Since mid-June 2008, a large number of Enteromorpha prolifera drifted from the middle of the Yellow Sea to the waters near Qingdao. Qingdao coastal waters and the coast suffered a sudden and rare Enteromorpha prolifera disaster.
In July 2011, a large area of Enteromorpha prolifera entered Qingdao, Yantai, Weihai, Rizhao and other coastal waters of Shandong Province. Some beaches were accumulated a thick Enteromorpha prolifera, which seems like the prairie. The coastal culture and tourism industry were adversely affected.
Affected by ocean currents and wind direction, the largest wave of Enteromorpha prolifera floated to Qingdao from July 2, 2013.