Effects of polluted grounds dumping on ecological conditions in coastal waters near Vladivostok
Results of experimental study on polluted grounds dumping impact on ecological conditions in coastal waters are presented. The grounds are excavated in the highly polluted Golden Horn Bay and moved to the Amur Bay or Ussuri Bay, where the dumped sediments could be transported on vast distance from the site of dumping under influence of water dynamics with accumulation of pollution both in deeper part of the bays and in their coastal zone. Inputs of the sediments with high concentrations of pollutants, nutrients, and organics is considered as a "trigger" for development of negative natural processes, such as hyper-eutrophication and hypoxia in bottom water layers in summer. Model of water currents and pollutants transportation is developed and applied for the case of polluted grounds dumping; the model showed good correspondence to the data of observations. Following to the model, in the case of dumping in the Ussuri Bay in summer, the polluted sediments are transported by water currents driven by southeastern winds toward the Bosphorus Eastern Strait where pollute the bays Ayaks, Paris, and Patrokl - the building yards of the objects of APEC summit, oceanarium, and the Far-Eastern federal university.