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SD1 Key Hypotheses
The formation of patterns in bed morphology, and in the bed and suspended sediments in tidal environments, is controlled by the interplay between sediment characteristics and coherent hydrodynamic structures, which are superimposed on the harmonic tidal forcing.
Patterns in morphology and suspended-matter dynamics form and act at different temporal and spatial scales, respectively: e.g. compound bedforms, which are ubiquitous rhythmic bed features that develop in sandy shallow and deep-water environments (Ernstsen et al. 2005). Likewise, fine particles are suspended and transported into the water column, where they aggregate and group as seen by distinct turbidity oscillations. Under low-energy conditions they settle in depositional areas, which range from small domains like the troughs of bedforms to large mud deposits on the shelf. The interaction between initiation and replication of rhythmic patterns and the forced or free behavior of sedimentary elements, still commonly treated separately, will be investigated by insitu measurements and experimental numerical model investigations.
The morphodynamics of small-scale features (e.g. tidal bedforms) affect the evolution of largescale coastal systems, which in turn act as controlling boundary conditions on the development of smaller system entities.
This hypothesis will be tested by studying examples of the interactions between morphodynamic scales, which range from the effect of sediment properties on initial ripple stages to the superimposition of bedforms of varying size, and to the dynamics of coastal and shelf systems.
Crossscale effects like adaptation time and length scales of sedimentary features under varying forcing shall be quantified and expressed in process-based models.
Natural and anthropogenic signatures in sedimentary units of coastal and shelf systems can be deciphered by relating their geometry and sedimentology to coherent forcing hydrodynamics and sedimentological boundary conditions.
Sedimentary units from coastal bedforms to mid-shelf mud depocenters attain dynamic equilibria depending on the availability of sediments and the hydrodynamic forcing. The effects of changes in boundary conditions on different environments will be studied: Large-scale surveys of the transition zones and dating of mud depocenter margins aim to assess seasonal changes and anthropogenic influences. At smaller scales, the effects of tidal and extreme conditions on the geometry and internal structure of bedforms and on suspended matter dynamics will be quantified.
Patterns in morphology and suspended-matter dynamics form and act at different temporal and spatial scales, respectively: e.g. compound bedforms, which are ubiquitous rhythmic bed features that develop in sandy shallow and deep-water environments (Ernstsen et al. 2005). Likewise, fine particles are suspended and transported into the water column, where they aggregate and group as seen by distinct turbidity oscillations. Under low-energy conditions they settle in depositional areas, which range from small domains like the troughs of bedforms to large mud deposits on the shelf. The interaction between initiation and replication of rhythmic patterns and the forced or free behavior of sedimentary elements, still commonly treated separately, will be investigated by insitu measurements and experimental numerical model investigations.
The morphodynamics of small-scale features (e.g. tidal bedforms) affect the evolution of largescale coastal systems, which in turn act as controlling boundary conditions on the development of smaller system entities.
This hypothesis will be tested by studying examples of the interactions between morphodynamic scales, which range from the effect of sediment properties on initial ripple stages to the superimposition of bedforms of varying size, and to the dynamics of coastal and shelf systems.
Crossscale effects like adaptation time and length scales of sedimentary features under varying forcing shall be quantified and expressed in process-based models.
Natural and anthropogenic signatures in sedimentary units of coastal and shelf systems can be deciphered by relating their geometry and sedimentology to coherent forcing hydrodynamics and sedimentological boundary conditions.
Sedimentary units from coastal bedforms to mid-shelf mud depocenters attain dynamic equilibria depending on the availability of sediments and the hydrodynamic forcing. The effects of changes in boundary conditions on different environments will be studied: Large-scale surveys of the transition zones and dating of mud depocenter margins aim to assess seasonal changes and anthropogenic influences. At smaller scales, the effects of tidal and extreme conditions on the geometry and internal structure of bedforms and on suspended matter dynamics will be quantified.
