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Theo Gerkema
Utrecht University
OceanographyGeologyInternal waveClimatologyGeophysics
71Publications
17H-index
1,202Citations
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Publications 72
Newest
#1Marc Rovira-Navarro (TU Delft: Delft University of Technology)H-Index: 2
#2Theo Gerkema (UU: Utrecht University)H-Index: 17
Last. Bert Vermeersen (TU Delft: Delft University of Technology)H-Index: 15
view all 6 authors...
Abstract Tidal heating can play an important role in the formation and evolution of subsurface oceans of outer-planet moons. Up until now tidal heating has only been studied in subsurface oceans of spatially uniform thickness. We develop a numerical model to consider oceans of spatially variable thickness. We use the Laplace Tidal Equations for the ocean and model the ice shell using membrane theory. The problem is solved using the commercial Finite Element software Comsol Multiphysics®. We use ...
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#1Long Jiang (Hohai University)H-Index: 5
#2Theo Gerkema (UU: Utrecht University)H-Index: 17
Last. Karline Soetaert (UU: Utrecht University)H-Index: 53
view all 5 authors...
Abstract. Sea-level rise (SLR) not only increases the threat of coastal flooding, but may also change tidal regimes in estuaries and coastal bays. To investigate such nearshore tidal responses to SLR, a hydrodynamic model of the European Shelf is downscaled to a model of a Dutch coastal bay (the Oosterschelde, i.e., Eastern Scheldt) and forced by SLR scenarios ranging from 0 to 2 m. This way, the effect of SLR on tidal dynamics in the adjacent North Sea is taken into account as well. The model s...
Source
#1Long Jiang (Hohai University)H-Index: 5
#2Theo Gerkema (UU: Utrecht University)H-Index: 17
Last. Karline Soetaert (UU: Utrecht University)H-Index: 53
view all 6 authors...
Abstract. As the primary energy and carbon source in aquatic food webs, phytoplankton generally display spatial heterogeneity due to the complicated biotic and abiotic controls, but our understanding of its causes is challenging as it involves multiple regulatory mechanisms. We applied a combination of field observation, numerical modeling, and remote sensing to display and interpret the spatial gradient of phytoplankton biomass in a Dutch tidal bay (the Oosterschelde) on the east coast of the N...
Source
#1Long Jiang (Hohai University)H-Index: 5
#2Karline Soetaert (UU: Utrecht University)H-Index: 53
Last. Theo Gerkema (UU: Utrecht University)H-Index: 17
view all 3 authors...
Abstract Flushing timescales in estuaries and coastal bays largely shape the distribution of dissolved and particulate matter and therefore have important environmental implications. Here we investigate the spatiotemporal variability of turnover times in a semi-enclosed tidal bay and examine the potential underlying causes. The basin considered here is the Dutch coastal bay Oosterschelde (Eastern Scheldt in English) on the east coast of the North Sea. Using a calibrated and validated 3D hydrodyn...
2 CitationsSource
#1Long Jiang (UU: Utrecht University)H-Index: 1
#2Theo Gerkema (UU: Utrecht University)H-Index: 17
Last. Karline Soetaert (UU: Utrecht University)H-Index: 53
view all 5 authors...
Abstract. Sea-level rise (SLR) not only increases the threat of coastal flooding, but also may change tidal regimes in estuaries and coastal bays. To investigate such nearshore tidal responses to SLR, a hydrodynamic model of the European Shelf is downscaled to a model of a Dutch coastal bay (the Eastern Scheldt) and forced by SLR scenarios ranging from 0 to 2 m. The results indicate that SLR induces larger increases in tidal amplitude and stronger nonlinear tidal distortion in the bay compared t...
Source
#1Long JiangH-Index: 5
#2Theo GerkemaH-Index: 17
Last. Karline SoetaertH-Index: 53
view all 3 authors...
Flushing timescales in estuaries and coastal bays largely shape the distribution of dissolved and particulate matter and therefore have important environmental implications. Here we investigate the spatiotemporal variability of turnover times in a semi-enclosed tidal bay and examine the potential underlying causes. The basin considered here is the Dutch coastal bay Oosterschelde (Eastern Scheldt in English) on the east coast of the North Sea. Using a calibrated and validated 3D hydrodynamic mode...
#1Long Jiang (UU: Utrecht University)H-Index: 1
#2Theo Gerkema (UU: Utrecht University)H-Index: 17
Last. Karline Soetaert (UU: Utrecht University)H-Index: 53
view all 4 authors...
Abstract Shellfish cultures worldwide are often located in sheltered marine bays. The Oosterschelde is such a bay in the southwestern delta of the Netherlands, harboring extensive shellfish cultures, whose yield is partly driven by seston renewal from the North Sea. Tracer experiments performed with a three-dimensional hydrodynamic model were used to study the relative influences of benthic filtration and physical processes on seston replenishment. The model exhibited good skills in reproducing ...
1 CitationsSource
#1Marc Rovira-Navarro (TU Delft: Delft University of Technology)H-Index: 2
#2Michel Rieutord (University of Toulouse)H-Index: 24
Last. Bert Vermeersen (TU Delft: Delft University of Technology)H-Index: 3
view all 6 authors...
Some of the moons of the outer solar system harbour subsurface liquid oceans. Tidal dissipation plays an important role in preventing these oceans from freezing. In the past, most studies considered only tidal dissipation in the solid layers of these bodies (rock and ice). Recently, new studies considering tidal dissipation in the oceans of these moons have appeared. All of them make use of the shallow water approximation. However, the use of this approximation might not be adequate. Here we con...
5 CitationsSource
#1Martin J. Baptist (WUR: Wageningen University and Research Centre)H-Index: 12
#2Theo Gerkema (UU: Utrecht University)H-Index: 17
Last. M.E.B. van Puijenbroek (WUR: Wageningen University and Research Centre)H-Index: 1
view all 18 authors...
We test an innovative approach to beneficially re-use dredged sediment to enhance salt marsh development. A Mud Motor is a dredged sediment disposal in the form of a semi-continuous source of mud in a shallow tidal channel allowing natural processes to disperse the sediment to nearby mudflats and salt marshes. We describe the various steps in the design of a Mud Motor pilot: numerical simulations with a sediment transport model to explore suitable disposal locations, a tracer experiment to measu...
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#1Thomas Frederikse (California Institute of Technology)H-Index: 1
#2Theo Gerkema (UU: Utrecht University)H-Index: 17
Abstract. Seasonal deviations from annual-mean sea level in the North Sea region show a large low-frequency component with substantial variability at decadal and multi-decadal time scales. In this study, we quantify low-frequency seasonal variations from annual-mean sea level and look for drivers of this variability. The amplitude, as well as the temporal evolution of this multi-decadal variability shows substantial variations over the North Sea region, and this spatial pattern is similar to the...
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