摘要
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.
One of the methods to conduct base foundation in common use is bed riprapping when the break- water is constructed. A planar 2D mathematical model for dispersion-transportation of tide and suspended sediment, which is verified by measured data, is established and applied to simulate the dispersion--trans- portation of suspended sediment of Oouqi Island during the construction period of the breakwater. Accord- ing to the analysis of hydrodynamic environment in base-foundation sea area and the distribution of velocity at characteristic station during each tide period, four working conditions are arranged; and the diffusion ar- ea in different working condition is forecast and evaluated. For the reduction of spreading range, the result indicates that the interaction effect among adjacent construction zones should be considered, as well as the weak flow features. Additionally, the tidal currents and shoreline dynamic changes are also significant fac- tors. By concluding the largest influence area, a better position for riprapping can be chosen. The results will benefit the environmental impact assessment of engineering.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2015年第1期1-6,共6页
Engineering Journal of Wuhan University
基金
国家自然科学基金项目(编号:41276017)
国家海洋局公益项目(编号:201205005-2)
关键词
悬沙增量
抛石
扩散输移
影响范围
increased suspended sediment
riprap
dispersion and transportation
influence area
