Description: Objective and Tasks North Sea Region estuaries are dynamic environments subject to persistent and increasing pressures such as modified tidal ranges, higher sedimentation rates and increased risk of flooding, which impact estuary ecological functioning and services. The implementation of coastal management measures that respond to those pressures has to follow EU-regulations (e. g. Natura 2000 and Water Framework Directive) and demands long planning periods, stakeholder commitment and large investments. The aim of the project IMMERSE is to accelerate the implementation of such large-scale measures that contribute to a sustainable management of North Sea ecosystems. Research institutions, governmental administrations and enterprises from the North Sea region address different challenges regarding sediment management, flood protection and the creation of intertidal habitats. Areas of interest are the estuaries Elbe, Scheldt, Göta Älv, Tees, Humber, Isefjord/Holbaekfjord and Roskilde Fjord. Importance for the Federal Waterways and Shipping Administration (WSV) New solutions and improved designs of coastal and river engineering measures are developed in the project. The know-how of the BAW in best practices to secure navigation, managing the estuaries sustainably, will be enhanced by exchanging knowledge and expertise with other experts of the North Sea estuarine community. For tidal amplification and tidal pumping, pressures that affect the sediment transport and thus the maintenance works for navigation in the Elbe estuary, different measure types are investigated, pilots carried on and feasibility assessments conducted by different organisations. Within the project, the BAW has evaluated the hydraulic effects of reconnecting a cut-off anabranch to the tidal river Elbe to reduce tidal pumping and the tidal range, an assessment required for decision-making at the dialog process Forum Tideelbe (WSV steering committee partner). The next task of the BAW in the project relates to the improvement of the numerical model to compute the spread of particle-bound contaminants, which is relevant in planning strategies for the sediment management at the maritime fairway Elbe. Consultancy for the WSV on sediment relocation and issues related to sediment mobilisation and pollutants fate will advance, ensuring the use of numerical methods at state-of-the-art standards. Research Methods Three-dimensional numerical simulations are employed using the hydrodynamic modelling system UnTRIM (Casulli and Lang 2004) in combination with the morphological model SediMorph. For the assessment of the anabranch reconnection, the measure layout included a tidal flow control at the sluice gate Tatenberger Siel to constrain the amount of water flowing in and out the anabranch and so limit the variation of the water level within the anabranch Dove Elbe (BAW 2021). The aim here was to compute the maximal expected effects on the estuary dynamics considering the tidal flow control, and so to provide an estimation of the measure benefits for a comparison with two other potential locations: Haseldorfer Marsch and alte Süderelbe (see Forum Tideelbe 2020). Since the flow constriction at the weir was only partially considered in this feasibility assessment, the model approach for weir control has been improved during the project. Within the modular architecture of UnTRIM, an add-on feature has been programmed and coupled in the model suite within the software environment PROHGOME (see Lang 2017) at the department for hydraulic engineering in coastal areas of the BAW. The next activities of the BAW in the project will address the development of a transport model to compute the spread of particle-bound contaminants in the tidal Elbe. At the next, a comprehensive review addressing research gaps and parametrization needs for the SPM transport behavior related to organic and inorganic pollutants will be carried on.
SupportProgram
Origins: /Bund/UBA/UFORDAT
Tags: Ästuar ? Taube ? Bundeswasserstraße ? Hydrodynamik ? Flussbegradigung ? EU-Verordnung ? Elbe ? Umweltbelastung ? Marschland ? Siel ? Software ? Habitat ? Wasserrahmenrichtlinie ? Küstenmanagement ? Natura-2000 ? Navigation ? Architektur ? Wasserbau ? Sediment ? Küstenregion ? Hochwasserschutz ? Modellierung ? Interessenvertreter ? Literaturauswertung ? Verkehrsmodell ? Sedimenttransport ? Ökosystem ? Schifffahrt ? Sedimentation ? Wasserstand ? Nachhaltige Bewirtschaftung ? Forschungseinrichtung ? Investition ? Nordsee ?
Region: Baden-Württemberg
Bounding boxes: 9° .. 9° x 48.5° .. 48.5°
License: cc-by-nc-nd/4.0
Language: Englisch/English
Time ranges: 2018-01-01 - 2023-12-31
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