Modern sediment supply to the lower delta plain of the Ganges-Brahmaputra River in Bangladesh
Modern sediment supply to the lower delta plain of the Ganges-Brahmaputra River in Bangladesh
复制标题
孟加拉国恒河-雅鲁藏布江下游三角洲平原的现代沉积物供应
DOI：
10.1007/s003670100069
复制
发表时间：
2001
影响因子：
2.1
通讯作者：
E. B. Kepple
中科院分区：
文献类型：
--
作者：
M. Allison;E. B. Kepple
摘要。从孟加拉国恒河-布拉马普特拉河下游（潮汐）三角洲平原收集的振动钻和螺旋钻样本进行了检查，以确定该地区是否是河流沉积物的重要汇。沉积物中137Cs活性和放射性碳的测量表明，沉积物正在以年代际和千年为时间尺度以1.1 cm/年的速率积累。下游三角洲平原的沉积物最初是由恒河-雅鲁藏布江水系提供的，主要来自近海来源，由盛行洋流向西携带，并由季风海岸装置和气旋事件向内陆平流。
Abstract. Vibracores and auger samples collected from the lower (tidal) delta plain of the Ganges-Brahmaputra River in Bangladesh were examined to determine whether the area is a significant sink for riverine sediments. Measurements of 137Cs activity and radiocarbon in the sediments indicate sediment accumulation is taking place on decadal and millennial time scales at rates reaching 1.1 cm/year. The sediment of the lower delta plain is primarily derived from an offshore source after having originally been supplied by the Ganges-Brahmaputra river system, carried westward by prevailing currents and advected inland by monsoonal coastal setup and cyclonic events.