نتایج جستجو برای: hargreaves samani
تعداد نتایج: 589 فیلتر نتایج به سال:
The Food and Agricultural Organization of the United Nations (FAO) Penman–Monteith (PM) method is widely regarded as most effective reference evapotranspiration (ETo) estimator; however, it requires a wide range data that may be scarce in some rural regions. When feasible relative humidity, solar radiation wind speed are unavailable, temperature-based useful to estimate ETo provide suitable sup...
Several studies have projected increases in drought severity, extent and duration in many parts of the world under climate change. We examine sources of uncertainty arising from the methodological choices for the assessment of future drought risk in the continental US (CONUS). One such uncertainty is in the climate models' expression of evaporative demand (E0), which is not a direct climate mod...
Suyun öneminin tartışılmaz olduğu gerçeğini göz önüne alarak, hidrolojik çevrimin ve onun en karmaşık bileşenlerinden biri olan evapotranspirasyon (ET) kaybının iyi belirlenmesi gerekmektedir. Topraktan açık su yüzeylerinden buharlaşma bitkilerden terleme yoluyla kaybedilen suyun birleşimi olarak tanımlanan ET değerini belirlemek amacıyla birçok ampirik yöntem geliştirilmiş bu yöntemler üzerind...
Accurately estimating and forecasting evapotranspiration is one of the most important tasks to strengthen water resource management, especially in desert areas such as La Yarada, Tacna, Peru, a region located at head Atacama Desert. In this study, we used temperature, humidity, wind speed, air pressure, solar radiation from local weather station forecast potential (ETo) using machine learning. ...
This study analyses long-term changes in drought indices (Standardised Precipitation Index—SPI, Standardised Precipitation–Evapotranspiration Index—SPEI) at 1 and 3 months scales 182 stations 11 central eastern European countries during 1949–2018. For comparative purposes, the necessary atmospheric evaporative demand (AED) to obtain SPEI was calculated using two methods, Hargreaves-Samani (SPEI...
Studies examining potential evapotranspiration (PET) for a mature forest reference compared with standard grass are limited in the current literature. Data from three long-term weather stations located within 10 km of each other in the USDA Forest Service Santee Experimental Forest (SEF) in coastal South Carolina were used to (1) evaluate monthly and annual PET estimates from five different met...
iran was located in the arid belt and desert region of the world. this climatic situation was presented in several parts of iran such as qazvin. evapotranspiration is one the most important parameter which was effect on agricultural development. there are different methods for estimating this item which selected by climatic conditions. this research concentrates to evaluate 28 empirical and com...
Accurate estimation of reference evapotranspiration is essential for agricultural management and water resources engineering applications. In the present study, ability precision three artificial intelligence (AI) models (i.e., Support Vector Machines (SVMs), Adaptive Neuro-Fuzzy Inference System (ANFIS) Categorical Boosting (CatBoost)) were assessed estimating daily (ET0) using limited weather...
مدلهای زیادی بر مبنای گروههای رطوبتی، تشعشعی، دمایی و ترکیبی در برآورد تبخیرتعرق وجود دارد. هدف اصلی این تحقیق کالیبراسیون روشهای تبخیرتعرق و انتخاب بهترین روش، تحت شرایط اقلیمی متفاوت در استانهای ایران است. در این تحقیق، اقدام به جمعآوری دادههای هواشناسی از 10 ایستگاه سینوپتیک در استانهای ایران شده است و در مقایسهای که بین نتایج تبخیرتعرق محاسبه شده بر مبنای چهار گروه تجربی موجود و د...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید