Minimizing the impact of vacating instream storage of a multi-reservoir system: a trade-off study of water supply and empty flushing
<p>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 flush...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2021-04-01
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| Series: | Hydrology and Earth System Sciences |
| Online Access: | https://hess.copernicus.org/articles/25/2063/2021/hess-25-2063-2021.pdf |
| Summary: | <p>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.</p> |
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| ISSN: | 1027-5606 1607-7938 |