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

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

Water Science & Technology Water Supply ◽

10.2166/ws.2020.220 ◽

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.

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Minimizing the impact of vacating instream storage of a multi-reservoir system: a tradeoff study of water supply and empty flushing

10.5194/hess-2020-258 ◽

2020 ◽

Author(s):

Chia-Wen Wu ◽

Frederick N.-F. Chou ◽

Fong-Zuo Lee

Keyword(s):

Water Supply ◽

Water Shortage ◽

The Other ◽

Flood Peak ◽

Reservoir System ◽

System A ◽

Expected Benefits ◽

The Impact ◽

Nonlinear Optimization Algorithm

Abstract. Reservoir operator does not favor storage above a certain level in situations such as the pre-release operation prior to a flood, scheduled engineering constructions or mechanical excavations of sediments in the impoundments, drawdown and empty flushing, etc. This paper selects the last of which as the case study, and a method is presented to promote the feasibility of emptying reservoir storage. The impact of emptying reservoir on water supply is minimized through appropriate joint operation in a multi-reservoir system, where drawdown and empty flushing is carried out in a primary reservoir and the other reservoirs provide backup water for supply. This method prioritizes allocating the storage in the primary reservoir for water supply during specific periods prior to its empty. If the storage of every reservoir achieves its predefined conditions, drawdown of the primary reservoir is activated and followed by empty flushing. Previously preserved storage in the other reservoirs ensures adequate water supply during the periods of emptying the primary reservoir. Flushing of the primary reservoir is continued until either the accumulative released water exceeds the specified volume, storage in the backup reservoirs drops below the pre-defined threshold, or the inflow to the primary reservoir recedes from the flood peak to be below the releasing capacity of outlets. This behavior is simulated and linked with a nonlinear optimization algorithm to calibrate the optimal parameters defining the activation and termination of empty flushing. The optimized strategy limits the incremental water shortage within the acceptable threshold and maximizes the expected benefits of emptying reservoir.

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Minimizing the impact of vacating instream storage of a multi-reservoir system: a trade-off study of water supply and empty flushing

Hydrology and Earth System Sciences ◽

10.5194/hess-25-2063-2021 ◽

2021 ◽

Vol 25 (4) ◽

pp. 2063-2087

Author(s):

Chia-Wen Wu ◽

Frederick N.-F. Chou ◽

Fong-Zuo Lee

Keyword(s):

Water Supply ◽

Water Shortage ◽

The Other ◽

Engineering Construction ◽

Flood Peak ◽

Reservoir System ◽

System A ◽

Expected Benefits ◽

The Impact

Abstract. A reservoir operator does not favor storage above a certain level in situations such as the pre-release operation prior to a flood; scheduled engineering construction; or mechanical excavation of sediment in the impoundments, drawdown, and empty flushing, etc. This paper selects empty flushing as the case study, and a method is presented to promote the feasibility of emptying the reservoir storage. The impact of emptying reservoir on water supply is minimized through appropriate joint operation in a multi-reservoir system, where drawdown and empty flushing is carried out in a primary reservoir, and the other reservoir provides backup water for supply. This method prioritizes allocating the storage in the primary reservoir for water supply during specific periods prior to its emptying. If the storage of every reservoir achieves its predefined conditions, drawdown of the primary reservoir is activated and followed by empty flushing. Previously preserved storage in the other reservoir ensures adequate water supply during the periods of emptying the primary reservoir. Flushing of the primary reservoir is continued until either the accumulative released water exceeds the specified volume, storage in the backup reservoir drops below the predefined threshold, or the inflow to the primary reservoir recedes from the flood peak to be below the releasing capacity of outlets. This behavior is simulated and linked with a nonlinear optimization algorithm to calibrate the optimal parameters defining the activation and termination of empty flushing. The optimized strategy limits the incremental water shortage within the acceptable threshold and maximizes the expected benefits of emptying reservoir.

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Assessment of Future Climate Change Impact on Agricultural Water Supply Capacity in Geum River Basin Using SWAT and MODSIM-DSS

Korean Society of Hazard Mitigation ◽

10.9798/kosham.2020.20.6.55 ◽

2020 ◽

Vol 20 (6) ◽

pp. 55-66

Author(s):

Sehoon Kim ◽

Chunggil Jung ◽

Jiwan Lee ◽

Jinuk Kim ◽

Seongjoon Kim

Keyword(s):

Water Supply ◽

River Basin ◽

Water Shortage ◽

Future Climate Change ◽

Industrial Water ◽

Agricultural Water ◽

Water Shortages ◽

Daily Streamflow ◽

Agricultural Water Supply ◽

Supply Capacity

This study is to evaluate future agricultural water supply capacity in Geum river basin (9,865 km2) using SWAT and MODSIM-DSS. The MODSIM-DSS was established by dividing the basin into 14 subbasins, and the irrigation facilities of agricultural reservoirs, pumping stations, diversions, culverts and groundwater wells were grouped within each subbasin, and networked between subbasins including municipal and industrial water supplies. The SWAT was calibrated and validated using 11 years (2005-2015) daily streamflow data of two dams (DCD and YDD) and 4 years (August 2012 to December 2015) data of three weirs (SJW, GJW, and BJW) considering water withdrawals and return flows from agricultural, municipal, and industrial water uses. The Nash−Sutcliffe efficiency (NSE) of two dam and three weirs inflows were 0.55∼0.70 and 0.57∼0.77 respectively. Through MODSIM-DSS run for 34 years from 1982 to 2015, the agricultural water shortage had occurred during the drought years of 1982, 1988, 1994, 2001 and 2015. The agricultural water shortage could be calculated as 197.8 × 106 m3, 181.9 × 106 m3, 211.5 × 106 m3, 189.2 × 106 m3 and 182.0 × 106 m3 respectively. The big shortages of agricultural water were shown in water resources unit map number of 3004 (Yeongdongcheon) and 3012 (Geumgang Gongju) areas exceeding 25.1 × 106 m3 and 47.4 × 106 m3. From the estimation of future agricultural water requirement using RCP 8.5 INM-CM4 scenario, the 3004 and 3012 areas showed significant water shortages of 26.1 × 106 m3 (104.1%) and 50.9 × 106 m3 (107.4%) in 2080s (2070∼2099) compared to the present shortages. The water shortages decreased to 23.6 × 106 m3 (94.0%) and 43.3 × 106 m3 (91.4%) below of the present shortages by developing irrigation facilities.

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An Ecologically Oriented Operation Strategy for a Multi-Reservoir System: A Case Study of the Middle and Lower Han River Basin, China

Engineering ◽

10.1016/j.eng.2018.09.002 ◽

2018 ◽

Vol 4 (5) ◽

pp. 627-634 ◽

Cited By ~ 3

Author(s):

Hao Wang ◽

Xiaohui Lei ◽

Denghua Yan ◽

Xu Wang ◽

Shuyue Wu ◽

...

Keyword(s):

River Basin ◽

Operation Strategy ◽

Han River ◽

Reservoir System ◽

System A ◽

Han River Basin

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Hydro-Economic Water Allocation Model for Water Supply Risk Analysis: A Case Study of Namhan River Basin, South Korea

Sustainability ◽

10.3390/su13116005 ◽

2021 ◽

Vol 13 (11) ◽

pp. 6005

Author(s):

Gimoon Jeong ◽

Doosun Kang

Keyword(s):

Climate Change ◽

South Korea ◽

Water Supply ◽

River Basin ◽

Water Allocation ◽

Economic Valuation ◽

Supply Risk ◽

Water Shortages ◽

Water Supply Risk

Rational water resource management is used to ensure a stable supply of water by predicting the supply of and demand for future water resources. However, rational water allocation will become more difficult in the future owing to the effects of climate change, causing water shortages and disputes. In this study, an advanced hydro-economic water allocation and management model (WAMM) was introduced by improving the optimization scheme employed in conventional models and incorporating the economic value of water. By relying upon economic valuation, the WAMM can support water allocation efforts that focus not only on the stability but also on the economic benefits of water supply. The water supply risk was evaluated following the different objective functions and optimization methods provided by the WAMM using a case study of the Namhan River basin in South Korea under a climate change scenario over the next 30 years. The water shortages and associated economic damage were compared, and the superior ability of WAMM to mitigate future water shortages using economic valuation and full-step linear programming (FSLP) optimization was demonstrated. It is expected that the WAMM can be applied to help resolve water shortages and disputes among river basin units under severe drought conditions.

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Research on Hedging Rules Based on Water Supply Priority and Benefit Loss of Water Shortage—A Case Study of Tianjin, China

Water ◽

10.3390/w11040778 ◽

2019 ◽

Vol 11 (4) ◽

pp. 778 ◽

Cited By ~ 1

Author(s):

Baohui Men ◽

Zhijian Wu ◽

Huanlong Liu ◽

Yangsong Li ◽

Yong Zhao

Keyword(s):

Water Supply ◽

High Efficiency ◽

Water Shortage ◽

Urban Water ◽

Urban Water Supply ◽

Domestic Water ◽

Water Shortages ◽

Water Users ◽

Hedging Rules

When a city’s water demand cannot be fully satisfied, the hedging rule can reduce water loss by limiting water supply in advance. Based on water supply priority and benefit loss of water shortage for different users, this paper improved the objective function of hedging rules considering the benefit loss of water shortage. At the same time, according to the idea of restricting water supply by water users in turn, improved hedging rules (IHR) are applied to the urban water supply in Tianjin. The conclusions achieved from this study are as follows: (1) IHR increased water supply assurance rates for domestic water with high-priority and avoided destructive water shortages in agricultural water with low-priority. (2) IHR can better reduce the destructive loss caused by a large number of water shortages and the loss of production caused by a small numbers of water shortages than traditional hedging rules, which ensures high efficiency of water supply during the dry period. The results show that the IHR can improve the operational performance of the urban water supply.

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Operating Rule Curves for Multiple Reservoir System : A Case Study in Mae Klong River Basin, Thailand

Journal of Rainwater Catchment Systems ◽

10.7132/jrcsa.kj00000795233 ◽

2004 ◽

Vol 9 (2) ◽

pp. 11-19 ◽

Cited By ~ 4

Author(s):

Janejira Tospornsampan ◽

Ichiro Kita ◽

Masayuki Ishii ◽

Yoshinobu Kitamura

Keyword(s):

River Basin ◽

Rule Curves ◽

Reservoir System ◽

System A ◽

Multiple Reservoir ◽

Operating Rule ◽

Operating Rule Curves

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A Case Study in View of Developing Predictive Models for Water Supply System Management

Energies ◽

10.3390/en14113305 ◽

2021 ◽

Vol 14 (11) ◽

pp. 3305

Author(s):

Katarzyna Pietrucha-Urbanik ◽

Barbara Tchórzewska-Cieślak ◽

Mohamed Eid

Keyword(s):

Water Supply ◽

Predictive Models ◽

Failure Modes ◽

Supply System ◽

Water Supply System ◽

System Management ◽

System A ◽

Operational Failure ◽

Operational Data

Initiated by a case study to assess the effectiveness of the modernisation actions undertaken in a water supply system, some R&D activities were conducted to construct a global predictive model, based on the available operational failure and recovery data. The available operational data, regarding the water supply system, are the pipes’ diameter, failure modes, materials, functional conditions, seasonality, and the number of failures and time-to-recover intervals. The operational data are provided by the water company responsible of the supply system. A predictive global model is proposed based on the output of the operational data statistical assessment. It should assess the expected effectiveness of decisions taken in support of the modernisation and the extension plan.

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Towards an optimal integrated reservoir system management for the Awash River Basin, Ethiopia

Proceedings of the International Association of Hydrological Sciences ◽

10.5194/piahs-373-215-2016 ◽

2016 ◽

Vol 373 ◽

pp. 215-219 ◽

Cited By ~ 1

Author(s):

Ruben Müller ◽

Henok Y. Gebretsadik ◽

Niels Schütze

Keyword(s):

Water Supply ◽

River Basin ◽

Socioeconomic Development ◽

System Management ◽

Hydro Power ◽

Rule Curves ◽

Reservoir System ◽

Irrigation Projects ◽

Awash River Basin ◽

Performance Penalty

Abstract. Recently, the Kessem–Tendaho project is completed to bring about socioeconomic development and growth in the Awash River Basin, Ethiopia. To support reservoir Koka, two new reservoirs where built together with extensive infrastructure for new irrigation projects. For best possible socioeconomic benefits under conflicting management goals, like energy production at three hydropower stations and basin wide water supply at various sites, an integrated reservoir system management is required. To satisfy the multi-purpose nature of the reservoir system, multi-objective parameterization-simulation-optimization model is applied. Different Pareto-optimal trade-off solutions between water supply and hydro-power generation are provided for two scenarios (i) recent conditions and (ii) future planned increases for Tendaho and Upper Awash Irrigation projects. Reservoir performance is further assessed under (i) rule curves with a high degree of freedom – this allows for best performance, but may result in rules curves to variable for real word operation and (ii) smooth rule curves, obtained by artificial neuronal networks. The results show no performance penalty for smooth rule curves under future conditions but a notable penalty under recent conditions.

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