南流江是广西沿岸流入北部湾的最长的河流。它现代河口由三条河流汊道(南干江,南西江和南东江)组成。南流江年径流量为52.53×10~8m~3;年平均悬沙输送量达116.9×10~4吨。各个汊道平均潮差为3.24m,最大4.5m。该河口外波浪作用以南西向为主。平均波高为O.2—O.4m。根据对该河口外的潮汐沙滩,河口沙坝的坡向以及水下三角洲的分析,笔者认为南流江河口具有典型的潮汐三角洲特征。 Nanliu River is the longest river flowing into Beibu Gulf along the Guangxi coast. Its modern estuary is composed of three rivers 汊 Road (South dry river, South River and South East River). The annual runoff of Nanliujiang River is 52.53 × 10 ~ 8m ~ 3. The annual average suspended sediment transport capacity reaches 116.9 × 10 ~ 4 tons. The average tidal range of each channel is 3.24m and the maximum is 4.5m. The estuarine wave is dominated by the southwest. The average wave height is O.2-O.4m. Based on the analysis of the tidal sand beach outside the estuary, the slope of the estuary sand bar and the underwater delta, the author thinks that the south stream estuary has typical tidal delta characteristics.