TY - JOUR
T1 - Biological influences on morphology and bed composition of an intertidal flat
AU - Paarlberg, Andries
AU - Knaapen, Michiel
AU - de Vries, Mindert
AU - Hulscher, Suzanne J.M.H.
AU - Wang, Z.B.
PY - 2005
Y1 - 2005
N2 - Biological activity is known to influence sediment strength at bed-water interfaces. However, its precise effect on geomorphology and on bed composition is not known. This paper proposes a parameterization of sediment destabilizing and stabilizing organisms on three parameters that describe the erosion and mixing processes of the sediment bed, namely the critical bed shear stress, the erosion coefficient and the bioturbation coefficient. This parameterization is included in a 3D sand-mud morphodynamic model to form the sand-mud-bio model. The performance of the sand-mud-bio model is demonstrated by testing it on the Paulinapolder intertidal flat in the Western Scheldt estuary of The Netherlands. Model results show that biological influences on sediment strength result in significant morphological change and bed composition variations. Destabilizing organisms always cause a significant decrease in mud content in the bed and an increase of erosion. On the other hand, stabilizing organisms can, but do not necessarily, cause an increase of mud content and additional sedimentation.
AB - Biological activity is known to influence sediment strength at bed-water interfaces. However, its precise effect on geomorphology and on bed composition is not known. This paper proposes a parameterization of sediment destabilizing and stabilizing organisms on three parameters that describe the erosion and mixing processes of the sediment bed, namely the critical bed shear stress, the erosion coefficient and the bioturbation coefficient. This parameterization is included in a 3D sand-mud morphodynamic model to form the sand-mud-bio model. The performance of the sand-mud-bio model is demonstrated by testing it on the Paulinapolder intertidal flat in the Western Scheldt estuary of The Netherlands. Model results show that biological influences on sediment strength result in significant morphological change and bed composition variations. Destabilizing organisms always cause a significant decrease in mud content in the bed and an increase of erosion. On the other hand, stabilizing organisms can, but do not necessarily, cause an increase of mud content and additional sedimentation.
KW - METIS-217759
KW - IR-47370
U2 - 10.1016/j.ecss.2005.04.008
DO - 10.1016/j.ecss.2005.04.008
M3 - Article
SN - 0272-7714
VL - 64
SP - 577
EP - 590
JO - Estuarine, coastal and shelf science
JF - Estuarine, coastal and shelf science
IS - 4
ER -