Impact of land reclamation in Aiwan Cove on marine water quality in Zhejiang Province, China

摘要

A coupled hydrodynamic and water quality model based on MIKE 21 software was established to investigate the impact of land reclamation in Aiwan Cove, Zhejiang Province. The model was calibrated with the tidal level and current speed and direction measurements in the project area in 2013. The results showed that agricultural activities on the 1792 ha of the reclaimed land would cause severe water quality degradation of one class lower in nearly 3.69 km~2 of sea area in the case of one year return storm events. The pollutant transport is largely controlled by the local hydrodynamic conditions. The influenced area was larger if the runoff discharge occurred during the neap tide than during the spring tide, and if the runoff discharge occurred in the low tide period when the water depth was small. It is suggested that additional pollution control measures should be conducted on the land and the runoff discharge timing be considered as well.