摘要
文中通过对泾河流域深入调查研究,在泾河干流和支流河槽发现了三处印迹明显的现代洪水泥痕。通过对洪痕泥沙粒度和磁化率特征分析表明泾河流域的洪痕的磁化率特征与黄土L1相似。粒度组成以粉沙为主,粘粒、沙粒含量较低。其沉积性质为粉质亚粘土,与流域内的黄土、古土壤性质相近。泾河洪水发生时泥沙含量高,在悬移搬运中流速大,故沉积较快,分选性较差。该研究可对于泾河流域的防洪减灾、水利水电工程设计和水土流失防治具有重要科学意义。
The grain - size and magnetic susceptibility characteristics of three spots of mud cracks of the modern flood deposit in Jinghe River basin were analyzed. The results showed that magnetic susceptibility characteristic of mud cracks of the flood deposit was similar to Loess 1. The silt content of the modern flood trace was maximum, the clay and the sand content were low. Mud cracks were silty mild clay, and similar to loess -soil. The flood deposit was suspended matter, the sorting features of mud cracks of the modern flood deposit was worse. Because the silt content was higher, and flood flow velocity was the key to sediment transporting capacity when flood happened. The results had the scientific significance to engineering construction, flood control and the improvement of the eco - environment of the Jinghe River basin.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2009年第8期86-90,共5页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目(40771018)
教育部博士点基金(20050718008)
陕西省自然科学基金项目(2006D01)
中科院水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室基金(10501-176)
陕西师范大学优秀科技预研项目(200702001)资助
关键词
泾河流域
洪痕
粒度分析
Jinghe River basin
mud cracks
flood deposit
grain - size analysis
作者简介
朱向锋（1977-），男，陕西临潼人，硕士，主要研究方向为土地资源开发与环境演变。E—mail：zhuxiangfeng@stu．snnu．edu．cn
