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Title:
Correction of error due to vessel movement in underwater topographic data measurement |
Abstract:
Recent heavy rain disasters brought tremendous human damages and material damages. One speculation is that disastrous heavy rain events may increase in frequency and scale as the climate change progresses. Therefore the preventive maintenance of rivers, reservoirs, and coastal areas as well as measurement and analysis for the topography of water areas become more important than they used be. This study focuses on development and application of techniques concerning the topography of water areas.
Vertical components of ellipsoidal coordinates recorded by a GPS receiver and/or a GNSS receiver are combined with depth data recorded by an echo sounder unit so that underwater topographic data are obtained.Mappings on finite dimensional spaces of continuous functions defined on triangular meshes give rise to continuous functions that represent the topography of water areas.In particular, this study focuses on the incorporation of techniques to correct errors due to vessel movement.Results of measurement and analysis for underwater topographic data of a water area illustrate our techniques.
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Biography:
Professor Masaji Watanabe(Emeritus Professor, Specially Appointed Professor, Okayama University)is active in research areas of applied mathematics, and his recent research topics include studies on underwater topography. His recent academic activities include joint studies on measurement and computational analysis of underwater topography with Mr. Satoshi Iwakami, Mr. Masahiko Tamega, Mr. Masahide Sanada, Mr. Michiaki Mohri, Mr. Yoshitaka Iwakami, Mr. Naoki Okamoto, Mr. Eishi Mitsui(Earth Rise Company, Inc., Okayama, Japan), Dr Shuji Jimbo(Visiting Researcher, Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan). Professor Hidetaka Chikamori, and Associate Professor Ryosuke Akoh(Faculty of Environmental, Life, Natural Science and Technology, Okayama University). He specializes in development and application of mathematical techniquessuch as mathematical modeling, inverse analysis, and numerical simulation.
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