长江下游马当矶对上下游航道变化关系的影响

长江城陵矶以下至长江口段长约1 200 km的河道,大大小小有120多个矶。这些山矶在地质上是一种断层破裂带,长江河床正是沿着这些破裂带发育,束缚了长江完全自由摆动的可能性。在矶头突出处往往河床较窄,过了矶头,河床变宽,形成宽窄相间的藕节状。根据历史记载,这些山丘、石矶很早就滨临大江,江岸一直比较稳定,这就决定了长江在历史时期的总流势。但由于各矶头所处的位置、地质构造不尽相同,相应的矶头对河道演变的影响作用也不尽相同,通过对马当矶的研究为系统研究长江中下游矶头作用机理提供了参考和借鉴。

Impact of Madangji cliff on changes of upstream & downstream channels

There're more than 120 cliffs of different scales along the channel from Chenglingji cliff to the Yangtze estuary which is about 1 200 km long.Since the Yangtze River develops along the fault zone,on which the cliffs grow,it is impossible for the Yangtze River to swing freely.The riverbed is usually narrow at the protruding site of the cliff and turns wide when passing the protruding head,thus it forms a lotus-root shaped one.According to historical records,these hills and cliffs have long been along the ri...