钱塘江潮流对多桥的复杂响应
Complex Response of Tidal Flow to Multiple Bridges in Qiantang River
作者：孙志林(浙江大学 水利与海洋工程学系,浙江 杭州310028)；黄赛花(浙江大学 水利与海洋工程学系,浙江 杭州310028)；祝丽丽(浙江大学 水利与海洋工程学系,浙江 杭州310028)
Author：(Dept. of Hydraulic and Ocean Eng., Zhejiang Univ., Hangzhou 310028,China)；(Dept. of Hydraulic and Ocean Eng., Zhejiang Univ., Hangzhou 310028,China)；(Dept. of Hydraulic and Ocean Eng., Zhejiang Univ., Hangzhou 310028,China)
收稿日期：2006-05-18 年卷（期）页码：2007,39(5):10-15
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：钱塘江;潮流;复杂响应;桥梁;数值模拟
Key words：Qiantang River; tidal flow; complex response; bridge; numerical simulation
基金项目：国家自然科学基金资助（50079025;40231017）
中文摘要
钱塘江河口已建及拟建桥梁多座,多桥对潮流场的联合作用至今知之甚少。采用Delft3D数学模型就单桥、多桥不同组合方案对钱塘江河口流场进行系列数值试验,藉以探讨潮流对多桥的复杂响应。与无桥情形相比,单桥上下游流速普遍减缓,大潮涨急时下游壅水区可达十余公里之远,桥位越靠下游流场变化越显著。潮流对多桥的响应复杂,在多桥联合作用区域,潮流速显著减小,同一观察点流速随桥梁数增加而渐次降低。在多桥的上下游,桥梁对潮位的影响叠加,而在多桥范围内,这种影响部分相抵。桥墩阻水作用使桥上游进潮量减小,多桥时进潮量的减小甚为可观。
英文摘要
Many bridges have been and will be built up on Qiantang River,but so far people know little about the effect of multiple bridges on the tidal current.Delft3D mathematic model is used to numerical experiment on tidal current in Qiantang River with some different bridge schemes so that complex response of tidal flow to multiple bridges is studied.In comparison with the scheme of no bridges,velocity decreases upstream and downstream for single bridge scheme and the region of backwater in the strength of flood is more than 10 km.The lower bridge lied,the greater variation of tidal velocity was.Response of tidal flow to multiple bridges was complicated.In the region where multiple bridges’ effect occurred, tidal current velocity is obviously reduced,and the gradational decrease of velocity at the same point exists along with the increase in bridge number.The influence of bridges to tidal level superposed at the upstream and downstream of all bridges in each scheme,while this partially counteracted between multiple bridges.The tidal prism decreased due to bridge piers,especially for the case of multiple bridges.
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