Article
Engineering, Civil
Bo Liu, Huanhao Han, Xuechi Liu, Cheng Li, Xiaoping Chen, Hao Wu, Yufeng Luo, Yuanlai Cui
Summary: Understanding the variation and magnitude of crop coefficient (Kc) is crucial for accurately determining crop evapotranspiration (ETc). This study conducted a three-year experiment in the Poyang River basin, southern China, to develop local Kc and investigate the characteristics of advection and its contribution to Kc. The results showed that advection existed in the humid paddy field and had a considerable effect on Kc.
JOURNAL OF HYDROLOGY
(2022)
Article
Agricultural Engineering
Sumon Datta, Mukesh Mehata, Saleh Taghvaeian, Daniel Moriasi, Patrick J. Starks
Summary: The study in an agricultural watershed in west-central Oklahoma over three years found that almost all studied fields were under-irrigated, leading to a reduction in all fluxes. The models showed notable differences between actual fluxes and those calculated based on well-watered conditions.
JOURNAL OF IRRIGATION AND DRAINAGE ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Albert Nkwasa, Celray James Chawanda, Jonas Jagermeyr, Ann van Griensven
Summary: Most hydrological models fail to accurately represent crop cultivation and management practices. This study presents an approach to incorporate crop phenology in a regional hydrological model and evaluates its impact on simulations. The results show that improved representation of crop phenology leads to better simulation results.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2022)
Article
Environmental Sciences
Jorge L. Pena-Arancibia, Mobin-ud-Din Ahmad
Summary: This study evaluates the year-to-year inter-seasonal irrigation performance in 46 canal commands in the Indus Basin irrigated system using satellite-driven actual evapotranspiration estimates. Results show that canal commands with access to groundwater exhibit more equity and less inter-seasonal variability compared to those reliant on surface water supplies. Additionally, canal commands mostly show slightly increasing ETa and low inter-seasonal variability in both irrigation seasons, except for two canal commands at the system-end which exhibit higher variability and inequity.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Shuai Wang, Chaozi Wang, Chenglong Zhang, Jingyuan Xue, Pu Wang, Xingwang Wang, Weishu Wang, Xin Zhang, Wangcheng Li, Guanhua Huang, Zailin Huo
Summary: In this study, a classification-based spatiotemporal adaptive fusion model (CSAFM) is proposed to improve the fusion accuracy of evapotranspiration (ET) in irrigated agricultural areas. The model takes into account the effects of soil moisture and crop category on ET, and utilizes the spatiotemporal adaptive reflectance fusion model (STARFM) for fusion. Compared to other mainstream fusion models, CSAFM demonstrates higher fusion accuracy and adaptability.
REMOTE SENSING OF ENVIRONMENT
(2022)
Article
Environmental Sciences
James Solum, Bwalya Malama
Summary: The study measured sap flow and tree sapwood area in a riparian forest in Santa Cruz County, California, and upscaled the measurements to estimate evapotranspiration and quantify groundwater usage by dominant vegetation. The results showed a positive correlation between sap flow-based estimates and estimates from other methods, highlighting the importance of ground-based measurements for calibration and site-specific estimates.
Article
Geosciences, Multidisciplinary
Aaron Smith, Doerthe Tetzlaff, Lukas Kleine, Marco Maneta, Chris Soulsby
Summary: Quantifying the role of vegetation in water partitioning at different spatial and temporal scales is crucial for sustainable land and water management. Tracers provide effective calibration constraints on larger resolution ecohydrological modelling, helping to understand the influence of grid resolution on the simulation of vegetation-soil interactions.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2021)
Article
Horticulture
E. B. Lulane, S. Dzikiti, T. Volschenk, E. Lotze, S. J. E. Midgley
Summary: Apple producers are using nets to address climate and pest-related challenges. This study found that under fixed nets, water use in apple orchards decreased and water saving benefits were smaller than expected.
SCIENTIA HORTICULTURAE
(2022)
Article
Multidisciplinary Sciences
Yasutaka Goto, Ichiro Yasuda, Maki Nagasawa, Shinya Kouketsu, Toshiya Nakano
Summary: A new technique for measuring ocean turbulence using fast-response thermistor has been developed, which shows that the numerical model overestimates the intensity of turbulence. This can be refined by comparing the model with observed results.
SCIENTIFIC REPORTS
(2021)
Article
Geosciences, Multidisciplinary
Alban de Lavenne, Vazken Andreassian, Louise Crochemore, Goran Lindstrom, Berit Arheimer
Summary: This article presents a new approach to quantifying the multi-year hydrological memory of a catchment, using streamflow and climate data. The study finds a strong relationship between the humidity index and memory, with drier regions having longer memory. The work highlights the importance of accounting for catchment memory in elasticity analysis.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2022)
Article
Agronomy
Yanan Chen, Zhi Ding, Pujia Yu, Hong Yang, Lisheng Song, Lei Fan, Xujun Han, Mingguo Ma, Xuguang Tang
Summary: Efficient utilization of limited water resources and improving agricultural water use efficiency are major challenges for global food security. This study used carbon and water flux data from multiple site-years to analyze the variability in canopy-scale transpiration and ecosystem-scale evapotranspiration across major crops, including maize, winter wheat, and soybean. The results revealed seasonal patterns and differences among the crops in terms of transpiration and evapotranspiration, as well as water use efficiencies.
AGRICULTURAL WATER MANAGEMENT
(2022)
Article
Environmental Sciences
Zonghan Ma, Bingfang Wu, Nana Yan, Weiwei Zhu, Hongwei Zeng, Jiaming Xu
Summary: This study proposes a new method for estimating field-scale evapotranspiration by developing an allocation factor to quantify field-level ET variations and allocate coarse ET to the field scale. The results of the allocation ET model show improved accuracy compared with coarse data after validation at ground observation stations, providing reasonable spatial results for precise agricultural ET management.
Article
Environmental Sciences
Nicolo Colombani, Mattia Gaiolini, Gianluigi Busico, Matteo Postacchini
Summary: This study used a numerical model to analyze the impact of evapotranspiration on aquifer-river exchanges in the Tronto river alluvial aquifer, finding that evapotranspiration can account for up to 21% of the hydrogeological balance. Baseflow observations are crucial for quantifying the impact of evapotranspiration.
Article
Geosciences, Multidisciplinary
Peter Widmoser, Dominik Michel
Summary: This study investigates the causes of energy imbalance and methods for energy balance closure, applying a specific method to experimental data under different climate conditions. Results show a good match between LY and EC measurements after evaporation-linked weights are applied, but large differences in standard deviations remain between the two.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2021)
Article
Engineering, Civil
Xingwang Wang, Xianghao Wang, Qiangli Wei, Weishu Wang, Shuai Wang, Zailin Huo, Huimin Lei
Summary: Understanding water and carbon fluxes in agroecosystems is crucial for water management in arid regions. This study monitored NEE and ET in an irrigated maize field, finding that WUE varied throughout the growing season, with the highest WUE observed during the heading stage. Factors such as PAR and VPD influenced the diurnal dynamics of NEE and ET, with high VPD decreasing WUE in irrigated maize fields.
JOURNAL OF HYDROLOGY
(2021)
Article
Agronomy
Jerry E. Moorhead, Gary W. Marek, Prasanna H. Gowda, Xiaomao Lin, Paul D. Colaizzi, Steven R. Evett, Seth Kutikoff
Article
Environmental Sciences
Hanna Huryna, Yafit Cohen, Arnon Karnieli, Natalya Panov, William P. Kustas, Nurit Agam
Article
Agronomy
Isaac Kramer, Nurit Agam, Pedro Berliner
AGRICULTURAL AND FOREST METEOROLOGY
(2020)
Article
Multidisciplinary Sciences
Simone Fatichi, Dani Or, Robert Walko, Harry Vereecken, Michael H. Young, Teamrat A. Ghezzehei, Tomislav Hengl, Stefan Kollet, Nurit Agam, Roni Avissar
NATURE COMMUNICATIONS
(2020)
Article
Plant Sciences
Kelem Gashu, Noga Sikron Persi, Elyashiv Drori, Eran Harcavi, Nurit Agam, Amnon Bustan, Aaron Fait
FRONTIERS IN PLANT SCIENCE
(2020)
Article
Agronomy
D. Kool, W. P. Kustas, A. Ben-Gal, N. Agam
Summary: Partitioning of evapotranspiration into soil water evaporation and transpiration allows separate assessment of soil and plant water, energy, and carbon exchange. Remote sensing-based models are ideally suited to monitor ET over large areas, but ET partitioning estimates vary widely. The two-source energy balance (TSEB) model was evaluated for seasonal ET partitioning, showing improved results with adaptations to plant transpiration parameters and soil heat flux, yet inferior performance when using measured soil and vine temperatures.
AGRICULTURAL AND FOREST METEOROLOGY
(2021)
Article
Engineering, Civil
D. Kool, E. Agra, A. Drabkin, A. Duncan, P. P. Fendinat, S. Leduc, G. Lupovitch, A. N. Nambwandja, N. S. Ndilenga, T. Nguyen Thi, B. Poodiack, L. Sagi, Y. Shmuel, G. Maggs-Kolling, E. Marais, B. Pinshow, J. S. Turner, N. Agam
Summary: The Namib Sand Sea is a hyper-arid coastal fog desert where fog, dew and water vapor adsorption are important for ecohydrology. Water vapor adsorption was found to be the primary form of non-rainfall water inputs, even on nights with fog.
JOURNAL OF HYDROLOGY
(2021)
Article
Horticulture
Daniela Jerszurki, Tal Saadon, Jingbo Zhen, Nurit Agam, Eran Tas, Shimon Rachmilevitch, Naftali Lazarovitch
Summary: The vertical microclimate inside a greenhouse can greatly impact plant production and yield quality, with ventilation and shading curtains playing a crucial role. Proper management of air circulation and CO2 levels is essential to maximize plant growth and minimize heat losses.
SCIENTIA HORTICULTURAE
(2021)
Article
Agronomy
Fan Chen, Fangni Lei, Kyle Knipper, Feng Gao, Lynn McKee, Maria del Mar Alsina, Joseph Alfieri, Martha Anderson, Nicolas Bambach, Sebastian J. Castro, Andrew J. McElrone, Karrin Alstad, Nick Dokoozlian, Felix Greifender, William Kustas, Claudia Notarnicola, Nurit Agam, John H. Prueger, Lawrence E. Hipps, Wade T. Crow
Summary: Efforts to apply gridded root-zone soil moisture (RZSM) products for irrigation decision-support in vineyards face challenges in obtaining products that meet required accuracy, resolution, and latency requirements. This study explores the potential of the Vineyard Data Assimilation (VIDA) system, which assimilates high-resolution soil moisture information from remote sensing, to improve irrigation modeling in vineyards. Results show that VIDA can capture temporal variations in RZSM and assimilating remote sensing products can enhance its temporal accuracy. However, limitations exist in correcting biases in assumed irrigation applications, particularly during well-watered periods.
IRRIGATION SCIENCE
(2022)
Article
Agronomy
Rui Gao, Alfonso F. Torres-Rua, Mahyar Aboutalebi, William A. White, Martha Anderson, William P. Kustas, Nurit Agam, Maria Mar Alsina, Joseph Alfieri, Lawrence Hipps, Nick Dokoozlian, Hector Nieto, Feng Gao, Lynn G. McKee, John H. Prueger, Luis Sanchez, Andrew J. Mcelrone, Nicolas Bambach-Ortiz, Calvin Coopmans, Ian Gowing
Summary: This study explores the use of machine learning algorithms and high-resolution unmanned aerial system information for LAI estimation, finding that a hybrid ML technique using RF and RVM with a Fast Approach performs well in terms of accuracy and efficiency.
IRRIGATION SCIENCE
(2022)
Article
Plant Sciences
Kelem Gashu, Chao Song, Arvind Kumar Dubey, Tania Acuna, Moshe Sagi, Nurit Agam, Amnon Bustan, Aaron Fait
Summary: This study investigated the impact of climate variations on grape berry quality by exploiting the consistent differences in radiation and average air temperature between two experimental vineyards. The results showed that warmer climates were associated with carotenoid degradation and lower flavonol contents, while radiation and temperature were closely linked to phenylpropanoid metabolism in the berries. This suggests that warmer climates have potentially harmful effects on grape quality.
FRONTIERS IN PLANT SCIENCE
(2022)
Editorial Material
Agronomy
William P. Kustas, Andrew J. McElrone, Nurit Agam, Kyle Knipper
Summary: This special issue of GRAPEX advances the research on vine water use and stress measurement and remote sensing. The collaborative experiment has led to the development of new tools and techniques to improve irrigation management in vineyards.
IRRIGATION SCIENCE
(2022)
Article
Environmental Sciences
Rui Gao, Alfonso F. Torres-Rua, Hector Nieto, Einara Zahn, Lawrence Hipps, William P. Kustas, Maria Mar Alsina, Nicolas Bambach, Sebastian J. Castro, John H. Prueger, Joseph Alfieri, Lynn G. McKee, William A. White, Feng Gao, Andrew J. McElrone, Martha Anderson, Kyle Knipper, Calvin Coopmans, Ian Gowing, Nurit Agam, Luis Sanchez, Nick Dokoozlian
Summary: Evapotranspiration (ET) is a crucial factor in commercial grapevine production, and its partitioning allows for separate assessment of soil and vine water and energy fluxes. Small unmanned aerial systems (sUAS) coupled with the two-source energy balance (TSEB) model provide a method for ET estimation and partitioning in vineyards. This study explores the assessment of ET and its partitioning using ground-based information and high-resolution sUAS imagery.
Proceedings Paper
Automation & Control Systems
Rui Gao, Alfonso Torres-Rua, Ayman Nassar, Joseph Alfieri, Mahyar Aboutalebi, Lawrence Hipps, Nicolas Bambach Ortiz, Andrew J. Mcelrone, Calvin Coopmans, William Kustas, William White, Lynn McKee, Maria del Mar Alsina, Nick Dokoozlian, Luis Sanchez, John H. Prueger, Hector Nieto, Nurit Agam
Summary: The study successfully estimated leaf area index in vineyards using drone data and a machine learning model. Different energy balance models were applied for ET partitioning, showing variations in performance in different environments.
AUTONOMOUS AIR AND GROUND SENSING SYSTEMS FOR AGRICULTURAL OPTIMIZATION AND PHENOTYPING VI
(2021)
Article
Agricultural Engineering
F. R. Lamm, D. O. Porter, J. P. Bordovsky, S. R. Evett, S. A. O'Shaughnessy, K. C. Stone, W. L. Kranz, D. H. Rogers, P. D. Colaizzi
TRANSACTIONS OF THE ASABE
(2019)