Quantifying the sources and the transit times of sediment using fallout radionuclides (7Be, 137Cs, 210Pbxs) in contrasted cultivated catchments across the world
Abstract
Soil erosion and fine sediment supply to rivers are exacerbated in intensively cultivated catchments. Information on the sediment sources and transit times in rivers is required to improve our understanding of these processes and to guide the implementation of effective conservation measures. Accordingly, natural (7Be, 210Pb) and artificial (137Cs) fallout radionuclide concentrations were measured in overland flow and suspended sediment collected during the erosive season in contrasted cultivated catchments. In Laos, samples were collected in a steep catchment (Houay Pano, 12 km²) covered with cropland and teak plantations during the first flood of the monsoon in 2014. Cropland surface sources dominated the supply of sediment at the upstream sampling location (55%), whereas subsurface sources (channel, landslides) contributed the majority of material at the outlet (60%). Furthermore, the material exported from the catchment mainly consisted of re-suspended sediment.
Description
Presentado en: American Geophysical Union, Fall Meeting 2017. Section: Earth and Planetary Surface Processes, New Orleans 11-15 December 2017. Abstract #EP53E-03 -Emerging Technologies and Advances in Identifying Catchment Sediment Sources.
Date
2017-12-15
Keywords
Sediment transport , Monsoons , Flood routes , Suspended sediments , Soil erosion , Hydrology
Citation
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Publisher
American Geophysical Union