Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-23917
Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Tributary effects on the ecological responses of a regulated river to experimental floods
Authors: Consoli, Gabriele
Haller, Rudolf M
Doering, Michael
Hashemi, Saman
Robinson, Christopher T
et. al: No
DOI: 10.1016/j.jenvman.2021.114122
10.21256/zhaw-23917
Published in: Journal of Environmental Management
Volume(Issue): 303
Issue: 114122
Issue Date: 1-Feb-2022
Publisher / Ed. Institution: Elsevier
ISSN: 0301-4797
1095-8630
Language: English
Subjects: Disturbance; Environmental flow; Geomorphology; Macroinvertebrates; Metabolism; River; Unmanned aerial device; Water; Ecosystem; Flood
Subject (DDC): 333: Economics of land and resources
551: Geology and hydrology
Abstract: Rivers regulated by dams display several ecosystem alterations due to modified flow and sediment regimes. Downstream from a dam, ecosystem degradation occurs because of reduced disturbance, mostly derived from limitations on flow variability and sediment supply. In the last decade, most flow restoration/dam impact mitigation was oriented towards the development of environmental flows. Flow variability (and consequent disturbance) can be reintroduced by releasing artificial high flows (experimental floods). Flow-sediment interactions during experimental floods represent strong ecosystem drivers, influencing nutrient dynamics, and metabolic and functional properties. In river networks, sediment and water inputs from tributaries generate points of discontinuity that can drive major changes in environmental conditions, affecting habitat structure and determining functional differences between upstream and downstream. However, despite the relevance for management, flow/sediment relations during environmental flows - and more importantly during experimental floods - remain poorly understood, mostly due to the lack of empirical evidence. In this study, we examined how a major tributary (source of water and sediments) modified the physical habitat template of a regulated river, thereby influencing ecological and geomorphological responses to experimental floods. Methods combined high-resolution drone mapping techniques with a wide range of biological samples collected in field surveys before, during, and after experimental floods in an alpine river. Data were used to quantify changes in relevant functional and structural ecosystem properties, relating ecological responses to geomorphological dynamics. Results highlight the importance of tributaries in restoring ecosystem properties lost after damming, enhancing the resilience of the system. In addition, we observed that disturbance legacy played a fundamental role in determining ecological conditions of a river prior to experimental floods, thus confirming that considering flow variability and sediment availability is crucial in adaptive dam management and environmental flows design.
URI: https://digitalcollection.zhaw.ch/handle/11475/23917
Fulltext version: Published version
License (according to publishing contract): CC BY 4.0: Attribution 4.0 International
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Natural Resource Sciences (IUNR)
Published as part of the ZHAW project: Monitoring künstliche Hochwasser an der Sarine
Appears in collections:Publikationen Life Sciences und Facility Management

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