Next Article in Journal
Application of Waste Polymers as Basic Material for Ultrafiltration Membranes Preparation
Previous Article in Journal
Numerical Studies on the Suitable Position of Artificial Upwelling in a Semi-Enclosed Bay
Open AccessArticle

Effects of Hydropeaking on Bed Mobility: Evidence from a Pyrenean River

1
Fluvial Dynamics Research Group (RIUS), University of Lleida, 25003 Lleida, Catalonia, Spain
2
Forest Sciences Centre of Catalonia Consortium (CTFC), 25280 Solsona, Catalonia, Spain
3
Catalan Institute for Water Research (ICRA), 17241 Girona, Catalonia, Spain
4
Faculty of Forest Sciences and Natural Resources, Universidad Austral de Chile, Valdivia 5110566, Chile
*
Author to whom correspondence should be addressed.
Water 2020, 12(1), 178; https://doi.org/10.3390/w12010178 (registering DOI)
Received: 21 November 2019 / Revised: 27 December 2019 / Accepted: 3 January 2020 / Published: 8 January 2020
(This article belongs to the Section Hydrology)
Hydropower production involves significant impacts on the dynamics and continuity of river systems. In this paper we analyse the effects of hydropeaks on river-bed particle mobility along a 2-km river channel. For this, a total of four study reaches were stablished: one considered a control reach (no impact by hydropeaking) and three impacted (upstream and downstream from the confluence of tributaries). Mobility related to three hydrological scenarios considered representative of the entire flow conditions in the control and impacted reaches was investigated. Results indicate that sediment availability and dynamics proved different in the control reach to those observed downstream in reaches daily affected by hydropeaks. In the absence of large floods capable of resetting the system from a sedimentary point-of-view, only the role of tributaries during small flow events reduces the effects of hydropeaks on river-bed particles’ availability and mobility. The effects of a hydropeaked regime are not observed for the whole spectrum of grain-sizes present in the river-bed. While the structural large elements (i.e., boulders) in the channel do not move, sand and fine gravel stored in patches of the bed are constantly entrained, transported and depleted whereas, in between, medium and large gravel are progressively winnowed. Our results point out that hydropeaked flows, which are generally not considered as disturbances in geomorphic terms, initiate frequent episodes of (selected) bed mobility and, consequently, the river-bed becomes depleted of fine sediments from patches and progressively lacks other fractions such as medium gravels, all of which are highly relevant from the ecological point of view. View Full-Text
Keywords: hydropeaking; bed-mobility; patches; sediment availability; floods; flow competence; sediment depletion hydropeaking; bed-mobility; patches; sediment availability; floods; flow competence; sediment depletion
Show Figures

Graphical abstract

MDPI and ACS Style

Vericat, D.; Ville, F.; Palau-Ibars, A.; Batalla, R.J. Effects of Hydropeaking on Bed Mobility: Evidence from a Pyrenean River. Water 2020, 12, 178.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop