Grain Size Distribution Patterns ofthe Rizhao Coast and Their Bearing on Coastal Erosion
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摘要:
通过对日照市海岸带2个重点沙滩的现场调查和沉积物粒度计算，综合分析了沙滩的侵蚀现状和粒度参数特征。海滨国家森林公园沙滩北部和南部处于侵蚀状态，中部为缓慢淤积状态；万平口海水浴场沙滩北部、中部总体呈侵蚀趋势，南部为淤积状态。海滨国家森林公园沙滩的平均粒径总体要小于万平口海水浴场沙滩，这与两沙滩的坡度不同有关，平均粒径从滩肩到低潮线逐渐变小。海滨国家森林公园沙滩的分选性要好于万平口海水浴场沙滩，分选系数具有由陆向海、由北向南逐渐变小的趋势。沙滩的滩肩和滩面处频率曲线主要为双峰，峰态平坦，物质来源复杂，低潮线处频率曲线主要为单峰，峰态尖锐，物质来源单一。
Abstract:Field survey and grain size analysis have been carried out for two beaches of the Rizhao coast to reveal the current status of beach erosion. It is found that both the northern and southern parts of the National Seaside Forest Park are under erosion, except the middle part which remains under weak siltation. On the Wanpingkou beach, however, the northern and middle parts are under erosion, except the southern part which is slightly under siltation. The mean grain size of the National Seaside Forest Park is smaller than that of the Wanpingkou, owing to the difference in slope angles of the two beaches. The mean grain size decreases gradually from beach berm to low tide level. The sorting of particle in the National Seasside Forest Park beach is better than that of Wanpingkou. The sorting coefficient becomes smaller from land to sea or from north to south. The frequency distribution of the beach berm and shore face are dominated by double peak curves with flaty kurtosis, indicating a rather complicated sediment source. However, the frequency curve in low tide level is mainly dominated by single peak with sharp kurtosis, indicating a simple sediment source.
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Key words:
- current status of coastal erosion /
- grain size analysis /
- beach /
- Rizhao coastal zone
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