1) lower terrace
低级阶地
1.
By studying of the material of lower terrace of deep groundwater in Xianyang,it illustrates that there is considerable rich resources of groundwater at lower terrace under 300 m in Xianyang.
通过分析咸阳市区低级阶地深层地下水资料 ,说明当地在 30 0m以下赋存比较丰富的地下水资源。
3) low-tide terrace
低潮阶地
4) first grade terrace
一级阶地
1.
Lithologic characteristics of the unsaturated zone and its impact on adsorption and degradation of pesticide in the first grade terrace of Songhua River;
松花江一级阶地包气带岩性特征及其对农药吸附与降解的影响
6) second terrace
二级阶地
1.
Origin of the second terraces in the Huangshui drainage area,Qinghai,China,studied based on sporopollen records.;
依据孢粉记录初探青海湟水流域二级阶地的成因
2.
<Abstrcat>Through the field research of landform and cultural sites in Guanting basin of the upper reaches of the Yellow River in Qinghai Province, the authors analyzed the structure of the second terrace of Guanting basin and concluded that the second terrace came into being in middle Holocene.
通过对黄河上游官亭盆地地貌及古文化遗址的野外考察,分析了盆地中黄河二级阶地的结构,认为该阶地形成于全新世中期。
补充资料:大陆阶地
又名大陆台阶。高出洋盆的大陆块平台,由大陆架及大陆坡组成。平均宽度102公里,平均坡度0.1~4.3°,平均深度从33米至1400~2500米(有时可达3200米),总面积5500万公里2,约占世界海洋总面积的15.3%。其成因同海平面的变化及地壳构造运动有关。前者因大陆冰川消融,导致海面上升,使部分大陆边缘地区被海水淹没。后者因地壳的垂直升降和水平运动,以及地震与火山活动,使部分地壳陷入海底而成。此外,根据板块构造学说,大陆地壳与大洋地壳发生碰撞、对冲运动时,在俯冲带内,地壳发生断裂、弯曲及向下俯冲等,形成陡峭的斜坡,其上即为面积宽广、坡度较平缓的大陆台阶。
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参考词条