TY - JOUR
T1 - The influence of aggregation on cohesive sediment erosion and settling
AU - Forsberg, P.L.
AU - Skinnebach, K.H.
AU - Becker, M.
AU - Ernstsen, V.B.
AU - Kroon, A.
AU - Andersen, T.J.
N1 - Funding Information:
The authors would like to thank divers Paul Christiansen and Per Freiberg for their help in the field. Nils Drønen, Ulrik Lumborg and Bjarne Holm Jakobsen are thanked for fruitful discussions during the manuscript preparation. Comments and suggestions by two anonymous reviewers and the editor were greatly appreciated. The study was carried out within the collaborative research project “SEDILINK - Flow circulation and sediment dynamics in a non-tidal coastal lagoonal system - Rødsand lagoon, Denmark” co-funded by the University of Copenhagen, DHI and Femern A/S.
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/12/1
Y1 - 2018/12/1
N2 - The influence of aggregation on cohesive sediment erosion and settling was investigated in a semi-enclosed coastal lagoon with a bed consisting of sediment in the clay to sand size range. Cores of bed material and seawater were used for ex situ laboratory experiments investigating the erosion of the sediment bed and the settling of aggregates. The results showed that the cohesive bed was primarily eroded as aggregates and aggregation was the major contributor to the formation of microflocs in the system. The aggregates eroded from the bed were relatively stable up to a bed shear stress level of at least 0.5 N m−2. The eroded aggregates displayed high settling velocities relative to the aggregate sizes in comparison to previous water column studies from similar environments. Since high settling velocities limit the advective transport, the erosion of aggregates potentially plays a significant role for the cohesive sediment dynamics of a coastal system. The impact of aggregation on cohesive sediment erosion and settling is important to understand in order to improve general understanding of coastal environments and to strengthen the reproduction of cohesive sediment dynamics in numerical models.
AB - The influence of aggregation on cohesive sediment erosion and settling was investigated in a semi-enclosed coastal lagoon with a bed consisting of sediment in the clay to sand size range. Cores of bed material and seawater were used for ex situ laboratory experiments investigating the erosion of the sediment bed and the settling of aggregates. The results showed that the cohesive bed was primarily eroded as aggregates and aggregation was the major contributor to the formation of microflocs in the system. The aggregates eroded from the bed were relatively stable up to a bed shear stress level of at least 0.5 N m−2. The eroded aggregates displayed high settling velocities relative to the aggregate sizes in comparison to previous water column studies from similar environments. Since high settling velocities limit the advective transport, the erosion of aggregates potentially plays a significant role for the cohesive sediment dynamics of a coastal system. The impact of aggregation on cohesive sediment erosion and settling is important to understand in order to improve general understanding of coastal environments and to strengthen the reproduction of cohesive sediment dynamics in numerical models.
UR - http://www.scopus.com/inward/record.url?scp=85056228772&partnerID=8YFLogxK
U2 - 10.1016/j.csr.2018.10.005
DO - 10.1016/j.csr.2018.10.005
M3 - Article
AN - SCOPUS:85056228772
SN - 0278-4343
VL - 171
SP - 52
EP - 62
JO - Continental Shelf Research
JF - Continental Shelf Research
ER -