苏北吕四小庙洪水道建港可行性的沉积学分析

Sedimentation Analysis of the Feasibility of Harbour Construction in Xiaomiao,Lsi

本文根据小庙洪水道和邻近浅滩区钻孔岩芯与地貌特征的观察,以及孢粉、磁化率和^(14)C年代测定资料的综合分析,认为小庙洪水道区的槽谷形态最早形成于晚更新世末期,现代的潮汐深槽主要形成于距今1200年以来,是因古长江水流及其迁移的作用,由水下泄流汊道经潮汐水道演化而来的。目前水道处于冲刷状态,冲刷程度呈现减弱趋势,是一个深而渐趋稳定的潮道,有利于港口的建设。

Based on the analysis of lithological characteristics,pollen and spore,magnetic susceptibility and 14C data, it is found that the landform foundation of the offshore beach and the trough in L(?)si was established in the late Pleistocene. The landform nowadays has obvious inheritance. Since about 1200 years ago,the underwater waterway has gradually developed into the present trough affected by the flow of the Yangtze River and its shift. The present waterway is a deep and gradually stable tidal trough, which is proved to be favourable for a large harbour.