Functional Relationships between Critical Erosion Thresholds of Fine Reservoir Sediments and Their Sedimentological Characteristics
Publication: Journal of Hydraulic Engineering
Volume 148, Issue 10
Abstract
This study investigated multivariate relationships between critical erosion thresholds of reservoir sediments and their physicochemical and biological characteristics to unravel the effect of sedimentological parameters on fine sediment erosion. We collected 22 sediment cores from the deposits of two reservoirs located in southern Germany, Grosser Brombachsee (GBS), and Schwarzenbachtalsperre (SBT). An erosion flume and an advanced photogrammetric method were used to quantify critical erosion thresholds for a succession of vertical layers over sediment depth. The functional relationships between the critical erosion thresholds and a collection of sediment parameters including bulk density, sediment composition, percentiles, cation exchange capacity, organic content, extracellular polymeric substances (EPS proteins and carbohydrates), and chlorophyll-a were examined. The clay-dominated sediments of the GBS with comparatively low total organic carbon and sand content were, on average, 10 times more stable than the sandy sediments of the SBT. Consequently, for the clay-dominated sediments, strong positive correlations were found between the erosion thresholds and clay content. In contrast, the sandy sediment layers experienced strong positive correlations with the sand content and percentiles. The bulk density was mainly positively correlated, and the total organic carbon content was mainly negatively correlated, with the erosion thresholds. Furthermore, EPS and chlorophyll-a were not good indicators for the erosion thresholds, suggesting an ambiguous influence of biology. Generally, the strength of the relations decreased for sediment layers deeper than 10 cm. Overall, our results underline the need to investigate the influence of sediment characteristics on fine sediment erodibility from varying natural environments.
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Data Availability Statement
All data generated or used during the study are available in an online repository in accordance with the funder data retention policies (Beckers et al. 2021). Direct link to the data: https://doi.org/10.5281/zenodo.4474529.
Acknowledgments
Felix Beckers and Kaan Koca contributed equally to this work and share first authorship. This study was carried out within the project CHARM (Challenges of Reservoir Management)–Meeting Environmental and Social Requirements. The project is funded by the Ministry of Science, Research, and Arts of the federal state of Baden-Württemberg, Germany. It is part of the Water Research Network Baden-Württemberg. We gratefully acknowledge the help of Mr. Ruslan Biserov in conducting various erosion experiments. We also thank colleagues and student assistants involved in the CHARM project, along with the Elite Program of the Baden-Württemberg Stiftung for the postdoctoral fellowship (S.H). The authors declare no conflict of interest.
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Journal of Hydraulic Engineering
Volume 148 • Issue 10 • October 2022
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Received: Jan 30, 2021
Accepted: Jan 30, 2022
Published online: Jul 22, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 22, 2022
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