临海工程建设对厦门北面海域底质粒级组成的影响

Influence on sediment grain size composition in northern Xiamen waters from coastal engineering construction

本文根据1980年厦门港湾底质调查的70个样品,应用R型因子分析方法,对沉积物粒级组成的成因进行分析。结果表明,该海域陆续修建的临海工程对其沉积物组成影响明显,使其由粗粒组成向细粒组成变化。尤其是高集海堤的兴建,泥沙大量淤积;海堤建成后,沉积环境日益稳定,接受沉积物以粉砂、粘土占主导地位。

R-mode factor analysis is carried out on sediment grain size compositions in northern Xiamen waters. The sediments can be divided into seven grain size construction size constituents by their hydrodynamical characters.The results show that the cosatal engineering construction which were completed one by one in the past years have exerted distinct impacts on the sediments in the northern Xiamen waters. The main constituents have changed from coarse to fine. Especially, the construction of the Gaoqi-Jimei Causeway has caused the settlement of large amounts of detrital materials. Since its construction, the sedimentary environment in the northern Xiamen waters has turned stable gradually and caused the domination of silt and mud due to the hydrodynamical weakening.