Evaluation of optimal water flow and temperature in response to outdoor air temperature in plastic greenhouse with recirculated water curtain system

Kim, Hyung-Kweon; yun-shik, Kim; Jeon, Jonggil; Paek, Yee; Lee, Jae-Han; Khoshimkhujaev, Bekhzod; Kim, Yong-Cheol

doi:10.1007/s12206-017-0548-8

Cited by 7 publications

(6 citation statements)

References 7 publications

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“…The need for cooling and heating in greenhouses is steadily increasing; however, greenhouse cultivation involves high energy consumption [2][3][4][5][6]. In South Korea, the cost of heating greenhouses is a burden because it accounts for 30-40% of the cost of managing greenhouse horticulture [7][8][9]. However, the cooling load is known to consume much more energy than heating; thus, greenhouse crop cultivation is generally not performed during the hot season (July to August) in South Korea [10].…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Effect of Cover Materials on Greenhouse Microclimates and Thermal Performance

et al. 2022

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This study compared and analyzed changes in the microclimate and thermal environment inside single-span greenhouses covered with a single layer of plastic film, polycarbonate (PC), and glass. The results of the experiment show that the PC-covered greenhouse was the most favorable for managing the nighttime heating effect during the cold season. However, the glass-covered greenhouse was found to be the most favorable for managing the cooling effect during the hot season. Although the plastic-covered greenhouse was inexpensive and easy to install, the air temperature inside varied significantly, and it was difficult to control its indoor environment. The thermal load leveling values showed that the PC-covered greenhouse had the lowest variation, confirming its superiority in terms of environmental control and energy savings. In terms of the overall heat transfer, heat was generally transferred from the interior to the exterior of the greenhouses. In the plastic-covered greenhouse, however, heat was transferred in the opposite direction at night due to the influence of radiant cooling. The occurrence of the minimum and maximum heat transfer values had a tendency similar to that of the occurrence of the minimum and maximum air temperatures inside the greenhouses.

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Section: Introductionmentioning

confidence: 99%

Evaluating the Effect of Cover Materials on Greenhouse Microclimates and Thermal Performance

et al. 2022

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“…The agricultural region around Buyeo City, within the Geum River Basin, is one of largest agricultural producers in South Korea. Farmers in this region grow watermelon, melon, strawberries, cucumber, and pumpkin in greenhouses using groundwater irrigation (H. Kim et al., 2017). To maintain warmth during the winter, farmers employ the water curtain cultivation technique, installing greenhouses within greenhouses.…”

Section: Study Areamentioning

confidence: 99%

Groundwater Level Forecasting Using Machine Learning: A Case Study of the Baekje Weir in Four Major Rivers Project, South Korea

Yi,

Kondolf,

Sandoval Solis

et al. 2024

Water Resources Research

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Understanding the impact of human‐made structures on groundwater levels is essential, with structures like dams or weirs presenting unique challenges and opportunities for study. The Baekje weir in South Korea presents an interesting case as the weir has undergone full gate opening, which is generally not the case for weirs and reservoirs, providing valuable opportunity for simulating weir removal conditions. The main objectives are investigation of groundwater level fluctuations under various weir operations, distances from the weir, and seasonal variations. The study utilizes observed data that simulates conditions with and without the weir, including scenarios of full gate opening. Multiple machine learning algorithms—Random Forest (RF), Artificial Neural Network, Support Vector Regression (SVR), Gradient Boosting, and Extreme Gradient Boosting (XGBoost)—are used to develop accurate groundwater level prediction models. The models' performance is assessed using coefficient of determination, Root mean square error (RMSE), Mean Absolute Error (MAE) indices, and visualized through Taylor diagrams. Results indicate that XGBoost outperforms other models in all three groups during both training and testing phases. Specifically, XGBoost surpasses RF by 2.09% (R2), 5.66% (RMSE), and 10.1% (MAE) in training, and outperforms SVR by 11.2% (R2), 42.0% (RMSE), and 129.2% (MAE) in testing. Additionally, the study generates groundwater level maps, providing a practical tool for managing groundwater systems and informing decision‐making in weir operations. This study not only sheds light on the dynamic relationship between weir operations and groundwater levels but also provides actionable insights for effective water management in similar hydrological settings.

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“…At this time, the specific capacity of 234 groundwater pumping wells was reduced by >20% (Table 4). Based on both PAT and API indexes, groundwater pumping rates in most of the study area decreased, which is expected to significantly reduce the thermal benefit applied to water-curtain greenhouses by groundwater pumping [39,40]. Water supply alternatives are needed if weirs are to be operated efficiently in areas concerned with difficult groundwater use.…”

Section: Effects Of Opening Of the Weir On Seasonal Groundwater Usementioning

confidence: 99%

Effects of Weir Operation on Seasonal Groundwater Use: A Case Study of the Han River, South Korea

Lee

Kim

et al. 2022

Water

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During the cold dry season, a large amount of groundwater is pumped for water-curtain cultivation in agricultural fields mostly located near the four major rivers of South Korea. Several weirs, installed previously to secure sufficient water resources from these rivers, were opened in 2017 for restoring the riverine environment. Weir-controlled river level fluctuations have altered stream–aquifer interactions, leading to groundwater drawdown. In this study, changes in stream–aquifer interaction caused by seasonal pumping and weir opening were investigated, using Visual MODFLOW. Two indexes that considered the pump type and aquifer characteristics—the pumping available thickness (PAT) and aquifer productivity index (API)—were used to analyze the effects of weir opening on seasonal groundwater use. Our simulations indicated that weir opening had a large impact on seasonal groundwater use due to groundwater drawdown, especially with respect to centrifugal pumps located in low transmissivity areas where the API decreased after the weir was opened. The resulting decrease in groundwater pumping rates would lower the thermal effect of the water-curtain greenhouse process. This indicates that water supply alternatives are needed so that the weirs can be operated efficiently and field requirements can be met, while the deleterious effects on groundwater are avoided.

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Evaluation of optimal water flow and temperature in response to outdoor air temperature in plastic greenhouse with recirculated water curtain system

Cited by 7 publications

References 7 publications

Evaluating the Effect of Cover Materials on Greenhouse Microclimates and Thermal Performance

Evaluating the Effect of Cover Materials on Greenhouse Microclimates and Thermal Performance

Groundwater Level Forecasting Using Machine Learning: A Case Study of the Baekje Weir in Four Major Rivers Project, South Korea

Effects of Weir Operation on Seasonal Groundwater Use: A Case Study of the Han River, South Korea

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