Inverse estimation of drifting-object outflows using actual observation data

Shin'ichiro Kako, Atsuhiko Isobe, Satoquo Seino, Azusa Kojima

研究成果: ジャーナルへの寄稿学術誌査読

28 被引用数 (Scopus)


The present study attempts to establish a scientifically reliable method capable of computing the drifting-object sources and their outflows. First, the temporal variability of the drifting-object amount is investigated every two months on a beach west of Japan, where various source regions are anticipated because of spatiotemporally variable northeastward ocean currents over the East China Sea. Next, in order to specify drifting-object sources, two-way particle tracking model (PTM) experiments are carried out using simulated ocean currents and leeway drift estimated from QuikSCAT/Seawinds wind data. Finally, an inverse method with a Lagrange multiplier is applied to estimate drifting-object outflows at each source on the basis of the two-way PTM results and beach surveys. Accuracy of object-source identification using the two-way PTM is validated by comparing disposable-lighter sources suggested by phone numbers printed on the lighter surface with those computed by the model. In order to examine the reliability of the inverse estimation, the number of plastic-bottle caps found in actual beach surveys is compared with that computed using a forward in-time PTM during the same period of actual beach surveys, over which the outflows obtained using the inverse method are given at each source in the model.

ジャーナルJournal of Oceanography
出版ステータス出版済み - 4月 2010

!!!All Science Journal Classification (ASJC) codes

  • 海洋学


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