摘要:
从海岸演变、沉积过程、动力条件、泥沙运移等多角度阐述了北戴河海滩养护区域自然环境条件。北戴河海岸属于岬湾沙质海岸,具备岬湾养滩的天然条件,发育多条断续分布的水下沙坝,原滩剖面为侵蚀性剖面;西海滩蚀退速率>2 m/a,属于严重侵蚀岸段;波浪的强浪向NNE和ENE,常浪向S,潮流为NE—SW向的往复流,沿岸泥沙净输沙方向为NE—SW向。洋河浅海泥沙中值粒径为0.31~0.58 mm,物化性质均符合养滩需求,为理想沙源。通过构建合适的人工岬头和离岸潜堤配合人工养滩可以恢复受蚀的海滩。
Abstract:
The environmental conditions of the Beidaihe beach, includeing its landforms, sediments, water dynamics and sediment transport, are discussed in this paper. The research shows that the coast of Beidaihe, as a sandy headland coast, is favorable for beach nourishment. There are several disconnected sandbars parallel to the coast. Beach profiles suggest that the coast is now under erosion. The rate of erosion is more than 2 m/a in the western beach. Strong waves occur in NNE, ENE direction, while the norml waves are in NS. The reciprocal tidal current moves in NE-SW direction. As the result, the net transport of sediments is in NE-SW. The mean grain size of the sediments dredged from the Yanghe river vary in a range of 0.31~0.58 mm with good physical and chemical properties. They could be used as an ideal source for nuourishment. Beach nourishment in combination with construaction of artificial headlands and offshore submerged breakwaters are recommended to protect the beach from erosion.
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