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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Optimal operation of a multi-reservoir system for environmental water demand of a river-connected la...
Optimal operation of a multi-reservoir system for environmental water demand of a river-connected lake
Author : JINGQIAO MAO (1), PEIPEI ZHANG (1), LINGQUAN DAI (1) & HUICHAO DAI (1)
ABSTRACT
River-connected lakes play important roles in flood control, drought mitigation, water quality maintenance, and
biodiversity conservation of watersheds. However, their ecosystems¡¯ functioning and stability might be sensitive to the
altered flow regimes due to dam construction and flow regulation. Dongting Lake of China is a large shallow lake directly
connected to Yangtze River in the middle region, of which its ecosystem functions have been threatened and disturbed
by the upstream water resource development. In the study, an optimization model that considers both the basic human
needs and environmental water demand (EWD) of Dongting Lake is developed for the operations of a multi-reservoir
system. The system covers the world¡¯s largest water resource project (Three Gorges Reservoir built on the upper
Yangtze River) and two large reservoirs situated on the tributaries of Dongting Lake. The optimal target in pursuit of the
ecological objective is to maximize the EWD satisfaction of Dongting Lake, which has been estimated from the analysis
of long-term hydrological data. We use a support vector machine-based model to examine the response of lacustrine
hydrological conditions to reservoir operation and inflow of other tributaries. The optimization is carried out for different
scenarios, and the results show that: (i) the existing operation policy have been resulted in significant hydrologic
alteration in the natural flow regime; (ii) an optimal joint operation policy proposed in the study could increase the
general EWD satisfaction rate of Dongting Lake from 89.4% to 96.9%; (iii) the overall degree of lake¡¯s EWD satisfaction
is mainly affected by the operation of Three Gorges Reservoir.
File Size : 804,088 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 19/08/2015
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