日照石臼港人工岬湾海岸设计及稳定性研究

Study on the Design and Stability of Artificial Headland Bay Beaches in Shijiu Area of Rizhao, China

基于日照万平口海区三期水深地形调查资料、水动力及海底沉积物调查数据,研究了日照石臼港海域人工岬湾海滩建设前后波浪场的变化、沉积物在波浪作用下沿岸输运变化及海岸侵蚀冲淤特征,并模拟验证了人工沙滩建设后的平衡岸线,明确了不同长度防波堤建设后海滩的稳定性及其设计的合理性。结果表明:防波堤建设前研究区入射波浪与岸线有一定夹角,导致波浪作用下沉积物有由南向北输移的趋势;人工岬湾的建设可改变近岸波浪场,继而影响沿岸泥沙输运,对岸滩稳定有重要影响;海岸工程、波浪场及泥沙输运三者相互作用,是人工岬湾海岸稳定性的关键因素。

Based on three period morphology, hydrodynamic and sediment survey data, this study analyzed the characteristics of wave field, alongshore transportation and coastal erosion before and after building artificial headland beach in the Shijiu harbor area of Rizhao, forecasted the equilibrium shoreline of coast is, and indicated the rationality and stability of the artificial headland bay beaches after construction of different length of breakwaters. The results show that there is an angle between the direction of the dominant wave and the coastline in the study area before building the breakwater, which results in alongshore transportation from south to north. The artificial headland bay can change wave field, and further affect the balance of the alongshore sediment transportation, which has an important impact on the stability of beach. The interaction among coastal engineering, wave field and sediment transport is the key factor to the stability of the artificial headland bay.