基于船舶通航安全所需水深和潮汐特征,提出实际乘潮时间和乘潮富裕时间等概念,并根据水域潮汐情况计算一定乘潮保证率下船舶乘潮通航时间,从而确定该保证率下乘潮大船的通航能力,计算出包括不需乘潮船舶在内的所有船舶的通过能力.采用天津大沽沙航道相关数据对计算模型进行验证,结果表明计算具有较高的可信度. Based on the water depth and tidal characteristics required for navigational safety, the concepts of actual time of influx of tide and time of rich tide are put forward. Based on the tidal conditions of the waters, the tide time of the tide at certain tidal range is calculated to determine the tidal current under the guaranteed rate The navigational ability of large ships was calculated to calculate the passing ability of all ships, including those not required to ride the tide ships. The calculation model was verified by using the data from the Tianjin Dagucha fairway and the results showed that the calculation had high credibility.