scholarly journals Design of regulated ford on the roads of low traffic intensity at the crossing of torrential flows

2002 ◽  
pp. 59-68
Author(s):  
Vojislav Djekovic ◽  
Bogdan Stefanovic
Keyword(s):  
Flow Regime ◽  
High Water ◽  
Water Levels ◽  
Traffic Intensity ◽  
Hydraulic Characteristics ◽  
Natural Flow Regime ◽  
Engineering Structure ◽  
Method Of Calculation ◽  
Natural Flow ◽  
Low Traffic

Regulation works in small torrential streams disturb the natural flow regime and the structure of banks and riparian area. The streams are crossed by bridges and culverts. However, at places of low traffic intensity, natural fords are often used for crossing. A regulated ford is constructed by lining and protection of the natural ford, where due to reduced roughness in the ford zone, hydraulic characteristics of the stream show a series of specificities This paper presents the method of calculation of hydraulic factors, which determine the conditions of regulated ford. The construction of regulated ford, as a civil engineering structure, is designed in the conditions enabling a safe traffic at low and medium discharges, while at high water levels there are no obstacles to the flow of water and torrential sediment .

Restoring the natural flow regime of a large hydroelectric complex: Costs and considerations

Energy ◽  
2020 ◽  
Vol 190 ◽  
pp. 116260 ◽  
Author(s):  
Jeff Opgrand ◽  
Paul V. Preckel ◽  
F.T. Sparrow ◽  
Gregory Thomas ◽  
Daniel P. Loucks
Keyword(s):  
Flow Regime ◽  
Natural Flow Regime ◽  
Natural Flow

Predicting the natural flow regime: models for assessing hydrological alteration in streams

2009 ◽  
pp. n/a-n/a ◽  
Author(s):  
Daren M. Carlisle ◽  
James Falcone ◽  
David M. Wolock ◽  
Michael R. Meador ◽  
Richard H. Norris
Keyword(s):  
Flow Regime ◽  
Natural Flow Regime ◽  
Hydrological Alteration ◽  
Natural Flow

Assessment of the natural flow regime in a Mediterranean river impacted from irrigated agriculture

2016 ◽  
Vol 573 ◽  
pp. 1492-1502 ◽  
Author(s):  
Konstantinos Stefanidis ◽  
Yiannis Panagopoulos ◽  
Alexandros Psomas ◽  
Maria Mimikou
Keyword(s):  
Flow Regime ◽  
Irrigated Agriculture ◽  
Natural Flow Regime ◽  
Mediterranean River ◽  
Natural Flow

scholarly journals Portfolio optimisation for hydropower producers that balances riverine ecosystem protection and producer needs

2013 ◽  
Vol 10 (12) ◽  
pp. 15841-15869
Author(s):  
X. A. Yin ◽  
Z. F. Yang ◽  
C. L. Liu
Keyword(s):  
Flow Regime ◽  
Electricity Markets ◽  
Economic Benefits ◽  
Portfolio Optimisation ◽  
Hydropower Generation ◽  
Natural Flow Regime ◽  
Riverine Ecosystem ◽  
Riverine Ecosystems ◽  
Ecosystem Protection ◽  
Natural Flow

Abstract. In deregulated electricity markets, hydropower portfolio design has become an essential task for producers. The previous research on hydropower portfolio optimisation focused mainly on the maximisation of profits but did not take into account riverine ecosystem protection. Although profit maximisation is the major objective for producers in deregulated markets, protection of riverine ecosystems must be incorporated into the process of hydropower portfolio optimisation, especially against a background of increasing attention to environmental protection and stronger opposition to hydropower generation. This research seeks mainly to remind hydropower producers of the requirement of river protection when they design portfolios and help shift portfolio optimisation from economically oriented to ecologically friendly. We establish a framework to determine the optimal portfolio for a hydropower reservoir, accounting for both economic benefits and ecological needs. In this framework, the degree of natural flow regime alteration is adopted as a constraint on hydropower generation to protect riverine ecosystems, and the maximisation of mean annual revenue is set as the optimisation objective. The electricity volumes assigned in different electricity sub-markets are optimised by the noisy genetic algorithm. The proposed framework is applied to China's Wangkuai Reservoir to test its effectiveness. The results show that the new framework could help to design eco-friendly portfolios that can ensure a planned profit and reduce alteration of the natural flow regime.

scholarly journals Designing flow regimes to support entire river ecosystems

2020 ◽  
Author(s):  
Jonathan D. Tonkin ◽  
Julian D. Olden ◽  
David. M. Merritt ◽  
Lindsay V. Reynolds ◽  
Jane S. Rogosch ◽  
...  
Keyword(s):  
Flow Regime ◽  
Riparian Vegetation ◽  
Flow Regimes ◽  
Flow Management ◽  
Natural Flow Regime ◽  
Management Actions ◽  
Ecosystem Effects ◽  
Decadal Scale ◽  
Natural Flow ◽  
Multispecies Modeling

AbstractOvercoming the challenges of water scarcity will require creative approaches to flow management and modeling approaches that forecast the effects of management actions on multiple ecosystem components simultaneously. Using a mechanistic multispecies modeling approach, we investigated the cross-ecosystem effects of environmental flow regimes designed for specific ecosystem outcomes. We reveal tradeoffs associated with flow regimes targeting riparian vegetation, fishes, and invertebrates. The different frequencies associated with each flow regime in some cases caused non-target ecosystem components to become locally extirpated within short (decadal) timespans. By incorporating multiple flow frequencies (from intraannual-scale pulses to large decadal-scale floods), the natural flow regime enabled a balanced but sub-optimal response of the three ecosystem components (mean 72% of designer flow). Although returning to a natural flow regime may not be possible in highly managed rivers, novel flow regimes must incorporate diverse frequencies inherent to such a regime and accommodate the sometimes conflicting requirements of different taxa at different times.

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