Abstract
It is the best time to view tidal bores in lunar August in the Qiantang River Estuary, but it happens to be a time of typhoon occurs frequently. The effect of typhoons on the Qiantang bore still remains to be studied. Herein, typhoon Yagi making landfall in the Zhejiang coast during astronomical spring tide in 2018 was chosen to study the effect of typhoon on tidal bores. Based on the validation of wind speed, tidal level and tidal bore height during typhoon Yagi, a three-dimensional typhoon model combined with a parametric hurricane model is developed to investigate the effect of this typhoon on tidal bores. Numerical results demonstrate that the direct effect of wind-pressure field plays a significant role in the upper reach of the estuary. Affected by typhoon Yagi, the height of both the line-shape tidal bore and the back-flow tidal bore was remarkably increased. The enhanced tidal bore is earlier to be formed in the Yanguan reach during typhoon Yagi. The Qiantang bore is indirectly affected by increasing tidal range in the lower reach. The typhoon-induced storm surge progresses into Hangzhou bay and induces to form a more spectacular tidal bore in the inner estuary.
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