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根据广东省沿海及珠江三角洲口门区17个验潮站资料，分析近40a（1955—1994年）平均相对海平面（RSL）变化特点，表明RSL存在振幅20—40cm的准同步变化和1.5—2．0mm·a－1上升率。广东沿海的RSL长期变化存在30—40a、振幅2—3cm的气候周期。珠江三角洲口门区的RSL变化深受珠江径流量变化的影响。径流量变化1000亿m3，各分流口门的年平均水位相应变化4—6cm。
According to the data of 17 tide gauge stations in the coastal areas and the Pearl River Delta of Guangdong Province, the average relative sea level (RSL) changes of the past 40 years (1955-1994) are analyzed. The results show that the RSL has quasi-synchronous amplitude of 20-40cm and 1.5- 2.0mm · a-1 rate of rise. Long-term changes in RSL along the coast of Guangdong exist 30-40a, the amplitude of 2-3cm climate cycle. The change of RSL in the mouth area of the Pearl River Delta is greatly influenced by the runoff of the Pearl River. The change of runoff is 100 billion m3, and the annual average water level of each diversion port changes 4-6cm correspondingly.