利用1998年“大洋一号”调查船近海底作业所获的深拖海底电视和照相系统资料,对中国开辟区不利开采地形类型及其分布特征进行了研究,并对海底地形的坡度进行了计算,结果表明:(1)中国开辟区东、西两区海底的东向坡和西向坡是均衡分布的。东、西两区海底地形坡度的分布特征明显不同,东区海底地形坡度以0～15°为主,而西区坡度大于3°的地形则很少。坡度大于5°的地形主要分布于坡脚处,特别是坡度超过15°的地形总是出现在水深变化的转折点处。(2)研究区不利开采地形可分为坡度为5～15°和大于15°两种类型,东区地形坡度大于5°的不利开采地形比西区多14%,东区坡度大于15°的地形为3.6%,比西区(仅为1.4%)多,东、西两区都有少量坡度近90°的地形出现,并且这种地形在东区所占比率比西区大,说明东区断崖、陡坎和断裂沟槽比西区多,地形也更为复杂多变。 Based on the data of deep-towed seabed television and photographic system obtained from the near-ocean bottom operation of the Ocean One survey ship in 1998, the types and distribution characteristics of unfavorable mining terrain in China’s open-up area were studied and the slope of the seabed topography was studied The results show that: (1) Eastward and westward slopes of the seabed in the east and west of China’s Pace Area are evenly distributed. The distribution characteristics of the submarine topography in the eastern and western regions are obviously different. The gradient of the submarine topography in the eastern submarine ranges from 0 ° to 15 °, whereas the topography in the west with a gradient greater than 3 ° is rare. Topographies with a slope of more than 5 ° are mainly distributed at the foot of the slope. In particular, topographies with a slope of more than 15 ° always appear at the turning point of changes in water depth. (2) The unfavorable exploitation topography of the study area can be divided into two types of slope of 5 ~ 15 ° and greater than 15 °. The unfavorable exploitation topography with the gradient of the topography of the terrain in the east is more than 14% more than the west, and the terrain with the gradient of more than 15 ° in the east is 3.6 %, More than the western region (only 1.4%). There are a few terrain with a gradient of nearly 90 ° in the east and west regions, and the proportion of this terrain in the eastern region is larger than that in the western region, indicating that the cliffs, scarps and fractures Slot more than the west, the terrain is more complex and changeable.