نتایج جستجو برای: rainfall and water resources nowadays

تعداد نتایج: 16951225  

2009
Seyed Hamed Alemohammad Reza Ardakanian Akbar Karimi

Predicting future probable values of model parameters, is an essential pre-requisite for assessing model decision reliability in an uncertain environment. Scenario Analysis is a methodology for modelling uncertainty in water resources management modelling. Uncertainty if not considered appropriately in decision making will decrease reliability of decisions, especially in long-term planning. One...

2008
James C.Y. Guo

Hydrologic Engineering, April __________________________________________________________________________________ DESIGN RAINFALL CURVE James C.Y. Guo, Professor, Civil Engineering, U. of Colorado at Denver. __________________________________________________________________________ Abstract To design urban storm water infrastructures, hydrologists apply the SCS Type I and II 24-hr rainfall distr...

Performance and control are two important components in any executive activity and their purposes are to correct and improve the functions and reduce wasting resources for better productivity and adoption of appropriate techniques that ultimately lead to the development of programs. Therefore, the present study aimed to simulate underground water flow and investigate the effects of artificial ...

2009
Casey Brown Daniela Domeisen Robyn Meeks Kenneth Hunu Winston Yu

Recent econometric studies provide evidence that climate variability in general, and rainfall variability in particular, has a negative effect on economic growth in the countries of Sub-Saharan Africa. In this study, we explore the factors that may explain why some countries are more resilient to climate variability than others. We use a range of data that is representative of the possible sour...

Rivers play an important role in the economy and agriculture, but climate change and improper management have affected these resources. In order to better manage rivers, it is necessary to know their discharge trend and the factors that create the trend. The severe decrease in rainfall and the resulting dry periods have many negative effects on water resources. The continuation of droughts is a...

2017
Wenjuan Hua Chuanhai Wang Gang Chen Hai Yang Yue Zhai

Variation in soil water content in the delta plain has its own particularity and is significant for agricultural improvement, the utilization of water resources and flood risk mitigation. In this study, experimental data collected from a plot of farmland located in the Taihu Basin were used to investigate the temporal and vertical variation of soil water content, as well as the effects of indiv...

پایان نامه :وزارت بهداشت، درمان و آموزش پزشکی - دانشگاه علوم پزشکی و خدمات بهداشتی درمانی مشهد - دانشکده دندانپزشکی 1390

objective: the objective of this study was to investigate the invitro fluoride release of four new self-adhesive resin cements; set (sdi, australia), breeze (pentron, usa), embrace wetbond (pulpdent, usa), g-cem (gc, japan) and to assess the bonding performance of these self-adhesive resin cements for bonding of orthodontic brackets. materials and methods: for fluoride release experiment, six ...

ژورنال: علوم آب و خاک 2007
علیرضا توکلی, , علیرضا سپاسخواه, , ابوالفضل عزیزیان, , منصور زیبایی, ,

Irrigation water Scarcity is the major limiting factor for crop production in irrigated farming. Therefore, optimal use of water is influenced by seasonal rainfall especially where the water price is high. Nitrogen also plays a key role in plant nutrition. In this study, wheat grain yield production as a function of applied water (irrigation plus seasonal rainfall) and nitrogen fertilizer (appl...

Journal: Desert 2009
A. Ahmadi M. Fallahi M. Karamouz S. Nazif

Flood is one of the most calamitous natural disasters that causes extensive property and life damages across theworld. It however, could be a blessing due to its special natural water resources recharging value. By simulating themagnitude of probable floods considering the anthropogenic and natural effects and implementing contingency plans,their damages could be reduced. In this paper, the Gen...

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