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Effects of inadequate surface sound speed measurements in multibeam echosounder systems

In any type of survey work, variation of the characteristics of the medium through which the measurements are made is a challenge, thus; having serious effects on the accuracy of the measurements. In hydrographic surveying, the effects are even greater when using sonar techniques. The single most im...

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Main Authors: Mahmud, Mohd. Razali, M. D. E. K., Gunathilaka
Format: Conference or Workshop Item
Language:English
Published: 2007
Subjects:
TA Engineering (General). Civil engineering (General)
Online Access:http://eprints.utm.my/id/eprint/4677/1/73_b__Mohd_Razali_Mahmud_%26_Guna_EFFECTS__OF_INADEQUATE.pdf
http://eprints.utm.my/id/eprint/4677/
http://www.insidegnss.com/node/13
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spelling my.utm.46772017-10-31T05:09:19Z http://eprints.utm.my/id/eprint/4677/ Effects of inadequate surface sound speed measurements in multibeam echosounder systems Mahmud, Mohd. Razali M. D. E. K., Gunathilaka TA Engineering (General). Civil engineering (General) In any type of survey work, variation of the characteristics of the medium through which the measurements are made is a challenge, thus; having serious effects on the accuracy of the measurements. In hydrographic surveying, the effects are even greater when using sonar techniques. The single most important acoustical variable in the water is its speed. Average speed of sound in the ocean is 1500m/s. But its precise value in a location is strongly depending on temperature, pressure and salinity of that particular location. These factors changes rapidly in time and space due to various reasons like solar heating, evaporation, precipitation, fresh water inflow etc… and water movements like tides, currents and wave actions. In data acquisition, the collection of these dense sound speed data becomes critical. These inadequate sound speeds create unknown propagation through the water column that adds a major uncertainty to multibeam echosounder (MBES) measurements. There are two types of sound speed measurements made in Multibeam sonars. Surface sound speed (SSS) measured at the face of the transducer and sound speed profile (SSP) through the water column. SSS is used to determine the beam pointing angle and SSP is used to determine the depth and position of each beam. This paper explains the necessity of the surface sound speed in multibeam sonars and effects generated by inadequate SSS measurements using real data from RESON SeaBat 8124 multibeam system. When the vessel roll is significant, the roll modulate the errors induced by erroneous SSS measurements. These errors are illustrated in relation to the IHO standards. 2007-11-07 Conference or Workshop Item PeerReviewed application/pdf en http://eprints.utm.my/id/eprint/4677/1/73_b__Mohd_Razali_Mahmud_%26_Guna_EFFECTS__OF_INADEQUATE.pdf Mahmud, Mohd. Razali and M. D. E. K., Gunathilaka (2007) Effects of inadequate surface sound speed measurements in multibeam echosounder systems. In: Joint International Symposium and Exhibition on Geoinformation and International Symposium and Exhibition on Gps/Gnss 2007, 5-7 November 2007, Persada Johor INternational Convention Centre,Johor Bahru, Johor. http://www.insidegnss.com/node/13
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Mahmud, Mohd. Razali
M. D. E. K., Gunathilaka
Effects of inadequate surface sound speed measurements in multibeam echosounder systems
description In any type of survey work, variation of the characteristics of the medium through which the measurements are made is a challenge, thus; having serious effects on the accuracy of the measurements. In hydrographic surveying, the effects are even greater when using sonar techniques. The single most important acoustical variable in the water is its speed. Average speed of sound in the ocean is 1500m/s. But its precise value in a location is strongly depending on temperature, pressure and salinity of that particular location. These factors changes rapidly in time and space due to various reasons like solar heating, evaporation, precipitation, fresh water inflow etc… and water movements like tides, currents and wave actions. In data acquisition, the collection of these dense sound speed data becomes critical. These inadequate sound speeds create unknown propagation through the water column that adds a major uncertainty to multibeam echosounder (MBES) measurements. There are two types of sound speed measurements made in Multibeam sonars. Surface sound speed (SSS) measured at the face of the transducer and sound speed profile (SSP) through the water column. SSS is used to determine the beam pointing angle and SSP is used to determine the depth and position of each beam. This paper explains the necessity of the surface sound speed in multibeam sonars and effects generated by inadequate SSS measurements using real data from RESON SeaBat 8124 multibeam system. When the vessel roll is significant, the roll modulate the errors induced by erroneous SSS measurements. These errors are illustrated in relation to the IHO standards.
format Conference or Workshop Item
author Mahmud, Mohd. Razali
M. D. E. K., Gunathilaka
author_facet Mahmud, Mohd. Razali
M. D. E. K., Gunathilaka
author_sort Mahmud, Mohd. Razali
title Effects of inadequate surface sound speed measurements in multibeam echosounder systems
title_short Effects of inadequate surface sound speed measurements in multibeam echosounder systems
title_full Effects of inadequate surface sound speed measurements in multibeam echosounder systems
title_fullStr Effects of inadequate surface sound speed measurements in multibeam echosounder systems
title_full_unstemmed Effects of inadequate surface sound speed measurements in multibeam echosounder systems
title_sort effects of inadequate surface sound speed measurements in multibeam echosounder systems
publishDate 2007
url http://eprints.utm.my/id/eprint/4677/1/73_b__Mohd_Razali_Mahmud_%26_Guna_EFFECTS__OF_INADEQUATE.pdf
http://eprints.utm.my/id/eprint/4677/
http://www.insidegnss.com/node/13
_version_ 1643644122135789568
score 13.211869

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