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Sediment Fingerprinting in the Nile Nyabarongo Upper Catchment, Rwanda
Abstract and Figures
Water resources management in Rwanda faces a major challenge in relation to the sedimentation of rivers and lakes due to soil erosion from both agricultural and industrial (mining) practices. Remedial measures necessitates knowing the precise sources of the sediment, which is difficult in the extensive mountainous region. This study identifies the regions in the Upper Nyabarongo catchment that are possibly the largest contributors of sediment to the highly turbid headwaters of the Nile. Elemental composition of soils in all the various geological types were obtained using mass spectrometry via laser ablation. River sediment elemental composition was similarly obtained and a mass balance approach used to infer percentages of source sediments. Maps of the catchment were created from the results with a color scheme indicating the proportions of sediment being sourced from.
Figures - uploaded by Amartya K Saha
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