Characterizing Effects of Hydropower Plants on Sub-Daily Flow Regimes

Bejarano Carrión, María Dolores and Sordo Ward, Álvaro Francisco and Alonso González, Carlos and Nilsson, Christer (2017). Characterizing Effects of Hydropower Plants on Sub-Daily Flow Regimes. "Journal of Hydrology", v. 550 ; pp. 186-200. ISSN 0022-1694. https://doi.org/10.1016/j.jhydrol.2017.04.023.

Description

Title: Characterizing Effects of Hydropower Plants on Sub-Daily Flow Regimes
Author/s:
  • Bejarano Carrión, María Dolores
  • Sordo Ward, Álvaro Francisco
  • Alonso González, Carlos
  • Nilsson, Christer
Item Type: Article
Título de Revista/Publicación: Journal of Hydrology
Date: 20 April 2017
Volume: 550
Subjects:
Freetext Keywords: Hydrological Alterations, Hydrological Characterization, Hydropeaking, Impact Assessment, Short-Term, Sub-Daily Flows
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ingeniería Civil: Hidráulica, Energía y Medio Ambiente
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

A characterization of short-term changes in river flow is essential for understanding the ecological effects of hydropower plants, which operate by turning the turbines on or off to generate electricity following variations in the market demand (i.e., hydropeaking). The goal of our study was to develop an approach for characterizing the effects of hydropower plant operations on within-day flow regimes across multiple dams and rivers. For this aim we first defined ecologically meaningful metrics that provide a full representation of the flow regime at short time scales from free-flowing rivers and rivers exposed to hydropeaking. We then defined metrics that enable quantification of the deviation of the altered short-term flow regime variables from those of the unaltered state. The approach was successfully tested in two rivers in northern Sweden, one free-flowing and another regulated by cascades of hydropower plants, which were additionally classified based on their impact on short-term flows in sites of similar management. The largest differences between study sites corresponded to metrics describing sub-daily flow magnitudes such as amplitude (i.e., difference between the highest and the lowest hourly flows) and rates (i.e., rise and fall rates of hourly flows). They were closely followed by frequency-related metrics accounting for the numbers of within-day hourly flow patterns (i.e., rises, falls and periods of stability of hourly flows). In comparison, between-site differences for the duration-related metrics were smallest. In general, hydropeaking resulted in higher within-day flow amplitudes and rates and more but shorter periods of a similar hourly flow patterns per day. The impacted flow feature and the characteristics of the impact (i.e., intensity and whether the impact increases or decreases whatever is being described by the metric) varied with season. Our approach is useful for catchment management planning, defining environmental flow targets, prioritizing river restoration or dam reoperation efforts and contributing information for relicensing hydropower dams.

Funding Projects

TypeCodeAcronymLeaderTitle
FP7623691RIPEAKUMEA UNIVERSITETResponses of RiParian Forests to HydroPeaking: Towards a Sustainable Hydro-power Management

More information

Item ID: 50499
DC Identifier: http://oa.upm.es/50499/
OAI Identifier: oai:oa.upm.es:50499
DOI: 10.1016/j.jhydrol.2017.04.023
Official URL: https://www.sciencedirect.com/science/article/pii/S0022169417302433
Deposited by: Memoria Investigacion
Deposited on: 03 May 2018 18:10
Last Modified: 20 Apr 2019 22:30
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