摘要
中国海域辽阔,但公开发表和出版的1∶100万及更大比例尺的海底地貌图尚属空白。在综合研究已有的海底地貌分类系统的基础上,以南沙群岛郑和群礁幅为实验区,尝试建立了该海区1∶100万海洋地貌分类系统,利用历年来南沙群岛海区等深线图(1∶50万)、沉积图(1∶200万)、地质地球物理图集(1∶100万)及各种文献资料和在专家指导的基础上,绘制了该幅的海底地貌图并对该区域的地貌格局进行了分析。实验表明,通过对现有资料的综合进行1∶100万海底地貌制图是可行的。实验发现:1)等深线数据如同陆地上的等高线数据,是进行海底地貌制图的基本和主要数据源;2)海底底质和沉积物数据是进行海底地貌成因类型判别的重要依据;3)海底构造格局对海底地貌格局起着根本的控制作用,因此海底地质地球物理数据也是进行海底地貌制图不可或缺的数据之一。
So far there has not been any seafloor geomorphological map published in China with a scale larger than 1 ： 1 000 000. With a comprehensive analysis of existing classification system for seafloor geomorphology and taking the Zhenghe breadth of the Nansha Islands as an example, an attempt has been made to establish an oceanic geomorphological classification system with a scale of 1： 1 000 000. Based on the integrative study of available data of various scales in the exampled area, including the isobath map （1 ： 500 000）, the sedimentologic map （1 ： 2 000 000）, the atlas of geology and geophysics （1 ： 1 000 000）, and other documents, a seafloor geomorphological map of this area is drawn, based on which the geomorphological pattern is analyzed. The experimental results show that it is feasible to create a geomorphological map with a scale of 1 ： 1 000 000 based on the existing data of multiple disciplines. The following observations can also be made. 1） Isobaths, similar to the contours of a topographical map, are the basic data for seafloor geomorphological mapping. 2） Seabed composition and deposit data are the foundation for the classification of seafloor genesis types. 3） Geomorphological pattern of seafloor is controlled by geological structures. For example, the geomorphological pattern of the study area is controlled by the faults in NESW and NW-SE directions, therefore the geological and geophysical data are also valuable in seafloor geomorphological mapping.
出处
《热带海洋学报》
CAS
CSCD
北大核心
2007年第6期34-39,共6页
Journal of Tropical Oceanography
基金
国家自然科学杰出青年基金项目(40225004)
关键词
南沙群岛
海底地貌
珊瑚礁
地貌制图
Nansha Islands
seafloor geomorphology coral reef
geomorphological mapping
