崎头洋海砂开采对朱家尖沿岸沙滩的影响

Effect of exploiting sand in the Qitou Estuary on the Zhujiajian's barrier beach

采用三角形单元法建立了崎头洋采砂作业区局部平面二维潮流数学模型,潮位、流速、流向和水流运动形态的验证结果与天然海域状况基本一致,在此基础上,对朱家尖东侧沙滩沙子流失现象的成因和机理进行了深入的探讨。研究结果认为:崎头洋采砂工程前后引起的潮流流场变化仅限于工程区本身及其附近区域,对大范围海域的流态没有影响;朱家尖东侧沙滩沙子流失的原因乃是由波浪入射近岸浅水域破碎后掀沙,斜向破波产生沿岸流,潮流和沿岸流共同挟带泥沙输移所致。同时出于保护环境和资源的角度,建议严格控制采砂规模。

This paper presents 2D tidal model with the finite triangle elements in Qitou Estuary sand-exploiting zone. The verified result of tide level, velocity, direction meets the nice natural sea conditions. The conclusions were following from the research： the change of current field before and after exploiting sand from Qitou Estuary bed only exist in the construction region and nearby. The sand transport in the eastern beach of Zhujiajian was a result of tidal current and longshore current＇s movement together. The latter was caused by the action of wave-breaking in the surf zone along shore. It is proposed that it should control the sand-exploiting strictly for protect the environment resources.