南京大学学报(自然科学版) ›› 2014, Vol. 50 ›› Issue (5): 656665.
王文昊1高抒1*,徐杨佩云徐琦琳1,2,赵秧秧1,2
Wang Wenhao1, Gao Shu1,2, Xu Yangpeiyun1, Xu Qilin1, Yu Qian1,2, Zhao Yangyang1,2
摘要: 来自岸外辐射沙脊群和废黄河口的细颗粒沉积物供给使江苏中部海岸潮滩快速淤长,其潮间带沉积速率以1-5 cm/a为特征值。针对该特征值的控制机理问题,本文以王港潮滩为原型,用数值实验方法重现了滩面悬沙输运格局,通过沉积连续方程模拟了海岸剖面上沉积速率的分布特征。结果表明细颗粒物质在潮间带上部强烈堆积,在给定的模拟条件下,最大沉积速率值与上述特征值相当;潮滩沉积速率随岸外水体悬沙浓度的降低而降低,“由淤转冲”的临界悬沙浓度值约为0.4 kg/m3,这表明若沉积物供应下降至一定水平,潮滩剖面将不能维持稳定。模拟结果显示,虽然目前江苏中部海岸潮滩呈淤长状态,但未来将面临因物源匮乏而转为侵蚀的风险,这对于海岸防护和生态系统保护是一个新的挑战。
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