نتایج جستجو برای: water model

تعداد نتایج: 2577200  

ژورنال: علوم آب و خاک 2011
حدیثه نوری, , حمید زارع ابیانه, , حمیده نوری, , عبدالمجید لیاقت, , ولی الله کریمی, ,

Fertilizers in agriculture are potential sources of environmental pollution, especially in ground water quality and soil resources. Studying factors effective in water and nutrient transport through soil profile is helpful for nutrient management to minimize adverse impacts on environment and nitrate leaching below the root zone. In this study, the ground water level and nitrate leaching transp...

Satellite data have been used for temperature modeling both in urban areas and water. This paperstudies viability of ASTER satellite images that provide high spatial and spectral resolution to model watersurface temperature, as a fundamental water quality parameter. This study is focused on Dez dam reservoirresiding in Khuzestan province, south west of Iran. After the image corrections required...

Journal: :مدیریت آب و آبیاری 0
رزا جنوبی کارشناس ارشد گرایش آبیاری و زهکشی، دانشگاه ارومیه حسین رضایی دانشیار گروه مهندسی آب، دانشکدة کشاورزی، دانشگاه ارومیه جواد بهمنش استادیار گروه مهندسی آب، دانشکدۀ کشاورزی، دانشگاه ارومیه.

the groundwater resources of the urmia plain have been under intensive tension for the last recent years. this has caused the production and observation wells to become dry and in some local places well deepening to take place. in some other locations, the groundwater level is high and there is a danger of local water logging condition along with its associated drainage work. for the settlement...

A.R. Sepaskhah, N. Yarami

Water scarcity and salinity are important limitations for saffron (Crocus sativus L.) production in arid and semi-arid regions. The purpose of this research was to study the interaction effects of water salinity and deficit irrigation on the macroscopic water extraction model for saffron. The effect of salinity and water stress on root-water uptake coefficient was determined by additive and mul...

Journal: :آب و خاک 0
حمیدرضا جلیلی علی حسین زاده دلیر داوود فرسادی زاده

abstract one of the most important sources of drinking and agricultural water needs is rivers. one of the oldest methods of getting water from rivers that still has the greatest use is the gravity intake. in this type of intake, due to the disproportionate velocity at the upstream and downstream mouth of intake, occur flow separation and following sedimentation at the upstream mouth. in this st...

Journal: :تحقیقات آب و خاک ایران 0
غزاله ضیایی کارشناس ارشد آبیاری و زهکشی دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران، گروه مهندسی آب حسین بابازاده استادیار دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران، گروه مهندسی آب فریبرز عباسی استاد پژوهشی مرکز تحقیقات فنی و مهندسی کشاورزی کرج فریدون کاوه دانشیار دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران، گروه مهندسی آب

importance of fresh water in agriculture along with the essential demand of the growing population for food, indicates an extreme necessity of the optimum use of water. to this end, plant growth simulation models have been introduced in agricultural sciences to reach maximum yields in varying climates. variations in the of developed models cause difficulties for the unprofessional users. the aq...

Journal: :تحقیقات آب و خاک ایران 0
علی حیدر نصرالهی دانشگاه لرستان- استادیار گروه مهندسی آب دانشکده کشاورزی و منابع طبیعی سعید برومند نسب دانشگاه شهید چمران عبدالرحیم هوشمند دانشگاه شهید چمران مولود حیدری نیا دانشگاه شهید چمران اهواز

irrigation with saline water needs to the different managements to reduce the harmful effects of salinity on plants, soil and the environment. simulation models are the useful tool to irrigation management in conditions of soil and water salinity because, they can predict crop yield and soil conditions considering to different climate, plant and management practices. in this study, the saltmed ...

N. Dashtian Gerami N. Khazraiyan,

In this article, Finite Element Method (FEM) and Eulerian-Lagrangies Algorithm (ELA) formulation were used to numerically simulate the impact of several low-velocity projectiles with water surface. Material models which were used to express behavior of air and water included Null material model. For the projectiles, rigid material model were applied. Results were validated by analyzing the impa...

Journal: :مدیریت آب و آبیاری 0
رضوانه مومنی کارشناس پژوهشی گروه مهندسی آبیاری و زهکشی، پردیس ابوریحان، دانشگاه تهران محمودرضا بهبهانی دانشیار گروه مهندسی آبیاری و زهکشی، پردیس ابوریحان، دانشگاه تهران محمد هادی نظری فر کارشناس پژوهشی گروه مهندسی آبیاری و زهکشی، پردیس ابوریحان، دانشگاه تهران بهزاد آزادگان استادیار گروه مهندسی آبیاری و زهکشی، پردیس ابوریحان، دانشگاه تهران

water productivity is a function of crop yield and management operation. determination of different yield levels through field experiments is difficult. therefore, applying simulation model is an approach which makes possible to assess water balance, simulate growth process and survey different scenarios. using the cropsyst crop growth model to analyze water productivity, as an indicator of wat...

Journal: :international journal of advanced design and manufacturing technology 0
najmeh khazraiyan islamshahr university n. dashtian gerami m. damircheli

in this article, finite element method and ale formulation were used to numerically simulate impact of low-velocity specific projectiles with water surface. for the simulation, ls-dyna finite element code was used. material models which were used to express behavior of air and water included null material model. for the projectile, plastic-kinematics material model was applied. mie-gruneisen eq...

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