泾河流域现代洪水泥痕沉积学特征研究  

Sedimentological characteristics of mud cracks of the modern flood deposit in Jinghe River basin

作　　者：朱向锋[1,2] 黄春长[1] 查小春[1,3] 庞奖励[1] 李晓刚[1] 姚平[1] 

机构地区：[1]陕西师范大学旅游与环境学院,西安710062 [2]西安职业技术学院,西安710077 [3]中科院水利部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,杨凌712100

出　　处：《干旱区资源与环境》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

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.

关 键 词：泾河流域 洪痕 粒度分析 

分 类 号：P333.4[天文地球—水文科学]