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Impact of substrate clogging on vertical connectivity

Giovanni De Cesare, Romain Maxime Dubuis, Robin Schroff

Connectivity between the hyporheic zone and the flow is essential for the development of benthos and the reproductive success of spawning fish. The infiltration of fine sediment leads to clogging of the riverbed, reducing porosity and vertical water exchange. Natural clogging cycle is altered by infrastructure and land use. This chapter includes a short review of the process and influencing factors, which are illustrated with some experimental results. These principles are then applied to a selection of common cases.

2023

Influence of channel geomorphic units on bedload transport and river morphology during low‐magnitude bed‐forming floods coupled with sediment augmentation

Giovanni De Cesare, Christian Mörtl, Robin Schroff, Severin Stähly

In this study, we map different types of channel geomorphic units in a sediment-starved, residual-flow reach before and after an artificial flood. Bedload particles of a previous sediment augmentation measure are tracked with passive integrated transponder tags, and water depth and flow velocity are recorded across ten cross-sections. The analysis focuses on the influence of channel geomorphic units on bedload transport and river morphology. Our hypotheses are that during low-magnitude bed-forming floods with sediment pulse migration, (i) existing channel geomorphic units influence bedload transport and, more specifically, (ii) that their type influences the retention rate of bedload particles. Furthermore, we hypothesise that (iii) the density of channel geomorphic units is linked to the hydromorphological diversity of a river section. We provide evidence that supports the first two hypotheses and contradicts the third one. We consider our results to be transferable to similarly regulated reaches based on an analysis of site-specific conditions and alternative explanatory factors. Further research is needed to transfer the results to varying flood and sediment supply conditions in unregulated reaches.

2023

Sediment continuity and augmentation measures

Giovanni De Cesare, Robin Schroff

Impaired sediment transport can have numerous adverse impacts on the eco-morphodynamics of the riverscape. If well designed, sediment augmentation measures present a promising mitigation approach at different scales. This chapter focuses on flume experiments conducted to investigate the influence of sediment augmentation on morphological bed structures and the persistence of emerging bedforms. It also includes information about design criteria and outcome evaluation methods

2023