摘要
高分辨率声学系统在黄河口区记录到水下河道、埋藏沟谷、塌陷坑、陡缘洼地、滑块体、断层和浅层气等特征。水下三角洲可划分为浅水台地平整区、斜坡低隆起区、斜坡浅沟坑区、斜坡深沟坑区和斜坡前缘低角度平坦区五个底坡稳定性不同的微地貌单元。研究表明,水下三角洲的沉积-地貌格局受控于黄河汛期的巨量输沙、河口区的快速沉积和重力再搬运以及波浪和余环流因素。对影响底坡不稳定性的沉积物力学性质、自然地震和风暴潮因素也作了初步讨论。
The subaqueous channels , collapses Repressions , slide masses , faults and gas steps have beert recorded using high-resolution acoustic systems in the Yellow River Estuary area. The subaqueous delta of the Yellow River can be divided into five geomorphic units with different slope instabilities , which are shallow platform, broad low relief, shallow channel depression,deep channal depression and smooth slope front areas. The studies have shown that the sedimentary framework and geomorphic features of the subaqueous delta are controlled by silt discharge of the Yellow River during the flood periods as well as actions of wave, residual circulation and gravity resedimentation. The mechanical properties of sediment,earthquake and storm tide affecting the instability of the submarine slope are also preliminarily discussed.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1995年第3期11-23,共13页
Marine Geology & Quaternary Geology
关键词
水下三角洲
河口
沉积物
底坡
不稳定性
黄河
subaqueous delta estuarine sediment submarine slope instability
