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首页> 外文期刊>Annual review of marine science >Construction and Maintenance of the Ganges-Brahmaputra Meghna Delta: Linking Process, Morphology, and Stratigraphy
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Construction and Maintenance of the Ganges-Brahmaputra Meghna Delta: Linking Process, Morphology, and Stratigraphy

机译:恒河-布拉马普特拉-梅格纳三角洲的建设与维护:联系过程,形态学和地层学

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摘要

We present a review of the processes, morphology, and stratigraphy of the Ganges-Brahmaputra-Meghna delta (GBMD), including insights gained from detailed elevation data. The review shows that the GBMD is best characterized as a composite system, with different regions having morphologic and stratigraphic attributes of an upland fluvial fan delta; a lowland, backwater-reach delta; a downdrift tidal delta plain; and an offshore subaqueous-delta clinoform. These distinct areas of upland and lowland fluvial reaches and tidal dominance vary in time and space, and we distinguish late-Holocene phases of delta construction, maintenance, and decline similar to delta-lobe cycling in other systems. The overall stability of the GBMD landform, relative to many deltas, reflects the efficient, widespread dispersal of sediment by the large monsoon discharge and high-energy tides that affect this region. However, we do identify portions of the delta that are in decline and losing elevation relative to sea level owing to insufficient sediment delivery. These areas, some of which are well inland of the coast, represent those most at risk to the continued effect of sea-level rise.
机译:我们对恒河-布拉马普特拉-梅格纳河三角洲(GBMD)的过程,形态和地层进行了综述,包括从详细海拔数据中获得的见解。综述表明,GBMD最好地表现为一个复合系统,不同区域具有高地河流扇形三角洲的形态和地层属性。低地,回水到达三角洲;下漂潮汐三角洲平原;和离岸水下三角洲斜形岩层。高地和低地河流河段和潮汐优势的这些不同区域在时间和空间上各不相同,并且我们区分了三角洲晚期的新星建设,维持和衰退阶段,类似于其他系统中的三角波循环。与许多三角洲相比,GBMD地貌的整体稳定性反映了影响该地区的大季风流量和高能潮对沉积物的有效而广泛的分散。但是,由于沉积物输送不足,我们确实确定了三角洲中相对于海平面而言下降和丧失高度的部分。这些地区,其中一些位于沿海内陆,代表着最有可能继续承受海平面上升影响的地区。

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