Dynamic Navigable Water Depth Based On Continuous Depth Datum

Safety is the primary premise of shipping industry.Dynamic navigation service is the key element to ensure navigation safety.As the basis of navigation safety,the realtime updating of dynamic information is one of the most important research directions of navigation security.Water depth is the primary factor to be considered in navigation.The traditional navigation method of consulting the Tide Table and the water depth of the chart of the port is usually adopted.However,due to the disunity and discontinuity of the meaning of depth datum in China’s coastal ports,and the low real-time performance of tide level information in Tide Table,the traditional navigation means can not meet the needs of dynamic information service for ship navigation.This paper took the realization of dynamic bathymetric information service as the research core,and carried out experimental research from the perspective of multidisciplinary integration of physical oceanography,hydrographic survey and navigation:Firstly,aiming at the limited control range of tidal data provided by Tide Table,this paper provided an astronomical tidal level simulation method based on the FVCOM model and high-precision boundary conditions.Thus,a high resolution astronomical tide model which can meet the prediction accuracy requirements of Tide Table was built.The experimental results show that the simulation results of this model have high simulation accuracy for the area of concern.It can accurately reflect the tidal wave movement law in the area of concern,which provides an important foundation for the construction of dynamic bathymetric model.Then,in view of the discontinuity and disunity of the meaning of depth datum of various ports along the coast of China,a continuous depth datum model of the concerned area based on the physical properties of depth datum and geometric modeling method was constructed in this paper.The comparison results show that the depth datum has a high consistency with the physical meaning of the datum stipulated in the“Hydrographic Standards”.Afterwards,through the calibration of the datum model,the continuous datum model can be constructed without changing the usage of charts.Finally,according to the requirements of MSP 15 for “Real-time Hydrological and Environmental Information Service”,a dynamic water depth model based on residual water level correction method was constructed.Dynamic water level combination can be more complete with this method.This paper designed the customized dynamic information service for the navigation depth of ships from the micro and macro perspectives,which can expand the navigable time window of large ships in the port.In conclusion,the dynamic bathymetric model provided by the multidisciplinary field in this paper can meet the ship’s demand for precision and timeliness of dynamic information service.This model can also effectively change the existing static navigation mode and improve the water depth utilization efficiency of port channel.