南海东部几种典型海底地貌特征的研究与认识

Research and cognition for several typical seabed features in the eastern of the South China Sea

近年在南海东部80~1500 m水深区进行了许多场址的工程物探调查项目,基于对这些项目侧扫声呐地貌资料的解释和研究,本文对研究区内的几种典型地貌特征进行了梳理和分析.研究区内海底地貌特征分布广泛、种类众多,其中常见的底质异常、沙波、海底光缆、硬质海底、崎岖地形与滑坡、断层等是研究区内具有代表性的典型地貌特征.本文目的是通过研究不同区块、不同类型的地貌特征,提高对海底地貌特征的认识,分析其对于海底工程活动可能存在的潜在危害和影响,有效提升地貌资料研究评价的准确性和可靠性,为以后在类似区域进行海底灾害地质研究提供参考和借鉴.

In recent years, many geophysical survey projects have been performed in 80~1500 m water depth area in the eastern of the South China Sea. Based on the side scan sonar data interpretation and research on these projects, the analysis has been made about several types of seabed features within the research area in this paper. Several typical of seabed features in the research area have been observed frequently, in order, the abnormal reflection, sand wave, optical cable, hard seabed sediment, rugged terrain and landslide, fault, and etc. The purpose of this paper is to improve the cognitive ability for seabed features by studying the different blocks and different types of seabed features, make an analysis of potential hazards for the seabed engineering activities, improve the accuracy and reliability of geomorphic research for seabed features, this could be used as a reference for the future submarine geology hazards interpretation in similar survey area.