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The bottom topography of a lake is investigated. Numerical techniques to utilize positioning data and depth data are described. Data sets obtained in RTK-GPS positioning consist mainly of temporal, latitudinal, longitudinal, and altitudinal records. Data sets obtained in echo-sounder measurement consist of temporal records and depths. The latitudinal and longitudinal data are transformed to rectangular coordinates by the Gauss--Kruger Projection, and the resultant positional data sets are synchronized with depths to yield trajectories over the lake's floor. A bottom topography over a triangular mesh is updated using the positioning data and the depth data. References Shinya Sumida, Ying Liu, Yu Li, Kazuhiro Yamamoto, Majda Ceric, Masaji Watanabe, Numerical study of currents generated in a lake, and verification by experiment, ANZIAM J. , 49:C541--C558, May 2008. http://journal.austms.org.au/ojs/index.php/ANZIAMJ/article/view/365 Ying Liu, Kazuhiro Yamamoto, Majda Ceric, Masaji Watanabe, Numerical study of flow generated in a lake and experiment using GPS, ANZIAM J. , 50:C912--C929, June 2009. http://journal.austms.org.au/ojs/index.php/ANZIAMJ/article/view/1470 Kazuhiro Yamamoto, Hashentuya, Yoji Otani, Masaji Watanabe, Bottom Topography Measurement using RTK-GPS and High Precision Echo Sounder, CICC-ITOE 2011. Volume 2:309--312,2011 |
