琼州海峡东侧铺前湾海域海底表层及浅部地层稳定性分析

Analysis of the Seabed Superficial Layer and Shallow Geological Strata Stability in the Puqian Bay Area on the East Side of the Qiongzhou Strait

为开展铺前湾及其相邻海域海底稳定性分析,利用侧扫声纳设备及高分辨率单道地震设备对研究区开展地形地貌及海底地层深部结构调查,获得了铺前湾及其相邻海域的侧扫声纳影像及海底深部结构解译图像。在研究区发现海底存在活动沙波、陡坎、侵蚀沟槽等微地貌单元,并发现研究区存在五类地质异常体,包括浅层气、不规则浅埋基岩、裸露基岩、潮流沙脊和海底陡坎。该海域的海洋工程可能遭受相关地质灾害的危害。并据此将研究区海域划分为3个不同的海底稳定性区:I) 如意岛南侧浅层气区;II) 如意岛北侧沙波区;III) 如意岛东侧基岩区。这些资料的分析,为该海域海底稳定性提供了基础资料,为该海域海洋工程的实施提供了技术支撑。

In order to analyze the submarine stability of the Puqian Bay and its adjacent sea areas, the side-scan sonar images and the interpretation images of the seabed deep structures of the Puqian Bay and its adjacent sea areas were obtained by using the side-scan sonar equipment and high-resolution single-channel seismic equipment to carry out topographic and geomorphic survey of the study area and the deep structure of the seabed. In the study area, it is found that there are active sand wave, scarp, eroded trench and other microgeomorphic units on the seabed, and there are five types of geological anomalies in the study area, including shallow gas, irregular shallow buried bedrock, exposed bed-rock, tidal sand ridge and submarine scarp. Marine engineering in this area may suffer from related geological hazards. On this basis, the sea area of the study area is divided into three different seabed stability areas: I) Shallow gas area on the south side of Ruyi Island;II) Sand wave on the north of Ruyi Island;III) Bedrock area on the east side of Ruyi Island. The analysis of these data provides basic data for the evaluation of submarine stability in this sea area and technical support for the implementation of marine engineering in this sea area.