Abstract
Since 2015, a novel green tide began to bloom along the Qinhuangdao coastal area in the Bohai Sea, China. A year-round field survey was conducted in 2016 to reveal the development process of the green tides. The hydrodynamic comparison between 2004 and 2016 was carried out through model simulation. The results of field investigations indicated that the green tides lasted about five months from the early April to late September. The macroalgae in the green tides were mainly suspended to shallow waters, and the biomass peaked in July and August, after which they declined rapidly in September. The species composition of the macroalgae changed obviously during the blooming period. The model analysis showed that the construction of artificial islands affected the hydrodynamic force and weakened the water velocity. Therefore, based on the development process of the tides, we speculated that (1) the coastal eutrophication might be the major cause of the Qinhuangdao green tides, and (2) Slow flow was conducive to the growth of macroalgae, promote the formation of the green tide. (3) Seawater temperature might be one of the main factors controlling the succession of green tide species in Qinhuangdao.
Published Version
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