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根据气侯材料选择最佳航线,即所谓气侯定线法,在缺少水文气象情报和预报的洋区以及预报时效不够的情况下,确有一定的效果;但在天气和海况复杂多变的地区应用这种方法选取最佳航线则困难颇多,效果并不甚理想。随着海洋资料情报增多、要素预报时效延长和预报精度的不断提高,越来越倾向于采用天气定线的方法,即根据未来天气情况确定最佳航线。在天气定线中应用最早的,首推基于图表计算的等时线法,其实质简述如下。 假定一具有技术速度V_0的船从A点出发,在无风和浪的情况下经过△t时间后,到达中心位于A、半径为V_0△t的圆弧上的某一点。但是,在大洋上航行的船处于各种水文气象条
Choosing the best route based on climatological data, the so-called climatic alignment method, does have some effect in the absence of hydrometeorological information and forecasts in the western part of China and in the case of insufficient forecasting timeliness. However, when the weather and sea conditions are complex and changeable This method of selecting the best route in this area is more difficult and less effective. With the increase of oceanographic information, the prolongation of the elemental forecasting time delay and the improvement of prediction accuracy, it is more and more inclined to adopt the method of weather alignment, that is, to determine the best route according to the future weather conditions. The earliest used in the weather alignment, the most important calculation based on the isochronous line method, its essence is summarized as follows. Suppose that a ship with a technology speed of V_0 starts at point A and after a time of Δt in the absence of wind and waves reaches a point on a circular arc centered on A with a radius of V_0Δt. However, ships sailing on the ocean are in various hydro-meteorological conditions