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1998年 11月 6～ 7日在九龙江河口湾鸡屿北侧沙洲进行了彩沙示踪试验研究 ,取得沙洲底沙运动数据 :(1)两个主要运动方向及其最大运移速度为 :NW向 6 1m/d ,SW向 32m/d。 (2 )一个全潮周日的最大扩散范围为 :NW SE向 74m ,SW NE向 42m ,垂直扩散深度 3cm左右。 (3)底沙运动过程中粗粒沙滞留在沙洲 ,细粒沙被搬走。 (4 )垂直鸡屿北岸的断面净输沙率为朝NW方向 717t/d。证实了鸡屿北侧沿岸存在着一股反向 (朝NW向 )输移的泥沙流 ,这一反向输沙是由往复潮流中涨潮流占优势和偏东向波成沿岸流的耦合作用所造成 ,从而造成河口湾北侧湾口海区的底沙年内变化呈顺时针方向旋回运动的势态。底沙向E(正向 )运动及河流洪水冲刷所致 ,结果导致海区东部浅滩区大量泥沙堆积。各水道水流交汇、偏东向波浪以及涨潮流占为优势的水动力环境使浅滩区底沙先向SW迁移 ,继而平行鸡屿北岸向NW迁移 ,最终沉积于鸡屿NW海底。一旦发洪水 ,又周而复始向E运动
Sand tracing experiments were conducted on the sandbanks on the northern side of Jiji Island, Jiulongjiang River from November 6 to November 7, 1998 to obtain sandy bottom sediment movement data: (1) The two main directions of movement and the maximum migration velocity were : NW to 6 1m / d, SW to 32m / d. (2) The maximum extent of a full tidal week is as follows: NW SE is 74m, SW NE is 42m, and vertical diffusion depth is about 3cm. (3) During the sediment movement, the coarse sand stays in the sandbar, and the fine sand is removed. (4) The net sediment transport rate at the cross-section of the north shore of Vertical Chicken Island is 717t / d in NW direction. It is confirmed that there is a reverse (NW) transport of sediment flow along the northern coast of Jili. This reverse sediment transport is caused by the coupling of upward tidal current in tidal current and coastal wave in east-easterly wave Caused by the action, resulting in changes in the sediment of the bottom of the bayou in the north of estuary estuary in the clockwise direction of the cyclical movement. Sediment movement to the E (forward) and floodwaters caused a large amount of sediment accumulation in the eastern shoal of the sea. The hydrodynamic environment with the intersection of the water flow of each channel, the easterly wave and the tidal current flow makes the sediment of the shoals move first to the SW and then migrate parallel to the north shore of the Jimao island to the NW and finally deposit on the seabed of the Jyu Island NW. Once the flood, again and again to E movement