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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算式的方法，得到海口湾现有（１９９０年）纳潮量为５．１４×１０￣７ｍ３，１９８４年为５．８０×１０７ｍ３，１９６５年为５．０５×１０￣７ｍ３，文中在分析了决定纳潮量的形态因子和潮差因子后，得出因海口湾形态因子变化而引起纳潮量变化的趋势在１９６５～１９８４年呈减小趋势，递减率为２×１０－３；１９８４～１９９０年呈增加趋势，递增率为１×１０－３．１９８４年前所以呈减小趋势的主要原因是海湾泥沙自然沉淤所致；１９８４年后由于海口港、海口新港进行疏浚，扩充港池等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, a method for the establishment of the nocturnal abundance formula was established. The current (1990) NIM of Haikou Bay was 5.14 × 10 ~ 7m 3 and 5.80 × 107m 3 in 1984 And 5.05 × 10-7m3 in 1965. After analyzing the form factor and tidal deviation factor of determining the amount of tide, the trend of the change of the amount of the tide caused by the change of the form factor of Haikou Bay was obtained from 1965 to 1984 The decreasing rate was 2 × 10-3, and the increasing trend from 1984 to 1990 was 1 × 10-3. The main reason for the decreasing trend before 1984 was the natural sedimentation of the Gulf Sediment Since 1984, the dredging of Haikou Port and Haikou New Port to increase the average basin area and so on resulted in an increase in the average low tide water area, which is the dominant factor causing the increase of the tidal volume.