Open AccessTOPOGRAPHICALLY INDUCED TURBULENCE ON CONTINENTAL SHELF OFF JOGASHIMA, SAGAMI BAY, JAPAN
Author(s) -
Yuli Naulita
Publication year - 2015
Publication title -
jurnal ilmu dan teknologi kelautan tropis
Language(s) - English
Resource type - Journals
eISSN - 2620-309X
pISSN - 2087-9423
DOI - 10.29244/jitkt.v6i2.9023
Subject(s) - isopycnal , turbulence , geology , continental shelf , ridge , oceanography , bay , current (fluid) , flow (mathematics) , boundary layer , meteorology , mechanics , geography , physics , paleontology
Direct turbulence measurements using TurboMAP over a “small ridge” on the continental shelf off Jogashima, Sagami Bay, Japan revealed an active layer of topographically induced turbulence. The active layer ( = 10-7 - 10-6 W kg-1) located at mid-depth of 200 – 250 m, occurred on alternate side of “small ridge” depending on the direction of the tidal current. This active layer was accompanied by rebounded-isopycnal surfaces 26.0 - 26.1 σθ , in which all in qualitative manner showed an internal hydraulic flow control on the shelf. The turbulence friction velocity was two order of magnitude lower than observed- in this active layer explaining a less role of bottom friction than hydraulic flow to the high turbulence layer. Keywords: topographically induced turbulence, continental shelf, internal hydraulic flow