scholarly journals Modeling the Physical Nexus across Water Supply, Wastewater Management and Hydropower Generation Sectors in River–Reservoir Systems

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 822 ◽  
Author(s):  
Dedi Liu ◽  
Jiayu Zhang ◽  
Yujie Zeng ◽  
Youjiang Shen
Keyword(s):  
Water Quality ◽  
Boundary Conditions ◽  
Water Supply ◽  
Water Inflow ◽  
Wastewater Management ◽  
Hydropower Generation ◽  
Reservoir System ◽  
River Reservoir ◽  
Protection And Utilization ◽  
Wastewater Pollutants

Most water supply and hydropower generation is obtained from the river–reservoir system, and wastewater pollutants are also dumped into the system. Increasing water demand and consumption have caused the water supply, wastewater pollutant management and hydropower generation sectors to be interlinked and to reinforce each other in the system. A physical nexus across water supply, wastewater management and hydropower generation sectors for a river–reservoir system was developed based on the analytical water quality and hydropower generation equations. Considering the Jinghong hydropower reservoir, located in the middle and lower reaches of the Lancangjiang River Basin, as a case study, both the wastewater pollutant management target and water inflow from the upstream as the external and boundary conditions, were employed to establish the effects of the external and boundary conditions on the nexus. It was demonstrated that the nexus of water supply and hydropower generation sectors does not vary with the water quality indicators and its protection target, without the separation of environmental flow in hydropower generation flow. In addition, the amount of hydropower generation decreases with increasing water supply. However, the lapse rates of allowable wastewater pollutants–water supply differ based on the water inflow and the wastewater pollutant management sectors, while the efficiency of hydropower generation and the sensitivity of allowable wastewater pollutants per amount of water supply are considered to be unrelated to the water inflow and wastewater pollutant management target conditions. The quantitative nexus developed through the proposed equation not only contributes to a more complete understanding of the mechanism of cross-connections, but also in creation of specific water protection and utilization measures, which is also the focus of the water–energy nexus.

scholarly journals Climate change adaptation: a pragmatic approach for assessing vulnerability

2018 ◽  
Vol 14 (1) ◽  
pp. 172-177
Author(s):  
M. Carvalho ◽  
B. Martins ◽  
J. P. Coelho ◽  
N. Brôco ◽  
A. K. Ribeiro ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Quality ◽  
Water Supply ◽  
Climate Change Adaptation ◽  
Climate Extremes ◽  
Mediterranean Area ◽  
Wastewater Management ◽  
Water Sector ◽  
Events Data ◽  
Impacts Of Climate Change

Abstract The impacts of climate change on society are becoming increasingly evident. The water sector is sensitive to variations in climatic patterns as it is expected that major changes in flows will occur, along with increased risks of water quality degradation and flooding. According to published climate scenarios the Mediterranean area will become dryer. As a leading group operating in the water sector in Portugal, AdP decided to develop a strategic plan for climate change adaptation with the aim of establishing a strategy for reducing business vulnerability and increasing systems resilience. In developing the plan, a pragmatic method was adopted for characterizing current vulnerabilities. This was founded on the bottom-up approach and supported with past events data, including evaluating their impacts, and the adaptive capacity of systems and utilities to climate extremes. In water supply, the effects of more severe and frequent extreme events are being felt with respect to water quality and availability, representing as much as 80% of the events studied, whereas, in terms of sanitation, floods account for about 90% of events identified. Globally, 78% and 21% of the measures adopted in water supply and wastewater management, respectively, were effective.

scholarly journals A Coupled Modeling Approach for Water Management in a River–Reservoir System

2019 ◽  
Vol 16 (16) ◽  
pp. 2949 ◽  
Author(s):  
Zhenyu Zhang ◽  
Jinliang Huang ◽  
Min Zhou ◽  
Yaling Huang ◽  
Yimin Lu
Keyword(s):  
Water Management ◽  
Water Quality ◽  
Water Resource Management ◽  
Water Movement ◽  
Hydrodynamic Characteristics ◽  
Watershed Model ◽  
Coupled Modeling ◽  
Reservoir System ◽  
Modeling Approach ◽  
River Reservoir

A coupled model is an effective tool to understand the nutrient fate associated with hydrodynamic and ecosystem processes and thereby developing a water resource management strategy. This paper presents a coupled modeling approach that consists of a watershed model and a hydrodynamic model to evaluate the nutrient fate in a river–reservoir system. The results obtained from the model showed a good agreement with field observations. The results revealed that the Shuikou reservoir (Fuzhou, China)exhibited complicated hydrodynamic characteristics, which may induce the pattern of nutrient export. Reservoirs can greatly lower water quality as a result of decreasing water movement. Three scenarios were analyzed for water management. The NH3-N (Ammonia Nitrogen) decreased sharply in the outlet of Shuikou reservoir after NH3-N level in its tributary was reduced. After removing the farming cages, the water quality of the outlet of Shuikou reservoir was improved significantly. The DO (Dissolved Oxygen) had increased by 3%–10%, NH3-N had reduced by 5%–17%, and TP (Total Phosphorus) had reduced by 6%–21%. This study demonstrates that the proposed coupled modeling approach can effectively characterize waterway risks for water management in such a river–reservoir system.

scholarly journals Verification of FPA and PSO algorithms for rule curve extraction and optimization of single- and multi-reservoir systems' operations considering their specific purposes

2020 ◽  
Author(s):  
Omid Bozorg-Haddad ◽  
Marzie Azad ◽  
Elahe Fallah-Mehdipour ◽  
Mohammad Delpasand ◽  
Xuefeng Chu
Keyword(s):  
Water Supply ◽  
Heuristic Algorithms ◽  
Optimal Operation ◽  
Optimal Solutions ◽  
Hydropower Generation ◽  
System Operation ◽  
Calculation Time ◽  
Reservoir System ◽  
Reservoir Systems ◽  
Rule Curve

Abstract The optimal operation of reservoirs is known as a complex issue in water resources management, which requires consideration of numerous variables (such as downstream water demand and power generation). For this optimization, researchers have used evolutionary and meta-heuristic algorithms, which are generally inspired by nature. These algorithms have been developed to achieve optimal/near-optimal solutions by a smaller number of function evaluations with less calculation time. In this research, the flower pollination algorithm (FPA) was used to optimize: (1) Aidoghmoush single-reservoir system operation for agricultural water supply, (2) Bazoft single-reservoir system operation for hydropower generation, (3) multi-reservoir system operation of Karun 5, Karun 4, and Bazoft, and (4) Bazoft single-reservoir system for rule curve extraction. To demonstrate the effectiveness of the FPA, it was first applied to solve the mathematical test functions, and then used to determine optimal operations of the reservoir systems with the purposes of downstream water supply and hydropower generation. In addition, the FPA was compared with the particle swarm optimization (PSO) algorithm and the non-linear programming (NLP) method. The results for the Aidoghmoush single-reservoir system showed that the best FPA solution was similar to the NLP solution, while the best PSO solution was about 0.2% different from the NLP solution. The best values of the objective function of the PSO were approximately 3.5 times, 28%, and 43% worse than those of the FPA for the Bazoft single-reservoir system for hydropower generation, the multi-reservoir system, and the Bazoft single-reservoir system for rule curve extraction, respectively. The FPA outperformed the PSO in finding the optimal solutions. Overall, FPA is one of the new evolutionary algorithms, which is capable of determining better (closer to the ideal solution) objective functions, decreasing the calculation time, simplifying the problem, and providing better solutions for decision makers.

scholarly journals Determination of Changes in the Quality of Surface Water in the River—Reservoir System

2021 ◽  
Vol 13 (6) ◽  
pp. 3457
Author(s):  
Łukasz Gruss ◽  
Mirosław Wiatkowski ◽  
Krzysztof Pulikowski ◽  
Andrzej Kłos
Keyword(s):  
Water Pollution ◽  
Water Quality ◽  
Statistical Analysis ◽  
Surface Water ◽  
Multivariate Statistical Analysis ◽  
Quality Data ◽  
Multivariate Statistical ◽  
Reservoir System ◽  
River Reservoir ◽  
Quality Profile

Assessing the changing parameters of water quality at different points in the river–reservoir system can help prevent river pollution and implement remedial policies. It is also crucial in modeling water resources. Multivariate statistical analysis is useful for the analysis of changes in surface water quality. It helps to identify indicators that may be responsible for the eutrophication process of a reservoir. Additionally, the analysis of the water quality profile and the water quality index (WQI) is useful in assessing water pollution. These tools can support and verify the results of a multivariate statistical analysis. In this study, changes in water quality parameters of the Turawa reservoir (TR), and the Mała Panew river at the point below the Turawa reservoir (bTR) and above the Turawa reservoir (aTR), were analyzed. The analyzed period was from 2019 to 2020 (360 samples were analyzed). It was found that TN, NO2-N, and NO3-N decreased after passing through the Turawa reservoir. Nevertheless, principal component analysis (PCA) and redundancy analysis (RDA) showed that NO2-N and NO3-N contribute to the observed variability of the water quality in the river-reservoir system. PCA showed that pH and PO4-P had a lower impact on the water quality in the reservoir than nitrogen compounds. Additionally, RDA proved that the values of the NO3-N and NO2-N indicators obtained the highest values at the aTR point, PO4-P at the bTR, and pH at the TR. This allows the conclusion that the Turawa reservoir reduced the concentration of NO2-N and NO3-N in comparison with the concentration of these compounds flowing into the reservoir. PCA and RDA showed that both parameters (NO2-N and NO3-N) may be responsible for the eutrophication process of the Turawa reservoir. The analysis of short-term changes in water quality data may reveal additional sources of water pollution. High temperatures and alkaline reaction may cause the release of nitrogen and phosphorus compounds from sediments, which indicates an increased concentration of TP, PO4-P, and Norg in the waters at the TR point, and TP, PO4-P, and NH4-N concentrations at the bTR point. The water quality profile combined with PCA and RDA allows more effective monitoring for the needs of water management in the reservoir catchment area. The analyzed WQI for water below the reservoir (bTR) was lower than that of the reservoir water (TR), which indicates an improvement in water after passing through the reservoir.

Integrated watershed management efforts: case study from Melen Watershed experiencing interbasin water transfer

2013 ◽  
Vol 13 (5) ◽  
pp. 1272-1280 ◽  
Author(s):  
I. Ozturk ◽  
A. Erturk ◽  
A. Ekdal ◽  
M. Gurel ◽  
E. Cokgor ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Supply ◽  
Action Plan ◽  
Pollution Prevention ◽  
Water Transfer ◽  
Wastewater Management ◽  
Prevention Measures ◽  
Watershed Protection ◽  
Interbasin Water Transfer ◽  
The Government

Istanbul is a megacity with a population of over 13 million. Due to experienced droughts and population growth in the city, interbasin water transfer from Melen Watershed was considered as the most feasible alternative to supply water that can compensate for water demand in the future. This decision changed the beneficial use of the Melen Watershed from irrigation water supply to drinking water supply and necessitated extensive pollution prevention measures to comply with the new water quality requirements. A Watershed Protection Action Plan was developed for the sustainable management of Melen Watershed. The action plan included measures concerning wastewater management, diffuse pollution management, solid waste management and water quality monitoring. In this paper, proposed protection actions in the plan are provided together with the activities realized so far. In addition, the changes made by the authorities during implementation of the plan are presented. The proposed Watershed Protection Action Plan as approved by the government is one of the first examples in Turkey, where watershed-based planning of water resources is implemented instead of administrative boundary-based management.

scholarly journals Response of bacterial communities to variation in water quality and physicochemical conditions in a river-reservoir system

2021 ◽  
Vol 27 ◽  
pp. e01541
Author(s):  
Jingting Wang ◽  
Hanbing Fan ◽  
Xiaojia He ◽  
Fangbo Zhang ◽  
Jianbo Xiao ◽  
...  
Keyword(s):  
Water Quality ◽  
Bacterial Communities ◽  
Reservoir System ◽  
Physicochemical Conditions ◽  
River Reservoir

scholarly journals Mitigate water shortage by improving hydropower generation strategy of the cascade reservoir system in the Be River Basin, Vietnam

2020 ◽  
Vol 20 (8) ◽  
pp. 3216-3232
Author(s):  
Nguyen Thi Thuy Linh ◽  
Frederick N.-F. Chou
Keyword(s):  
Water Resources ◽  
Water Supply ◽  
River Basin ◽  
Water Resources Management ◽  
Water Allocation ◽  
Water Shortage ◽  
Hydropower Generation ◽  
Water Shortages ◽  
Resources Management ◽  
Reservoir System

Abstract To meet increasing water consumption with limited water resources, management approaches that transfer water between purposes must be improved for sustainable development. This entails an urgent requirement for appropriate water resources management within water–energy interaction if severe water shortage occurs occasionally. This study evaluates hydropower generation policies of a cascade reservoir system in the Be River Basin in terms of security of water supply and energy production. The Generalized Water Allocation Simulation Model (GWASIM) was applied to simulate the water use of a complex system of hydropower generation and water supply. Two water allocation scenarios and six alternatives defined by varying monthly generating hours were modeled and compared. The results demonstrate that a compromise between hydropower generation and water supply can be negotiated to reduce the severity of water shortages. Different monthly hours of hydropower generation among alternatives show an effect on improving power production and reliable water supply. This study provides overall insight into the performance of a multi-purpose cascade reservoir system. It will provide a foundation for improving future study of reservoir operations in meeting the increasing demands of water and energy in Vietnam.

scholarly journals Optimizing the Management Strategies of a Multi-Purpose Multi-Reservoir System in Vietnam

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 938
Author(s):  
Frederick N.-F. Chou ◽  
Nguyen Thi Thuy Linh ◽  
Chia-Wen Wu
Keyword(s):  
Water Supply ◽  
River Basin ◽  
Management Strategies ◽  
Water Shortage ◽  
Hydropower Generation ◽  
Water Shortages ◽  
Global Trends ◽  
Reservoir System ◽  
System A

Resource shortages are having an increasingly severe impact as global trends like rapid population growth, urbanization, economic development, and climate change unfold. Moreover, rising living standards across many regions are also affecting water and energy resources. This entails an urgent requirement to improve water resources management. An important improvement is to transfer water between the different uses of the reservoir system. A compromise between the needs of hydropower generation and the water supply can be negotiated for the reservoir system to reduce the severity of water shortages. The Be River basin in Vietnam was selected as a case study to investigate. The combination of the generalized water allocation simulation model (GWASIM) and the bounded optimization by quadratic approximation (BOBYQA) algorithm was applied to optimize hydropower generation in various water shortage scenarios. The results present optimized hydropower generation policies for cascade reservoirs that would significantly improve the present operating policy in terms of both the water supply and hydropower generation. Moreover, multiple scenarios will provide flexibility to the reservoir operator by giving the relationship between water and energy. Given water supply conditions, the operator will be able to choose among several optimal solutions to ensure greater water resource efficiency in the Be River basin.

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