TY - JOUR
T1 - Modeling tidal sand wave recovery after dredging
T2 - effect of different types of dredging strategies
AU - Campmans, G.H.P.
AU - Roos, P.C.
AU - van der Sleen, N.R.
AU - Hulscher, S.J.M.H.
N1 - Elsevier deal
Funding Information:
This work is part of the research programme SMARTSEA with project number 13275, which is (partly) financed by the Netherlands Organization for Scientific Research (NWO). The authors thank Ad Stolk from Rijkswaterstaat Zee en Delta for discussions on this work.
Publisher Copyright:
© 2021 The Author(s)
PY - 2021/4/1
Y1 - 2021/4/1
N2 - Maintenance of navigation channels in shelf seas with tidal sand waves usually requires repeated dredging operations. Optimizing these interventions is a difficult task, particularly complicated by the nonlinear morphodynamics of sand wave recovery after dredging. Here we present a process-based model study, incorporating different strategies of dredging in an existing nonlinear sand wave model. We consider ‘topping’ (removing sand from crest) and ‘swiping’ (same, but now placing it in the troughs), for a range of dredging depths. Starting point is a fully developed sand wave or sand wave field, as simulated in the model. Results indicate that sand wave recovery is slowest after swiping. Also, larger dredging volumes imply longer recovery times. Next, we study the maintenance intervals and (cumulative) dredging volumes resulting from adopting a typical temporal strategy: swipe to a prescribed dredging depth, as soon as the recovering sand wave crests have reached a critical depth. Maintenance intervals are found to depend on the dredging depth and, importantly, to vary over time, as well. This last result shows that sand wave recovery depends not only on height, but also on its shape, emphasizing the limitations of existing, empirical (Landau-type of) models based on amplitude (or height) only.
AB - Maintenance of navigation channels in shelf seas with tidal sand waves usually requires repeated dredging operations. Optimizing these interventions is a difficult task, particularly complicated by the nonlinear morphodynamics of sand wave recovery after dredging. Here we present a process-based model study, incorporating different strategies of dredging in an existing nonlinear sand wave model. We consider ‘topping’ (removing sand from crest) and ‘swiping’ (same, but now placing it in the troughs), for a range of dredging depths. Starting point is a fully developed sand wave or sand wave field, as simulated in the model. Results indicate that sand wave recovery is slowest after swiping. Also, larger dredging volumes imply longer recovery times. Next, we study the maintenance intervals and (cumulative) dredging volumes resulting from adopting a typical temporal strategy: swipe to a prescribed dredging depth, as soon as the recovering sand wave crests have reached a critical depth. Maintenance intervals are found to depend on the dredging depth and, importantly, to vary over time, as well. This last result shows that sand wave recovery depends not only on height, but also on its shape, emphasizing the limitations of existing, empirical (Landau-type of) models based on amplitude (or height) only.
KW - UT-Hybrid-D
U2 - 10.1016/j.coastaleng.2021.103862
DO - 10.1016/j.coastaleng.2021.103862
M3 - Article
VL - 165
JO - Coastal engineering
JF - Coastal engineering
SN - 0378-3839
M1 - 103862
ER -