A Discussion on Monitoring the Algal Bloom in Daning River during the Recession Period of the Three Gorges Reservoir

The green algae bloom was seen in Baishui River,a tributary of Daning River of the Three Gorges Reservoir in the first half year of 2011.The on-site monitoring was carried out with the DS5x portable multi-parameter water quality Detector.The analysis shows that there is a positive correlation between DO,pH,PCY and chlorophyll.The monitoring of the water column shows that the water temperature,DO,pH,PCY and chlorophyll are declining until reaching a depth of 5 meters.Therefore,it is suggested to take the on-site monitoring indexes to determine the severity of algal bloom during its emergency monitoring.