复杂地质背景下大陆坡脚点的确定方法:以莫桑比克南部陆缘为例

doi:10.3969/j.issn.1001-909X.2024.01.002

海洋学研究 ›› 2024, Vol. 42 ›› Issue (1): 13-22.DOI: 10.3969/j.issn.1001-909X.2024.01.002

复杂地质背景下大陆坡脚点的确定方法:以莫桑比克南部陆缘为例

庄宝江¹^,²(), 唐勇¹^,²^,³^,⁴^,⁵^,^*(), 吕孝辉⁶, 杨春国¹^,², 吴招才¹^,², 李赫¹^,²

1.自然资源部第二海洋研究所,浙江杭州 310012
2.自然资源部海底科学重点实验室,浙江杭州 310012
3.上海交通大学海洋学院,上海 200030
4.中国地质大学(武汉) 海洋地质资源湖北省重点实验室,湖北武汉 430074
5.南方海洋科学与工程广东省实验室(珠海),广东珠海 519000
6.北京大业嘉成科技有限公司,北京 102200

收稿日期:2023-02-21 修回日期:2023-04-26 出版日期:2024-03-15 发布日期:2024-05-11
通讯作者: * 唐勇(1974—),男,研究员,主要从事海洋地球物理、海底动力演化方面的研究,E-mail:tangyong@sio.org.cn。
作者简介:庄宝江(1997—),男,江苏省淮安市人,主要从事大陆架划界方法方面的研究,E-mail:1258545329@qq.com。
基金资助:
国家自然科学基金项目(41830537);国家重点研发计划项目(2017YFC1405504);“全球变化与海气相互作用”专项二期任务(GASI-01-DLJHJ-CM)

Method for determining the foot point of continental slope in complex geological background: Take the southern continental margin of Mozambique as an example

ZHUANG Baojiang¹^,²(), TANG Yong¹^,²^,³^,⁴^,⁵^,^*(), LÜ Xiaohui⁶, YANG Chunguo¹^,², WU Zhaocai¹^,², LI He¹^,²

1. Second Institute of Oceanography, MNR, Hangzhou 310012, China
2. Key Laboratory of Submarine Geosciences, MNR, Hangzhou 310012, China
3. School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China
4. Hubei Key Laboratory of Marine Geological Resources, China University of Geoscience, Wuhan 430074, China
5. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China
6. Beijing Dynovision Technology Co., Ltd., Beijing 102200, China

Received:2023-02-21 Revised:2023-04-26 Online:2024-03-15 Published:2024-05-11

摘要/Abstract

摘要：

针对复杂地质背景下的大陆架划界问题,提出了一种新的大陆坡脚点(foot point of the continental slope,FOS)确定方法。该方法基于水深平均梯度变化计算坡脚点所在位置,并结合相反证明以及凸包性、分段性、连续性原则进行优化。以莫桑比克南部陆缘为研究区域,利用2021年实测的高精度多波束地形数据,应用该方法提取了大陆架划界最关键的依据——FOS,并与联合国大陆架界限委员会使用的Geocap软件提取的结果进行对比,确认了相同的FOS位置,证明该方法是准确有效的。

关键词: 大陆架划界, 大陆坡脚点, 平均梯度变化, 莫桑比克南部陆缘

Abstract:

A new method for determining the foot point of the continental slope (FOS) was proposed for the delineation of the continental shelf in a complex geological context. This method calculated the location of the foot of slope based on the mean gradient of water depth and optimized it by combining the contrary evidence and the principles of convexity, segmentation and continuity. Using the southern continental margin of Mozambique as the study area, the method was applied to extract the most critical basis—FOS for continental shelf delineation using high-precision multibeam topographic data measured in 2021, and the result was confirmed by comparison with those extracted by the Geocap software which is used by the United Nations Commission on the Limits of the Continental shelf, proving the effectiveness and accuracy of this method.

Key words: delimitation of continental shelf, foot point of slope, average gradient changes, southern continental margin of Mozambique

中图分类号:

P229.6

庄宝江, 唐勇, 吕孝辉, 杨春国, 吴招才, 李赫. 复杂地质背景下大陆坡脚点的确定方法:以莫桑比克南部陆缘为例[J]. 海洋学研究, 2024, 42(1): 13-22.

ZHUANG Baojiang, TANG Yong, LÜ Xiaohui, YANG Chunguo, WU Zhaocai, LI He. Method for determining the foot point of continental slope in complex geological background: Take the southern continental margin of Mozambique as an example[J]. Journal of Marine Sciences, 2024, 42(1): 13-22.

图/表 9

图1 莫桑比克南部陆缘区域构造图 (图件改绘自文献[14]。MCSP003为本文研究的多波束测线和地震剖面位置。)

Fig.1 Regional tectonic map of the southern margin of Mozambique (The figure is modified from reference [14]. MCSP003 shows the location of the multibeam and seismic profile investigated in this study.)

图2 莫桑比克南部陆缘测线及FOS位置

Fig.2 Survey line and FOS in southern continental margin of Mozambique

图3 实测多波束地形(a)以及三维地形展示图(b) (红色箭头指示海底峡谷和洼地对应的三维地形。)

Fig.3 Multibeam terrain (a) and 3D terrain display map (b) (The red arrow shows the submarine canyons and depressions corresponding to the three-dimensional topography.)

图4 Geocap平均坡度示意图

Fig.4 Sketch map of Geocap average slope

图5 有限差分拟合及一阶和二阶导数图

Fig.5 Finite difference fitting and first and second derivative graph

图6 有限差分拟合的地形剖面与坡度变化对比图

Fig.6 Comparison of topographic profile and slope change under finite difference fitting

图7 不同点后步长下地形剖面与平均梯度变化对比图

Fig.7 Comparison of topographic profile and mean gradient change at different step lengths

图8 莫桑比克南部陆缘区域地形变化及地球物理特征

Fig.8 Topographic variation and geophysical characteristics in the southern continental margin of Mozambique

图9 Geocap下的FOS分析

Fig.9 FOS analysis using Geocap

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复杂地质背景下大陆坡脚点的确定方法:以莫桑比克南部陆缘为例

Method for determining the foot point of continental slope in complex geological background: Take the southern continental margin of Mozambique as an example

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