Daily flow simulation in Thailand Part II: Unraveling effects of reservoir operation
Study region: Upper region of the Greater Chao Phraya River (GCPR) basin in Thailand. Study focus: The upper GCPR basin is highly regulated by multipurpose reservoirs, which obviously have altered the natural streamflow. Understanding quantitative effects of such alteration is crucial for effective...
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doaj-d0c519c2a259404f8168d8a5f20cb8172021-03-27T04:27:37ZengElsevierJournal of Hydrology: Regional Studies2214-58182021-04-0134100792Daily flow simulation in Thailand Part II: Unraveling effects of reservoir operationC. Wannasin0C.C. Brauer1R. Uijlenhoet2W.J. van Verseveld3A.H. Weerts4Hydrology and Quantitative Water Management Group, Wageningen University and Research, P.O. Box 47, 6700AA Wageningen, The Netherlands; Corresponding author.Hydrology and Quantitative Water Management Group, Wageningen University and Research, P.O. Box 47, 6700AA Wageningen, The NetherlandsHydrology and Quantitative Water Management Group, Wageningen University and Research, P.O. Box 47, 6700AA Wageningen, The Netherlands; Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, P.O. Box 5048, 2600GA Delft, The NetherlandsCatchment and Urban Hydrology, Department of Inland Water Systems, Deltares, P.O. Box 177, 2600MH Delft, The NetherlandsHydrology and Quantitative Water Management Group, Wageningen University and Research, P.O. Box 47, 6700AA Wageningen, The Netherlands; Operational Water Management, Department of Inland Water Systems, Deltares, P.O. Box 177, 2600MH Delft, The NetherlandsStudy region: Upper region of the Greater Chao Phraya River (GCPR) basin in Thailand. Study focus: The upper GCPR basin is highly regulated by multipurpose reservoirs, which obviously have altered the natural streamflow. Understanding quantitative effects of such alteration is crucial for effective water resource management. Therefore, this study aims to assess how reservoir operation affects the water balance, daily flow regime and extreme flows in this basin. For this purpose, we reconstructed streamflow in the naturalized (no reservoir) and baseline operation scenarios using the (∼1 km resolution) distributed model. To overcome data scarcity, we ran the model with global data and parameterization. A target storage-and-release-based reservoir operation module was applied in the baseline operation scenario. The model results were analyzed in comparison to observations in a wet year, a dry year, and the period 1989–2014. New hydrological insights for the region: The reservoir operation resulted in more evaporation. It inverted the natural flow seasonality and smoothed the daily flow regime with decreasing high flows, increasing mean flows and low flows, greater baseflow contribution, and lower flashiness. It prevented or mitigated many historical extreme flow incidents. The annual flood peaks and minimum flows were markedly mitigated in terms of both magnitudes and frequencies, but their timing became more variable and difficult to predict. Altogether, the results highlighted the importance of effective decision making for real-time operation, which remain challenging in practice.http://www.sciencedirect.com/science/article/pii/S2214581821000215Reservoir effectsNaturalized flowScenario analysisDistributed hydrological modelWflow_sbmChao Phraya basin |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
C. Wannasin C.C. Brauer R. Uijlenhoet W.J. van Verseveld A.H. Weerts |
spellingShingle |
C. Wannasin C.C. Brauer R. Uijlenhoet W.J. van Verseveld A.H. Weerts Daily flow simulation in Thailand Part II: Unraveling effects of reservoir operation Journal of Hydrology: Regional Studies Reservoir effects Naturalized flow Scenario analysis Distributed hydrological model Wflow_sbm Chao Phraya basin |
author_facet |
C. Wannasin C.C. Brauer R. Uijlenhoet W.J. van Verseveld A.H. Weerts |
author_sort |
C. Wannasin |
title |
Daily flow simulation in Thailand Part II: Unraveling effects of reservoir operation |
title_short |
Daily flow simulation in Thailand Part II: Unraveling effects of reservoir operation |
title_full |
Daily flow simulation in Thailand Part II: Unraveling effects of reservoir operation |
title_fullStr |
Daily flow simulation in Thailand Part II: Unraveling effects of reservoir operation |
title_full_unstemmed |
Daily flow simulation in Thailand Part II: Unraveling effects of reservoir operation |
title_sort |
daily flow simulation in thailand part ii: unraveling effects of reservoir operation |
publisher |
Elsevier |
series |
Journal of Hydrology: Regional Studies |
issn |
2214-5818 |
publishDate |
2021-04-01 |
description |
Study region: Upper region of the Greater Chao Phraya River (GCPR) basin in Thailand. Study focus: The upper GCPR basin is highly regulated by multipurpose reservoirs, which obviously have altered the natural streamflow. Understanding quantitative effects of such alteration is crucial for effective water resource management. Therefore, this study aims to assess how reservoir operation affects the water balance, daily flow regime and extreme flows in this basin. For this purpose, we reconstructed streamflow in the naturalized (no reservoir) and baseline operation scenarios using the (∼1 km resolution) distributed model. To overcome data scarcity, we ran the model with global data and parameterization. A target storage-and-release-based reservoir operation module was applied in the baseline operation scenario. The model results were analyzed in comparison to observations in a wet year, a dry year, and the period 1989–2014. New hydrological insights for the region: The reservoir operation resulted in more evaporation. It inverted the natural flow seasonality and smoothed the daily flow regime with decreasing high flows, increasing mean flows and low flows, greater baseflow contribution, and lower flashiness. It prevented or mitigated many historical extreme flow incidents. The annual flood peaks and minimum flows were markedly mitigated in terms of both magnitudes and frequencies, but their timing became more variable and difficult to predict. Altogether, the results highlighted the importance of effective decision making for real-time operation, which remain challenging in practice. |
topic |
Reservoir effects Naturalized flow Scenario analysis Distributed hydrological model Wflow_sbm Chao Phraya basin |
url |
http://www.sciencedirect.com/science/article/pii/S2214581821000215 |
work_keys_str_mv |
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