Asynchronicity of fine sediment supply and its effects on transport and storage in a regulated river

Open access via Springer Compact Agreement This study was funded by the Environment Agency (EA) and United Utilities (UU) as part of a PhD grant. We would like to thank Gail Butteril, Jane Atkins, Andy Newton and Helen Reid from EA, as well as Kat Liney and Grace Martin from UU for their help and support throughout the project. Damià Vericat is funded by a Ramon y Cajal fellowship (RYC-2010-06264). Authors acknowledge the support from the Economy and Knowledge Department of the Catalan Government through the Consolidated Research Group “Fluvial Dynamics Research Group”—RIUS (2014 SGR 645), and the additional support provided by the CERCA Programme, also from the Catalan Government. We are also thankful to two anonymous reviewers whose comments have helped improve the paper.Peer reviewedPublisher PD

Geomorphological response to system-scale river rehabilitation I : Sediment supply from a reconnected tributary

Funding Information: This study was funded as part of a PhD grant by the Environment Agency UK and United Utilities. DV was funded by a Ramon y Cajal fellowship (RYC-2010-06264) at the time the project was developed, and is now employed as a Serra H?nter Fellow at the University of Lleida. Authors acknowledge the support from the Economy and Knowledge department of the Catalan Government through the Consolidated Research Group ?Fluvial Dynamics Research Group?-RIUS (2017-SGR-459), and the additional support provided by the CERCA Programme, also from the Catalan Government. Publisher Copyright: © 2020 The Authors. River Research and Applications published by John Wiley & Sons Ltd Copyright: Copyright 2020 Elsevier B.V., All rights reserved.Peer reviewe

Geomorphological response to system-scale river rehabilitation II : Main-stem channel adjustments following reconnection of an ephemeral tributary

Open Access via the Jisc Wiley Agreement Research Funders United Utilities Environmental AgencyPeer reviewedPublisher PD

Application of Structure-from-Motion photogrammetry to river restoration

This research is funded by the Environment Agency and United Utilities whose support is gratefully acknowledged. Some of the methods employed in this work have been tested on the background of the results obtained in MorphSed (www.morphsed.es), a research project funded by the Spanish Ministry of Economy and Competiveness and the European Regional Development Fund Scheme (FEDER; CGL2012-36394). The second author is funded by a Ramon y Cajal Fellowship (RYC-2010-06264). Authors acknowledge the support from the Economy and Knowledge Department of the Catalan Government through the Consolidated Research Group ‘Fluvial Dynamics Research Group’ (2014 SGR 645). The authors thank Manel Llena from the University of Lleida for his help and contribution to the camera calibration experiments. We are also grateful to the three anonymous reviewers and the editors for their comments that greatly improved the manuscript.Peer reviewedPostprin

Flow regulation increases food-chain length through omnivory mechanisms in a Mediterranean river network

[EN] Dams fragment river systems worldwide, and Mediterranean-climate rivers, characterised by highly seasonal hydrographs and adapted biotas, are particularly impacted by flow regulation. Whereas the effects of flow regulation on hydrology, sediment transport and biodiversity have long been examined, responses at the food-web level remain understudied. Environmental variation is a key control of food-web structure. Thus, we predicted that flow regulation would impact food-chain length (FCL) via changes in the flow variation regime, and we tested this prediction in a set of flow unregulated to completely regulated reaches in a Mediterranean river basin. In each reach, we characterised flow variation, together with two other putative controls of FCL (productivity and habitat size). We combined community data with carbon and nitrogen stable isotopes to estimate food-chain length, and Bayesian mixing models allowed estimates of dietary proportions of consumers. Flow variation was paramount in controlling FCL in the studied river network, and this same control largely explained the degree of omnivory among top predators. Thus, omnivory mechanisms were the main proximate structural mechanism allowing shifts in food-web structure and linking disturbance regimes to FCL. Our results suggest that flow regulation in Mediterranean rivers may impact food-web structure even when no significant changes in community composition are observed. If highly variable Mediterranean streams become increasingly affected by flow regulation, the resulting more stable conditions could enhance intraguild predation and thus lengthen riverine food chains.We thank Roberto Merciai, Jose Andres Lopez and Joan Font for their help in the field, Lina Ramirez-Solano and Emili Garcia-Berthou for their help with analyses and Marc Montenegro for the illustrations in Fig. 1. The Sabo Lab at Arizona State University and anonymous reviewers provided suggestions that improved the quality of the article. This study was funded by the Spanish Ministry of Economy and Competitiveness through the SCARCE project (CSD2009-00065). Authors acknowledge the support from the Catalan Government through the Consolidated Research Groups 'Fluvial Dynamics Research Group (2014 SGR 645)' and the 'Catalan Institute for Water Research (2014 SGR 291)'.Ruhí, A.; Muñoz, I.; Tornés, E.; Batalla, R.; Vericat, D.; Ponsati, L.; Acuña, V.... (2016). Flow regulation increases food-chain length through omnivory mechanisms in a Mediterranean river network. Freshwater Biology. 61(9):1536-1549. https://doi.org/10.1111/fwb.12794S1536154961

100 key questions to guide hydropeaking research

As the share of renewable energy grows worldwide, flexible energy production from peak-operating hydropower and the phenomenon of hydropeaking have received increasing attention. In this study, we collected open research questions from 220 experts in river science, practice, and policy across the globe using an online survey available in six languages related to hydropeaking. We used a systematic method of determining expert consensus (Delphi method) to identify 100 high-priority questions related to the following thematic fields: (a) hydrology, (b) physico-chemical properties of water, (c) river morphology and sediment dynamics, (d) ecology and biology, (e) socio-economic topics, (f) energy markets, (g) policy and regulation, and (h) management and mitigation measures. The consensus list of high-priority questions shall inform and guide researchers in focusing their efforts to foster a better science-policy interface, thereby improving the sustainability of peak-operating hydropower in a variety of settings. We find that there is already a strong understanding of the ecological impact of hydropeaking and efficient mitigation techniques to support sustainable hydropower. Yet, a disconnect remains in its policy and management implementation.publishedVersio

Stochastik in der Schule. Bd. 3 Ergaenzungen zur Methodik

SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Understanding Braiding Mechanisms from Monitoring Geomorphic Change: The River Feshie, Scotland

<p>A poster documeting five years of geomorphic change on the River Feshie, Scotland. Details the methods for capturing the morphodynamic signatures of several braiding mechansisms from successive annual GPS and lidar surveys of the river.</p

Indices of hydrological and sediment connectivity - state of the art and way forward

Digital elevation models (DEMs) describe the landscape topography, which is both a product and a control of the activity of geomorphic processes. In the same way, the connectivity of landscape units with respect to water and sediment fluxes can be seen as both a driver and an emergent property of the spatiotemporal interaction of hydrological and geomorphic processes. As DEMs are available with increasing quality, resolution and spatial coverage, they form an important basis for the quantitative assessment of connectivity through indices