Abstract
A stratified flow is generated along an inclined bed, when density anomaly is produced by anaerobic release of dissolved substances such as non-organic nutrients and metal ions from a “water-sediment” interface. A hybrid analysis of turbulent transport in the ambient water and chemical and biochemical reactions in the sediment was performed in order to obtain solutions of release flux of phosphorus and iron, sediment oxygen demand, profiles of their concentration and velocity. It was discussed how the bed slope, dissolved oxygen amount and velocity in the ambient water, concentration of phosphorus and iron in the sediment affect the transport rate of dissolved substances and sediment oxygen demand. The present study shows that buoyancy effect plays an important role in water quality transport across an anaerobic “water-sediment” interface.
