Hydrodynamic Characteristics of Undular Tidal Bores in the Qiantang River Based on Field Observations

作     者：ZHANG Shu-yu PAN Cun-hong ZHANG Shen-yang LI Ruo-hua CHENG Wenlong XIE Dong-feng ZHANG Shu-yu;PAN Cun-hong;ZHANG Shen-yang;LI Ruo-hua;CHENG Wen-long;XIE Dong-feng

作者机构：Zhejiang Tongji Vocational College of Science and TechnologyHangzhou 311231China Zhejiang Institute of Hydraulics and EstuaryHangzhou 310020China 

出 版 物：《China Ocean Engineering》 (中国海洋工程（英文版）)

年 卷 期：2024年第38卷第3期

页      面：505-518页

核心收录：

学科分类：08[工学] 0816[工学-测绘科学与技术] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.42276176) the Joint Funds of the Zhejiang Provincial Natural Science Foundation of China(Grant No.LZJWZ23E090006) the Science and Technology Project of Zhejiang Provincial Department of Water Resources(Grant No.RC2233) the Key Project of Zhejiang Provincial Natural Science Foundation(Grant No.LZJWZ23E090003) the Joint Funds of the Zhejiang Provincial Natural Science Foundation of China(Grant No.LZJWY24E090002) 

主　　题：tidal bores Qiantang Estuary tidal bore height tidal bore velocity propagation speed 

摘      要：Understanding the undular tidal bores in the Qiantang River is essential for effective river management and *** breaking tidal bores have been studied extensively, reports on undular tidal bores in the Qiantang Riverremain limited. Furthermore, observed data on undular tidal bores fulfilling the requirements of short measurementtime intervals, and spring, medium, and neap tide coverage, and providing detailed data for the global vertical stratificationof flow velocity are quite limited. Based on field observations at Qige in the Qiantang estuary, we analyzedthe characteristics of undular tidal bores. The results showed that the flooding amplitude (a) of the first wave isalways larger than its ebbing amplitude (b). Moreover, the vertical distribution of the maximum flood velocity exhibitesthree shapes, influenced by the tidal range, while that of the maximum ebb velocity exhibites a single shape. Duringthe initial phase of the flood tide in the spring and medium tides, the upper water body experiences multiple oscillatingchanges along the flow direction, corresponding to the alternating process of the crest and trough of the tide levelupon the arrival of the tidal bore. The tidal range is a crucial parameter in tidal bore hydrodynamics. By establishingthe relationship between hydrodynamic parameters and tidal range, other hydrodynamic parameters, such as the tidalbore height, maximum flood depth–averaged velocity, maximum flood stratified velocity at the measurement points,and duration of the flood tide current, can be effectively predicted, thereby providing an important reference for rivermanagement and maintenance.