福建罗源湾南部沉积物的工程地质特征

发布时间：2018-04-27 17:27

本文选题：罗源湾 + 沉积物　；参考：《海洋科学进展》2016年01期

【摘要】：结合可门港建设中获取的实测资料,研究了福建罗源湾南部海底的地形地貌特征和沉积物的工程性质。研究发现,罗源湾海底存在3个地形分区,即浅滩区、斜坡区和深水区;不同地貌区的海底淤泥的厚度整体上与水深有一定关系,浅滩区淤泥厚度整体上随水深的增大而增大,而在斜坡区和深水区,却恰好相反;研究区淤泥的含水量较高(平均为65.4%),孔隙比较大(平均为1.8),具有明显的高含水量、高孔隙比、高灵敏度、低渗透性、低强度、低重度的工程地质特征;研究了罗源湾南部沉积物的沉积和运移的一种模式,发现岸边侵蚀的土体主要沉积在离岸约1 000m的范围内,而土体的二次侵蚀、滑坡或重力流均可造成沉积物的再次运移与沉积。
[Abstract]:Based on the measured data obtained from the construction of Cormen Port, the topographic and geomorphological characteristics of the seabed and the engineering properties of sediments in the south of Luoyuan Bay, Fujian Province are studied. It is found that there are three topographic zones on the bottom of Luoyuan Bay, that is, shoal area, slope area and deep water area, the thickness of seabed silt in different geomorphologic areas is related to the depth of water, and the thickness of silt in shoal area increases with the increase of water depth. On the other hand, in the slope and deep water areas, the water content of the silt in the study area is higher (65.4% on average, the porosity is larger (1.8% on average), and it has obvious high water content, high porosity ratio, high sensitivity, low permeability, low strength, high water content, high porosity, high sensitivity, low permeability and low strength. A model of sediment deposition and migration in the southern part of Luoyuan Bay is studied. It is found that the seashore eroded soil is mainly deposited in the range of about 1000 m offshore, while the secondary erosion of the soil is found. Landslide or gravity flow can cause remigration and deposition of sediment.
【作者单位】：国家海洋局第三海洋研究所;中国海洋大学海洋地球科学学院;
【基金】：国家自然科学基金项目——海岸湿地台风沉积记录形成的环境动力学机制及保存潜力(41076035)
【分类号】：P642;P736.21

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