The Accuracy Study of Sounding Measured by a Tilted Multi-beam Transducer
Date Issued
2008
Date
2008
Author(s)
Wang, Shih-Ching
Abstract
When we are conducting underwater topography survey, in the bank region with steep slopes, in which cannot be measured by a down-looking multi-beam transducer. As a result it generally rotates the transducer such that the outermost beams can reach the surface of the slope. After survey, measurement collected by a down-looking multi-beam transducer will be merged the measurement collected by a tilted transducer, but experience indicated these two acts of data did not fit together while doing data processing. This study is the purpose to analyze the accuracy of soundings measured by a tilted multi-beam transducer. Results indicate that roll offset angle shall cause the slope at inaccurate gradient, and the pitch offset angle brings a slope of concave / convex slopeness the error shall appears most in the outermost beams that approach toward coastline, and gives gentle slope.n order to make sure that we can have high accurate slope topography by using a multi-beam transducer rotated 45 degree to the slope, this study thus provide the guidelines which may reduce the error to its minimal. When using Seabat 9001 multi-beam system, a 45degree tilted transducer can only be applied to the slope more than 30degrees. In addition, survey track shall not follow the coastline of “S” shape, because it will create error measurement significantly. Finally, survey track shall close to coastline as near as possible to reduce the effect caused by yaw offset.
Subjects
tilted transducer
multi-beam bathymetry
roll offset
pitch offset
yaw offset
Type
thesis
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ntu-97-R94241309-1.pdf
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