Wilbert Lick, Ph.D.
University of California, Santa Barbara
November 20, 2002
3:00 p.m. –
sediments are a major problem in rivers, lakes, estuaries, and near-shore
areas of the oceans. If the problem
is severe enough, these sediments must be remediated. In eval-uating
potential remedial actions, the most significant problem is usually the
quantitative prediction of the fluxes of contam-inants between the
sediments and the overlying water under present and future conditions.
This involves the consideration
of big events, such as large storms and floods, and long-term
predictions—typically 10, 20, and 50 years. The flux of contam-inants
between sediments and overlying water is due to sedi-ment resuspension and
deposition, bioturbation, molecular diffusion, pore-water convection, and
gas transport. When chemicals have large partition coefficients, time-
dependent, non-equilibrium sorption continuously modifies the concentra-tions
and fluxes of these chemicals in the sediments. The various flux processes
as modified by time-dependent sorption will be described. Experimental
results and models of these processes will be used to estimate and compare
the mag-nitudes of these fluxes for different realistic conditions.
Fish vision and sexual communication in the kelp forest