Internal waves and intense mixing periods in a partially stratified estuary |
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| Affiliation: | 1. Theoretical, Metacommunity and Landscape Ecology Laboratory, ICB-V, Universidade Federal de Goiás, Av. Esperança, Goiânia 74690-000, Goiás, Brazil;2. Département de phytologie, Université Laval, 2325 Rue de l''Université, Québec GV1 0A6, QC, Canada;3. Instituto de Biología Subtropical, Consejo Nacional de Investigaciones Científicas y Técnicas -Universidad Nacional de Misiones, Puerto Iguazú N3370BFA, Misiones, Argentina;1. Instituto de Astronomía y Física del Espacio (IAFE), CONICET/UBA, Argentina;2. Royal Belgian Institute for Natural Sciences (RBINS), Operational Directorate Natural Environment, Belgium;3. Laboratoire d''Océanographie de Villefranche (LOV), UMR 7093, CNRS/UPMC, France;4. Flemish Institute for Technological Research (VITO), Belgium;1. Joint Laboratory of Guangdong Province and Hong Kong Region on Marine Bioresource Conservation and Exploitation, College of Marine Sciences, South China Agricultural University, 510642 Guangzhou, China;2. Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, College of Marine Sciences, Beibu Gulf University, Qinzhou 535011, China;3. Liaoning Key Lab of Germplasm Improvement and Fine Seed Breeding of Marine Aquatic animals, Liaoning Ocean and Fisheries Science Research Institute, Dalian 116023, China |
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| Abstract: | The results of an echo-sounding survey of the Tees estuary are presented. Intense mixing periods, characterized by a surface layer of increasing salinity and thickness, were observed on the ebb tide and were preceded by periods of internal wave activity. Previously, it had been conjectured that similar mixing periods were caused by the breaking of upstream-travelling internal waves. The present survey, however, reveals that the observed waves were travelling down-stream and indicates that the mixing was principally due to a series of bridges. The times of the onset of mixed water at various stations in the estuary were consistent with the production of mixing from about the time of high water, with subsequent advection downstream. The mixing produced in this way, and by similar structures in other estuaries, clearly needs to be quantified. |
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