Cristin-resultat-ID: 1972990
Sist endret: 13. mars 2022, 16:21
NVI-rapporteringsår: 2021
Resultat
Vitenskapelig artikkel
2021

The residual circulation profile of the Bons Sinais Estuary in central Mozambique - potential implications for larval dispersal and fisheries

Bidragsytere:
  • Antonio Mubango Hoguane
  • Tor Gammelsrød
  • Noca bernardo Furaca da silva
  • Anabela C. Cafermane og
  • Maria helena Antonio

Tidsskrift

Western Indian Ocean Journal of Marine Science
ISSN 0856-860X
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2021
Publisert online: 2021
Trykket: 2021
Volum: Special Issue
Hefte: 1
Sider: 17 - 27

Beskrivelse Beskrivelse

Tittel

The residual circulation profile of the Bons Sinais Estuary in central Mozambique - potential implications for larval dispersal and fisheries

Sammendrag

The residual circulation in estuaries determines the net exchange of water, heat, salt, fine sediments and drifting biological organisms between estuarine and nearshore marine waters. The Bons Sinais Estuary in central Mozam¬bique is ~ 30 km long with the city of Quelimane and an industrial port on the northern bank of its upper reaches. To investigate residual circulation in the estuary, seasonal (wet, dry and transition season) CTD profiling data were collected at 11 fixed stations between the upper estuary and mouth, and vertical current profiles were measured over a full tidal cycle at a fixed mid-estuary station. Strong longitudinal gradients in salinity and density indicated that the estuary was river-dominated during the wet season and tide-dominated during the dry season, but the water column remained partially mixed. Tidally averaged vertical profiles from the mid-estuary station revealed: uniform vertical temperatures, warmest during the wet season; depth-stratified salinity during the wet season, but uniform profiles during the dry and transition seasons with highest salinity during the dry season when the density was also highest. The density was uniform and somewhat lower in the transition season, and in the wet season the density was even lower, but stratified. The vertical velocity profile showed a classical two-layer circulation model, with downstream flow intensifying at the surface, and upstream flow at the bottom, during the wet and transitory seasons, when fresh¬water discharges into the estuary. The flow velocities obtained from a calibrated Hansen and Rattray model fitted the observed data well, confirming that a simplified modelling approach is adequate to describe the residual flow of the Bons Sinais Estuary. The residual circulation model provides insights useful for fisheries research and predicting the spread of water-borne pollutants in the estuary.

Bidragsytere

Antonio Mubango Hoguane

  • Tilknyttet:
    Forfatter
    ved Universidade Eduardo Mondlane Maputo

Tor Gammelsrød

  • Tilknyttet:
    Forfatter
    ved Geofysisk institutt ved Universitetet i Bergen

Noca bernardo Furaca da silva

  • Tilknyttet:
    Forfatter
    ved Universidade Eduardo Mondlane Maputo

Anabela C. Cafermane

  • Tilknyttet:
    Forfatter
    ved Universidade Eduardo Mondlane Maputo

Maria helena Antonio

  • Tilknyttet:
    Forfatter
    ved Universidade Eduardo Mondlane Maputo
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