Experimental and numerical analysis of underwater consolidation of dredged sediment: a case of study for the Marker Wadden
Dredged sediments, which are mud suspensions with concentrations exceeding the gelling point, are utilised in reclamation and Building with Nature projects. Beyond the gelling point, flocs occupy space and begin to form a network structure. This study investigates the impact of initial conditions, s...
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Frontiers Media S.A.
2024-12-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2024.1466650/full |
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| author | Maria Barciela-Rial Maria Barciela-Rial Barend A. P. van den Bosch Thijs van Kessel Jasper Griffioen Jasper Griffioen Johan C. Winterwerp |
| author_facet | Maria Barciela-Rial Maria Barciela-Rial Barend A. P. van den Bosch Thijs van Kessel Jasper Griffioen Jasper Griffioen Johan C. Winterwerp |
| author_sort | Maria Barciela-Rial |
| collection | DOAJ |
| description | Dredged sediments, which are mud suspensions with concentrations exceeding the gelling point, are utilised in reclamation and Building with Nature projects. Beyond the gelling point, flocs occupy space and begin to form a network structure. This study investigates the impact of initial conditions, specifically the concentration above the gelling point and the stress state, on the consolidation of dredged sediment. The sediment from Lake Markermeer in the Netherlands was studied, specifically in the context of the construction of the Marker Wadden wetland. Material parameters were determined using two distinct experimental methods: settling columns and Seepage Induced Consolidation (SIC) tests. The differences observed between the two sets of material parameters suggest that the stress history and plastic deformation during mixing may influence the results. These effects were analysed using a one-dimensional vertical (1DV) consolidation model. The computed profiles were then compared with the profiles measured using an Ultrasonic High Concentration Meter. An initial concentration of 558.1 g/l, achieved by remixing the equilibrium profile of a normally consolidated suspension, resulted in larger final densities and a lower sediment-water interface. Conversely, a concentration of 175.6 g/l, achieved by remixing consolidating dredged sediment, yielded the same equilibrium layer thickness and density profile as virgin consolidation, albeit after a longer consolidation time. These findings are particularly relevant for land reclamation and wetland construction projects, where the initial density may be high and the dredging process’s mixing may alter the stress state. |
| format | Article |
| id | doaj-art-bd51ea1895b04fb497ceb200a23ed413 |
| institution | Kabale University |
| issn | 2296-7745 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj-art-bd51ea1895b04fb497ceb200a23ed4132024-12-02T08:44:18ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452024-12-011110.3389/fmars.2024.14666501466650Experimental and numerical analysis of underwater consolidation of dredged sediment: a case of study for the Marker WaddenMaria Barciela-Rial0Maria Barciela-Rial1Barend A. P. van den Bosch2Thijs van Kessel3Jasper Griffioen4Jasper Griffioen5Johan C. Winterwerp6Built Environment Academy, HAN University of Applied Sciences, Arnhem, NetherlandsHydraulic Engineering, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, NetherlandsEnvironmental Engineering, Van Oord, Rotterdam, NetherlandsMarine and Coastal Systems, Deltares, Delft, NetherlandsCopernicus Institute of Sustainable Development, Faculty of Geosciences, Utrecht University, Utrecht, NetherlandsHydrology and Reservoir Engineering, TNO Geological Survey of the Netherlands, Utrecht, NetherlandsBuilt Environment Academy, HAN University of Applied Sciences, Arnhem, NetherlandsDredged sediments, which are mud suspensions with concentrations exceeding the gelling point, are utilised in reclamation and Building with Nature projects. Beyond the gelling point, flocs occupy space and begin to form a network structure. This study investigates the impact of initial conditions, specifically the concentration above the gelling point and the stress state, on the consolidation of dredged sediment. The sediment from Lake Markermeer in the Netherlands was studied, specifically in the context of the construction of the Marker Wadden wetland. Material parameters were determined using two distinct experimental methods: settling columns and Seepage Induced Consolidation (SIC) tests. The differences observed between the two sets of material parameters suggest that the stress history and plastic deformation during mixing may influence the results. These effects were analysed using a one-dimensional vertical (1DV) consolidation model. The computed profiles were then compared with the profiles measured using an Ultrasonic High Concentration Meter. An initial concentration of 558.1 g/l, achieved by remixing the equilibrium profile of a normally consolidated suspension, resulted in larger final densities and a lower sediment-water interface. Conversely, a concentration of 175.6 g/l, achieved by remixing consolidating dredged sediment, yielded the same equilibrium layer thickness and density profile as virgin consolidation, albeit after a longer consolidation time. These findings are particularly relevant for land reclamation and wetland construction projects, where the initial density may be high and the dredging process’s mixing may alter the stress state.https://www.frontiersin.org/articles/10.3389/fmars.2024.1466650/fulldredged sedimentinitial conditionsmass concentrationconsolidationMarker WaddenSeepage Induced Consolidation Test |
| spellingShingle | Maria Barciela-Rial Maria Barciela-Rial Barend A. P. van den Bosch Thijs van Kessel Jasper Griffioen Jasper Griffioen Johan C. Winterwerp Experimental and numerical analysis of underwater consolidation of dredged sediment: a case of study for the Marker Wadden Frontiers in Marine Science dredged sediment initial conditions mass concentration consolidation Marker Wadden Seepage Induced Consolidation Test |
| title | Experimental and numerical analysis of underwater consolidation of dredged sediment: a case of study for the Marker Wadden |
| title_full | Experimental and numerical analysis of underwater consolidation of dredged sediment: a case of study for the Marker Wadden |
| title_fullStr | Experimental and numerical analysis of underwater consolidation of dredged sediment: a case of study for the Marker Wadden |
| title_full_unstemmed | Experimental and numerical analysis of underwater consolidation of dredged sediment: a case of study for the Marker Wadden |
| title_short | Experimental and numerical analysis of underwater consolidation of dredged sediment: a case of study for the Marker Wadden |
| title_sort | experimental and numerical analysis of underwater consolidation of dredged sediment a case of study for the marker wadden |
| topic | dredged sediment initial conditions mass concentration consolidation Marker Wadden Seepage Induced Consolidation Test |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2024.1466650/full |
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