scholarly journals Optimal operation of a multi-reservoir system for environmental water demand of a river-connected lake

2016 ◽  
Vol 47 (S1) ◽  
pp. 206-224 ◽  
Author(s):  
Jingqiao Mao ◽  
Peipei Zhang ◽  
Lingquan Dai ◽  
Huichao Dai ◽  
Tengfei Hu
Keyword(s):  
Normal Condition ◽  
Water Demand ◽  
Yangtze River ◽  
Environmental Water ◽  
Optimal Operation ◽  
Dongting Lake ◽  
Support Vector ◽  
Reservoir Operations ◽  
Reservoir System ◽  
Environmental Water Demand

Dongting Lake, a large river-connected lake in the Yangtze River watershed, plays important roles in flood control, drought mitigation, and biodiversity conservation. Its ecosystem has recently been severely affected by upstream water resource development such as reservoir operations. In this study, an optimization model is developed for the operation of a multi-reservoir system, including the Three Gorges Reservoir (TGR) on the upper Yangtze River and 8 major reservoirs on the tributaries to Dongting Lake. The optimal target in pursuit of the ecological objective is to maximize the environmental water demand (EWD) satisfaction of the lake. A support vector regression-based model is used to predict the response of the lake level to reservoir operations. The optimization is carried out under different scenarios for both normal and dry conditions, and the results show that: (i) the existing operation policy could result in significant hydrologic alteration; (ii) in the normal condition, the proposed optimal joint operation policy could increase the general EWD satisfaction rate of Dongting Lake from 85.4% to 95.7%; and (iii) the improvement of EWD satisfaction in the normal condition is mainly affected by the TGR, while in the dry condition, the southern and western lake regions are more sensitive to the tributaries' reservoirs.

scholarly journals Multi-Objective Joint Optimal Operation of Reservoir System and Analysis of Objectives Competition Mechanism: A Case Study in the Upper Reach of the Yangtze River

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2542 ◽  
Author(s):  
Mufeng Chen ◽  
Zengchuan Dong ◽  
Wenhao Jia ◽  
Xiaokuan Ni ◽  
Hongyi Yao
Keyword(s):  
Power Generation ◽  
Water Supply ◽  
Yangtze River ◽  
Water Resource Management ◽  
Flood Control ◽  
Optimal Operation ◽  
Total Power ◽  
The Yangtze River ◽  
Multi Objective ◽  
Reservoir System

The multi-objective optimal operation and the joint scheduling of giant-scale reservoir systems are of great significance for water resource management; the interactions and mechanisms between the objectives are the key points. Taking the reservoir system composed of 30 reservoirs in the upper reaches of the Yangtze River as the research object, this paper constructs a multi-objective optimal operation model integrating four objectives of power generation, ecology, water supply, and shipping under the constraints of flood control to analyze the inside interaction mechanisms among the objectives. The results are as follows. (1) Compared with single power generation optimization, multi-objective optimization improves the benefits of the system. The total power generation is reduced by only 4.09% at most, but the water supply, ecology, and shipping targets are increased by 98.52%, 35.09%, and 100% at most under different inflow conditions, respectively. (2) The competition between power generation and the other targets is the most obvious; the relationship between water supply and ecology depends on the magnitude of flow required by the control section for both targets, and the restriction effect of the shipping target is limited. (3) Joint operation has greatly increased the overall benefits. Compared with the separate operation of each basin, the benefits of power generation, water supply, ecology, and shipping increased by 5.50%, 45.99%, 98.49%, and 100.00% respectively in the equilibrium scheme. This study provides a widely used method to analyze the multi-objective relationship mechanism, and can be used to guide the actual scheduling rules.

Ecological water demand in the typical polder of Dongting Lake

2020 ◽  
Author(s):  
Yi Cai ◽  
Lihua Tang ◽  
Dazuo Tian ◽  
Xiaoyi Xu
Keyword(s):  
Water Demand ◽  
Human Activities ◽  
Yangtze River ◽  
Human Impacts ◽  
Dongting Lake ◽  
The Yangtze River ◽  
Ecological Water Demand ◽  
Lake Region ◽  
The Relationship ◽  
Water Ecology

<p>Dongting Lake is the largest lake in the middle reaches of the Yangtze River in China. After the completion of the Three Gorges Project, the relationship between the Yangtze River and Dongting Lake has a significant change with the decreased diversion ratio. Besides, due to the overexploitation of local human activities, some dry-up reaches appeared in the Dongting Lake region, especially in the polders with high strength  human activities. In order to scientifically understand the evolution law of water resources in those protective embankments in lakeside areas, and understand the relationship between human activities and ecosystem stability, the study works on the ecological water demand that coupled with the ecological capacity of the environment. As a typical polder, the Yule polder is selected as a case study in the Dongting Lake region. The objective is to obtain the ecological water demand process which can maintain the requirements of water quantity and quality of water to maintain water ecological needs under the condition of significant human impacts. Based on the actual situation of vegetation coverage, aquatic organism growth status and protection goals, and water demand of the industrial and agricultural population, taking the satisfaction degree of ecological water demand as an indicator, healthy of local water ecology is to be evaluated. Combining the hydrological situation of entire Yangtze River basin, the temporal distribution characteristics of ecological water demand in the Yule polder is analyzed, and also the feasibility of measures such as diverting Yangtze River water to alleviate the fragility of water ecology in the Dongting Lake region is discussed. These results could provide experience for solving similar problems in other regions.</p>

Environmental water demand assessment under climate change conditions

2017 ◽  
Vol 189 (7) ◽  
Author(s):  
Parisa Sarzaeim ◽  
Omid Bozorg-Haddad ◽  
Elahe Fallah-Mehdipour ◽  
Hugo A. Loáiciga
Keyword(s):  
Climate Change ◽  
Water Demand ◽  
Environmental Water ◽  
Demand Assessment ◽  
Environmental Water Demand

Study on the theory and method of urban eco-environmental water demand and distribution

2020 ◽  
Vol 180 ◽  
pp. 211-218
Author(s):  
Xiu-yu Zhang ◽  
Xue-fang Du ◽  
Si Chen ◽  
Tian Qin
Keyword(s):  
Water Demand ◽  
Environmental Water ◽  
Environmental Water Demand

Quantitative Study on Eco-Environmental Water Demand of Urban Water System

2013 ◽  
Vol 671-674 ◽  
pp. 2575-2579 ◽  
Author(s):  
Wen Jie Xu ◽  
Wei Guo Chen ◽  
Xiao Ping Zhang ◽  
Hui Ling Gong
Keyword(s):  
Quantitative Study ◽  
Water Demand ◽  
Water System ◽  
Environmental Water ◽  
Shandong Province ◽  
Urban Water ◽  
Normal Functions ◽  
Urban Water System ◽  
Sustainable Usage ◽  
Environmental Water Demand

Eco-environmental water demand of urban water system should be that of certain quality, which is necessary for it to develop its normal functions. The water system includes Dongchang Lake, Tuhai River and Old Canal in Liaocheng City, Shandong Province, China. The multiannual mean optimum, medium and minimum eco-environmental water demand of Dongchang Lake are respectively 2922.9×104m3, 2334.7×104m3 and 1746.4×104m3. Those of Tuhai River are respectively 4757.9×104m3, 2865.7×104m3 and 1919.7×104m3. Those of Old Canal are respectively 348.0×104m3, 277.9×104m3 and 207.9×104m3. Then those of the water system in Liaocheng City are respectively 8028.8×104m3, 5478.3×104m3 and 3874×104m3. These results can provide basis for protecting its eco-environment and promoting its sustainable usage.

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