Behavior-oriented calculation of the annual coastal bathymetry evolution caused by a reclamation work
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Behavior-oriented calculation of the annual coastal bathymetry evolution caused by a reclamation work ZHENG Jinhai1, 2, HOANG Quoc Xuyen1, 2, ZHANG Chi1, 2*, CHEN Kefeng3, DONG Xiaowei4, LEI Gang5, WANG Yigang2 1 State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098,
China 2 College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China 3 Nanjing Hydraulic Research Institute, Nanjing 210024, China 4 China Harbour Engineering Company, Beijing 100027, China 5 Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
Received 3 December 2016; accepted 10 January 2017 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2017
Abstract
A behavior-oriented formula is improved to calculate the annual coastal bathymetry evolution caused by a reclamation work. This formula is based on a simple hypothesis that, on the time scale of years, the bathymetry evolution is closely related to the change of tidal current field due to the reclamation work. A new coefficient, named the erosion reduction coefficient, is introduced to extend the original formula for applications in calculating bed erosion. A simplified relationship between the annual variation of the siltation/erosion rate and the water depth is introduced to more realistically represent the long-term process of the bathymetry evolution. The improved formula is applied to calculate the bathymetry evolution in 3 a following a reclamation project in the Xiaomiaohong Tidal Channel in Jiangsu coast in China. The results compare well with measurements and those obtained from a process-based numerical model, demonstrating the capability of the improved behaviororiented formula in reproducing the impact of the reclamation project on the local bathymetry evolution. Key words: coastal evolution, behavior-oriented formula, reclamation, numerical simulation Citation: Zheng Jinhai, Hoang Quoc Xuyen, Zhang Chi, Chen Kefeng, Dong Xiaowei, Lei Gang, Wang Yigang. 2017. Behavior-oriented calculation of the annual coastal bathymetry evolution caused by a reclamation work. Acta Oceanologica Sinica, 36(11): 86–93, doi: 10.1007/s13131-017-1139-3
1 Introduction Coastal reclamation works, while very efficient in increasing land resources, can change the natural shoreline and modify hydrodynamics and sediment transport processes. Consequently, the local bathymetry will evolve and re-adapt to the new morphodynamic forcing on a time scale varying from months to years. The evolution of bathymetry following land reclamation is of great concern in coastal engineering since it may affect many aspects, including structure stability, harbor safety, beach protection and local environment. Over the past decades, various approaches have been developed to quantify the bathymetry evolution caused by extreme natural events (e.g., storms) and human activities (e.g., reclamation, dredging). These approaches may be generally classified into two groups, which are referred to a
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