نتایج جستجو برای: expansion of rain irrigation

تعداد نتایج: 21178589  

Sasanian’s imperial policy aimed to construct new towns, massive irrigation infrastructures, and land modification bydepopulating rural areas in order to carry out massive agriculture projects particularly in Khuzestan. Shushtar with itsancient relics presents a unique chance to investigate some of these development activities, mainly in terms of irrigation.Several chief irrigation organs have ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان 1389

wireless sensor networks (wsns) are one of the most interesting consequences of innovations in different areas of technology including wireless and mobile communications, networking, and sensor design. these networks are considered as a class of wireless networks which are constructed by a set of sensors. a large number of applications have been proposed for wsns. besides having numerous applic...

2014
C. A. Scott

Rising demand for food, fiber, and biofuels drives expanding irrigation withdrawals from surface water and groundwater. Irrigation efficiency and water savings have become watchwords in response to climate-induced hydrological variability, increasing freshwater demand for other uses including ecosystem water needs, and low economic productivity of irrigation compared to most other uses. We iden...

Journal: :E3S web of conferences 2023

In the article, a mathematical model of movement water drop flying out nozzle with deflector during artificial rain was built. The resulting equations were solved by an approximate method using specially developed program at EHM. parameters affecting irrigation process analyzed based on obtained results.

2013
Terence Darlington Mushore

The aim of this article is to explore ways of increasing agricultural productivity in Zimbabwe in the face of the increasingly uncertain climatic conditions. Agriculture has remained crucial to economic growth in Zimbabwe while it is mainly rain-fed. The total seasonal rainfall amounts are not indicating any significant trend (increasing or decreasing) with time. Changes are only noticed in the...

2007
Bridget R. Scanlon Ian Jolly Marios Sophocleous Lu Zhang

[1] Past land use changes have greatly impacted global water resources, with often opposing effects on water quantity and quality. Increases in rain-fed cropland (460%) and pastureland (560%) during the past 300 years from forest and grasslands decreased evapotranspiration and increased recharge (two orders of magnitude) and streamflow (one order of magnitude). However, increased water quantity...

2017
Andreas Reim Marcela Hernández Melanie Klose Amnat Chidthaisong Monthira Yuttitham Ralf Conrad

Rice paddies in central Thailand are flooded either by irrigation (irrigated rice) or by rain (rain-fed rice). The paddy soils and their microbial communities thus experience permanent or arbitrary submergence, respectively. Since methane production depends on anaerobic conditions, we hypothesized that structure and function of the methanogenic microbial communities are different in irrigated a...

ژورنال: :جغرافیا و برنامه ریزی محیطی 0
عبدالمجید محمدی دانشگاه سیستان و بلوچستان بهلول علیجانی دانشگاه تربیت معلم بهلول علیجانی دانشگاه تربیت معلم پیمان محمودی دانشگاه سیستان و بلوچستان عبدالرئوف شاهوزئی مرکز تحقیقات هواشناسی کاربردی استان سیستان و بلوچستان

بارش به عنوان مهمترین عنصر اقلیمی همواره در سرزمین ایران از پیچیدگی های خاصی برخوردار بوده است. این پیچیدگی ها که بیشتر ناشی از موقعیت جغرافیایی این سرزمین پهناور بوده است باعث گردیده است که بارش از توزیع زمانی و مکانی یکنواختی برخوردار نباشد. هدفی که این تحقیق در پی دست یافتن به آن است تعیین تداوم های دو، سه و چهار روزه بارش در ایران زمین و تعیین ساختار احتمالی آن با استفاده از تعیین بهترین مر...

Journal: :Revista Ibero-Americana de Ciências Ambientais 2023

The socioeconomic context brought by the COVID-19 pandemic and war in Ukraine, caused a crisis world economy. Faced with this situation of inflation rise dollar, access to basic items such as water cooking gas has become an obstacle for needy population. There are alternatives overcome scarcity, one them is use harvesting systems low-cost technologies, which facilitate replication environments ...

1998
Raymond Torres William E. Dietrich David R. Montgomery Suzanne P. Anderson Keith Loague

As part of a larger, collaborative study, we conducted field experiments to investigate how rainfall signals propagate through an unsaturated soil profile, leading to a rapid pore pressure response and slope instability. We sprinkler-irrigated an entire, unchanneled headwater basin in the steep, humid Oregon Coast Range, and we drove the system to quasi steady state as indicated by tensiometers...

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