苏北大丰港海域航道临时抛泥区悬沙扩散影响研究

Study on the influence of suspended sediment diffusion in temporary sludge-throwing area of Jiangsu Dafeng sea waters

以大丰港航道临时抛泥区抛泥为研究对象,建立苏北辐射沙洲大丰港海域二维潮流泥沙数学模型,研究了航道临时抛泥区抛泥后的泥沙运移特征及对周边航道、锚地的影响。研究表明,在地形和边界的约束作用下,抛泥区的水质点运动具有明显的往复流特征,大潮涨落潮水质点轨迹存在一定的流路分歧;抛泥区抛泥后,高浓度含沙水体呈南北条状形态,轴线与航道基本平行;涨急和涨憩时刻抛泥,悬浮泥沙对航道具有一定的影响,而落急和落憩抛泥,悬浮泥沙对锚地影响相对较大。

A two-dimensional tidal current and sediment mathematical model of Dafeng sea waters is established to study the influence of suspended sediment diffusion in temporary sludge throwing area on surrounding waters.The trajectory of water particles in temporary sludge throwing area shows obvious reciprocating flow pattern.There are some divergences in the water particles of high tide and ebb tide,while the divergence in the water particles of low tide and ebb tide is smaller.After the sludge throwing,the high concentration sediment-laden water body is in the north-south strip shape,and its axis is basically parallel to the channel.It mainly affects the south and north sides of the sludge throwing area.The range of the envelope of the sediment increment is obviously larger at the two moments of maximum flood and flood slack,and has a slight influence on the channel.The maximum ebb and ebb slack sludge throwing has a greater impact on the existing anchorage,but has little influence on the channel.