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引用次数: 0
摘要
泥石流运动导致的水沙关系变化对河床的演变影响极大。然而,人们对长期沉积物源区的管理对干流河床形态演变的影响知之甚少。在本研究中,我们利用过去 50 年的多源遥感图像、流域水沙和地形数据以及泥石流的泥沙输移数据,分析了中缅边境大盈江中下游的演变过程。我们的研究结果表明:(1)泥沙源区的治理使河床形态由侵蚀变为侵吞,河面由宽浅变为窄深,河道由多线程变为单线程;(2) 活动冲积面积、边障面积和平均河宽呈倒 V 型趋势,先增加至少 23%,后减少 59%以上;以及 (3) 河床形态的演变有助于下游河床的稳定、防洪能力的提高和洪泛区利用率的提高。
Evolution of riverbed morphology in a main-stem river due to management of sediment source areas
The evolution of riverbeds is greatly impacted by changes in the water–sediment relationship resulting from the movement of debris flows. However, little is known about the influence of management in chronic sediment source areas on the evolution of main-stem riverbed morphology. In this study, we used multi-source remote sensing images covering the past 50 years along with water–sediment and topographic data from a river basin, and sediment transport data from debris flows, to analyze the evolutionary processes of the middle and lower reaches of the Daying River (DYR) at the China-Myanmar border. Our results showed that (1) management of the sediment source area shifted the riverbed morphology from aggradation to erosion, transforming the river surface from wide and shallow to narrow and deep, and the channel from multi-threaded to single-threaded; (2) the active alluvial area, marginal bar area, and average river width exhibited an inverted V-shaped trend, increasing by at least 23% and then decreasing by more than 59%; and (3) the evolution of riverbed morphology contributed to the stability of downstream riverbeds, improved flood control, and enhanced utilization of the floodplains.
期刊介绍:
Earth Surface Processes and Landforms is an interdisciplinary international journal concerned with:
the interactions between surface processes and landforms and landscapes;
that lead to physical, chemical and biological changes; and which in turn create;
current landscapes and the geological record of past landscapes.
Its focus is core to both physical geographical and geological communities, and also the wider geosciences