نتایج جستجو برای: improving exploitation model of water resources

تعداد نتایج: 21446256  

Aminreza Neshat, Hamid Kardan Moghaddam Saman Javadi,

Quantitative changes in groundwater and crises resulting from uncontrolled water extraction have turned water resources management into one of the supply-demand dilemmas in arid regions. The present study evaluated the quantitative situation of water resources in the Ardestan Plain adjoining the Ardestan desert by using the MODFLOW mathematical model. Simulation of groundwater flow in the stead...

ژورنال: آبخیزداری ایران 2019

By understanding the temporal and spatial variations of water resources in a region, the better management and planning of water resources and water consumptions can be done. Time series modeling, if used correctly, will lead to acceptable results in this regard. For this purpose, the monthly runoff time series for 28 years was prepared at the hydrometric stations of Mehregerd region and the pr...

Journal: :اقتصاد و توسعه کشاورزی 0
علی بخشی رضا مقدسی محمود دانشور کاخکی

abstract management of water resources in iran is faced with growing demand for water resources, a considerable increase in the costs of supplying additional water and uncontrolled exploitation of underground waters. economists suggest water pricing to improve water use efficiency; however, government tends to reject that advice due to political risk, economic and cultural concerns. we used a p...

Journal: :desert 2012
arash malekian m. mahdavi m. kholghi gh.r. zehtabian m. mohseni saravi

the world is facing severe challenges in meeting the rapidly growing demand for water resources. in addition,irrigation water which is the largest use of water in most developing countries and arid and semi arid regions, will likelyhave to be diverted increasingly to meet the needs of the households in urban areas and industry sectors whilst remaining aprime engine of agricultural growth. a lin...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده مهندسی عمران 1391

one of the most commonly used techniques to reduce the corrosion rate of rebar in concrete is addition substances named corrosion inhibitors into the concrete. corrosion inhibitor is chemical compounds that were added to concrete to prevent corrosion of steel in concrete. sodium nitrate is a type of anodic inhibitors that this study investigatesthe effect of this inhibitor on the properties of ...

Journal: :کشاورزی (منتشر نمی شود) 0
زهرا زارعی دستگردی مربی، دانشگاه پیام نور مرکز گلپایگان، اصفهان هوشنگ ایروانی دانشیار، دانشکده اقتصاد و توسعه کشاورزی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران حسین شعبانعلی فمی دانشیار، دانشکده اقتصاد و توسعه کشاورزی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران آرزو مختاری حصاری مربی، دانشگاه پیام نور مرکز اهر، آذربایجان شرقی

a number of 1810 members of the water user associations (wuas) of jarghouyeh district consisted the statistical population of the study, out of which 150 farmers were selected as sample using proportionate stratified random sampling technique. a questionnaire was developed for gathering the data and information. content validity and cronbach alpha proved both the validity and reliability of the...

ژورنال: علوم آب و خاک 2015
عابدی کوپایی, جهانگیر , گلابچیان, مریم ,

Nowadays, due to the high potential of advanced simulation models for groundwater, these models are comprehensively applied in the management and exploitation of groundwater resources. The aim of this study was to investigate and simulate the groundwater resources in Kouhpayeh-Segzi watershed and in particular estimate the hydrodynamic coefficients of unconfined aquifer. After preparation of in...

Journal: :مرتع و آبخیزداری 0
شیما نیکو استادیار دانشکدة کویرشناسی، دانشگاه سمنان حسین آذرنیوند استاد دانشکدة منابع طبیعی، دانشگاه تهران غلامرضا زهتابیان استاد دانشکدة منابع طبیعی، دانشگاه تهران حسن احمدی استاد دانشکدة منابع طبیعی، دانشگاه تهران محمد علی زارع چاهوکی دانشیار دانشکدة منابع طبیعی، دانشگاه تهران

combating desertification which is a serious threat for the environment and human welfare requires understanding complex issues of this phenomenon using evaluation, awareness of severity of it's processes and determination of it's factors. so here, after recognizing the characteristics of the region showing existence desertification, we assess its current status with emphasis on clima...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد گرمسار - پژوهشکده علوم انسانی و اجتماعی 1391

abstract the present study was conducted to investigate the effect of using model essays on the development of writing proficiency of iranian pre-intermediate efl learners. to fulfill the purpose of the study, 55 pre- intermediate learners of parsa language institute were chosen by means of administering proficiency test. based on the results of the pretest, two matched groups, one as the expe...

ژورنال: آبخیزداری ایران 2019

Ground waters are considered as substantial water resources in many parts of the world especially in arid and semi-arid area such as Iran. The population growth, the intensive use ofsurface water and groundwater resources has often affected ground water levels. To meeting water management objectives it is essential to have a comprehensive study on the aquifer recharge and ground water withdrawa...

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