Material transport from the nearshore to the basinal environment in the southern Baltic Sea: I. Processes and mass estimates

C. Christiansen, Karen Edelvang, K. Emeis, G. Graf, S. Jahmlich, J. Kozuch, M. Laima, T. Leipe, A. Loffler, L.C. Lund-Hansen, A. Miltner, K. Pazdro, J. Pempkowiak, G. Shimmield, J. Smith, M. Voss, G. Witt

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Processes involved in erosion, transport and deposition of cohesive materials are studied in a transect from shallow (16 m) to deep (47 m) water of the SW Baltic Sea. The wave- and current-induced energy input to the seabed in shallow water is high with strong variability and suspended matter concentrations may double within a few hours. Primary settling fluxes (from sedimentation traps) are less than 10 g m (-2) day (-1), whereas resuspension fluxes (evaluated from sedimentation flux gradients) are 15-20 times higher and the residence time for suspended matter in the water column is 1-2 days. Settling velocities of aggregates are on average six times higher than for individual particles resulting in an enhanced downward transport of organic matter. Wave-induced resuspension (four to six times per month) takes place with higher shear stresses on the bottom than current-induced resuspension (three to five times per month). The short residence time in the water column and the frequent resuspension events provide a fast operating benthic-pelagic coupling. Due to the high-energy input, the shallow water areas are nondepositional on time scales longer than 1-2 weeks. The sediment is sand partly covered by a thin fluff layer during low-energy periods. The presence of the fluff layer keeps the resuspension threshold very low (
Original languageEnglish
JournalJournal of Marine Systems
Volume35
Issue number3-4
Pages (from-to)133-150
ISSN0924-7963
DOIs
Publication statusPublished - 2002
Externally publishedYes

Keywords

  • GEOSCIENCES,
  • MARINE
  • OCEANOGRAPHY
  • BENTHIC BOUNDARY-LAYER
  • CONTINENTAL-MARGIN
  • SEDIMENT RESUSPENSION
  • SETTLING VELOCITY
  • POMERANIAN-BIGHT
  • SATELLITE DATA
  • ODER RIVER
  • WATER
  • DYNAMICS
  • INSTRUMENT
  • sediment dynamics
  • aggregates
  • sedimentation
  • resuspension
  • material transport
  • models
  • Baltic Sea
  • Pomeranian Bight
  • Aquatic Science
  • Oceanography
  • Aggregates
  • Material transport
  • Models
  • Resuspension
  • Sediment dynamics
  • Sedimentation
  • Particles (particulate matter)
  • Sediment transport
  • Shear stress
  • Suspensions (fluids)
  • Mass estimations
  • deposition
  • erosion
  • sediment transport
  • three-dimensional modeling
  • T

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