摘要
通过地貌形态、粒度分析和定向样品切片分析等资料探讨查菁沟泥石流的沉积特征及其反映的泥石流动静力学特征。砾石的含量下游较少 ,砂的含量由下游向上游减少 ,大于 4 m m碎屑向顶层减少 ,黏土相反。容重总平均值由下游向上游逐渐增加 ,横剖面中容重有由下向上的增加的趋势。定向切片的纵剖面中粗大碎屑反映出由底向顶倾角增大的特点 ,优势倾向上游 ;横剖面显示主流线两侧的碎屑以向主流线 (向内 )倾斜为主 ,构成一种“向心状”构造。沉积主体表现为混杂构造 ,底部多表现为纹层理构造 ,表现出底部层流 ,上部塞流特点。
Landforms, grain sizes and structure observation by microscope shows that deposits of high density viscous debris flow reflect the behavior of basal laminar flow and upper plunger flow. There are more gravels and sands in the down stream than in upper stream. Clay content decreases from down stream to upper stream. The volume content increase from down stream to upper stream. Sedimentary structures show regular fabric in longitudinal and transverse section.
出处
《水土保持研究》
CSCD
2003年第3期1-2,7,共3页
Research of Soil and Water Conservation
基金
国家自然科学基金资助 ( 90 10 2 0 16
40 2 710 14 )
