Eutrophication of water body is caused by excessive micronutrients, which are essential nutrients for the growth of phytoplankton, unicellular algae and aquatic plants. The purpose of this paper is to study the coastal waters of intermittent forest bay from June to July, which is related to the change of water flow and water quality from June to July and the occurrence of water eutrophication. From June to July, 1963, due to the rapid growth of phytoplankton, the temperature was 29 ~ 32°C, the salinity was 26 ~ 30 PSU, the chlorophyll content was about 25 ppb, and the water-soluble oxygen content was 0 ~ 12 mg/L. Through statistical analysis, it is found that there is a correlation coefficient (r) in the data. In the range of seawater discoloration, from June 24th to July 1st, the seawater quality is relatively high, ranging from 20 cm/s to 45 cm/s, with high water temperature change, low water-soluble oxygen content, low salinity and high chlorophyll content.
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