People run away from a tidal bore as it surges past a barrier on the banks of Qiantang River, in Hangzhou, Zhejiang province August 12, 2014. (Photo by Reuters/Stringer)

A visitor falls after trying to run away from a wave caused by a tidal bore which surged past a barrier on the banks of Qiantang River, in Hangzhou, Zhejiang province August 14, 2014. (Photo by Reuters/Stringer)

Visitors fall to the ground after being hit by waves caused by a tidal bore which surged past a barrier on the banks of Qiantang River, in Hangzhou, Zhejiang province August 13, 2014. (Photo by Reuters/Stringer)

Visitors fall as they are hit by a wave caused by a tidal bore which surged past a barrier on the banks of Qiantang River, in Hangzhou, Zhejiang province August 14, 2014. (Photo by Reuters/Stringer)

A man (2nd L) takes pictures as visitors run away from a wave caused by a tidal bore which surged past a barrier on the banks of Qiantang River, in Hangzhou, Zhejiang province August 14, 2014. (Photo by Reuters/Stringer)

Visitors fall to the ground after being hit by waves caused by a tidal bore which surged past a barrier on the banks of Qiantang River, in Hangzhou, Zhejiang province August 13, 2014. (Photo by Reuters/Stringer)

A man's trousers is torn as he fell to the ground after being hit by waves caused by a tidal bore, which surged past a barrier on the banks of Qiantang River, in Hangzhou, Zhejiang province August 13, 2014. (Photo by Reuters/Stringer)

Visitors run away from a tidal bore as it surges past a barrier on the banks of Qiantang River in Hangzhou, Zhejiang province, September 20, 2013. (Photo by Reuters/China Daily)

Visitors run from waves caused by a tidal bore as it surges past a barrier on the banks of Qiantang River, in Hangzhou Zhejiang province, September 21, 2013. (Photo by Reuters/Stringer)

A tidal wave hits a bank along the Qiantang River on August 22, 2013 in Haining, China. The 12th typhoon Trami landed in Fujian province at 2:40 am and led gales and heavy rainfalls in east China. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images)

People run away as surging waves of Qiantang River run across the levee in Haining City, east China's Zhejiang Province, August 22, 2013. (Photo by Sun Fengli/Xinhua/ZUMA Press)

A tidal wave hits a bank along the Qiantang River on August 22, 2013 in Haining, China. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images)

People on the levee are swept away by surging waves of Qiantang River in Haining City, east China's Zhejiang Province, August 22, 2013. The power of Typhoon Trami, was felt in the tidal bore of the Qiantang River, known as the world's largest tidal bore. (Photo by Sun Fengli/Xinhua/ZUMA Press)

Spectators are swept by huge waves while watching tides at a dike of Qiantang River on August 30, 2011 in Haining, Zhejiang Province of China. (Photo by ChinaFotoPress/Getty Images)

Spectators are swept by huge waves while watching tides of Qiantang River at a dike on August 31, 2011 in Haining, Zhejiang Province of China. More than 20 spectators were injured by strong tides as the typhoon Nanmadol approached on Wednesday. (Photo by ChinaFotoPress/Getty Images)