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Hydrodynamics and suspended particulate matter retention in macrotidal estuaries located in amazonia-semiarid interface(Northeastern-Brazil)

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International Journal of Sediment Research 2020年第4期35卷 417-429页

作者： Vinicius Henrique Maciel dos Santos Francisco Jose da Silva Dias Audalio Rebelo Torres Romulo Araujo Soares Lais Costa Terto Antonio Carlos Leal de Castro Ricardo Luvizotto Santos Marco Valerio Jansen Cutrim Laboratorio de Hidrodinamica Costeira Estuarina e de Aguas Interiores (LHiCEAI) Do Programa de Pos-Graduacao Em Oceanografia (PPGOceano) da Universidade Federal Do Maranhao (UFMA)Cidade Universitaria Dom Delgado Laboratorio de Ictiologia (LabIctio) da Universidade Federal Do Maranhao (UFMA) Cidade Universitaria Dom Delgado Laboratorio de Ecotoxicologia (LabEcotox) Do Programa de Pos-Graduacao Em Oceanografia (PPGOceano) da Universidade Federal Do Maranhao (UFMA) Cidade Universitaria Dom Delgado Laboratorio de Ficologia (LabFic) Do Programa de Pos-Graduacao Em Oceanografia (PPGOceano) da Universidade Federal Do Maranhao (UFMA) Cidade Universitaria Dom Delgado

The aim of the current study was to determine the nature of the seasonal variability of the Suspended Particulate Matter(SPM) fluxes from the drainage basin to the estuary in a macrotidal region(Northeastern Brazil),and the estuarine response to a seawater intrusion regarding sediment deposition,which will support the understanding of the global transport of materials at the continent-ocean interface.Thermohaline structure data was acquired using a Conductivity,Temperature,and Depth(CTD) probe with a sampling frequency of 4 Hz.Suspended particulate material was measured by gravimetric measurements applied to exact filtered volume samples.The outflows were measured through the use of an Acoustic Doppler Current Profiler(ADCP) with frequency of 1.5 MHz.The horizontal thermal and saline gradients varied from warmer and less saline waters(2014) to cooler and saline waters(2015).The gradient behavior when linked to volume transport and SPM flows,suggests a minimization of the fluvial flows in 2015,easing the advance of coastal water(CW) towards the inner estuary,leading to an inversion of the baroclinic pressure gradient.The bottom saline front,generated by the entrance of coastal water masses,caused an increase in SPM concentrations due to increased fluid density,resuspension of previously deposited sediment,and erosion of banks.High concentrations of SPM indicate higher volume transport suggesting a hydraulic barrier due to the change/inversion of the baroclinic pressure gradient,resulting in water and material retention.Material deposition was observed during neap tide,while during spring tide the material is resuspended,increasing the concentration,generating cycles of deposition and erosion during the neap-spring tides.The sediment in suspension that reach the estuary,even with low fluvial volume,stay in this environment forming new islands because of deposition.High deposition rates or sediment cycling,if generated by the hydraulic barrier,may indicate that the flows of SPM from the continental drainage to the e

关键词： brazilian amazonia Materials discharges Macrotidal estuaries Freshwater percentage Residence time

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