Modeling Unsteady Flow Characteristics of Hydropeaking Operations and Their Implications on Fish Habitat
Reservoir releases associated with energy production and flood mitigation need to be reconciled with efforts to maintain healthy ecosystems in regulated rivers. Unsteady flow phenomena caused by hydropeaking operations typically affect riverbed erosion and fish displacement. A three-dimensional hydr...
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          | Published in | Journal of hydraulic engineering (New York, N.Y.) Vol. 136; no. 12; pp. 1053 - 1066 | 
|---|---|
| Main Authors | , | 
| Format | Journal Article | 
| Language | English | 
| Published | 
            American Society of Civil Engineers
    
        01.12.2010
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| Subjects | |
| Online Access | Get full text | 
| ISSN | 0733-9429 1943-7900  | 
| DOI | 10.1061/(ASCE)HY.1943-7900.0000112 | 
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| Abstract | Reservoir releases associated with energy production and flood mitigation need to be reconciled with efforts to maintain healthy ecosystems in regulated rivers. Unsteady flow phenomena caused by hydropeaking operations typically affect riverbed erosion and fish displacement. A three-dimensional hydrodynamic model is used to simulate the flow characteristics during the passage of the rising limb of an observed hydropeaking event in a gravel-bed reach of Smith River, Virginia. The calculated time-dependent water surface elevations, velocities, and shear stresses are compared with field measurements. Further, comparison based on numerical simulations of this historical and a hypothetical “staggering” hydropeaking event reveals that the latter has the capability of reducing the area subject to erosion and prolonging refugia availability for juvenile brown trout. Issues related to the adoption of either a truly dynamic modeling approach or a quasi-steady methodology for simulating unsteady flows are examined through a proposed unsteadiness flow parameter. The insights obtained from this study can assist in properly accounting for the impact of hydropeaking operations on fish habitat and instream flow management. | 
    
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| AbstractList | Reservoir releases associated with energy production and flood mitigation need to be reconciled with efforts to maintain healthy ecosystems in regulated rivers. Unsteady flow phenomena caused by hydropeaking operations typically affect riverbed erosion and fish displacement. A three-dimensional hydrodynamic model is used to simulate the flow characteristics during the passage of the rising limb of an observed hydropeaking event in a gravel-bed reach of Smith River, Virginia. The calculated time-dependent water surface elevations, velocities, and shear stresses are compared with field measurements. Further, comparison based on numerical simulations of this historical and a hypothetical “staggering” hydropeaking event reveals that the latter has the capability of reducing the area subject to erosion and prolonging refugia availability for juvenile brown trout. Issues related to the adoption of either a truly dynamic modeling approach or a quasi-steady methodology for simulating unsteady flows are examined through a proposed unsteadiness flow parameter. The insights obtained from this study can assist in properly accounting for the impact of hydropeaking operations on fish habitat and instream flow management. | 
    
| Author | Diplas, Panayiotis Shen, Yi  | 
    
| Author_xml | – sequence: 1 givenname: Yi surname: Shen fullname: Shen, Yi email: yi.shen@tpwd.state.tx.us organization: Texas Parks and Wildlife Dept. , , Austin, TX 78744. E-mail – sequence: 2 givenname: Panayiotis surname: Diplas fullname: Diplas, Panayiotis email: pdiplas@vt.edu organization: Virginia Polytechnic Institute and State Univ. , Baker Environmental Hydraulics Laboratory, Dept. of Civil and Environmental Engineering, , Blacksburg, VA 2406 (corresponding author). E-mail  | 
    
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| Title | Modeling Unsteady Flow Characteristics of Hydropeaking Operations and Their Implications on Fish Habitat | 
    
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