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通过从遥感影像中提取的水域面积，结合潮汐资料建立纳潮量其式的方法，得到海口港1990年纳潮量为2．57×107m3，1984年为294×107m3，1965年为2．62×107m3。分析了决定纳期量的形态因子和潮差因子后，得出因海口港形态因子变化而引起纳潮量变化的趋势为：1965～1984年呈减小趋势，递减率为50×10－3；1984～1990年呈增加趋势，递增率为4．8×10－3。1984年前呈减小趋势的主要原因是海港泥沙自然淤积所致；1984年后对海口港进行疏浚，扩充港池，使平均低潮水域面积增加，是引起纳潮量增加的主导因素。
Based on the watershed extracted from the remote sensing images and the tide data, the method of nocturnal concentration was established, and the nocturnal absorption of Haikou Port was 2.57 × 107m3 in 1990 and 294 × 107m3 in 1984, and 2.62 × 107m3. After analyzing the form factor and tidal deviation factor of the staged NAP, the trend of the change of the tidal volume caused by the change of the form factor of Haikou Port is that the decreasing trend is from 1965 to 1984, and the decreasing rate is 50 × 10-3 From 1984 to 1990. The increase rate was 4. 8 × 10 -3. The main reason for the decreasing trend before 1984 was the natural siltation of the harbor silt. After 1984, the port of Haikou was dredged and the harbor was expanded Pool, the average low tide area increased, is the main factor that causes the increase of the tide.