Study On The Marine Environment Impact Of Dredged Materials Disposal Sites In The Estuary Of Daya Bay

In order to maintain the regular operation of harbours, wharfs and channels, dredging is necessary. In the process of cleaning harbours, wharfs and channels, dredged spoils is dredged up. The main component of dredged spoils is natural deposit. Because harbours, wharfs and channels are affected by the human activities, so the dredged spoils includes small pollutant. When dredged spoils is dumping into the internal sea, the environment impact of dredged materials disposal sites must be assessed and some protection measures are formulated so as to prevent pollution damage to the marine environment, maintaining ecological balance, promoting sustainable economic and social development.According to the five-survey investigation information made by South China Sea Branch from 2001 to 2003, the accessment mothed of singal-factor index, the sub-index method of multi-facter and the diversity index of Shannon-Wiener are adopted. It is analyzed and assessed that the environment quality that is before dumping, between dumping and after dumping. The assessment results show that the water quality status in the dumping of Dapen Bay is good, the bottom quality, the water quality and the biological community hasn't obviously influenced, althought dredged spoils dumped into the internal sea makes some effect to the water quality in Dapen Bay. If the deposal sites has strong physical diffuse power, the dumping activity is arranged scientifically, the effect to the environment is limited and temporary.