摘要
黄河独特的水文条件、沉积物的细粒特性 ,以及黄河三角洲地区近年来的半干旱气候条件 ,尤其黄河近年来严重断流导致了黄河三角洲水上平原发育了大量的异常地质现象 ,特殊侵蚀沟槽便是其中之一。根据平面形态侵蚀沟槽可分为线状、树枝状、坑洞状、面状 ,网状及隧道状几种 ;横剖面形态有“U”形、“V”形、梯形或窄缝形。其规模不一 ,小者长数厘米 ,宽深数厘米 ;大者长数十、甚至百余米 ;宽十几米 ,深数十厘米到一米多。沟槽壁上常发育滑塌、流痕或类钟乳等次级构造。
The geological environment in Yellow River delta is characterized by unusual hydrologic conditions, fine sediments, semi?arid climate and frequent flow?abruption. Consequently, many peculiar geological phenonena, such as the unusual erosion channels, are developed abundantly in the overwater plain. It is believed that these channels are formed by runoff resulting from rain and/or melt snow and ice under exposure condition. Based on their plane morphologies, the unusual erosion channels may be divided into six types, i.e., linear, dendritic, pit?like or hole?like, planar, net like and tunnel like channels. The size of channel is variable. The small channels usually are tens of centimeters in length and a few centimeters in width and depth, while the large one could reach up to tens of meters in length. The channel wall often has slump (deformation) structures, rill marks and silt stalatite?like structures.
出处
《高校地质学报》
CAS
CSCD
2000年第3期462-469,共8页
Geological Journal of China Universities
基金
国家重点基础研究发展规划项目!(G19990 436 0 3)
国家自然科学基金项目!(49972 0 37)
山东省自然科学基金项目!(Q99E0 1)
