Assessment of Water Supply Stability for Drought-Vulnerable Boryeong Multipurpose Dam in South Korea Using Future Dry Climate Change Scenarios

Kim, Won-Jin; Lee, Jiwan; Kim, Jinuk; Kim, Seong-Joon

doi:10.3390/w11112403

Cited by 11 publications

(4 citation statements)

References 31 publications

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“…In South Korea, reservoir operation for mitigating CyanoHABs has primarily focused on flow control flushing water from a reservoir to a river downstream [22,23]. However, the use of water in reservoirs for improving water quality has not been generally factored into the design of reservoirs in South Korea [24][25][26]. Hence, the flow control using an additional amount of water has been only temporarily taken in order to mitigate CyanoHABs [22], since this flow control can cause water shortage.…”

Section: Introductionmentioning

confidence: 99%

Decision Support Framework for Optimal Reservoir Operation to Mitigate Cyanobacterial Blooms in Rivers

Kim,

Jonoski,

Solomatine

et al. 2023

Sustainability

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Flow control flushing water from reservoirs has been imposed in South Korea for mitigating harmful cyanobacterial blooms (CyanoHABs) in rivers. This measure, however, can cause water shortage in reservoirs, as the measure adopting this flow control may require an additional amount of water which exceeds the water demand allocated to the reservoirs. In terms of sustainability, a trade-off between improving water quality and alleviating water shortage needs to be considered. This study aimed at establishing a practical framework for a decision support system for optimal joint operation of the upstream reservoirs (Andong and Imha) to reduce the frequency of CyanoHABs in the Nakdong River, South Korea. Methodologically, three models were introduced: (1) a machine learning model (accuracy 88%) based on the k-NN (k-Nearest Neighbor) algorithm to predict the occurrence of CyanoHABs at a selected downstream location (the Chilgok Weir located approximately 140 km downstream from the Andong Dam), (2) a multiobjective optimization model employing NSGA-II (Nondominated Sorting Genetic Algorithm II) to determine both the quantity and quality of water released from the reservoirs, and (3) a river water quality model (R2 0.79) using HEC-RAS to simulate the water quality parameter at Chilgok Weir according to given upstream boundary conditions. The applicability of the framework was demonstrated by simulation results using observational data from 2015 to 2019. The simulation results based on the framework confirmed that the frequency of CyanoHABs would be decreased compared with the number of days when CyanoHABs were observed at Chilgok Weir. This framework, with a combination of several models, is a novelty in terms of efficiency, and it can be a part of a solution to the problem of CyanoHABs without using an additional amount of water from a reservoir.

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Section: Introductionmentioning

confidence: 99%

Decision Support Framework for Optimal Reservoir Operation to Mitigate Cyanobacterial Blooms in Rivers

Kim,

Jonoski,

Solomatine

et al. 2023

Sustainability

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“…Water management is affected by climate change, as water stress is predicted to increase in central and southern Europe, and competition for water distribution and use in North America has been intensifying [1]. In South Korea, water resources are expected to vary with climate change in reservoir watersheds [2][3][4][5][6]. In Japan, for the Yagisawa Reservoir in the Tone River Basin, the need for release control has been suggested in accordance with the reduced inflow owing to climate change [7].…”

Section: Introductionmentioning

confidence: 99%

Agricultural Reservoir Operation Strategy Considering Climate and Policy Changes

Lee

Shin

2022

Sustainability

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Agricultural water is affected by climate change and water management. Agricultural reservoirs are increasing demand on the environmental water supply because the Korean government has recently implemented an integrated water resource management policy. However, agricultural reservoirs are still in operation solely to supply agricultural water. To examine sustainable agricultural water management under climate change, we analyzed the strategy of operating regulations to efficiently distribute agricultural water as environmental water. We simulated the agricultural reservoir operation, analyzing its water supply capacity by applying operation regulations. The simulation predicted that future water supply capacity would decrease if the existing operation were maintained, and agricultural reservoir operation will be necessary in the future. The proposed reservoir operating strategy decreased the maximum water shortage and number of water shortage days compared with the existing operation with the required water supply. Our results can contribute to agricultural reservoir operation strategies and sustainable water management in response to climate change and provide decision-making guidance on water distribution for environmental use in response to water management policy changes.

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“…Rainfall and runoff discrepancies have exacerbated the agricultural drought vulnerability of Korea, compromising the water supply reliability (WSR) of reservoirs [10]. Severe droughts struck Korea every 6-7 years during the 20th century; however, after 2000, there have been consecutive droughts during 2013-2018 [12]. The decline in monsoon rainfall in the rice season is the main cause of drought, and has resulted in restricted runoff gen-2 of 16 eration in the watershed, and the inability of agricultural reservoirs to meet irrigation demands [4,13].…”

Section: Introductionmentioning

confidence: 99%

Water Supply Reliability of Agricultural Reservoirs under Varying Climate and Rice Farming Practices

Cho

Ahmad

Choi

2021

Water

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Technological development and climate change dictate farming practices, which can directly affect irrigation water requirement and supply. In this article, the water supply reliability (WSR) of 62 major Korean agricultural reservoirs was comprehensively evaluated for varying climate and farming practices. Field surveys identified the recent divergence from standard rice farming practices and a 45-year daily weather data set (1973–2017) was examined to understand the phenomenon of climate change. Effective rainfall increments mitigated the imminent surges in rice irrigation water requirements driven by warming-led accelerated crop evapotranspiration rates; therefore, climate change marginally influenced the WSR of selected reservoirs. The transplanting period and associated water consumption were the primary deviations from standard rice farming practices. A significantly prolonged transplanting period seriously compromised the WSR of agricultural reservoirs and the maximum number of unsafe reservoirs was detected for a 24-day increase in the transplanting period. A watershed/irrigated area ratio of less than 2.5 was the lower threshold below which all the reservoirs had unsafe WSR regardless of the climate change and/or farming practices. Recent variations in farming practices were the primary cause of reservoir failure in maintaining the WSR.

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Assessment of Water Supply Stability for Drought-Vulnerable Boryeong Multipurpose Dam in South Korea Using Future Dry Climate Change Scenarios

Cited by 11 publications

References 31 publications

Decision Support Framework for Optimal Reservoir Operation to Mitigate Cyanobacterial Blooms in Rivers

Decision Support Framework for Optimal Reservoir Operation to Mitigate Cyanobacterial Blooms in Rivers

Agricultural Reservoir Operation Strategy Considering Climate and Policy Changes

Water Supply Reliability of Agricultural Reservoirs under Varying Climate and Rice Farming Practices

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