properties of marine sediments, e.g., bulk density and compressional velocity, commonly exhibit large variations in depth near the water-sediment interface. This layer, termed the transition layer, is typically of O(10-1-100) m in thickness. Depth variations within the transition layer may have important implications for understanding and modeling acoustic interaction with the seabed, including propagation and reverberation. In addition, the variations may contain significant clues about the underlying depositional or erosional processes. Characteristics of the transition layer can be measured directly (e.g., coring) or remotely. Remote measurements have the advantage of sampling without disturbing the sediment properties; they also have the potential to be orders of magnitude faster and less expensive than direct methods. It is shown that broadband seabed reflection data can be exploited to remotely obtain the depth dependent density and velocity profiles in the transition layer to high accuracy. A Bayesian inversion approach, which accounts for correlated data errors, provides estimates and uncertainties for the geoacoustic properties. These properties agree with direct (i.e., core) measurements within the uncertainty estimates.

Original languageEnglish (US)
Pages (from-to)163-177
Number of pages15
JournalJournal of the Acoustical Society of America
Volume118
Issue number1
DOIs
StatePublished - Jul 1 2005

Fingerprint

transition layers
remote sensing
sediments
gradients
reverberation
estimates
velocity distribution
sampling
inversions
broadband
propagation
acoustics
Sediment
Layer
Remote Sensing
profiles
water
interactions

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

@article{b008ba0cd55f42849cfb6957c308f492,
title = "Remote sensing of sediment density and velocity gradients in the transition layer",
abstract = "The geoacoustic properties of marine sediments, e.g., bulk density and compressional velocity, commonly exhibit large variations in depth near the water-sediment interface. This layer, termed the transition layer, is typically of O(10-1-100) m in thickness. Depth variations within the transition layer may have important implications for understanding and modeling acoustic interaction with the seabed, including propagation and reverberation. In addition, the variations may contain significant clues about the underlying depositional or erosional processes. Characteristics of the transition layer can be measured directly (e.g., coring) or remotely. Remote measurements have the advantage of sampling without disturbing the sediment properties; they also have the potential to be orders of magnitude faster and less expensive than direct methods. It is shown that broadband seabed reflection data can be exploited to remotely obtain the depth dependent density and velocity profiles in the transition layer to high accuracy. A Bayesian inversion approach, which accounts for correlated data errors, provides estimates and uncertainties for the geoacoustic properties. These properties agree with direct (i.e., core) measurements within the uncertainty estimates.",
author = "Charles Holland and Jan Dettmer and Dosso, {Stan E.}",
year = "2005",
month = "7",
day = "1",
doi = "10.1121/1.1925988",
language = "English (US)",
volume = "118",
pages = "163--177",
journal = "Journal of the Acoustical Society of America",
issn = "0001-4966",
publisher = "Acoustical Society of America",
number = "1",

}

Remote sensing of sediment density and velocity gradients in the transition layer. / Holland, Charles; Dettmer, Jan; Dosso, Stan E.

In: Journal of the Acoustical Society of America, Vol. 118, No. 1, 01.07.2005, p. 163-177.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Remote sensing of sediment density and velocity gradients in the transition layer

AU - Holland, Charles

AU - Dettmer, Jan

AU - Dosso, Stan E.

PY - 2005/7/1

Y1 - 2005/7/1

N2 - The geoacoustic properties of marine sediments, e.g., bulk density and compressional velocity, commonly exhibit large variations in depth near the water-sediment interface. This layer, termed the transition layer, is typically of O(10-1-100) m in thickness. Depth variations within the transition layer may have important implications for understanding and modeling acoustic interaction with the seabed, including propagation and reverberation. In addition, the variations may contain significant clues about the underlying depositional or erosional processes. Characteristics of the transition layer can be measured directly (e.g., coring) or remotely. Remote measurements have the advantage of sampling without disturbing the sediment properties; they also have the potential to be orders of magnitude faster and less expensive than direct methods. It is shown that broadband seabed reflection data can be exploited to remotely obtain the depth dependent density and velocity profiles in the transition layer to high accuracy. A Bayesian inversion approach, which accounts for correlated data errors, provides estimates and uncertainties for the geoacoustic properties. These properties agree with direct (i.e., core) measurements within the uncertainty estimates.

AB - The geoacoustic properties of marine sediments, e.g., bulk density and compressional velocity, commonly exhibit large variations in depth near the water-sediment interface. This layer, termed the transition layer, is typically of O(10-1-100) m in thickness. Depth variations within the transition layer may have important implications for understanding and modeling acoustic interaction with the seabed, including propagation and reverberation. In addition, the variations may contain significant clues about the underlying depositional or erosional processes. Characteristics of the transition layer can be measured directly (e.g., coring) or remotely. Remote measurements have the advantage of sampling without disturbing the sediment properties; they also have the potential to be orders of magnitude faster and less expensive than direct methods. It is shown that broadband seabed reflection data can be exploited to remotely obtain the depth dependent density and velocity profiles in the transition layer to high accuracy. A Bayesian inversion approach, which accounts for correlated data errors, provides estimates and uncertainties for the geoacoustic properties. These properties agree with direct (i.e., core) measurements within the uncertainty estimates.

UR - http://www.scopus.com/inward/record.url?scp=22144462474&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=22144462474&partnerID=8YFLogxK

U2 - 10.1121/1.1925988

DO - 10.1121/1.1925988

M3 - Article

VL - 118

SP - 163

EP - 177

JO - Journal of the Acoustical Society of America

JF - Journal of the Acoustical Society of America

SN - 0001-4966

IS - 1

ER -