Article
Water Resources
Abdullah Azzam, Wanchang Zhang, Chi Xu, Zakria Khan
Summary: This study proposes a modified Hargreaves-Samani (HS) equation based on actual vapor pressure and linear regression to estimate the daily reference evapotranspiration (ETo) in the Amu Darya River Basin (ADRB), Central Asia. The modified HS equation and empirical coefficient using newly-proposed variable significantly reduce the average root mean square error and mean absolute error by about 55% and 52%, respectively, compared to other proposed methods, demonstrating their feasibility and accuracy in the ADRB. Additionally, the modified HS equation based on climatic zones was found to be more accurate and comprehensive than geographical localizations. This approach is suitable for estimating ETo in data scarce regions (e.g., ADRB) when only temperature, solar radiation, and vapor pressure data are available.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2023)
Article
Chemistry, Multidisciplinary
Yan Liu, Sha Zhang, Jiahua Zhang, Lili Tang, Yun Bai
Summary: Accurate estimation of evapotranspiration is important for water management and agricultural development. This study trained two models for estimating cropland ET, with ANN-PM showing better performance than Medlyn-PM. The ANN-PM method can reasonably estimate the ET of croplands under different environmental conditions, especially in dry climates.
APPLIED SCIENCES-BASEL
(2021)
Article
Green & Sustainable Science & Technology
Soo-Jin Kim, Seung-Jong Bae, Min-Won Jang
Summary: A linear regression machine learning model based on temperature data was developed to estimate reference evapotranspiration in South Korea. Compared to temperature-based empirical equations, the proposed model achieved higher accuracy and lower error when using all meteorological data.
Article
Environmental Sciences
Fernando Onate-Valdivieso, Arianna Onate-Paladines, Deiber Nunez
Summary: This study analyzed the capabilities of four satellite sensors with different spatial and temporal resolutions (LANDSAT 8, ASTER, MODIS and SENTINEL 3) in calculating the reference crop evapotranspiration (ETo) using images and products obtained. The FAO Penman-Monteith equation was used in both traditional and remote sensing approaches to estimate ETo values. The accuracy of the satellite products was evaluated through cross-validation, comparing them with values obtained from meteorological stations. The study found that spatial resolution had a direct correlation with the accuracy of ETo estimates, with LANDSAT 8 products being the most accurate. However, SENTINEL 3 was preferred for continuous ETo monitoring.
Article
Water Resources
Shigeki Murakami
Summary: Canopy interception can be divided into three processes: evaporation during rainfall, during storm break time and after cessation of rainfall. It was found that evaporation during rainfall was much larger than during storm break time. The study also showed that the measured evaporation during rainfall was greater than the calculated values using the Penman-Monteith equation.
HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES
(2021)
Article
Environmental Sciences
Cheng- Hsieh, I-Hang Huang, Chun-Te Lu
Summary: This study compared the accuracy of the support vector machine algorithm and an analytical solution for estimating canopy resistance, and applied these methods to calculate evapotranspiration. The results showed that the support vector machine model performed better, while the analytical solution was only suitable for low canopy resistance conditions.
Article
Environmental Sciences
Fatemeh Ghafarian, Ralf Wieland, Claas Nendel
Summary: This study investigates the potential of evaporative cooling using soybean as an example. The results show that the cooling effects caused by evapotranspiration within and above the canopy were, on average, 4.4 K and 2.9 K, respectively. The model performs better above the canopy than below.
Article
Water Resources
Lei Zhang, Jiaqi Zhang, Seydou Traore, Jiankun Ge, Xin Zhao, Hongbin Zhan, Vijay P. Singh
Summary: This study focuses on the continental-scale spatiotemporal calibration of the Bla-ney-Criddle equation (BC) for different climate zones in China. The results show that the quarterly calibrated BC model performs well in the temperate monsoon and temperate continental climate zones, providing an accurate model for calculating ET0 in different climate types in China.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2022)
Article
Agronomy
Haofang Yan, Jianjun Yu, Chuan Zhang, Guoqing Wang, Song Huang, Jiamin Ma
Summary: A comparative study was conducted to evaluate the performances of the KP and TD models in simulating the actual evapotranspiration for tea and wheat fields, showing that the KP model performed well for both crops while the TD model overestimated evapotranspiration for tea by 44.9%. The study suggested that the KP model is preferred for estimating evapotranspiration for both crops, with the TD model should be avoided in tea fields.
AGRICULTURAL WATER MANAGEMENT
(2021)
Article
Environmental Sciences
Yan Liu, Sha Zhang, Jiahua Zhang, Lili Tang, Yun Bai
Summary: Accurate estimates of evapotranspiration (ET) over croplands on a regional scale contribute to agricultural management. Hybrid ET models combining the physical framework of the Penman-Monteith equation and various machine learning (ML) algorithms have shown effectiveness. Among the different ML algorithms, the artificial neural network (ANN) based model exhibited optimal performance in daily ET estimation, with lower RMSE and higher correlation coefficients compared to other algorithms.
Article
Engineering, Civil
Xiaonan Guo, Yanfang Wang, Haiming Yan, Peng Liu, Yun Tian, Guofei Shang, Chuan Jin, Tianshan Zha
Summary: Dew and hoar frost are important water sources in dryland ecosystems, but their characteristics on shrub canopies and surfaces are not well understood. This study examined the frequency, duration, and amount of dew/hoar frost on two common species in northern China. Results showed diurnal and seasonal variations in dew/hoar frost duration, with dew being a significant water supply during periods of drought.
JOURNAL OF HYDROLOGY
(2022)
Article
Agronomy
Ho-Jun Kim, Sewwandhi Chandrasekara, Hyun-Han Kwon, Carlos Lima, Tae-woong Kim
Summary: The main focus of this study is to develop a multi-scale surrogate model for estimating evapotranspiration (ETo) using only temperature as input. A Bayesian approach is adopted to estimate the parameters of the Hargreaves-Samani equation, which can vary across space. The proposed model provides more accurate estimations of ETo at daily, monthly, and annual scales compared to the traditional model.
AGRICULTURAL WATER MANAGEMENT
(2023)
Article
Green & Sustainable Science & Technology
Zhigong Peng, He Chen, Zheng Wei, Baozhong Zhang, Suyang Zhang, Liqin Gong, Guiyu Yang, Jiabing Cai, Wangcheng Li, Qian Zhang
Summary: This study aims to investigate the influence of recommended coefficient values on solar radiation and reference crop evapotranspiration in China. The results show that the distribution characteristics of the errors caused by the recommended values are inconsistent at the annual and monthly scales, and they have significant impacts on daily solar radiation throughout the year and evapotranspiration during the critical crop growth period. Therefore, the suitability of the recommended values needs to be carefully scrutinized.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Meteorology & Atmospheric Sciences
Mohamed Tarek Sobh, Mohamed Salem Nashwan, Nabil Amer
Summary: Accurate estimation of evapotranspiration is crucial in arid regions like Egypt. This study compares and evaluates the performance of various empirical equations and artificial intelligence models in estimating reference evapotranspiration. The results show that equations based on radiation and the random forest model outperform others in replicating the reference estimates.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2022)
Article
Environmental Sciences
Cheng- Hsieh, Cheng-Jiun Chiu, I-Hang Huang, Gerard Kiely
Summary: This study investigated the performance of the non-parametric method in estimating evapotranspiration, finding that it was successful for grassland and peat bog but performed poorly in forest areas. Penman-Monteith and Priestley-Taylor equations were able to predict water vapor and sensible heat fluxes well when canopy resistance and the P-T constant of the ecosystem were given a priori.
Article
Plant Sciences
Jun Hyeun Kang, Hyo In Yoon, Jae Moon Lee, Jae Pil Kim, Jung Eek Son
Summary: The study showed that a green-to-red spectrum conversion film did not alter leaf optical properties and chlorophyll content but significantly increased chlorophyll fluorescence parameters related to reduction end electron acceptors and electron transport efficiency.
PHOTOSYNTHESIS RESEARCH
(2022)
Article
Horticulture
Tae In Ahn, Jung-Seok Yang, Soo Hyun Park, Ju Young Lee
Summary: The study found that different treatment schemes for tomato gutter lines have significant impacts on evapotranspiration, drainage, drainage EC, and tomato yield. Time-variable inter-lighting and two different defoliation operations show sensitive responses in water management variables and yield.
SCIENTIA HORTICULTURAE
(2022)
Article
Horticulture
Jewook Choi, Jaewoo Kim, Hyo In Yoon, Jung Eek Son
Summary: This study investigated the growth and ginsenoside content of ginseng sprouts under different light treatments in a plant factory. The results showed that far-red light treatment reduced stem hardness, while UV-B radiation had no significant effect. Therefore, additional far-red lighting can be used to extend the cultivation period of ginseng sprouts.
HORTICULTURE ENVIRONMENT AND BIOTECHNOLOGY
(2022)
Article
Horticulture
Dongpil Kim, Taewon Moon, Sungmin Kwon, Inha Hwang, Jung Eek Son
Summary: Adding far-red light to red and blue inter-lighting can improve the growth and yield of sweet peppers in winter, but the effect is not significant in summer. Sufficient sunlight in summer makes additional far-red lighting unnecessary.
HORTICULTURE ENVIRONMENT AND BIOTECHNOLOGY
(2023)
Article
Agricultural Engineering
Hyo In Yoon, Jaewoo Kim, Jung Eek Son
Summary: This study aimed to develop an evaluation method for optimizing the lighting design of UV-B radiation in plant factories. The results showed that UV-B radiation significantly enhanced the bioactive compound contents and antioxidant capacity in kale plants. The study also analyzed different lighting system variables and found that adding UV-B LED as the optimal lighting design could improve the production of bioactive compounds in commercial plant factories.
BIOSYSTEMS ENGINEERING
(2022)
Article
Thermodynamics
Yong Hoon Im, Ju Young Lee, Tae In Ahn, Young Jik Youn
Summary: This study experimentally and theoretically investigates the thermal performance of oscillating heat pipe heat exchangers under temperature-controlled mode. It is found that smaller inclination angles delay the start-up and degrade the performance of the 5-turn oscillating heat pipe, while the 20-turn oscillating heat pipe shows consistent start-up operation and thermal performance regardless of inclination angles. The suggested theoretical model accurately predicts the thermal performance of the oscillating heat pipe heat exchangers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Analytical
Taewon Moon, Dongpil Kim, Sungmin Kwon, Tae In Ahn, Jung Eek Son
Summary: The objective of this study was to establish a non-destructive monitoring system for estimating the fresh weight and leaf area of trellised crops. Using a simple formula and a convolutional neural network, the crop fresh weight and leaf area could be accurately estimated. Therefore, this monitoring system has high versatility and can be widely applied for diverse data analyses.
Article
Horticulture
Dae Ho Jung, Inha Hwang, Jung Eek Son
Summary: This study aimed to estimate the photosynthesis of greenhouse-grown mangoes depending on the vertical position of CO2 enrichment. The results confirm that CO2 enrichment at adequate positions can enhance crop photosynthesis and CO2 utilization efficiency in greenhouses.
HORTICULTURE ENVIRONMENT AND BIOTECHNOLOGY
(2022)
Article
Agricultural Engineering
Inha Hwang, Seungri Yoon, Dongpil Kim, Jun Hyeun Kang, Jin Hyun Kim, Jung Eek Son
Summary: In greenhouses, sweet peppers with adequate stem density can improve fruit yield, but a higher number of stems may negatively affect growth and fruit yield. This study used 3D plant models and ray-tracing simulation to analyze the growth and yield of sweet pepper plants with different stem densities and evaluate the canopy light profile and photosynthesis. The results showed that under supplemental lighting, the dry weight of plants and total fruit yields were significantly higher than under natural light. This method can help determine stem density and supplemental lighting levels in greenhouse cultivation.
BIOSYSTEMS ENGINEERING
(2023)
Article
Thermodynamics
Yong Hoon Im, Ju Young Lee, Tae In Ahn, Young Jik Youn
Summary: This study suggests a natural cold energy storage method based on oscillating heat pipe (OHP) and presents experimental investigation on its operational characteristics at sub-zero temperatures. The results show that lower ambient temperature leads to better thermal performance of the OHP and increases the amount of stored cold energy.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Agriculture, Multidisciplinary
Dongpil Kim, Inseok Ra, Jung Eek Son
Summary: This study evaluated the quality and volatile compounds of greenhouse sweet pepper fruits under different lighting conditions. The results showed that adding far-red light to red/blue interlighting improved the fruit quality and taste perception.
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
(2023)
Article
Horticulture
Jun Hyeun Kang, Doyeon Kim, Hyo In Yoon, Jung Eek Son
Summary: The study investigates the long-term effects of spectrum conversion films (SCFs) on the growth, morphology, and photosynthetic activity of Chinese cabbage and romaine lettuce plants. The results show that SCF can significantly increase the photosynthetic efficiency and yield of Chinese cabbage, but it has no significant effects on lettuce.
HORTICULTURE ENVIRONMENT AND BIOTECHNOLOGY
(2023)
Article
Horticulture
Taewon Moon, Sieun Sim, Jung Eek Son
Summary: This study calibrated crop models for sweet peppers using Bayesian optimization and achieved high modeling efficiency. The method is applicable to unknown parameter distribution spaces and can be used for horticultural purposes, but more data is needed to ensure parameter convergence and construct robust crop models.
HORTICULTURE ENVIRONMENT AND BIOTECHNOLOGY
(2023)
Article
Agronomy
Taewon Moon, Hayoung Choi, Dongpil Kim, Inha Hwang, Jaewoo Kim, Jiyong Shin, Jung Eek Son
Summary: In this study, sweet pepper leaf models were generated and their traits were extracted using deep generative models. The modified GAN showed the highest performance, and the morphological traits of the leaves could be controlled through linear interpolation and simple arithmetic operations in the latent space.
Article
Horticulture
Tae-In Ahn, Jung-Eek Son
Summary: This study applied individual nutrient management to the alternative nutrient replenishment technique in an electrical conductivity (EC)-based closed-loop soilless culture system and compared its nutrient concentrations and crop productivity with a conventional open-loop system. The results showed that the alternative nutrient replenishment method had comparable nutrient management performance with the open-loop system under nutrient adjustment conditions.
