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辽东湾觉华岛附近海域海底地形地貌及沉积物分布特征分析
张建兴1, 宋永东2, 栾振东1, 杨立健3, 甘雨3, 阎军1
1.中国科学院海洋研究所;2.中国科学院海洋研究所,中科院海洋地质与环境重点实验室;3.中国科学院大学
摘要:
为对辽东湾觉华岛附近海域海底工程地质环境进行系统评估,利用高分辨海底声学探测设备获取调查海区的精密水深地形数据,利用筛析法、激光粒度仪实验法确定沉积物类型及粒度参数特征,最终综合分析得到研究区海底地形地貌及沉积物分布特征。研究发现,目标海域测量水深介于4~22m之间,平均水深15m左右,海底地形平坦,整体表现为平缓的近岸缓坡,地貌以近岸粉砂淤泥质浅滩地貌为主,局部发育微型海底沙波;海底浅地层第一声学反射界面清楚连续,可全区追踪,穿透深度0.5~5m不等,沉积物厚度相对稳定;表层沉积物中值粒径普遍较小,沉积物类型东区以粉砂和砂质粉砂为主,西区以砂质粉砂为主;表层沉积物组分和粒度参数的空间变化规律较为复杂,分析认为其主要受到沉积物物源以及辽东湾内往复流、沿岸流的影响。。
关键词:  海底地形地貌  沉积特征  辽东湾  觉华岛
DOI:10.11759/hykx20200301001
分类号:
基金项目:中国科学院知识创新项目
Analysis of the characteristics of submarine topography and the distribution of sediments near Juehua island, Liaodong bay
zhangjianxing,songyongdong,luanzhendong,yanglijian,ganyu,yanjun
1.Institution of Oceanology, Chinese Academy Sciences;2.University of Chinese Academy of Sciences
Abstract:
In order to evaluate the engineering geological environment of the seafloor near Juehua island in Liaodong bay, the high-resolution acoustic equipment was used to obtain the precise topographic data of the investigated sea area, and the sediment types and grain size parameters were analyzed by the sieve analysis method and the laser particle sizer experiment method. The topographic and sedimentary characteristics of the study area were obtained through comprehensive analysis. It is found that the measured water depth of the study area is between 4~22m, with an average water depth of about 15m. The topography of the sea floor is flat in general, and the topography of the sea floor is a gentle near shore slope, which is dominated by the near shore silty muddy shoal landform. Moreover the micro seabed sand waves are locally developed. The first acoustic reflection interface of shallow seabed is clear and continuous, which can be traced in the whole area. The penetration depth is about 0.5-5m, and the thickness of sediment is relatively stable.The average grain size of the surface sediments in the study area is generally small. The sediment types in the east area are mainly silt and sandy silt, while those in the west area are mainly sandy silt. Under the influence of the sedimentary provenance, reciprocating current and coastal current in Liaodong bay, the spatial variation rules of the components and grain size parameters are complex.
Key words:  submarine topography  sedimentary characteristics  Liaodong bay  Juehua island
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