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| 长江中下游河床沉积物分布特征 | |
| 引用本文： | 赵怡文,陈中原.长江中下游河床沉积物分布特征[J].地理学报,2003,58(2):223-230. |
| 作者姓名： | 赵怡文 陈中原 |
| 作者单位： | 1. 华东师范大学教育部地理信息开放实验室,上海,200062 2. 华东师范大学河口海岸国家重点实验室,上海,200062 |
| 基金项目： | 美国国家地理学会基金资助项目(6693-00)~~ |
| 摘 要： | 对长江中下游武汉至河口段304处河床沉积物样品进行了粒度测量与分析，通过各参数间的模拟、统计及对比，探讨了沉积物粒度、水动力因素及河床地貌三者间的关系。研究结果表明：本区河床沉积物以中、细砂为主，床底搬运十分微弱，河道相对稳定；从上至下沿程有明显的“粗－细－粗－细”粒径变化，主要反映河流动力地貌、动力沉积特征；粒径在河床的沿程分布总体为北粗南细，说明北岸侵蚀，南岸淤积的特点。研究同时也表明，颗粒因河型不同而迥异；颗粒偏态度－峭度在不同河型中表现各异，对区分顺直微弯分汊和鹅头形分汊河道尤为显著。 |
| 关 键 词： | 沉积物 粒度 河流地貌 长江 粒度 河床 |
| 收稿时间： | 2002-02-19 |
| 修稿时间： | 2002年2月19日 |
Sediment Distribution in the Yangtze River Channel below Wuhan |
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| ZHAO Yiwen,CHEN Zhongyuan.Sediment Distribution in the Yangtze River Channel below Wuhan[J].Acta Geographica Sinica,2003,58(2):223-230. | |
| Authors: | ZHAO Yiwen CHEN Zhongyuan |
| Institution: | 1. Lab. of Geographic Infomation Science, East China Normal University, Shanghai 200062, China; 2. Institute for Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China |
| Abstract: | fluvial transects were specifically selected along the Yangtze River channel extending from Wuhan to the river mouth. Three samples were taken at each transect, i.e., one from the main river channel and the other two from both flank shallow-water riverbeds. The present study examines the distribution of grain size throughout the river channel, in terms of along the river-channel transect and along the one perpendicular to the river channel. This is primarily on the basis of different river-channel patterns defined. Computing simulation of various grain-size parameters obtained from the laboratory helps recognize effectively the sediment characteristics of the river patterns. It is believed that the river flow and river morphology affected largely by the regional geology, climate setting, etc., are the determinant factors, which characterize the sedimentation of the middle and lower Yangtze river catchment. The paper demonstrates that the sedimentation of modern Yangtze River channel below Wuhan remains relatively stable, as evidenced by: 1) almost equivalent input and output of sediment budget in the upstream Hankou and downstream Datong hydrological stations; and 2) bed load movement rarely occurred in the river channel where fine and medium sand prevail. Four segments of the sediment distribution of the river channel recognized as "coarser-finer-coarser-finer" were differentiated. |
| Keywords: | sediment distribution grain size parameters river morphology Yangtze River |
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