scholarly journals Fish behavior and fish guidance at hydropower intake screens for fish downstream passage

2018 ◽  
Vol 40 ◽  
pp. 03041 ◽  
Author(s):  
Franz Geiger ◽  
Mathilde Cuchet ◽  
Peter Rutschmann
Keyword(s):  
Large Scale ◽  
Fish Behavior ◽  
Small Fish ◽  
Hydraulic Parameters ◽  
Field Observations ◽  
Fish Behaviour ◽  
Hydropower Plants ◽  
Hydraulic Design ◽  
Passage Efficiency ◽  
Fish Protection

Fish behaviour investigations under controlled laboratory conditions but nature like environment were conducted to clarify the efficiency of inclined and horizontal screen planes for fish protection and fish downstream passage at hydropower plants concerning different potamodromous species and various sizes. The dependency on the underlying geometric and hydraulic parameters was investigated and comprehensive models were deduced to describe these relations. Adequate geometric and hydraulic design could achieve high levels of fish protection and downstream passage efficiency, even for small fish, weak swimmers and riverbed/bottom oriented species. The results imply good transferability and accordance with field observations at large scale facilities and can provide valuable information for facility design.

scholarly journals Ethohydraulic experiments on the fish protection potential of the hybrid system FishProtector at hydropower plants

2021 ◽  
Vol 171 ◽  
pp. 106370
Author(s):  
Ruben Tutzer ◽  
Simon Röck ◽  
Janette Walde ◽  
Bernhard Zeiringer ◽  
Günther Unfer ◽  
...  
Keyword(s):  
Hybrid System ◽  
Hydropower Plants ◽  
Protection Potential ◽  
Fish Protection

scholarly journals A Parametric Approach for Determining Fishway Attraction Flow at Hydropower Dams

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 743
Author(s):  
Patrick Heneka ◽  
Markus Zinkhahn ◽  
Cornelia Schütz ◽  
Roman B. Weichert
Keyword(s):  
Input Data ◽  
Design Criterion ◽  
Hydraulic Parameters ◽  
Parametric Approach ◽  
Temporal Complexity ◽  
Hydropower Plants ◽  
Hydropower Dams ◽  
Migration Corridor ◽  
Zone Characteristic ◽  
Good Agreement

High discharges at hydropower plants (HPP) may mask fishway attraction flows and, thereby, prevent fishes from locating and using fishways critical for their access to upstream spawning and rearing habitats. Existing methods for determining attraction flows are either based on simple guidelines (e.g., a proportion of HPP discharge) that cannot address the spatial and temporal complexity of tailrace flow patterns or complicated studies (e.g., combinations of detailed hydraulic and biological investigations) that are expensive and time-consuming. To bridge this gap, we present a new, intermediate approach to reliably determine attraction flows for technical fishways at small to medium-sized waterways (mean annual flow up to 400 m3/s). Fundamental to our approach is a design criterion that the attraction flow should maintain its integrity as it propagates downstream from the fishway entrance to beyond the highly turbulent zone characteristic of HPP tailraces to create a discernable migration corridor connecting the fishway entrance to the downstream river. To implement this criterion, we describe a set of equations to calculate the width of the entrance and the corresponding attraction discharge. Input data are usually easy to obtain and include geometrical and hydraulic parameters describing the target HPP and its tailrace. To confirm our approach, we compare model results to four sites at German waterways where the design of attraction flow was obtained by detailed experimental and numerical methods. The comparison shows good agreement supporting our approach as a useful, intermediate alternative for determining attraction flows that bridges the gap between simple guidelines and detailed hydraulic and biological investigations.

scholarly journals Long-Term Generation Scheduling for Cascade Hydropower Plants Considering Price Correlation between Multiple Markets

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2239
Author(s):  
Bin Luo ◽  
Shumin Miao ◽  
Chuntian Cheng ◽  
Yi Lei ◽  
Gang Chen ◽  
...  
Keyword(s):  
Electricity Market ◽  
Large Scale ◽  
Copula Function ◽  
Market Environment ◽  
Scheduling Model ◽  
Multiple Markets ◽  
Generation Scheduling ◽  
Hydropower Plants ◽  
Proposed Model

The large-scale cascade hydropower plants in southwestern China now challenge a multi-market environment in the new round of electricity market reform. They not only have to supply the load for the local provincial market, but also need to deliver electricity to the central and eastern load centers in external markets, which makes the generation scheduling much more complicated, with a correlated uncertain market environment. Considering the uncertainty of prices and correlation between multiple markets, this paper has proposed a novel optimization model of long-term generation scheduling for cascade hydropower plants in multiple markets to seek for the maximization of overall benefits. The Copula function is introduced to describe the correlation of stochastic prices between multiple markets. The price scenarios that obey the Copula fitting function are then generated and further reduced by using a scenario reduction strategy that combines hierarchical clustering and inconsistent values. The proposed model is applied to perform the long-term generation scheduling for the Wu River cascade hydropower plants and achieves an increase of 106.93 million yuan of annual income compared with the conventional scheduling model, without considering price scenarios, showing better performance in effectiveness and robustness in multiple markets.

Generalized Hydraulic Calculation Method Using Rational Polynomial Model

2005 ◽  
Vol 127 (1) ◽  
pp. 15-25 ◽  
Author(s):  
Ali A. Pilehvari ◽  
Robert W. Serth
Keyword(s):  
Experimental Data ◽  
Large Scale ◽  
Polynomial Model ◽  
Hydraulic Calculation ◽  
Drilling Fluids ◽  
Hydraulic Parameters ◽  
Calculation Technique ◽  
Rational Polynomial ◽  
Laminar And Turbulent Flow ◽  
Large Scale Flow

A generalized hydraulic calculation technique is presented that requires, as input, only the raw rheological data for the fluid and the values of the relevant hydraulic parameters. The method utilizes a powerful new rheological model called the Rational Polynomial model, which is capable of accurately representing the rheogram of virtually any time-independent fluid. Predictions of the new method are compared with published experimental data gathered from large-scale flow loops. The tested cases include laminar and turbulent flow for a variety of drilling fluids in both pipes and concentric annuli.

Hydropower set to boost African electricity capacity

2017 ◽  
Keyword(s):  
Large Scale ◽  
Dam Reservoir ◽  
Drought Vulnerability ◽  
Content Type ◽  
Southern States ◽  
Hydropower Plants ◽  
Hydropower Potential

Subject African hydropower. Significance Africa’s hydropower potential is estimated to be more than 300,000 megawatts, much the same as that of Europe. While Europe has harnessed more than 218,000 megawatts of its hydropower endowment, Africa has barely tapped 30,000 megawatts. Africa added a mere 700 megawatts of new hydropower capacity in 2015 -- the least of any region. However, a series of transformative projects already underway could see this figure rise exponentially in the coming years as scores of new national and regional hydropower plants come online. Impacts As the Grand Ethiopian Renaissance Dam reservoir starts filling, tensions with Egypt may rise. An over-reliance on hydropower could leave countries vulnerable to decreased rainfall, especially as climates change. Drought vulnerability will prompt southern states to consider energy diversification. Large-scale hydropower projects may benefit industries over households in need of electricity.

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