物理模型试验在确定挡沙堤布置中的应用

Application of Physical Model Experiment to Determine Sand-barrier Layout

港口工程建设中经常采用挡沙堤防止工程功能区内产生明显的淤积,挡沙堤的平面布置及高程设计直接决定了其是否满足功能区的淤积要求,通过潮流物理模型试验可以直观地识别出泥沙输移路径及强输沙潮流所对应的瞬时潮位,泥沙输移路径可以决定挡沙堤的平面布置形式,强输沙潮流对应的瞬时潮位可以确定挡沙堤的堤面高程。根据实际工程的潮流、泥沙物理模型试验结果,论述了物理模型试验对挡沙堤布置方案设计的指导意义,试验结果显示,采用了相应的防淤措施使功能区内的淤积量明显减少,该方法对于海岸工程的防淤治淤具有一定的参考价值。

Sand-barrier is frequently used in harbour engineerings and coustructions to protect the functioning area from significant sand-deposition.The plane layout and the design elevation of a sand-barrier are crucial to meet the requirements of the funtioning area protected from the deposition.By means of physical model experiment for studying tidal current,the sand-transport paths and the instantaneous tidal level corresponding to the strongest sand-transport current can be ovbviously identified.The paths are for determination of the sand-barrier layout formation.The instantaneous tidal-level is for determination of the sand-barrier elevation.Based on the experimental results from a physical model for tidal current and sand tramsport,the instructive significance of the physical model experiment is discussed for the sand-barrier layout design.It is also learnt from the experimental results that the deposit amount becomes obviously decreased in the functioning area after the correlated measures against the sand deposition have been adopted.This model experiment method might have its reference to sand-deposition prevention and treatment in other coastal engineerings.