Articles | Volume 23, issue 7
https://doi.org/10.5194/bg-23-2477-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-2477-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
15 Apr 2026
Research article |
| 15 Apr 2026
| 15 Apr 2026
Worms and storms: shedding light on bioturbation and physical mixing on an intertidal flat by combining multiple tracers
Tjitske J. Kooistra
CORRESPONDING AUTHOR
Royal Netherlands Institute for Sea Research, Department of Estuarine and Delta Systems, Korringaweg 7, 4401 NT Yerseke, the Netherlands
Faculty of Geoscience, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, the Netherlands
Anna-Maartje de Boer
Wageningen University and Research, Soil Geography and Landscape group & Netherlands Centre for Luminescence dating, Droevendaalsesteeg 3, 6708 PB Wageningen, the Netherlands
Tjeerd J. Bouma
Royal Netherlands Institute for Sea Research, Department of Estuarine and Delta Systems, Korringaweg 7, 4401 NT Yerseke, the Netherlands
Faculty of Geoscience, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, the Netherlands
Natascia Pannozzo
Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, the Netherlands
Stuart G. Pearson
Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, the Netherlands
Ad van der Spek
Deltares, Boussinesqweg 1, 2629 HV Delft, the Netherlands
Henko de Stigter
Royal Netherlands Institute for Sea Research, Department of Ocean Systems, Landsdiep 4, 1797 SZ 't Horntje, the Netherlands
Jakob Wallinga
Wageningen University and Research, Soil Geography and Landscape group & Netherlands Centre for Luminescence dating, Droevendaalsesteeg 3, 6708 PB Wageningen, the Netherlands
Rob Witbaard
Royal Netherlands Institute for Sea Research, Department of Estuarine and Delta Systems, Korringaweg 7, 4401 NT Yerseke, the Netherlands
Karline Soetaert
Royal Netherlands Institute for Sea Research, Department of Estuarine and Delta Systems, Korringaweg 7, 4401 NT Yerseke, the Netherlands
Faculty of Geoscience, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, the Netherlands
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Geosci. Model Dev., 19, 2137–2175, https://doi.org/10.5194/gmd-19-2137-2026, https://doi.org/10.5194/gmd-19-2137-2026, 2026
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This paper describes the ocean BiogeochemicAl Model for Hypoxic and Benthic Influenced areas (BAMHBI). BAMHBI is a moderate complexity marine biogeochemical model that describes the cycling of carbon, nitrogen, phosphorus, silicon and oxygen through the marine foodweb. BAMHBI is a stand-alone biogeochemical model that can be coupled to any hydrodynamical model and is particularly appropriate for modelling low oxygen environments and the generation of sulfidic waters.
Evert de Froe, Christian Mohn, Karline Soetaert, Anna-Selma van der Kaaden, Gert-Jan Reichart, Laurence H. De Clippele, Sandra R. Maier, and Dick van Oevelen
Ocean Sci., 22, 843–870, https://doi.org/10.5194/os-22-843-2026, https://doi.org/10.5194/os-22-843-2026, 2026
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Cold-water corals are important reef-building animals in the deep sea and are distributed globally. Until now, scientists have been mapping and predicting where cold-water corals can be found using video transects and statistical models. This study provides the first process-based model in which corals are predicted based on ocean currents and food particle movement. The results show that resupply of food by tidal currents near the seafloor is crucial for predicting where corals can grow.
Marius Buydens, Emil De Borger, Lorenz Meire, Samuel Bodé, Antonio Schirone, Karline Soetaert, Ann Vanreusel, and Ulrike Braeckman
Biogeosciences, 23, 1159–1179, https://doi.org/10.5194/bg-23-1159-2026, https://doi.org/10.5194/bg-23-1159-2026, 2026
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Robert McCall, Curt Storlazzi, Floortje Roelvink, Stuart G. Pearson, Roel de Goede, and José A. Á. Antolínez
Nat. Hazards Earth Syst. Sci., 24, 3597–3625, https://doi.org/10.5194/nhess-24-3597-2024, https://doi.org/10.5194/nhess-24-3597-2024, 2024
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Accurate predictions of wave-driven flooding are essential to manage risk on low-lying, reef-lined coasts. Models to provide this information are, however, computationally expensive. We present and validate a modeling system that simulates flood drivers on diverse and complex reef-lined coasts as competently as a full-physics model but at a fraction of the computational cost to run. This development paves the way for application in large-scale early-warning systems and flood risk assessments.
Jungyu Choi, Roy van Beek, Elizabeth L. Chamberlain, Tony Reimann, Harm Smeenge, Annika van Oorschot, and Jakob Wallinga
SOIL, 10, 567–586, https://doi.org/10.5194/soil-10-567-2024, https://doi.org/10.5194/soil-10-567-2024, 2024
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This research applies luminescence dating methods to a plaggic anthrosol in the eastern Netherlands to understand the formation history of the soil. To achieve this, we combined both quartz and feldspar luminescence dating methods. We developed a new method for feldspar to largely avoid the problem occurring from poorly bleached grains by examining two different signals from a single grain. Through our research, we were able to reconstruct the timing and processes of plaggic anthrosol formation.
Anna-Selma van der Kaaden, Dick van Oevelen, Christian Mohn, Karline Soetaert, Max Rietkerk, Johan van de Koppel, and Theo Gerkema
Ocean Sci., 20, 569–587, https://doi.org/10.5194/os-20-569-2024, https://doi.org/10.5194/os-20-569-2024, 2024
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Cold-water corals (CWCs) and tidal waves in the interior of the ocean have been connected in case studies. We demonstrate this connection globally using hydrodynamic simulations and a CWC database. Internal-tide generation shows a similar depth pattern with slope steepness and latitude as CWCs. Our results suggest that internal-tide generation can be a useful predictor of CWC habitat and that current CWC habitats might change following climate-change-related shoaling of internal-tide generation.
Anna-Selma van der Kaaden, Sandra R. Maier, Siluo Chen, Laurence H. De Clippele, Evert de Froe, Theo Gerkema, Johan van de Koppel, Furu Mienis, Christian Mohn, Max Rietkerk, Karline Soetaert, and Dick van Oevelen
Biogeosciences, 21, 973–992, https://doi.org/10.5194/bg-21-973-2024, https://doi.org/10.5194/bg-21-973-2024, 2024
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Combining hydrodynamic simulations and annotated videos, we separated which hydrodynamic variables that determine reef cover are engineered by cold-water corals and which are not. Around coral mounds, hydrodynamic zones seem to create a typical reef zonation, restricting corals from moving deeper (the expected response to climate warming). But non-engineered downward velocities in winter (e.g. deep winter mixing) seem more important for coral reef growth than coral engineering.
Anna-Maartje de Boer, Wolfgang Schwanghart, Jürgen Mey, Basanta Raj Adhikari, and Tony Reimann
Geochronology, 6, 53–70, https://doi.org/10.5194/gchron-6-53-2024, https://doi.org/10.5194/gchron-6-53-2024, 2024
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This study tested the application of single-grain feldspar luminescence for dating and reconstructing sediment dynamics of an extreme mass movement event in the Himalayan mountain range. Our analysis revealed that feldspar signals can be used to estimate the age range of the deposits if the youngest subpopulation from a sample is retrieved. The absence of clear spatial relationships with our bleaching proxies suggests that sediments were transported under extremely limited light exposure.
Caroline Ulses, Claude Estournel, Patrick Marsaleix, Karline Soetaert, Marine Fourrier, Laurent Coppola, Dominique Lefèvre, Franck Touratier, Catherine Goyet, Véronique Guglielmi, Fayçal Kessouri, Pierre Testor, and Xavier Durrieu de Madron
Biogeosciences, 20, 4683–4710, https://doi.org/10.5194/bg-20-4683-2023, https://doi.org/10.5194/bg-20-4683-2023, 2023
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Deep convection plays a key role in the circulation, thermodynamics, and biogeochemical cycles in the Mediterranean Sea, considered to be a hotspot of biodiversity and climate change. In this study, we investigate the seasonal and annual budget of dissolved inorganic carbon in the deep-convection area of the northwestern Mediterranean Sea.
Jürgen Mey, Wolfgang Schwanghart, Anna-Maartje de Boer, and Tony Reimann
Geochronology, 5, 377–389, https://doi.org/10.5194/gchron-5-377-2023, https://doi.org/10.5194/gchron-5-377-2023, 2023
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This study presents the results of an outdoor flume experiment to evaluate the effect of turbidity on the bleaching of fluvially transported sediment. Our main conclusions are that even small amounts of sediment lead to a substantial change in the intensity and frequency distribution of light within the suspension and that flow turbulence is an important prerequisite for bleaching grains during transport.
Cindy Quik, Ype van der Velde, Jasper H. J. Candel, Luc Steinbuch, Roy van Beek, and Jakob Wallinga
Biogeosciences, 20, 695–718, https://doi.org/10.5194/bg-20-695-2023, https://doi.org/10.5194/bg-20-695-2023, 2023
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In NW Europe only parts of former peatlands remain. When these peatlands formed is not well known but relevant for questions on landscape, climate and archaeology. We investigated the age of Fochteloërveen, using radiocarbon dating and modelling. Results show that peat initiated at several sites 11 000–7000 years ago and expanded rapidly 5000 years ago. Our approach may ultimately be applied to model peat ages outside current remnants and provide a view of these lost landscapes.
Stanley I. Nmor, Eric Viollier, Lucie Pastor, Bruno Lansard, Christophe Rabouille, and Karline Soetaert
Geosci. Model Dev., 15, 7325–7351, https://doi.org/10.5194/gmd-15-7325-2022, https://doi.org/10.5194/gmd-15-7325-2022, 2022
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The coastal marine environment serves as a transition zone in the land–ocean continuum and is susceptible to episodic phenomena such as flash floods, which cause massive organic matter deposition. Here, we present a model of sediment early diagenesis that explicitly describes this type of deposition while also incorporating unique flood deposit characteristics. This model can be used to investigate the temporal evolution of marine sediments following abrupt changes in environmental conditions.
Kaveh Purkiani, Matthias Haeckel, Sabine Haalboom, Katja Schmidt, Peter Urban, Iason-Zois Gazis, Henko de Stigter, André Paul, Maren Walter, and Annemiek Vink
Ocean Sci., 18, 1163–1181, https://doi.org/10.5194/os-18-1163-2022, https://doi.org/10.5194/os-18-1163-2022, 2022
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Based on altimetry data and in situ hydrographic observations, the impacts of an anticyclone mesoscale eddy (large rotating body of water) on the seawater characteristics were investigated during a research campaign. The particular eddy presents significant anomalies on the seawater properties at 1500 m. The potential role of eddies in the seafloor and its consequential effect on the altered dispersion of mining-related sediment plumes are important to assess future mining operations.
Xue Chen, Zeng Zhou, Qiang He, Heyue Zhang, Tjeerd Bouma, Zheng Gong, Ian Townend, and Changkuan Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2022-280, https://doi.org/10.5194/egusphere-2022-280, 2022
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We carry out a two-year continuous observation in the northern Jiangsu Coast. Our results show that: The distribution of crab burrows was unimodal across the shore in cold seasons, and bimodal in warm seasons. The density of crab burrows was lower in sites with stronger hydrodynamics and lower suspended sediment concentration. The governing factors of crab burrow distribution in cold seasons were organic matter content and soil salinity, while in warm seasons water content also played a role.
Olivier Gourgue, Jim van Belzen, Christian Schwarz, Wouter Vandenbruwaene, Joris Vanlede, Jean-Philippe Belliard, Sergio Fagherazzi, Tjeerd J. Bouma, Johan van de Koppel, and Stijn Temmerman
Earth Surf. Dynam., 10, 531–553, https://doi.org/10.5194/esurf-10-531-2022, https://doi.org/10.5194/esurf-10-531-2022, 2022
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There is an increasing demand for tidal-marsh restoration around the world. We have developed a new modeling approach to reduce the uncertainty associated with this development. Its application to a real tidal-marsh restoration project in northwestern Europe illustrates how the rate of landscape development can be steered by restoration design, with important consequences for restored tidal-marsh resilience to increasing sea level rise and decreasing sediment supply.
Justin C. Tiano, Jochen Depestele, Gert Van Hoey, João Fernandes, Pieter van Rijswijk, and Karline Soetaert
Biogeosciences, 19, 2583–2598, https://doi.org/10.5194/bg-19-2583-2022, https://doi.org/10.5194/bg-19-2583-2022, 2022
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This study gives an assessment of bottom trawling on physical, chemical, and biological characteristics in a location known for its strong currents and variable habitats. Although trawl gears only removed the top 1 cm of the seabed surface, impacts on reef-building tubeworms significantly decreased carbon and nutrient cycling. Lighter trawls slightly reduced the impact on fauna and nutrients. Tubeworms were strongly linked to biogeochemical and faunal aspects before but not after trawling.
Alice E. Webb, Didier M. de Bakker, Karline Soetaert, Tamara da Costa, Steven M. A. C. van Heuven, Fleur C. van Duyl, Gert-Jan Reichart, and Lennart J. de Nooijer
Biogeosciences, 18, 6501–6516, https://doi.org/10.5194/bg-18-6501-2021, https://doi.org/10.5194/bg-18-6501-2021, 2021
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The biogeochemical behaviour of shallow reef communities is quantified to better understand the impact of habitat degradation and species composition shifts on reef functioning. The reef communities investigated barely support reef functions that are usually ascribed to conventional coral reefs, and the overall biogeochemical behaviour is found to be similar regardless of substrate type. This suggests a decrease in functional diversity which may therefore limit services provided by this reef.
Chiu H. Cheng, Jaco C. de Smit, Greg S. Fivash, Suzanne J. M. H. Hulscher, Bas W. Borsje, and Karline Soetaert
Earth Surf. Dynam., 9, 1335–1346, https://doi.org/10.5194/esurf-9-1335-2021, https://doi.org/10.5194/esurf-9-1335-2021, 2021
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Shells are biogenic particles that are widespread throughout natural sandy environments and can affect the bed roughness and seabed erodibility. As studies are presently lacking, we experimentally measured ripple formation and migration using natural sand with increasing volumes of shell material under unidirectional flow in a racetrack flume. We show that shells expedite the onset of sediment transport, reduce ripple dimensions and slow their migration rate.
Emil De Borger, Justin Tiano, Ulrike Braeckman, Adriaan D. Rijnsdorp, and Karline Soetaert
Biogeosciences, 18, 2539–2557, https://doi.org/10.5194/bg-18-2539-2021, https://doi.org/10.5194/bg-18-2539-2021, 2021
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Bottom trawling alters benthic mineralization: the recycling of organic material (OM) to free nutrients. To better understand how this occurs, trawling events were added to a model of seafloor OM recycling. Results show that bottom trawling reduces OM and free nutrients in sediments through direct removal thereof and of fauna which transport OM to deeper sediment layers protected from fishing. Our results support temporospatial trawl restrictions to allow key sediment functions to recover.
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Short summary
On intertidal flats, it is hard to distinguish sediment mixing by animals from reworking by waves and currents. We combined tracers to identify reworking of grains of different sizes on the short- and long term. Coarse (sand) grains were less mobile than fine (mud) grains, and partly kept their layering after deposition. The luminescence properties of sand grains can be used for sediment dating and can show sediment mixing, but this method needs to be tested more for young, intertidal sediments.
On intertidal flats, it is hard to distinguish sediment mixing by animals from reworking by...
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