FACTORS OF GEO-HAZARDS IN THE MODERN YELLOW RIVER SUBAQUEOUS DELTA
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摘要: 利用浅地层剖面、旁扫声纳剖面及测深资料对现代黄河水下三角洲的地质灾害现象进行了研究,发现三角洲不同的形成时期对应发育不同的地质灾害现象:①在现行河口地区,高浓度泥沙下潜海底形成了黄河口独特的浊流现象,河口泥沙的快速堆积和欠固结导致河口三角洲叶瓣以台阶状滑塌陡坎的形式向海尖灭;②由于河口物源断绝和受到冬季北风或偏北风作用,海底滑坡、冲蚀构造等大型地质灾害现象在老河口废弃三角洲叶瓣北侧大量发育;③埕北地区与孤东地区情况较为相似,经过长时间改造之后多种灾害地质现象大量分布,且在水深5~10 m的三角洲陡坡上最为发育。Abstract: Subbottom profile, side-scan sonar and precise depth recorder have been used to classify the factors of geo-hazards in the modern Yellow River delta. The analysis result suggests that there are different geo-hazard factors during different periods of development of the Yellow River delta:(1)In the present estuarine area, the submergence of the high silt concentration forms the unique phenomenon of turbidity current in the Yellow River mouth. Because of the rapid sedimentation and un-consolidation of the silt in the estuary, the lobes of the Yellow River delta splinter towards the ocean in the form of slump step.(2)There are a lot of seabed landslides and erosion structures in the north of the abandoned delta lobe, because sediment input of the estuary is in discontinuity and due to the influence of north wind in winter. (3)The situations in Chengbei area are similar to those in Gudong area.After a long-time reworking, various geo-hazards are found in these two areas, especially in the delta slope where water is 5~8 m deep.
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Key words:
- geo-hazards /
- seabed landslides /
- turbidity current /
- Yellow River delta
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