XIII ENES - Encontro Nacional de Engenharia de Sedimentos e I PiA - Partículas nas Américas (Particles in the Americas)

Data: 24/09/2018 à 28/09/2018
Local: Vitória-ES
ISSN: 2359-2141
Mais informações: https://www.abrh.org.br/xiiienes/

PREDICTING STREAMBANK EROSION RATES AND INSTABILITIES IN INCISED STREAMS USING THE MODEL CONCEPTS

Autores

John J. Ramirez-Avila, Eddy J. Langendoen, William H. McAnally, James L. Martin, Sandra L. Ortega Achury, Ron L. Bingner

Tema

MEDIÇÃO, MODELAGEM, TÉCNICAS E TECNOLOGIAS NO CONTEXTO DA HIDROSSEDIMENTOLOGIA

Resumo

TheabilityoftheCONCEPTSmodeltopredictstreambankerosionindisturbedstreamswastestedthroughitsapplicationtoa270?mreachalongtheYonabaCreekinMississippi,USA.Modelpredictionswerecomparedwithcrosssectionresurveysof8transectsalongthemodelingreachfora13?monthperiod(February2009toMarch2010).Streambankgravitationalfailurewasthedominantmechanisminducingstreambankerosionforthestudiedreach.ResultsshowedthatCONCEPTSwasaccurateinpredictingtopwidthretreatandstreambankfailuresintimeandmagnitude.CONCEPTSsimulationyieldedstreambankdegradationpredictionscomparabletothoseobservedduringthestudiedperiod.Amaximumannualwideningrateofabout3.62?mandannualstreambanksedimentloadofabout2,000?Mgofstreambankmaterialwereassessedbybothmethods;fieldmeasurementsandCONCEPTSmodeling.However,CONCEPTSdidnotaccountforsedimentdepositionthatoccurredonthestreambank,aconditionthatslightlyreducedtheobservednetamountofsedimentyieldcontributedbyin?streamprocesses.CONCEPTSisatoolcapabletosupportdecisionmakingregardingreductionofsedimentloads,especiallyforassessmentofin?streammanagementprocessesandevaluationofstabilizationoferodingstreambanksand/orstreamrestorationdesigns.

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