Author Archives: jaj

Parametrization and evaluation of marine environmental impacts produced by deep-sea manganese nodule mining

Oebius, H.U., Becker, H.J., Rolinski, S., Jankowski, J.A.

Abstract. The evaluation of marine environmental impacts resulting from the exploitation of marine resources requires the numerical description, parametrization, and modelling of such processes in order to be able to transfer, compare, and forecast the effects of anthropogenic activities in the deep sea. One of the controversial effects is the formation and behaviour of sediment clouds as a consequence of anthropogenic activities on the seafloor. Continue reading →

The mesoscale sediment transport due to technical activities in the deep sea

J.A. Jankowski and W. Zielke

Abstract. This paper presents a mesoscale model for sediment transport in the deep sea resulting from technical activities such as manganese nodule mining. The model includes the temporal variability of ambient currents, the modification of the water density due to suspended sediments (density driven flow), bottom boundary-layer effects, and the influence of flocculation on the sediment settling velocity. It yields the three-dimensional sediment concentration and the bottom blanketing for time periods of up to a few weeks in areas of up to a few hundred square kilometers. The model also allows simulation of the mobilization, sorption and the transport of heavy metals. Continue reading →

Comparing numerical simulations of free surface flows using non-hydrostatic Navier-Stokes and Boussinesq equations

Jean-Michel Hervouet and Jacek A. Jankowski

Abstract. The numerical solutions of three-dimensional, non-hydrostatic Navier-Stokes equations are compared to the ones obtained with Boussinesq equations in the case of a solitary wave in a rectangular channel. Continue reading →

Telemac auf Origin2000 — Erste Erfahrungen

Rebekka Kopmann and Jacek A. Jankowski

Telemac auf Origin2000 — Erste Erfahrungen. Supercomputing News 1/2000 (BAW Hamburg).

The article describes the hands-on experiences by changing the principal supercomputer architecture from the vector to the parallel one, connected with the purchase of a shared-memory parallel SGI Origin 2000 machine by BAW for its Karlsruhe site. Continue reading →

Telemac 5.0 — Eine konservative Revolution

Jacek A. Jankowski and Jean-Michel Hervouet

Telemac 5.0 — Eine konservative Revolution. Supercomputing News 4/1999, BAW Hamburg.

The article describes the re-implementation of the Telemac system software from Fortran-77 to Fortran-90 and changes in the code due to the much larger possibilities of the newer programming language.