Modelling and visualizing the fate of shrimp pond effluent in a mangrove-fringed tidal creek

摘要: Abstract Field and model studies were carried out of the flushing processing shrimp pond effluent in a mangrove-fringed tidal creek, Port Douglas, Australia. Tidal results concentration dissolved particulate nutrients decreasing with distance downstream. Flushing is slow this 6 km long mangrove residence time varying between four days at spring tides 10–15 neap tides. Since alternate seven intervals, system never equilibrium. As result, occasional along-channel sampling sediment provide little information on fate effluent. A quantitative estimate physical biological processes suspended sediments creek was made possible by comparing their discharge from farm net, tidal-averaged point 1·3 km Significant changes discharges occurred creek; chl a TDN increasing DON, PC, TDN, TDP being removed creek. The very sensitive to natural, small-scale variability may be under-sampled triplicate samples. High concentrations plankton downstream interact matter (mud, detritus mangroves effluent) generate muddy marine snow. Muddy snow not present non-impacted creeks. Several limit eutrophication. These are flushing, secondly, selective settling low nutrient particles, thirdly, dilution original mud, finally, bacteria mineralizing