Results 81 to 90 of about 35,573 (203)

Timing Matters: Rethinking How we Define the Water Year

Hydrological Processes, Volume 40, Issue 6, June 2026.
For annual hydrological analyses, the start of the water year must be defined. Using a modelling approach, we identify the day of the year with the smallest variation in simulated catchment storage. The results indicate that these dates often differ from the official start of the water year.
Jan Seibert, Marc Vis, Franziska Clerc‐Schwarzenbach, Maria Staudinger, Ilja van Meerveld   +4 more
wiley   +1 more source

Regionalization of the Hargreaves-Samani Coefficients to Estimate Reference Evapotranspiration in High-Altitude Areas

Atmosphere
The Penman-Monteith (PM) equation is considered the most accurate method for estimating reference evapotranspiration (ETo); however, its application requires a large amount of data that is not always available. This study aimed to regionalize the coefficients of the Hargreaves-Samani (HS) equation to estimate ETo in high-altitude areas, specifically ...
Apolinario Lujano, Miguel Sanchez-Delgado, Nestor Montalvo-Arquiñigo, Absalon Vasquez-Villanueva, Abel Mejia-Marcacuzco, Efrain Lujano   +5 more
openaire   +2 more sources

Intra‐Annual Chlorophyll‐a Dynamics Under Hydroclimatic Extremes Derived From a 44‐Year Baseline: Insights From a Temperate River System (Nakdong River Basin, South Korea)

Water Resources Research, Volume 62, Issue 6, June 2026.
Abstract Understanding how drought affects phytoplankton dynamics is critical for developing early warning systems. Using standardized drought indices that capture both hydrometeorological extremes, we investigated how hydrological anomalies modulate intra‐annual chlorophyll‐a (Chla) concentrations, a proxy for phytoplankton biomass, in South Korea's ...
Pamela Sofia Fabian, YoonKyung Cha, Hyun‐Han Kwon   +2 more
wiley   +1 more source

Verification SEBAL and Hargreaves –Samani Models to Estimate Evapotranspiration by Lysimeter Data

مجله آب و خاک, 2017
Introduction: Evapotranspiration (ET) is an important component of the hydrological cycle, energy equations at the surface and water balance. ET estimation is needed in various fields of science, such as hydrology, agriculture, forestry and pasture, and water resources management.
Ali Morshedi, Sayyed Hasan Tabatabaei, Mehdi Naderi   +2 more
openaire   +1 more source

ESTIMATION OF REFERENCE EVAPOTRANSPIRATION BY HARGREAVES-SAMANI AND PENMAN-MONTEITH METHODS IN MEDITERRANEAN ENVIRONMENT (PORTUGAL)

Finisterra - Revista Portuguesa de Geografia
Estimar com precisão a evapotranspiração de referência (ETo) é fundamental para avaliar as necessidades hídricas das culturas, apoiar programas de irrigação, estudos de alterações climáticas e muitas aplicações de análise e mapeamento.
Andrade, José Alexandre, Ventura, Raquel   +1 more
openaire   +5 more sources

Projected Evolution of Climatic Aridity in Spain: Robust Signals and Model Uncertainties

International Journal of Climatology, Volume 46, Issue 6, May 2026.
This study examines the projected evolution of climatic aridity in Spain throughout the 21st century, using the UNEP Aridity Index and CMIP6 simulations under different emission scenarios and global warming levels. Despite model biases, results show a general increase in aridity across the country, particularly in southern regions and the Canary ...
Víctor Trullenque‐Blanco, María del Mar Rondón Velasco, Maialen Iturbide, José Manuel Gutiérrez, Sergio M. Vicente‐Serrano, Santiago Beguería   +5 more
wiley   +1 more source

Potencial de evapotranspiración para la costa sur de Puerto Rico usando la técnica de Hargreaves-Samani

, 1988
The Hargreaves and Samani model was used to estimate monthly potential evapotranspiration (PET) for Central Aguirre, Fortuna and Lajas substations and Magueyes Island located on the south coast of Puerto Rico.

core   +1 more source

Probabilistic Agro‐Hydrology: A Stochastic Framework for Irrigation Risk Assessment and Water Management

Water Resources Research, Volume 62, Issue 5, May 2026.
Abstract Irrigation plays a critical role in stabilizing agricultural productivity under increasing climatic variability. However, the intensification of droughts and extreme weather events is revealing the vulnerability of irrigation systems, particularly due to mismatches between peak water needs and natural water availability.
D. D. Chiarelli, E. Volpi, A. Fiori, M. C. Rulli   +3 more
wiley   +1 more source

The maximum, minimum, mean, standard deviation, correlation coefficient, R², RMSE and MBE for the solar radiation estimates generating using the Hargreaves & Samani, Bristow & Campbell, Donatelli & Campbell, and Goodin models.

, 2019
The maximum, minimum, mean, standard deviation, correlation coefficient, R2, RMSE and MBE for the solar radiation estimates generating using the Hargreaves & Samani, Bristow & Campbell, Donatelli & Campbell, and Goodin models.
Benjamin F. Zaitchik (569823), Dereje Ademe (6396947), Sintayehu Musie (6396950), Stephanie Stettz (6396944), Belay Simane (6396953)   +4 more
core   +1 more source

Improvement of Hargreaves–Samani Reference Evapotranspiration Estimates in the Peruvian Altiplano

, 2023
The FAO 56 Penman–Monteith equation (PM) is considered the most accurate method for estimating reference evapotranspiration (ETo). However, PM requires a large amount of data that is not always available.
Miguel Sanchez-Delgado, Apolinario Lujano, Efrain Lujano   +2 more
core   +1 more source