An Integrated Marine Data Collection for the German Bight – 
Part II: Tides, Salinity and Waves (1996–2015 CE)

Hagen, Robert; Plüß, Andreas; Ihde, Romina; Freund, Janina; Dreier, Norman; Nehlsen, Edgar; Schrage, Nico; Fröhle, Peter; Kösters, Frank

doi:10.5194/essd-2021-45

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…As the tide rises, the tidal basins are filled, and they are emptied again as the tide falls [46]. Incoming waves generally run in from the directions between northwest and southwest; only the northwest components of waves are incident on the study site [47]. [42], data obtained from [2,42]).…”

Section: Regional Setting and Coastal Protection Measuresmentioning

confidence: 99%

Influence of Sand Trapping Fences on Dune Toe Growth and Its Relation with Potential Aeolian Sediment Transport

Eichmanns

Schüttrumpf

2021

JMSE

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This study provides insights into dune toe growth around and between individual brushwood lines of sand trapping fences at the dune toe of coastal dunes using digital elevation models obtained from repeated unmanned aerial vehicle surveys. Prevailing boundary conditions, especially sediment supply, as well as the porosity and arrangement of the installed sand trapping fences significantly influence the effectiveness of different configurations of sand trapping fences. The dune toe growth is significant immediately after constructing a new sand trapping fence and decreases over time. According to the results presented in this study, for sand trapping fences that have been in place longer, the protruding branch height and the porosity of the remaining branches play a minor role in trapping sand. Sand trapping fences with lower permeability favour localized coastal dune toe growth directly at their brushwood lines, whereas fences with higher porosity allow for more sediment deposition further downwind. The trend in dune toe changes can be roughly predicted by integrating potential sediment transport rates calculated with hourly meteorological data.

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Section: Regional Setting and Coastal Protection Measuresmentioning

confidence: 99%

Influence of Sand Trapping Fences on Dune Toe Growth and Its Relation with Potential Aeolian Sediment Transport

Eichmanns

Schüttrumpf

2021

JMSE

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“…Measured values were available for most parameters, but not for water level and salinity at the seaward model boundary in the North Sea in 1966Sea in , 1972Sea in , and 1981. For the water level however, historical records for tidal high and low water levels were available for the station 'Leuchtturm Alte Weser' (ALW, see (Hagen et al, 2021b). As reference data, the tidal range and tidal mean water level at station ALW, salinity records at Helgoland station (Wiltshire et al, 2008), and the discharge of the Weser and Elbe were used.…”

Section: Model Forcingmentioning

confidence: 99%

Modelling the impact of anthropogenic measures on saltwater intrusion in the Weser estuary

Kolb

Zorndt

Burchard

et al. 2022

Preprint

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Abstract. The Weser estuary has been subject to profound changes in topography in the last hundred years through natural variations and river engineering measures, leading to strong changes in hydrodynamics. These changes are also expected to have affected the dynamics of saltwater intrusion. Using numerical modelling, we examined saltwater intrusion in the Weser estuary in four different system states (1966, 1972, 1981, 2012). Models of each system state were set up with the respective topography and boundary values. The resolution of historical and recent topographical data is usually not comparable, which needs to be compensated, e.g., by calibration of roughness parameters. Therefore, each model was individually calibrated and validated. In simulations of one hydrological year for each system state (hindcasting study), the influence of topography is overshadowed by the effects of other factors, particularly river discharge. At times of identical discharge, results indicate a landward shift of the salinity front between 1966 and 2012. Subsequent simulations with different topographies but identical boundary conditions (scenario study) confirm that topographic changes in the Weser estuary affected saltwater intrusion. Solely through the topography changes, at a discharge of 300 m3 s-1, the position of the tidally averaged and depth-averaged salinity front shifted landwards by about 2.5 km between 1972 and 1981 due to deepening measures in the Lower Weser between these years. It shifted by another 1 km between 1981 and 2012. These changes are significant but comparatively small, since due to seasonal variations in run-off, the tidally averaged salinity intrusion can vary by more than 20 km.

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“…We apply the modelling systems UnTRIM² with the novel subgrid approach for high-resolution bathymetry representation on unstructured grids (Casulli, 1990;Casulli and Stelling, 2011) for the simulation of tidal dynamics and transport, and the sediment transport module SediMorph (Malcherek et al, 2002) for bottom roughness estimation. Waves are computed by the unstructured k-model UnK (Schneggenburger et al, 2000) and SWAN.…”

Section: Numerical Modellingmentioning

confidence: 99%

Comment on essd-2021-45

2021

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The German Bight within the central North Sea is of vital importance to many industrial nations in the European Union (EU), which have obligated themselves to ensure the development of green energy facilities and technology, while improving natural habitats and still being economically competitive. These ambitious goals require a tremendous amount of careful planning and considerations, which depends heavily on data availability. For this reason, we established in close cooperation with stakeholders an open-access integrated, marine data collection from 1996 to 2015 for bathymetry, surface sediments, tidal dynamics, salinity, and waves in the German Bight for science, economy, and governmental interest. This second part of a two-part publication presents data products from numerical hindcast simulations for sea surface elevation, current velocity, bottom shear stress, salinity, wave parameters and wave spectra. As an important improvement to existing data collections our model represents the variability of the bathymetry by using annually updated model topographies. Moreover, we provide model results at a high temporal and spatial resolution (Hagen et al., 2020b), i.e. model results are gridded to 1,000 m at 20-minute intervals (10.48437/02.2020.K2.7000.0004). Tidal characteristic values (Hagen et al., 2020a), such as tidal range or ebb current velocity, are computed based on the numerical modeling results (10.48437/02.2020.K2.7000.0003). Therefore, this integrated, marine data collection enables coastal stakeholders and scientists to easily enter and participate in countless applications, which could be the development of detailed coastal models, handling of complex natural habitat problems, design of coastal structures, or trend exploration into the future.

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An Integrated Marine Data Collection for the German Bight – Part II: Tides, Salinity and Waves (1996–2015 CE)

Cited by 3 publications

References 5 publications

Influence of Sand Trapping Fences on Dune Toe Growth and Its Relation with Potential Aeolian Sediment Transport

Influence of Sand Trapping Fences on Dune Toe Growth and Its Relation with Potential Aeolian Sediment Transport

Modelling the impact of anthropogenic measures on saltwater intrusion in the Weser estuary

Comment on essd-2021-45

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