Nearshore Surveying: Accuracy and Techniques for Improvement
Publication: Journal of Surveying Engineering
Volume 121, Issue 2
Abstract
Various concerns of beach and nearshore survey accuracy including methodologies and equipment are addressed. First, four types of horizontal distance measurement apparatus (survey tape, infrared apparatus, microwave and optical range finder) are evaluated through intercomparison of field measurements. Second, analysis methods are developed and applied to horizontal positioning data obtained from triangulation surveys. The method provides the most probable location accompanied with a measure of uncertainty based on general characteristics of arc intersections. Finally, methods are developed for the postprocessing of standard bathymetric data obtained from a combination of land and boat surveys with a certain overlap region. The general method considers adjustments to both the vertical and horizontal positions obtained by a Fathometer and a microwave system, respectively, through offsets and linear scale factors such that for each profile line, there is a maximum of four free parameters to be optimized. The method is applied to a set of field data and compares the improvements obtained by allowing different numbers of free parameters.
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References
1.
ASCE Task Committee on Hydrographic Investigations, Technical Committee on Waterways of the Waterway, Port, Coastal and Ocean Division. (1983). “Measurement of hydrographic parameters in large sand-bed streams from boats.”Rep., ASCE, New York, N.Y.
2.
Clausner, J. E., Birkemeier, W. A., and Clark, G. R. (1986). “Field comparison of four nearshore survey systems.”USACE CERC Misc. Pap. Cerc-86-6.
3.
Dally, W. R. (1993). “An overview of coastal surveying technology for documenting beach-inlet interaction.”J. Coast. Res., Special Issue No. 18, 291–300.
4.
Downing, G. C., and Fagerburg, T. L. (1987). “Evaluation of vertical motion sensors for potential application to heave correction in Corps hydrographic surveys.”USACE Tech. Rep. HL-87-10, WES Hydraulics Dept.
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Hart, E. D., and Downing, G. C. (1977). “Positioning techniques and equipment for U.S. Army Corps of Engineers hydrographic surveys.”U.S. Army Engr. WES, Tech. Rep. H-77-10.
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Copyright © 1995 American Society of Civil Engineers.
History
Published online: May 1, 1995
Published in print: May 1995
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