Dredging for navigation: a cogitative study on Brahmaputra River

IF 1.827 Q2 Earth and Planetary Sciences Arabian Journal of Geosciences Pub Date : 2024-09-10 DOI:10.1007/s12517-024-12059-3
Vijay Meena, Arup Kumar Sarma
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Abstract

Navigation channels provide a vital link in the supply chain of inland transport. Excavation of sediment from the river bed and fluvial islands is necessary to make the large braided river navigable for transportation. Present research work investigates the feasibility of dredging operations in the mid-sand bars of the Brahmaputra River (Assam, India) for navigation purposes. Pernicious metal (Cu, Zn, Fe, Mn, Ni, Co, Cr, Pb, Cd) concentrations were assessed at 42 sampling locations, covering a reach length of approx. 600 km (reaches 1 and 2). Vertical samples were obtained from 0 cm, 50 cm, and 100 cm of the mid-sand bar. Various indices were evaluated to quantify the contamination level in the mid-sand bars. Based on the enrichment factor (EF), reach 2 was highly enriched with toxic metal-limiting dredging operation. Conversely, reach 1 was found suitable for dredging operations, owing to the low EF value. Various anthropogenic activities are likely to be the causative factor for the heavy metal enrichment in reach 2, including effluents from pharmaceutical industries, oil refineries, and industrial and domestic runoff. Statistical analysis also endorsed those heavy metals possess similar anthropogenic origins. Overall, the dredging can be feasible for reach 1 and at localized zones for reach 2 across the Brahmaputra River. Further, the study tries to present a suitable mitigation measure to carry out dredging operations and manage contaminated dredged sediment for reach 2.

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航运疏浚:对雅鲁藏布江的思考性研究
航道是内陆运输供应链中的重要一环。为了使大型辫状河能够通航运输,必须从河床和河中岛屿挖掘沉积物。目前的研究工作调查了在布拉马普特拉河(印度阿萨姆邦)的中沙洲进行疏浚作业以达到通航目的的可行性。在 42 个取样点评估了有害金属(铜、锌、铁、锰、镍、钴、铬、铅、镉)的浓度,覆盖河段长度约 600 公里(河段 1 和河段 2)。垂直样本取自中沙洲 0 厘米、50 厘米和 100 厘米处。对各种指数进行了评估,以量化中沙洲的污染程度。根据富集因子 (EF),2 号河段在有毒金属限制疏浚作业下富集程度较高。相反,由于富集因子值较低,1 号河段适合进行疏浚作业。各种人为活动可能是导致河段 2 重金属富集的原因,包括制药业、炼油厂的污水以及工业和生活径流。统计分析表明,这些重金属具有相似的人为来源。总体而言,在雅鲁藏布江河段 1 和河段 2 的局部区域进行疏浚是可行的。此外,该研究还试图为雅鲁藏布江 2 号河段的疏浚作业和受污染的疏浚沉积物管理提出合适的缓解措施。
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来源期刊
Arabian Journal of Geosciences
Arabian Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-
自引率
0.00%
发文量
1587
审稿时长
6.7 months
期刊介绍: The Arabian Journal of Geosciences is the official journal of the Saudi Society for Geosciences and publishes peer-reviewed original and review articles on the entire range of Earth Science themes, focused on, but not limited to, those that have regional significance to the Middle East and the Euro-Mediterranean Zone. Key topics therefore include; geology, hydrogeology, earth system science, petroleum sciences, geophysics, seismology and crustal structures, tectonics, sedimentology, palaeontology, metamorphic and igneous petrology, natural hazards, environmental sciences and sustainable development, geoarchaeology, geomorphology, paleo-environment studies, oceanography, atmospheric sciences, GIS and remote sensing, geodesy, mineralogy, volcanology, geochemistry and metallogenesis.
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