关于淤泥质海岸与粉沙质海岸界定的探讨

对以往淤泥质海岸和粉沙质海岸的界定方法进行了回顾和剖析,指出了其中的不足。并根据前人大量试验结果和现场资料,从泥沙粒径、絮凝因子、起动流速、含泥量等因素,结合欧美国家和我国海洋调查规范对泥沙的分类,将泥沙d50<0.016 mm,含泥量大于25%的海岸视为淤泥质海岸;0.016 mm≤d50≤0.12 mm,含泥量小于或等于25%的海岸视为粉沙质海岸,这种海岸的分类不仅与众多泥沙研究成果总体一致,而且包涵了海岸泥沙运动、港口淤积及清淤等组合因素,更贴近于港口工程实际。

Study on definition of muddy coast and silty coast

By review and analyses the former definition of muddy coast and silty coast,the deficiencies is pointed out in this paper.Based on massive test result and surveyed data,the particle size,flocculation factor,incipient motion speed,clay content,etc are comprehensively analyzed,and combined with silt classification in European-American Nation and Specification for Oceanographic Survey of China,defined the seacoast which particle size less than 0.016 mm and clay content greater than 25% as the muddy coast,which the median particle diameter between 0.016 mm and 0.12 mm and the clay content less than or equal to 25% as silty coast.The classification of seacoast is consistent with massive silt research result,and more close to the silt fact of harbor project for includes combination factors of silt movement,harbor deposition and silt clearance.