Research On Passing Capacity Of Channel Based On Ship Field

The demands of freight transport in the coastal areas has kept an increasing growth owing to the sustained and fast development of its hinterland economy,which,then,brings about the large scale constructions of coastal ports within the area.As the main channel for vessels,the channel of outside sea has become the key factor in supporting the hinterland economic development of the coastal areas port group.The busy traffic environment has become even worse due to the limitations by the military-restricted-area management on the two sides,the variations of the meteorological conditions and the adverse effects brought out by non-cargo vessels such as fishing boats,which will bring the increase in both the encounter rate of ships and risk-degree of the whole transport system.As a consequence,the navigation capacity has become the focus of the management department.First,this paper reviews the existing calculation formulas and influencing factors in the evaluation of the inland channel passing capacity.Then,some suitable and effective factors are studied and chosen according to the concrete conditions of the channel,including its open sea property.Second,this paper has studied the system of channel and how to define its border,combined with the traffic engineering theory,a ship-field model based on Fuji Theory and its revised form is built,furthermore,the calculation model of the outside sea channel passing capacity is built too.At last,according to the fact of outside sea,the paper bring out the method of define the model parameter such as the breadth of the channel.This paper chose Lao-Tie hill Channel as study object,which is one of the three outside sea channel of port group.Based on mass data selection and the practical investigation,this paper choses reasonable value for model parameter and influencing factors,then the calculation of the navigation capacity is carried out.Meanwhile,the cargo-passing capacity of the Lao-Tie hill Channel is calculated by predicting ship types in 2020～2030 and the actual load rate of different ships which are various in types and cargos.The paper bring out the prediction in macro-economy of the Circum of Bohai-Sea Region,and the freight demands and ship demands are also predicted through deducting the inter-communications of the coastal ports.Finally,after comprising the capacity and demand,assessments of the Channel's passing ability is carried out,meanwhile, advices and measures in increasing the ability are also presented.