A PRELIMINARY STUDY ON HAZARDOUS GEOLOGY IN THE BOHAI STRAIT
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摘要: 渤海海峡是黄渤海物质交换的通道,地质环境复杂,存在多种灾害地质因素。通过高分辨率浅地层剖面资料精细解译,结合前人研究成果,系统研究了渤海海峡海域的主要灾害地质的分布规律及其与环境演变的关系。研究表明,渤海海峡海域灾害地质类型复杂多样,包括潮流沙脊、潮流冲刷槽、浅层气、埋藏古河道、活动断层、不规则基岩等,它们在分布和成因上既有区别又有联系。晚更新世以来的渤海海峡海域的构造运动与"海侵-海退-海侵-海退-高水位"的沉积环境演变,共同决定了该区域海洋灾害地质的发生与发展。研究圈定了海底灾害地质类型及浅埋藏灾害地质类型的分布规律,对渤海海峡海域未来的工程建设和防灾减灾提供了理论基础。Abstract: The Bohai Strait, a water-sediment exchange channel between the Bohai Sea and the Yellow Sea, is rather complicated in geological environment, and there bear various geohazardous factors. High-resolution seismic data and previous research products are used in this paper to identify the types of marine geohazards and their distribution. The main types of geohazards in the Bohai Strait include the tidal sand ridge, tidal erosion gutter, shallow gas, buried paleo-channel, active fault, irregular bedrock topography and so on. There are both differences and connections in the distribution and origin of those hazards. Tectonic movements and river-sea interaction since late Pleistocene are the main factors, which may influence the genesis and development of geohazards in the Strait. The hazardous geological maps of the study area, which are completed recently, will provide a basis for engineering construction, disaster prevention and mitigation.
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Key words:
- the Bohai Strait /
- hazardous geology /
- environment evolution /
- shallow seismic data
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