scholarly journals Reducing the conflict of interest in the optimal operation of reservoirs by linking mesohabitat hydraulic modeling and metaheuristic optimization

2021 ◽  
Author(s):  
Mahdi Sedighkia ◽  
Bithin Datta ◽  
Asghar Abdoli
Keyword(s):  
Environmental Impact ◽  
Water Supply ◽  
Differential Evolution ◽  
Environmental Impacts ◽  
Reservoir Operation ◽  
Differential Evolution Algorithm ◽  
Hydraulic Modeling ◽  
Optimal Operation ◽  
Metaheuristic Optimization

Abstract The present study proposes a novel framework to optimize the reservoir operation through linking mesohabitat hydraulic modeling and metaheuristic optimization to mitigate environmental impact at downstream of the reservoir. Environmental impact function was developed by mesohabitat hydraulic simulation. Then, the developed function was utilized in the structure of the reservoir operation optimization. Different metaheuristic algorithms including practice swarm optimization, invasive weed optimization, differential evolution and biogeography-based algorithm were used to optimize reservoir operation. Root mean square error (RMSE) and reliability index were utilized to measure the performance of algorithms. Based on the results in the case study, the proposed method is robust for mitigating downstream environmental impacts and sustaining water supply by the reservoir. RMSE for mesohabitats is 8% that indicates the robustness of proposed method to mitigate environmental impacts at downstream. It seems that providing environmental requirements might reduce the reliability of water supply considerably. Differential evolution algorithm is the best method to optimize reservoir operation in the case study.

scholarly journals Sustainability assessment and environmental impacts of water supply systems: a case study in Tampa Bay water supply system

2021 ◽  
Vol 308 ◽  
pp. 01010
Author(s):  
Shen Yizhi ◽  
Wei Minrui ◽  
Hou Bowen
Keyword(s):  
Energy Consumption ◽  
Surface Water ◽  
Water Supply ◽  
Environmental Impacts ◽  
Carbon Dioxide Emissions ◽  
Public Awareness ◽  
Tampa Bay ◽  
Water Supply Systems ◽  
Supply Systems

Due to the accelerated industrial and urbanization development, climate change, and increasing populations and life quality expectations, the issue of drinking water shortage has raised much public awareness. The desalination system has been widely applied to accommodate the growing demand for clean water resources despite the continuous concerns about its relatively higher energy consumption and environmental footprints. This research conducted a case study in the Tampa Bay Regional Surface Water Treatment Plant and Tampa Bay Seawater Desalination Plant in Florida, U.S. It analysed the performance and environmental impacts of conventional and desalination water supply systems on three sides: energy consumption, carbon footprint, and solid waste. Potential negative effects of both water supply systems are generally associated with surface water ecology, groundwater aquifers, coastal environment, and marine organisms. Various environmental impact mitigation plans have been proposed to prevent or restore the detriments caused by carbon dioxide emissions, plant construction, and concentrated brine discharge. Due to the deficiency in freshwater resources, desalination technology is more promising through proper regulations and regional sustainable development.

A binary differential evolution algorithm for airline revenue management: a case study

2020 ◽  
Vol 24 (18) ◽  
pp. 14221-14234
Author(s):  
Amir Karbassi Yazdi ◽  
Mohamad Amin Kaviani ◽  
Thomas Hanne ◽  
Andres Ramos
Keyword(s):  
Differential Evolution ◽  
Revenue Management ◽  
Differential Evolution Algorithm ◽  
Airline Revenue Management ◽  
Evolution Algorithm ◽  
Binary Differential Evolution

scholarly journals Optimal Operation of Cascade Reservoirs for Flood Control of Multiple Areas Downstream: A Case Study in the Upper Yangtze River Basin

Water ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1250 ◽  
Author(s):  
Chao Zhou ◽  
Na Sun ◽  
Lu Chen ◽  
Yi Ding ◽  
Jianzhong Zhou ◽  
...  
Keyword(s):  
Reservoir Operation ◽  
Yangtze River ◽  
Flood Control ◽  
Optimal Operation ◽  
Control Points ◽  
Operation Model ◽  
Cascade Reservoirs ◽  
Upper Yangtze River ◽  
The Upper Yangtze River

The purpose of a flood control reservoir operation is to prevent flood damage downstream of the reservoir and the safety of the reservoir itself. When a single reservoir cannot provide enough storage capacity for certain flood control points downstream, cascade reservoirs should be operated together to protect these areas from flooding. In this study, for efficient use of the reservoir storage, an optimal flood control operation model of cascade reservoirs for certain flood control points downstream was proposed. In the proposed model, the upstream reservoirs with the optimal operation strategy were considered to reduce the inflow of the reservoir downstream. For a large river basin, the flood routing and time-lag cannot be neglected. So, dynamic programming (DP) combined with the progressive optimality algorithm (POA) method, DP-POA, was proposed. Thus, the innovation of this study is to propose a two-stage optimal reservoir operation model with a DP-POA algorithm to solve the problem of optimal co-operation of cascade reservoirs for multiple flood control points downstream during the flood season. The upper Yangtze River was selected as a case study. Three reservoirs from upstream to downstream, Xiluodu, Xiangjiaba and the Three Gorges reservoirs (TGR) in the upper Yangtze River, were taken into account. Results demonstrate that the two-stage optimization algorithm has a good performance in solving the cascade reservoirs optimization problem, because the inflow of reservoir downstream and the division volumes were largely reduced. After the optimal operation of Xiluodu and Xiangjiaba reservoirs, the average reduction of flood peak for all these 13 typical flood hydrographs (TFHs) is 13.6%. Meanwhile, the cascade reservoirs can also store much more storm water during a flood event, and the maximum volumes stored in those two reservoirs upstream in this study can reach 25.2 billion m3 during a flood event. Comprising the proposed method with the current operation method, results demonstrate that the flood diversion volumes at the flood control points along the river decrease significantly.

HOW CLEARLY IS CAUSALITY COMMUNICATED IN EIA?

2012 ◽  
Vol 14 (03) ◽  
pp. 1250020 ◽  
Author(s):  
ANASTASSIOS PERDICOÚLIS ◽  
JOHN GLASSON
Keyword(s):  
Environmental Impact ◽  
Impact Assessment ◽  
Environmental Impacts ◽  
Environmental Impact Assessment ◽  
Fundamental Notion ◽  
Study Material ◽  
Analysis Methodology ◽  
Environmental Impact Statements ◽  
The Uk

Causality, or the relation of cause and effect, is a fundamental notion in impact assessment, indicating how impacts arise from development actions. In the context of Environmental Impact Assessment (EIA), recent research in the UK has indicated that impact statements typically do not contain graphic expressions of causality. This article explores the extent to which causality about environmental impacts is described in the text of the Environmental Impact Statements (EIS). The analysis methodology employs two techniques, semantics analysis and transcription of the text into causal digraphs, while the case study material is sampled from ten recent UK and US impact statements. The research indicates in many cases that the communication of causality has faults such as uncertainty or absence of important information, and we highlight the implications for the practice of EIA.

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