磨刀门河口沉积物粒度特征与沉积环境

磨刀门河口的发育深受地质构造和动力条件的制约，在河流和海洋的相互作用下，形成了复杂的沉积特征。根据磨刀门河口表层沉积物的粒度分析结果，运用数学地质方法对粒度参数进行多元统计对应分析，并在此基础上结合地貌和动力条件，分析河口的沉积物粒度特征及其动力沉积环境。结果表明，河口表层沉积物主要有粉砂质粘土、粘土质粉砂、极细砂、细砂等类型；沉积环境可划分为河口主槽沉积环境、涨潮流沉积环境、浅滩沉积环境、拦门沙坝沉积环境及河口前缘沉积环境。

CHARACTERISTICS OF THE SEDIMENT AND SEDIMENTARY ENVIRONMENT IN THE MODAOMEN ESTUARY

The development of the Modaomen Estuary is greatly controlled by the geologic structure and hydrodynamic factors. The interaction between river and ocean forms the complex sediment characteristics. Based on the analytic result of granularity of surficial sediment samples in the Modaomen Estuary, combined with physiognomy and hydrodynamic conditions, in this paper the multi-element corresponding analysis of mathematic geological method is applied to reveal the characteristics of the sediment and sedimentary environment of the Modaomen Estuary. The results indicate that the sediment is dominated by fine sand, silt, clay, clayey silt and silty clay. The dynamic sediment environment is divided into different areas that consist of estuarine deep trough, flood current, Jiaobeisha shoal, estuarine sandbar and seashore outside estuary.