Numerical Techniques for Underwater Topographic Measurement with GPS and Echo Sounder

Satoshi Iwakami(1*), Masahiko Tamega(2), Shuji Jimbo(3), Masaji Watanabe(4),

(1) Earth Rise Co. Ltd., Okayama, Japan
(2) Earth Rise Co. Ltd., Okayama, Japan
(3) Graduate School of Natural Science, Okayama University, Okayama, Japan 3Specially
(4) Specially Appointed Professor, Okayama University, Okayama, Japan
(*) Corresponding Author


This study demonstrates numerical techniques for a topographic study of a water area. Data obtained by a GPS unit and an echo sounder were combined, and three dimensional data were generated. A problem to find a surface that contains those data points was reformulated to a problem to find a piecewise linear continuous function defined over a triangular mesh. An iterative method led to an approximation of a fixed point. Those techniques are illustrated, and numerical examples are introduced.

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平成30年7月豪雨災害の概要と被害の特徴,資料2-1,国土交通省 (1. Summary and characteristic of damages in 2018 Japan floods, Document 2-1, Ministry of Land, Infrastructure, Transport and Tourism).

令和元年台風第 19 号等に係る被害状況等について,令和元年 11 月 12 日 7 時 00 分現在,非常災害対策本部,内閣府 (Situation of damages and so forth concerning 2019 Typhoon 19 , November 12th , 2019, at 7:00, Head quarters for emergency disaster, Cabinet Office, Government of Japan)

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