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１９９７ 年冬季小潮期间，大面站和断面站观测结果说明，九龙江口存在着河水和海水交界的冲淡水锋面，该锋面落急时局限于河口湾内，涨急时扩展至湾口区水域。此外，退潮时河口冲淡水和厦门西港海水在湾口区形成另一水系锋面，其锋面对河口冲淡水和厦门西港海水的运移有重要作用。在冬季九龙江口ＳｉＯ２－３ 、ＮＯ－３ ＋ ＮＯ－２ 基本呈保守行为，它们的分布主要受控于高Ｓｉ、Ｎ 的河水和低Ｓｉ、Ｎ 海水的混合过程，其含量从河端朝海端呈递减趋势。ＰＯ３ －４ 有明显的缓冲现象，表现为非保守行为，其水平分布比较均匀。
During the winter tide in 1997, the observations at the Da-mei Station and the Segment Station show that there is a fresh-water front in the Jiulong River estuary at the junction of river and sea water. The front was limited to the estuary and extended to the mouth of the mouth of the bayou in case of emergency. In addition, at the ebb tidal level, the estuarine flushing water and the Xiamen Western Harbor sea water formed another front of the water system in the mouth of the mouth. Its front has an important role in the transport of estuary freshwater and the Xiamen Western Harbor. In winter, SiO2-3 and NO-3 + NO-2 in Jiulongjiang estuary basically behaved conservatively, and their distribution was mainly controlled by the mixing process of high Si, N and low Si and N seawater. Decreasing trend. PO3 -4 has a significant buffering phenomenon, showing non-conservative behavior, the horizontal distribution of more uniform.