8/16/2019 Predicting Physical Properties of Surficial Marine
Sediment Using Sonar Data
1/1
9th Asian Rock Mechanics Symposium ARMS918-20 October 2016,
Bali, Indonesia
Predicting Physical and Acoustic Properties of Surficial Marine
Sedimentusing Sonar Data
Fredo Y. Kaswiyanto a* and Rudhy A.Tanjungb
a PT. Bintang Subsea Indonesia, Indonesiab Laboratory
of Geomechanics and Mining Equipment, Institut Teknologi Bandung,
Indonesia
* [email protected] (corresponding
author’s E-mail)
Abstract
The classification of surficial marine sediment by its physical
and material properties is necessity to produce lithology
model, which be able to assist the marine planner to design the
marine facility orstructure. Material classification can be
determined on laboratory testing of samples from marinegeotechnical
boring or using empirical approach by marine sondir activity.
LeBlanc et al (1991) proposed a method to classify surficial
marine sediments without contact with seabed. This
remoteclassification using low frequencies of acoustic wave by
chirp sonar. Chirp sonar measured reflectivitylevel of the seabed
to calculate the acoustic impedance between the sediments. LeBlanc
presented the
relationship between acoustic impedance and sediments properties
i.e. bulk density, sound speed,rigidity and porosity. Schock (2004)
also proposed a method for estimating the physical and
acoustic properties of surficial marine sediment based on Biot
model, from normal incidence reflection dataacquired by a chirp
sonar. Schock mentioned that remote estimates of porosity, grain
size and permeability agree with direct measurement collected
at the 1999 in the South China Sea.
This paper will apply and clarify this methods to predict marine
sediment properties at several sitesand using various sonar systems
with different resolution and penetration level i.e. boomer,
sparker, pinger and chirp sonar itself. The prediction of
these marine sediment properties will be compared withdirect
measurement from marine geotechnical boring on those locations.
Keywords: Submarine environment, Physical and acoustic
properties, Remote estimation of marinesediment properties, Sonar
data.
