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(一)前言钱塘江河宽水浅,河口在平面上呈喇叭形,在纵剖面上则存在巨大沙坎。自乍浦至大尖山50余公里河段内,河床抬高近10米,底坡很陡。东海潮波进入杭州湾和钱塘江河口以后,由于平面上急剧收缩,江底迅速抬高,到大尖山附近潮波破碎,开始形成举世闻名的钱塘江涌潮。涌潮最高可达3米左右,潮流速实测最大达每秒12米,动力条件很强,对海塘等各种建
(A) Foreword Qiantang River is shallow water, the mouth was flared in the plane, there is a huge sand ridge in longitudinal section. From Zhapu to the Great Jianshan more than 50 km of river, the riverbed elevation of nearly 10 meters, the slope is very steep. After the tide of the East China Sea entered the estuary of Hangzhou Bay and the Qiantang River, the riverbed rapidly rose due to the sharp contraction in the plane. When the tidal wave near the Dachaoshan Mountains crumbled, the world-famous Qiantangjiang tide began to form. Tidal tide up to 3 meters, tidal velocity measured up to 12 meters per second, a strong dynamic conditions, such as the seawall and other construction