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Title: On the relationship between suspended sediment concentration, rainfall variability and groundwater: An empirical and probabilistic analysis for the Andean Beni River, Bolivia (2003-2016)
Authors: Rivera, Irma Ayes
Poduje, Ana Claudia Callau
Molina-Carpio, Jorge
Ayala, José Max
Cardenas, Elisa Armijos
Espinoza-Villar, Raúl
Espinoza, J. C.
Gutierrez-Cori, Omar
Filizola, Naziano Pantoja
Keywords: Aerodynamics
Groundwater Flow
Hydrological Years
Probabilistic Analysis
Probabilistic Methods
Rainfall Variability
Sediment Discharge
Suspended Sediment Concentrations
Suspended Sediments
Concentration (composition)
Empirical Analysis
Fluvial Deposit
Groundwater Resources
Precipitation Intensity
Rating Curve
Suspended Sediment
Amazon River
Atlantic Ocean
Beni River
Madeira River
Issue Date: 2019
metadata.dc.publisher.journal: Water (Switzerland)
metadata.dc.relation.ispartof: Volume 11, Número 12
Abstract: Fluvial sediment dynamics plays a key role in the Amazonian environment, with most of the sediments originating in the Andes. The Madeira River, the second largest tributary of the Amazon River, contributes up to 50% of its sediment discharge to the Atlantic Ocean, most of it provided by the Andean part of the Madeira basin, in particular the Beni River. In this study, we assessed the rainfall (R)-surface suspended sediment concentration (SSSC) and discharge (Q)-SSSC relationship at the Rurrenabaque station (200 m a.s.l.) in the Beni Andean piedmont (Bolivia). We started by showing how the R and Q relationship varies throughout the hydrological year (September to August), describing a counter-clockwise hysteresis, and went on to evaluate the R-SSSC and Q-SSSC relationships. Although no marked hysteresis is observed in the first case, a clockwise hysteresis is described in the second. In spite of this, the rating curve normally used (SSSC = aQb) shows a satisfactory R2 = 0.73 (p < 0.05). With regard to water discharge components, a linear function relates the direct surface flow Qs-SSSC, and a hysteresis is observed in the relationship between the base flow Qb and SSSC. A higher base flow index (Qb/Q) is related to lower SSSC and vice versa. This article highlights the role of base flow on sediment dynamics and provides a method to analyze it through a seasonal empirical model combining the influence of both Qb and Qs, which could be employed in other watersheds. A probabilistic method to examine the SSSC relationship with R and Q is also proposed. © 2019 by the authors.
metadata.dc.identifier.doi: 10.3390/w11122497
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