南黄海灾害地质及地质环境演变

利用浅地层剖面、卫星遥感及钻孔资料,研究了南黄海灾害地质类型及其分布,编制了南黄海灾害地质图。南黄海灾害地质类型很多,包括活断层、地震、海岸侵蚀、海岸淤积、沙波、现代潮流沙脊、古潮流沙脊、水下三角洲、古三角洲、古河道、浅层气、埋藏古河道、埋藏古三角洲和埋藏古湖沼洼地等。它们的分布范围很大,特别是在122.5°E以西的海域和海岸带地区,海洋灾害地质类型分布密集。晚更新世以来黄海地区发生了3次大规模海进,3次海进之间还经历了两次较大规模的海退成陆过程,这些过程决定了南黄海海域复杂的海洋灾害地质类型及分布。南黄海众多的灾害地质问题将会对海底工程建设安全构成很大威胁,应该引起高度重视。

HAZARDOUS GEOLOGY AND MARINE GEOLOGIC ENVIRONMENTAL EVOLUTION IN THE SOUTH YELLOW SEA

High-resolution seismic data, satellite remote sensing and boring data have been used to examine marine hazardous geologic types and their distribution in the South Yellow Sea. Hazardous geologic map of the South Yellow Sea has been completed. Hazardous geologic types are multiple in the South Yellow Sea, including active fault, earthquake, coastal erosion, coastal accumulation, sand wave, modern tidal sand ridge, palaeo-tidal sand ridge, undersea delta, palaeo-delta, palaeochannel, shallow gas, buried paleochannel, buried palaeo-delta and buried palaeo-lake. The scale of distribution of hazardous geologic types is large. In the sea and coastal area to the west of 122.5°, the types of hazardous geology are much more, and distributed in almost the whole area. Geologic environmental evolution since late Pleistocene decides the formation and regularity of geologic hazards. Three large-scale transgressions happened in the Yellow Sea since late Pleistocene, with two small-scale regressions in between. These processes caused complex marine hazardous geologic types and their distributions. Severe hazardous geologic phenomena will greatly threaten engineering construction and sea bottom stability.We should pay more attention to it.