Regensburg 2007 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 4: Ozeanographie, Hydro- und Kryosphäre

UP 4.3: Vortrag

Montag, 26. März 2007, 12:15–12:30, H48

Internal wave beams driven by internal seiching of a pit lake — •Bertram Boehrer¹, Craig Stevens², and Gregory Lawrence³ — ¹Helmholtz-Zentrum für Umweltforschung, Brueckstraße 3a, D-39114 Magdeburg, Germany. (bertram.boehrer@ufz.de) — ²New Zealand National Institute for Water and Atmospheric Research, PO Box 14-901, Kilbirnie, Wellington, New Zealand. (c.stevens@niwa.co.nz) — ³Department of Civil Engineering, University of British Columbia, Vancouver, Canada V6T 1Z4. (lawrence@civil.ubc.ca)

Internal wave beams can be created by the internal seiche moving the stratified waters over the bench structure of the side walls of Island Copper mine pit lake. The first-mode seiche determines the frequency and its presence for several oscillation periods guarantees a sharp enough frequency band that interference patters can establish. The bench width, a residual feature of the mining, determines the horizontal wave length [1][2]. Both magnitudes, frequency and horizontal wavelength, fully define the path of the propagation of the wave beam, e.g. its angle against the vertical, through a given density stratification. Under the assumption, that the ray waves are reflected to a large portion at the sharp halocline, the resulting self-interference pattern can be evaluated.

[1] Boehrer, B., and C. Stevens (2005), Ray waves in a pit lake, Geophys. Res. Lett., 32, L24608 [2] Stevens, C., T.S.R. Fisher, and G.A. Lawrence (2005), Turbulent layering beneath the pycnocline in an strongly stratified pit lake, Limnol. Oceanogr., 50, 197* 206.