摘要
粒度是沉积物中各种粗细颗粒的机械组成,可以用于洪水沉积环境和物质运动方式的判定。通过对渭河咸阳段河漫滩沉积状况野外调查和53个样品的粒度资料分析,研究了渭河咸阳段的洪水沉积物粒度特征,分析了粒度组成、粒度参数和粒度频率曲线等粒度特征资料,探讨了渭河咸阳段洪水变化和沉积环境。研究结果表明,渭河咸阳段河漫滩北堡子剖面近30 a来洪水沉积厚度为2.16 m,主要粒度组成中砂粒级的含量最高,颗粒较粗,分选较差。根据粒度特征资料分析,渭河咸阳段河漫滩沉积物发育较好,变化明显,能够较清楚地指示渭河近30 a来发生的约13次洪水的变化。
Grain-size can be applied to identify types of deposition environment and to determine ways of material movement. Based on the investigation on the beach of Weihe River in Xianyang section, and the analysis of grain-size for 53 collected samples, the characteristics of flood sediment were analyzed, including grain-size distribution, grainsize parameter, and grain-size frequency curve. Results showed that the thickness of modern time flood sediment in the Beibuzi section of Weihe River was about 2. 16 m. For the grain-size composition, the content of medium size sand was the highest, its grain-size was in the thick range, and its size sorting was worse. Based on the analyzed material, the development of flood sediment was better over the past 30 years.
出处
《水土保持通报》
CSCD
北大核心
2008年第3期71-76,共6页
Bulletin of Soil and Water Conservation
基金
陕西省教育厅基金资助项目(06JK165)
咸阳师范学院自然科学专项基金(07XSYK211)
关键词
渭河咸阳段
粒度特征
洪水沉积物
Weihe River in Xianyang section
characteristic of grain-size
flood deposit
