*Journal of Oceanography,* Vol. 61 (No. 4), pp. 789-794, 2005

*Short Contribution*
## Least-Squares Estimation of Bottom Topography Using Horizontal Velocity Measurements in the Tsushima/Korea Straits

Naoki Hirose*

Dynamics Simulation Research Center, Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan

(Received 31 March 2004; in revised form 28 October 2004; accepted 29 October 2004)

**Abstract: **
Several bathymetric data sets are compared and assessed with constraints of an ocean current model and velocity observations. The root-mean-square (rms) differences among the data sets reach 20 m in the shallow Tsushima/Korea Straits. The numerical experiments to simulate the Tsushima Warm Current are performed using four different topography data sets. The JTOPO1 data (MIRC, 2003) give the smallest rms difference to long-term horizontal velocity observations. Several least-squares combinations of the topography data sets are then sought to minimize the rms difference between the observed and modeled barotropic velocities. Most of the data sets reveal a large bias of 30-60 m at the Western Channel compared to independent sounding depths

*E-mail: hirose@riam.kyushu-u.ac.jp

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