نتایج جستجو برای: irrigation network

تعداد نتایج: 713500  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید چمران اهواز - دانشکده علوم 1388

اطلاعات و پارامترهای موجود در شبکه های آبیاری و زهکشی بواسطه وجود جنبه های مختلف فنی ، مدیریتی ، اجتماعی و اقتصادی از گستردگی بسیار زیادی برخوردار بوده و مدیران با حجم وسیعی از اطلاعات مواجه می باشند. از آنجا که قسمت عمده ای از تصمیمات اتخاذ شده توسط مدیران و برنامه ریزان به نوعی به مکان و موقعیتی خاص مربوط می باشد و در واقع ماهیتی مکان مرجع دارد ، لذا وجود اطلاعات جغرافیائی دقیق و مطمئن و به...

2012
Ahmed Mohsen

The improvement of irrigation systems in the Nile Delta is one of the most important attempts in Egypt to implement more effective irrigation technology by improving the existing irrigation networks. Demand delivery system in the existing irrigation network is using of mechanical gates structures to automatically divert water from one portion of an agricultural field to another in the desired a...

Journal: :journal of hydraulic structures 2014
mina sadat seyedjavad mahmoud mashaal aliasghar montazar

measuring sensitivity of hydraulic structures is considered as an approach for evaluation of water projects performance, due to lower distribution efficiency in irrigation and drainage project schemes. sensitivity analysis approach for irrigation structures is one of flow analysis methods which are developed in recent years in order to measure the behavior of flow in hydraulic structures in an ...

ژورنال: علوم آب و خاک 2018

The irrigation and drainage network of Zarrinehroud with an area of 65,000 hectares is the most important network of Lake Urmia basin, with the direct link to the lake. With the current crisis in the lake, an assessment of the existing network's performance is essential in the Urmia Lake Rescue Program. The purpose of this study was, therefore, to evaluate the transmission, distribution, and ut...

2013
R. Usman

Irrigation systems are as old as man itself since agriculture is the foremost occupation of civilized humanity. To irrigate large areas of plants is an onerous job. In order to overcome this problem many irrigation scheduling techniques have been developed which are mainly based on monitoring the soil, crop and weather conditions. Irrigation scheduling engrosses when to irrigate and how much wa...

Aliasghar Montazar Mahmoud Mashaal Mina Sadat Seyedjavad

Measuring sensitivity of hydraulic structures is considered as an approach for evaluation of water projects performance, due to lower distribution efficiency in Irrigation and Drainage project schemes. Sensitivity analysis approach for irrigation structures is one of flow analysis methods which are developed in recent years in order to measure the behavior of flow in hydraulic structures in an ...

2010
Xinjian Xiang

To improve agricultural water resources’ utilization, crop’s automatic, locate, time and appropriate drip irrigation is a good choice. In this paper, an automatic control drip irrigation system based on ZigBee wireless sensor network and fuzzy control would be introduced. System uses CC2430 for wireless sensor network node design, collecting soil moisture, temperature and light intensity inform...

Journal: :پژوهش آب در کشاورزی 0
پوریا عطائی دانشجوی دکتری ترویج کشاورزی دانشگاه تربیت مدرس. نسیم ایزدی دانشجوی دکتری ترویج و آموزش کشاورزی دانشگاه بوعلی سینا.

irrigation management transfer to farmers is one of the important and necessary issues for irrigation planners globally. irrigation management transfer or participatory irrigation management by water users’ associations (wua) is a widespread strategy in the world and a good way to remove the country's irrigation and drainage systems problems. the main objective of this research was respons...

2012
Milan Cisty

This chapter deals with the optimal design of the most expensive part of a pressurised irrigation system, i.e., its pipe network. The problem of calculating the optimal pipe size diameters of an irrigation network has attracted the attention of many researchers and designers. During the process of designing an irrigation pipe network, the hydraulic engineer will face the problem of determining ...

Journal: :مدیریت آب و آبیاری 0
میناسادات سیدجواد کارشناس ارشد دانشگاه تهران، پردیس ابوریحان، پاکدشت ، ایران. محمود مشعل دانشیار دانشگاه تهران، پردیس ابوریحان، پاکدشت، ایران

one of the consequences of poor management and operation of irrigation systems, poor water delivery and distribution channels and divisions and consequently improper distribution of water level downstream. the study of simulation and performance evaluation software using hydrodynamic sobek varamin irrigation is done. in order to evaluate the network performance and compare the results of simula...

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