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Mathematical Modeling and Computational Analysis of Underwater Topography with Global Positioning and Echo Sounder Data

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Journal of Applied Mathematics and Physics 2021年第5期9卷 1171-1179页

作者： Satoshi Iwakami masahiko tamega Masahide Sanada Michiaki Mohri Yoshitaka Iwakami Naoki Okamoto Ryousuke Asou Shuji Jimbo Masaji Watanabe Earth Rise Company Inc. Okayama Japan Visiting Researcher Okayama University Okayama Japan Specially Appointed Professor Okayama University Okayama Japan

This study focuses on change of topography in a water area. Output data from a GPS unit and an echo sounder data were incorporated into analysis for construction of underwater topography. Comparison of two data sets ... 详细信息

关键词： Underwater Topography RTK-GPS Echo Sounder

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Study on Change of Topography in Water Area with Field Measurement

Study on Change of Topography in Water Area with Field Measu...

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作者： Satoshi Iwakami masahiko tamega Masahide Sanada Michiaki Mohri Yoshitaka Iwakami Naoki Okamoto Shuji Jimbo Masaji Watanabe Earth Rise Company Inc. Okayama University

Disastrous flood events in recent years include 2018 Japan floods（July 2018）,Typhoon 19（Hagibis, October 2019） and the following heavy rain event, and July 2020 heavy rain disaster. Such disastrous flood events are expected to occur more frequently as the climate change progresses, and it is indispensable to update information regarding water areas such as rivers, reservoirs, and coastal waters. This study demonstrates practical techniques to analyze underwater topography. Longitude and latitude components of ellipsoidal data recorded by a GPS receiver are projected to a rectangular coordinate system,and results are combined with vertical components including data recorded by an echo sounder unit so that tracks on an underwater floor are obtained. A mapping on a finite dimensional space of continuous functions over a triangular mesh is formulated, and its fixed point gives rise to an underwater floor that fits the tracks. Our techniques are illustrated with data obtained in measurement conducted in a reservoir called Kojima Lake located in Okayama Prefecture, Japan.

关键词： Underwater Topography RTK-GPS Echo Sounder Triangular Mesh Fixed Point Iteration

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Mathematical Modeling and Computational Analysis of Underwater Topography with Global Positioning and Echo Sounder Data

Mathematical Modeling and Computational Analysis of Underwat...

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作者： Satoshi Iwakami masahiko tamega Masahide Sanada Michiaki Mohri Yoshitaka Iwakami Naoki Okamoto Ryousuke Asou Shuji Jimbo Masaji Watanabe Earth Rise Company Inc. Visiting Researcher Okayama University Specially Appointed Professor Okayama University

关键词： Underwater Topography RTK-GPS Echo Sounder

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