نتایج جستجو برای: infiltration water

تعداد نتایج: 599727  

Journal: :آب و خاک 0
قربانی دشتکی قربانی دشتکی همایی همایی مهدیان مهدیان

abstract infiltration is a significant process which controls the fate of water in the hydrologic cycle. the direct measurement of infiltration is time consuming, expensive and often impractical because of the large spatial and temporal variability. artificial neural networks (anns) are used as an indirect method to predict the hydrological processes. the objective of this study was to develop ...

2014
Lili Chen Zhiyou Yuan Hongbo Shao Dexiang Wang Xingmin Mu

Thinning is a crucial practice in the forest ecosystem management. The soil infiltration rate and water storage capacity of pine-oak mixed forest under three different thinning intensity treatments (15%, 30%, and 60%) were studied in Qinling Mountains of China. The thinning operations had a significant influence on soil infiltration rate and water storage capacity. The soil infiltration rate an...

Journal: :تحقیقات آب و خاک ایران 0
غزاله ضیایی کارشناس ارشد آبیاری و زهکشی فریبرز عباسی موسسه تحقیقات فنی و مهندسی کشاورزی حسین بابازاده دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران فریدون کاوه دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران

recognition of soil water infiltration process is essential for improving irrigation efficiency, decreasing water losses and management of surface runoff. the aim of this research was to evaluate temporal variation of the kostiakove-louise infiltration coefficient parameters during a corn growing season. in this research, 16 irrigation events for 8 large scale furrow experiments were analyzed b...

Journal: :پژوهش آب در کشاورزی 0

infiltration and its modeling are important in design and implementation of irrigation projects, drainage, water-resources management, soil-conservation, hydrological studies, and artificial-recharge of groundwater and are influenced by different characteristics of soil and infiltrated water including the amount of salinity and sodium. the aim of this study was to evaluate the infiltration mode...

Journal: :تحقیقات مهندسی کشاورزی 0
سیدمحمدرضا امینی زاده دانشجوی کارشناسی ارشد رشتة آبیاری و زهکشی از گروه آبیاری دانشگاه تهران محمد محمودیان شوشتری استــاد گروه مهندسی عمران، دانشگاه شهید چمران اهواز عبدالمجید لیاقت استادیار گروه مهندسی آبیاری و آبادانی دانشگاه تهران. صلاح کوچک زاده دانشیار گروه مهندسی آبیاری و آبادانی دانشگاه تهران.

infiltration in furrow irrigation is 2-d which depends on both time and surface characteristics at which infiltration occurs. however, in many furrow irrigation models, infiltration is determined as a function of infiltration time opportunity, assuming the variation of weted perimeter is low along furrow. in order to compare the proposed asumptions, two zero-inertia furrow irrigation models wer...

Infiltration of water into the soil accounts as a phenomenon in which most of researchers and scientists are interested so it acts a prominent role in the water cycling. Owing to temporal and spatial variation of infiltration, measuring of it in a direct way requires a long time and high cost. Thus, using a method for measuring the soil infiltration in an indirect way instead of direct way for ...

2016
James Moraes de Almeida Caetano Rodrigues Miranda

Fluid flow through minerals pores occurs in underground aquifers, oil and shale gas reservoirs. In this work, we explore water and oil flow through silica nanopores. Our objective is to model the displacement of water and oil through a nanopore to mimic the fluid infiltration on geological nanoporous media and the displacement of oil with and without previous contact with water by water floodin...

2013
Wenhua Zhuang Longguo Li Chao Liu

Based on the laboratory study, the effects of sodium polyacrylate (SP) was investigated at 5 rates of 0, 0.08, 0.2, 0.5, and 1%, on water retention, saturated hydraulic conductivity(Ks), infiltration characteristic and water distribution profiles of a sandy soil. The results showed that water retention and available water capacity effectively increased with increasing SP rate. The Ks and the ra...

Journal: :آب و خاک 0
مهدی پناهی سید مجید میرلطیفی فریبرز عباسی

abstract this study addresses two dimensional infiltration from irrigated furrows. the basic approach is to develop a two-dimensional infiltration as a combination of the corresponding one-dimensional vertical and an edge effect. the edge effect is the difference between the cumulative infiltration per unit of adjusted wetting perimeter and the corresponding one-dimensional infiltration. this a...

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