尼日利亚海侵泥质海岸粘性沉积物的可蚀性: 初步实验研究

ADESINA Rasheed; DADA Olusegun; ASIWAJU-BELLO Yinusa; HE Zhiguo

doi:10.3969/j.issn.1000-5641.202092222

尼日利亚海侵泥质海岸粘性沉积物的可蚀性: 初步实验研究

doi: 10.3969/j.issn.1000-5641.202092222

1.
浙江大学海洋学院, 浙江舟山　316021, 中国
2.
联邦理工大学海洋科学与技术系, 阿库雷　340252, 尼日利亚
3.
联邦理工大学应用地质系, 阿库雷　340252, 尼日利亚

详细信息

中图分类号: TV142
计量
- 文章访问数: 83
- HTML全文浏览量: 35
- PDF下载量: 2
- 被引次数: 0
出版历程
- 收稿日期: 2020-04-21
- 网络出版日期: 2021-01-27
- 刊出日期: 2021-01-27

Erodibility of cohesive sediments along the Nigerian transgressive mud coast: A preliminary experimental study

1.
Ocean College, Zhejiang University, Zhoushan Zhejiang　316021, China
2.
Department of Marine Science and Technology, Federal University of Technology, Akure　340252, Nigeria
3.
Department of Applied Geology, Federal University of Technology, Akure　340252, Nigeria

More Information

Corresponding author: hezhiguo@zju.edu.cn

摘要

摘要: 河口和沿海地区由于陆地和海洋的相互联系而具有重要的生态和经济意义. 各种自然和人为事件影响着这些地区的地貌不平衡, 因此研究泥沙输移动态有助于海岸带的可持续管理. 本文研究了尼日利亚西南部大西洋沿岸海侵泥质海岸海相粘土的一些基本物理和矿物性质. 结果表明, 该区粘土矿物以高岭石和伊利石为主. 沉积物的水分和有机质含量较高, 说明了微生物的作用和生物活性. 它们具有相对较低的液限(< 60%)、塑性指数(< 15%)和粘土不活性(> 0.5). 尽管沉积物通常是低塑性的有机粉土/粘土, 但伊洛托罗泥浆倾向于中塑性到高塑性的有机粘土. 此外, 沉积物中有机质与粘土含量之间存在正相关关系, 它们支持沉积物化学对其物理性质的影响, 从而影响沉积物的可蚀性. 需要进行进一步的研究, 以确定沉积物的力学性质, 并生成一个沉积物输运模型, 用于准确预测淤泥质海岸沉积物的侵蚀阈值. 这项研究的结果将适用于世界各地具有类似沉积物特性的海岸带, 以满足环境、工程和公共卫生的需要.
- 河口 /
- 泥泞的海岸 /
- 可蚀性 /
- 有结合力的沉积物
- estuaries /
- mud coast /
- erodibility /
- cohesive sediments

HTML全文

Fig. 1 Map of Nigeria showing the study area

下载: 全尺寸图片幻灯片

Fig. 2 (A) Classification chart of the clays (modified from Casagrande, 1948), (B) Relationship between clay and organic content

Note: CL = Inorganic clays of low to medium plasticity; OL = Organic silts and organic silt-clays of low plasticity; ML = Inorganic silts, very fine sands, silty or clayey fine sands, of low plasticity; OH = Organic clays of medium to high plasticity; CH = Inorganic clays of high plasticity; MH = Inorganic silts of high plasticity

下载: 全尺寸图片幻灯片

Tab. 1 Basic physical and mineralogical properties of the sediments

LOCATION	Moisture content/%	Organic content/%	pH	sand/%	silt/%	clay/%	Liquid Limit/%	Plastic Limit/%	Plasticity Index/%	Activity (PI/Clay fraction)	Dominant clay mineral
Gbabijo	60.1	11.6	7.39	10.1	50.5	39.4	39.9	32.6	7.3	0.19	Kaolinite
Ayetoro	58.5	14.3	7.2	13.1	44.8	32.1	54.1	40.7	13.4	0.42	Illite
Ilowo	68.7	14.8	7.14	10.2	68.1	21.3	43.2	37.9	5.8	0.27	Kaolinite

下载: 导出CSV

参考文献(6)

[1]	MCGRANAHAN G, BALK D, ANDERSON B. The rising tide: Assessing the risks of climate change and human settlements in low elevation coastal zones [J]. Environment and Urbanization, 2007, 19: 17-37.
[2]	SMITH K. We are seven billion [J]. Nature Climate Change, 2011(1): 331-335.
[3]	DADA O A, AGBAJE A O, ADESINA R B, et al. Effect of coastal land use change on coastline dynamics along the Nigerian transgressive Mahin mud coast [J]. Journal of Ocean and Coastal Management, 2019, 168: 251-264.
[4]	EBISEMIJU F S. An evaluation of factors controlling present rates of shoreline retrogradation in the Western Niger Delta, Nigeria [J]. Catena, 1987, 14: 1-12.
[5]	SEXTON W J, MURDAY M. The morphology and sediment character of the coastline of Nigeria-the Niger Delta [J]. Journal of Coastal Research, 1994, 10(4): 959-977.
[6]	GRABOWSKI R C, DROPPO I G, WHARTON G. Erodibility of cohesive sediment: The importance of sediment properties [J]. Earth-Science Reviews, 2011, 105: 101-120.