Abstract
Characterizing the dynamics of fluvial sediment sources over space and time is often critical in identifying human impacts on fluvial systems. Upland interfluve and subsoil sources of suspended sediment at Loco Bayou, Texas, were distinguished using 226Ra/232Th, 226Ra/230Th and, 228Ra/232Th. Source contributions were apportioned at three stations during within-bank and flood flows. 137Cs and 210Pbxs (excess 210Pb) were used to determine floodplain sedimentation; suspended sediment 210Pbxs/137Cs data mirrored results of Ra/Th, showing dominance of subsoil sources during within-bank flows, changing to interfluve sources during flood. This trend corresponds spatially to influx of sediment from ephemeral tributaries, reflecting mobilization of stored interfluvial sediments during flood stage. Upper basin sedimentation was similar but markedly less at the lowermost station. These results indicate (1) modified ephemeral tributaries store sediment derived from sheet wash, discharging them during flood, and (2) southernmost Loco Bayou is episodically re-worked, resulting in significantly reduced local rates of sedimentation.
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Acknowledgements
Funding provided by the Texas Water Development Board, Texas Water Resources Institute, Geological Society of America, The Gulf Coast Association of Geological Sciences, Texas A&M University and the Texas Institute of Oceanography is gratefully acknowledged. Cooperation of numerous landowners in allowing access to field sites is also appreciated. Thanks are also extended to Mr. Chris Courtney for assisting in field and laboratory work, Dr. Timothy Dellapenna, Ms. Kimberly Schindler and Ms. M. Michaele Cerf for laboratory assistance and to the anonymous reviewers for contributing to the improvement of this manuscript.
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Yeager, K.M., Santschi, P.H., Phillips, J.D. et al. Suspended sediment sources and tributary effects in the lower reaches of a coastal plain stream as indicated by radionuclides, Loco Bayou, Texas. Env Geol 47, 382–395 (2005). https://doi.org/10.1007/s00254-004-1162-5
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DOI: https://doi.org/10.1007/s00254-004-1162-5