孟加拉国布拉马普特拉河贾木纳河段演变的几个问题

An Investigation on Several Problems of the Evolution in the Brahmaputra-Jamuna River Reach in Bangladesh

本文阐述了布河的水文、泥沙以及比降条件。经过统计分析,指出布河具有相对稳定的节点和大江心洲以及分汊河道演变的特点,布河河岸的侵蚀,是单向的平面移动并伴随着江心洲演变的并洲并岸过程。文中将布河与长江中下游分汊河道进行了初步比较。经综合分析,认为布河河型为江心洲分汊河道。

A comparison of water and sediment inflow condition between the Brahmaputra-Jamuna River and the middle and lower Yangtze River is described. Statistics of satellite photomaps indicate that the Brahmaputra-Jamuna River has relative stable nodes and large islands and is possessed of the characteristics of fluvial processes of braided channels. Its bank erosion as a single-directional plane movement is accompanied with the combining process of islands with bars or among islands. It is found from comprehensive analysis that the river pattern of the Brahmaputra-Jamuna River Reach belongs to an unstable braided channel with islands.