Study On Through Capacity Of Coastal Fairway

With the construction of large deepwater berths in seaport, grade, scale and navigation conditions of the matched fairway have gradually become the restrictive factors of port development. Calculation of fairway through capacity and selection of fairway’s line number will be the key to determine fairway’s extension time. Scientific determination of fairway through capacity is a crucial basis for fairway’s planning and design, determining the construction scale of fairway and implementing its expansion.Combining the characteristics of coastal fairway, this research defines fairway through capacity in seaport as measured by service level of port.On the basis of system analysis of attributes as ships, fairway, berths, anchorage, natural conditions and so on, this research clarifies the key elements and their relations of ship sailing and operating system from the system perspective. Then a simulation model of fairway through capacity is established and most representative values are chosen as its parameters under ideal conditions. By running the model, the relation curving between service level of port and fairway through capacity under different navigation duration and tidal range in each specialized port area can be obtained. Meanwhile, we use reinforcement learning method and data mining technology to improve formula discovery from data (FDD), design formula discovery model based on Q-learning, and present a computational formula of fairway through capacity in seaport. The formula’s dependability is verified by evaluating its effect from the viewpoint of mean error, goodness of fit and graphic visualization.To accurately reflect fairway’s actual service state and analyze the influence mechanism of composing factors of marine operation system on fairway through capacity, modified formulas of fairway through capacity in seaport are proposed in this research. On the basis of discussing the effects of model’s parameters on fairway through capacity under ideal conditions, the influence coefficients of safety interval, tidal type, other natural conditions are presented. At the end of the dissertation, method of determining the best time to enlarge the fairway in the development of port area construction is also proposed through analysis of some examples.From all above, this study systematically puts forward the computing method of fairway through capacity, which can be applied to the planning and design of coastal fairway and provide a quantitative basis for decision making.