In very turbulent systems like shallow lakes and coastal waters with extensive contact between water and sediments with a high sorption capacity, the mass transfer across the sediment-water interface can be approached by a diffusion-advection term and an equilibrium term:
where C is the element concentration in the porewater, Ce is the equilibrium concentration, K is the sorption/ desorption rate, D is the effective diffusion coefficient, U is the advective transport of pore water, and z is the depth in the sediment. The steady-state solution gives
and if the seepage is neglected (U> 10~7ms_1) the equation is reduced to
Ifwe assume a film model for diffusive transport and ifthe flux at z = o is calculated, we can derive at a mass transfer KL equation:
Was this article helpful?
Learning About 10 Ways Fight Off Cancer Can Have Amazing Benefits For Your Life The Best Tips On How To Keep This Killer At Bay Discovering that you or a loved one has cancer can be utterly terrifying. All the same, once you comprehend the causes of cancer and learn how to reverse those causes, you or your loved one may have more than a fighting chance of beating out cancer.