Abstract
Degradation of the deposited organic matter drives a return flux of dissolved components, which may profoundly affect the biogeochemical and ecological functioning of the water column. In addition to releasing solutes, sediments may also act as a sink with nutrients or trace metals remaining in the sediment after deposition, posing a huge risk to surface water quality and ecosystems. The problem of oxygen transport can not be directly solved by combining the mass transfer and the hydrodynamic movement equations, so the closures of analytical-experimental nature are proposed as a solution to this problem.