Habitat preference by grayling (<i>Thymallus thymallus</i>) in an artificially modified, hydropeaking riverbed: a contribution to understand the effectiveness of habitat enhancement measures

Vehanen, Teppo; Huusko, Ari; Yrjänä, Timo; Lahti, Markku; Mäki‐Petäys, Aki

doi:10.1046/j.1439-0426.2003.00354.x

Cited by 44 publications

(34 citation statements)

References 25 publications

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“…Two-dimensional approaches have been used in several stream habitat studies (Ghanem et al 1996;Diplas 2000, 2002;Vehanen et al 2003or Leclerc et al 1995.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of instream habitat enhancement options using fish habitat simulations: case-studies in the river Pas (Spain)

Jalón

Gortázar

2006

Aquat Ecol

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In the northern coast of Spain there are rivers with Atlantic salmon populations. In the upper reaches of one of these streams, river Pas, the effectiveness of habitat enhancement measures was evaluated, under different instream flow conditions. By means of the Instream Flow Incremental Methodology and using a two dimensional hydraulic model (River2D, Steffler P (2000) Software River2D. Two Dimensional Depth Averaged Finite Element Hydrodynamic Model. University of Alberta, Canada), the potential value of stream habitat for different salmon development stages requirements was measured by Weighted Useable Area (WUA). This habitat evaluation was carried out for the unmodified stream reach, which represent the control or natural conditions. Habitat improvement measures (alternate deflectors and low dams) were simulated in the original riverbed topography. Over this modified base, habitat was estimated running River2D again. By comparing the salmon habitat evaluations in the control conditions with those obtained under those improvement conditions we have been able to assess the effectiveness of each one, and the instream flow environment at which maximum improvement is reached. The maximum habitat improvement was obtained around 10 m 3 /s for the adult salmon, and for the fry and parr it was around 6 m 3 /s. However, the habitat simulation results show that with both improvement measures, under a natural flow regime the mean annual habitat increases around 1% of the WUA in relation to the control conditions, which is not a significant improvement. A similar small WUA increase was obtained when changing the bed topography, considering geomorphological adjustments due to the new erosion and sedimentation areas caused by the presence of these structures. Therefore, these types of habitat improvement measures are not recommended in these stream reaches.

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“…Two-dimensional approaches have been used in several stream habitat studies (Ghanem et al 1996;Diplas 2000, 2002;Vehanen et al 2003or Leclerc et al 1995.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of instream habitat enhancement options using fish habitat simulations: case-studies in the river Pas (Spain)

Jalón

Gortázar

2006

Aquat Ecol

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“…As in other countries, hydropeaking operations are not well regulated in Switzerland. Although there have been an increasing number of investigations during the last 20 years (Cushman, 1985;Irvine and Jowett, 1987;Moog, 1993;Vehanen et al, 2003) practical advice on hydropeaking management is still vague. A recent literature analysis of more than 200 papers shows a clear lack of knowledge according to the ecological impacts of peak frequency and magnitude but emphasizes the importance of riverbed morphology for assessing the ecological impacts of hydropeaking (Baumann and Klaus, 2003).…”

Section: Evaluating the Assessment Toolsmentioning

confidence: 99%

Green hydropower: a new assessment procedure for river management

Bratrich

Truffer

Jorde

et al. 2004

River Research & Apps

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Hydropower is the most important renewable electricity source worldwide. It shows clear advantages for the global CO 2 balance but creates serious ecological impacts on a local scale. As a consequence, concern for the conservation of natural river ecosystems is growing within society and more people are willing to pay extra for so-called 'green electricity'. The definition of 'green', however, is not straightforward and customers cannot directly examine the quality of electricity products. Therefore, credible certification of high ecological standards is essential for successful green electricity marketing.In this paper we introduce a new assessment procedure for evaluating environmentally compatible hydropower production. This so-called 'Green Hydro' concept was developed in the context of a multidisciplinary case study on a 400 MW hydropower scheme in the Southern Alps of Switzerland. The concept guarantees both general standards for different schemes operating in different types of watersheds and flexibility for local particularities. We developed an environmental management matrix that considers basic criteria and eco-investments and covers five environmental areas of concern (i.e. hydrological character, connectivity, morphology, landscape, and biological communities). The ecological perspective is complemented by five management domains (i.e. instream flow regimes, hydropeaking, reservoir and bedload management, and power plant structures). Applying assessment and modelling tools for the Green Hydro procedure showed that dynamic habitat models allowed quantification of the effects of different instream flow regulations at morphologically distinct sites. In this case, morphological restoration could be more beneficial than increasing the minimum flow.The first experience with the Green Hydro certification is encouraging. So far, 13 facilities have successfully passed the certification procedure. They produce a total of 186 GWh green electricity per year, which is sufficient for the supply of almost 40 000 households in Switzerland.

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“…Fewer than five fish per 100-m river section have been fished inside the investigated river section, whereas a healthy population should achieve more than 150 individuals per section [52]. Three habitat types that are related to different life cycle stages have been identified [49][50][51][53][54][55][56][57][58][59][60][61][62][63][64][65] and were labeled TTA (Habitat for Adults), TTS (Habitat for Spawning), and TTJ (Habitat for Juveniles) ( Table 1).…”

Section: Fish Species Studiedmentioning

confidence: 99%

Model-Based Evaluation of the Effects of River Discharge Modulations on Physical Fish Habitat Quality

Zingraff‐Hamed

Noack

Greulich

et al. 2018

Water

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Abstract:The increase in minimum flows has rarely been considered to mitigate the ecological impact of hydroelectric power plants because it requires a site-specific design and expensive long-term monitoring procedure to identify the most beneficial scenario. This study presents a model-based method to estimate, within the model constraints, the most sustainable scenario of water resource sharing between nature and human needs. We studied physical habitat suitability of the Isar River in Munich (Germany) for three protected fish species: Thymallus thymallus L., Hucho hucho L., and Chondostroma nasus L. The analysis combined a high-resolution two-dimensional (2D) hydromorphological model with expert-based procedures using Computer Aided Simulation Model for Instream Flow Requirements (CASiMIR). We simulated a range of minimum discharges from 5 to 68.5 m 3 /s and four scenarios: (A) maximum use of the resource for humans; (B) slight increase in the minimum water flow; (C) medium increase in the minimum water flow; and, (D) without diversion for hydroelectric production. Under the current hydromorphological conditions, model outputs showed that different life stages of the fish species showed preferences for different scenarios, and that none of the four scenarios provided permanently suitable habitat conditions for the three species. We suggest that discharge management should be combined with hydromorphological restoration actions to re-establish parts of the modified channel slope and/or parts of the previously lost floodplain habitat in order to implement a solution that favors all species at the same time. The modeling procedure that is presented may be helpful to identify the discharge scenario that is most efficient for maintaining target fish species under realistic usage conditions.

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Habitat preference by grayling (Thymallus thymallus) in an artificially modified, hydropeaking riverbed: a contribution to understand the effectiveness of habitat enhancement measures

Cited by 44 publications

References 25 publications

Evaluation of instream habitat enhancement options using fish habitat simulations: case-studies in the river Pas (Spain)

Evaluation of instream habitat enhancement options using fish habitat simulations: case-studies in the river Pas (Spain)

Green hydropower: a new assessment procedure for river management

Model-Based Evaluation of the Effects of River Discharge Modulations on Physical Fish Habitat Quality

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