Simulation of river water temperatures during various hydro-peaking regimes

Bakken, Tor Haakon; King, Tyler; Alfredsen, Knut

doi:10.1080/23249676.2016.1181578

Cited by 20 publications

(11 citation statements)

References 34 publications

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“…Relevant statistics can be seen in Table 1. The Pearson correlation of 0.9995 obtained in this study is comparable to the ones obtained in [21,38]. The corresponding Manning number distribution can be seen in Figure 4.…”

Section: Calibrationsupporting

confidence: 86%

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Case Study of Transient Dynamics in a Bypass Reach

Burman

Andersson

Hellström

et al. 2020

Water

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The operating conditions of Nordic hydropower plants are expected to change in the coming years to work more in conjunction with intermittent power production, causing more frequent hydropeaking events. Hydropeaking has been shown to be detrimental to wildlife in the river reaches downstream of hydropower plants. In this work, we investigate how different possible future hydropeaking scenarios affect the water surface elevation dynamics in a bypass reach in the Ume River in northern Sweden. The river dynamics has been modeled using the open-source solver Delft3D. The numerical model was validated and calibrated with water-surface-elevation measurements. A hysteresis effect on the water surface elevation, varying with the downstream distance from the spillways, was seen in both the simulated and the measured data. Increasing the hydropeaking rate is shown to dampen the variation in water surface elevation and wetted area in the most downstream parts of the reach, which could have positive effects on habitat and bed stability compared to slower rates in that region.

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Section: Calibrationsupporting

confidence: 86%

“…In each of the simulations, the Manning number was kept constant in the entire reach. This approach has been used with success in other studies [38]. It is assumed that the reach in proximity of the validation points are of the same roughness to the validation point.…”

Section: Calibrationmentioning

confidence: 99%

Case Study of Transient Dynamics in a Bypass Reach

Burman

Andersson

Hellström

et al. 2020

Water

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“…Classical tests were adopted to quantify the efficiency of mathematical models: Nash-Sutcliffe Efficiency (NSE) (Equation (5)), Person's correlation, r 2 and Index of Agreement (d) (Equation (6)). These tests were selected given their different practical applications in hydrodynamic modeling for water studies, i.e., to test the accuracy and capacity of the models to represent the physical reality [65][66][67][68].…”

Section: Discussionmentioning

confidence: 99%

Hydrodynamic Modeling and Simulation of Water Residence Time in the Estuary of the Lower Amazon River

Abreu

Barros

Brito

et al. 2020

Water

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Studies about the hydrodynamic behavior in the lower Amazon River remain scarce, despite their relevance and complexity, and the Water Residence Time (Rt) of this Amazonian estuary remains poorly unknown. Therefore, the present study aims to numerically simulate three seasonal Rt scenarios based on a calibrated hydrodynamic numerical model (SisbaHiA) applied to a representative stretch of the lower Amazon River. The following methodological steps were performed: (a) establishing experimental water flow in natural channels; (b) statistically test numerical predictions (tidal range cycles for different hydrologic periods); and (c) simulating velocity fields and water discharge associated with Rt numerical outputs of the hydrodynamic model varied from 14 ≤ Rt ≤ 22 days among different seasonal periods. This change has shown the significant influence of hydrologic period and geomorphological features on Rt. Rt, in its turn, has shown significant spatial heterogeneity, depending on location and stretch of the channels. Comparative analyses between simulated and experimental parameters evidenced statistical correlations higher than 0.9. We conclude that the generated Rt scenarios were consistent with other similar studies in the literature. Therefore, they depicted the applicability of the hydrodynamics to the conservation of the Amazonian aquatic ecosystem, as well as its relevance for biochemical and pollutant dispersion studies, which still remain scarce in the literature.

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“…Variations in the market demand for electric power may lead to short‐term changes in the operational regimes of hydropower plants, resulting in rapid unnatural water level fluctuations (Gore & Petts, ), termed hydropeaking. Such rapid increases and decreases in water volume often causes extreme fluctuations in water depth, water temperature, and flow velocity (Bain, 2009, Bakken, King, & Alfredsen, ). Hydropeaking causes a fraction of the riverbed to be dewatered, commonly referred to as the ramping zone.…”

Section: Introductionmentioning

confidence: 99%

Effects of hydropeaking on benthic invertebrate community composition in two central Norwegian rivers

Kjærstad

Arnekleiv

Speed

et al. 2018

River Research & Apps

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Hydropower regulations can have dramatic impacts on river ecological communities. The operation of hydropower stations is related to power demands, but their releases in the receiving water body causes sudden changes in flow, which in turn affect the biota. The effects of such flow variations on benthic invertebrates is not fully understood. Here, we studied the effects of duration and intensity of hydropeaking on benthic invertebrates in two rivers over a 3.5‐year period. We used both quantitative (Surber) and semiquantitative (kick samples) sampling methods to compare the ramping zone with the permanently water covered zone downstream of the hydropower plant, and with corresponding unaffected upstream areas. The ramping zone had a different invertebrate community composition and lower benthic density than other areas, especially after hydropeaking. Mayflies and chironomids were most negatively affected by hydropeaking and oligochaetes largely unaffected. Chironomids and the mayfly Baetis rhodani were able to recolonize the ramping zone and almost reach densities similar to deeper areas within 48 days following hydropeaking. The relative abundance of filter feeders tended to increase and gatherers/collectors tended to decrease from the ramping zone towards the deep, permanently water covered areas. In corresponding areas upstream of the power plant, the relative abundance of different functional feeding groups was the same in the mid‐channel and shore sites. Our study shows that hydropeaking has clear impacts on the functional structure of benthic invertebrates below the power plants. The ecological impact of hydropeaking on invertebrate communities should thus be taken into account, for example, by reducing the amplitude and duration of flow fluctuations.

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Simulation of river water temperatures during various hydro-peaking regimes

Cited by 20 publications

References 34 publications

Case Study of Transient Dynamics in a Bypass Reach

Case Study of Transient Dynamics in a Bypass Reach

Hydrodynamic Modeling and Simulation of Water Residence Time in the Estuary of the Lower Amazon River

Effects of hydropeaking on benthic invertebrate community composition in two central Norwegian rivers

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