نتایج جستجو برای: samani
تعداد نتایج: 190 فیلتر نتایج به سال:
Large-scale photovoltaic (PV) power plants may affect the hydrological cycle in all its components. Among various components, evapotranspiration is one of most important. As a preliminary step for assessing impacts PV on evapotranspiration, this study, we performed an evaluation study methods estimating reference (ETo). FAO and ASCE recommend Penman–Monteith (PM) method estimation ETo when data...
abstract in this study, impact of climate change on net irrigation requirement (in) and yield of wheat using cgcm3 climate projection model, one of the aogcm models, in behshahr area is evaluated. changes in temperature and precipitation were simulated run under the ipcc scenario a2 for 2011-2040, 2041-2070 and 2071-2100 periods. this work was done by using statistical and proportional downscal...
Abstract The study aimed to evaluate the accuracy of empirical equations (Hargreaves-Samani; HS, Irmak; IR and Dalton; DT) multivariate linear regression models (MLR1–6) for estimating reference evapotranspiration (ET Ref ) in different climates Iran based on Köppen method including arid desert (Bw), semiarid (Bs), humid with mild winters (C), severe (D). For this purpose, climatic data 33 mete...
Proper irrigation scheduling and agricultural water management require a precise estimation of crop requirement. In practice, reference evapotranspiration (ETo) is firstly estimated, used further to calculate the each crop. this study, two new coupled models were developed for estimating daily ETo. Two optimization algorithms, shuffled frog-leaping algorithm (SFLA) invasive weed (IWO), on an ad...
امروزه آنالیزهای تحلیلی و عددی در بررسی میزان تبادل آب بین منابع آب زیرزمینی و سطحی از اهمیت زیادی برخوردارند. چاه های پمپاژ که به عنوان رایج ترین شیوه در بهره برداری منابع آب مطرح هستند، در صورتی که در نزدیکی منابع آب سطحی نظیر رودخانه حفر شوند می توانند تعادل بین آب های سطحی و زیرزمینی را برهم زنند و در صورتی که مدیریت مناسب بر استخراج آب زیرزمینی اعمال نگردد سبب بروز مشکلاتی نظیر افت شدید در...
The aim of this study was prediction of marital adjustment based on decision making and problem solving, family solidarity, coping strategies, communication skills, and religious beliefs. Research method was descriptive and from correlation type. The statistical population were all married teachers of elementary schools in Karaj city in the academic year 2014-2015 that by using random cluster s...
Embryos and gamete cryopreservation contract is a contract between the embryos cryopreservation applicant and cryopreservation centers to freeze and preserve their embryos and gamete. This article aims to review constitutional conditions of validity, parties` obligation, sanction and dissolution methods of embryos and gamete cryopreservation contract. Research method has been revision in some p...
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...
Drought monitoring is a complicated issue as it requires multiple meteorological variables to monitor and anticipate drought accurately. Therefore, developing method that enables researchers, data scientists, planners comprehend mitigation policies more accurately essential. In this research, based on the concepts behind calculation of Standardized Precipitation Evapotranspiration Index (SPEI),...
Daily solar radiation intercepted at the earth’s surface is an input required for water resources, environmental and agricultural studies. However, the measurement of this parameter can only be done in a few places. This has led researchers to develop a number of methods for estimating solar radiation based on frequently available meteorological records such as hours of sunshine or air temperat...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید