Resumo

RODRIGUEZ-BASTARMERITO, Roberto et al. Suspended sediment rate due to effects of a lateral spillway in a plain river. Ecosistemas y recur. agropecuarios [online]. 2018, vol.5, n.14, pp.283-291. ISSN 2007-901X.  https://doi.org/10.19136/era.a5nl4.1418.

Diversion canals and lateral spillways in a plain river divert surplus liquid flows, reducing the levels and avoiding the overflow of the channels, which mitigates flooding. The objective of the study was to determine the suspended sediment rate due to the effects of a lateral spillway in a plain river. The operation of these structures changes the behavior of the liquid flow and the sediments that it transports in suspension, causing changes in the morphology and hydrodynamics of the channel. A RiverRay Acoustic Doppler Current Profiler (ADCP) and a US-DH59 depth-integrating suspended sediment sampler were used to measure the liquid and solid flows in the Sierra River in the State of Tabasco, Mexico and in the El Censo lateral spillway. The data obtained in the field were used to evaluate the effects of the lateral spillway on the hydrodynamics and morphology of the channel. The results show a 109.4% increase in the sediment rate in the flow downstream of the spillway and geomorphological imbalance, which denote an alteration to the natural behavior of the biphasic flow composed of a liquid flow phase and a sediment flow one.

Palavras-chave : Biphasic flow; floods; hydrodynamics; morphology; sediment transport.