【摘要】 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。更多还原

【Abstract】 Based on the data obtained from the survey stations and sectional stations at a neap tide in the winter of 1997, it shows that a plume water fronts between the freshwater and seawater exists inside Jiulongjiang Estuary. This front was located in the inner estuary at ebb fast tide, and spreads to the outer estuary at flood fast tide. Besides, at ebb fast tide in the outer estuary there was a water front due to the merging of the plume water in the inner estuary and seawater from West Xiamen Harbour. This front plays an important role in the transportation of the plume water and seawater from West Xiamen Harbour. Both of SiO 2- 3 and NO - 3+NO - 2were quite conservative in winter, their distribution was principally determined by the mixing process between the freshwater of high Si, N and the seawater of low Si, N content, leading to a gradual decrease of Si, N concentration seaward in the estuarine region. PO 3- 4 was non conservative owing to buffer mechanism, its horizontal distribution doesn’t vary greatly.更多还原