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基床抛石是防波堤主体建设基槽施工中常采用的方法之一.运用经过实测资料验证的二维潮流、悬沙数学模型,研究枸杞岛防波堤工程施工期由于抛石引起的悬浮泥沙在水体中的扩散输移.针对基础建设海域附近水动力环境进行计算分析,根据不同潮时所布特征站位的流速分布制定4种抛石工况,预测评价不同抛石位置及不同工况下悬沙增量的扩散过程及区域,并计算各工况下悬浮泥沙增量最大影响范围.结果表明,为减小抛石引起的悬浮泥沙扩散范围,在确定抛石位置时,需结合以往经验选择流速较小的弱流区,考虑不同工程区域同时施工对悬浮泥沙增量可能产生的相互影响,并注意工程海区的潮流性质以及地形和岸线变化.计算结果可为防波堤施工期抛石位置的选择和工程环境影响评价提供科学依据.
The bedrock riprap is one of the methods commonly used in the construction of breakwater main groove.Based on the two-dimensional tidal current and suspended sediment mathematical model validated by the measured data, the study on the suspended sediment caused by riprap in the construction of the wolf island breakwater in the water body According to the calculation and analysis of the hydrodynamic environment near the foundation sea area, four kinds of riprap conditions are established according to the velocity distribution of the stations with different tidal characteristics, and the prediction and evaluation of different riprap locations and under different working conditions The increment of sediment increment and the area of sediment increment were calculated, and the maximum influence range of suspended sediment increment under each working condition was calculated.The results showed that in order to reduce the spread of suspended sediment caused by riprap, We should choose the weak flow area with small flow velocity and consider the possible interaction between the simultaneous construction of different projects and the increment of suspended sediment, and pay attention to the tidal current properties and the topography and coastline change in the engineering sea area. Provide the scientific basis for the selection of stone location and project environmental impact assessment.