نتایج جستجو برای: monthly rainfall

تعداد نتایج: 62739  

2010
Douglas W. Burbank

7 The hydrological budget of Himalayan rivers is dominated by monsoonal rainfall and 8 snowmelt, but their relative impact is not well established. Current knowledge of rainfall and 9 snow-cover distribution is unreliable because this remote region lacks a dense gauge network. 10 Here, we use a combination of remotely-sensed climate parameters that have been both 11 calibrated and validated to ...

2005
Barnabas Akurigo AMISIGO

The 400,000 km Volta Basin is an international basin covering almost 28% of the West Coast. Basin of Africa. It extends from longitude 5 30 W to 2 00E and from latitude 5 30 N to 14 30 N and is shared by the six West African countries Benin, Togo, Ghana, La Cote d’Ivoire, Burkina Faso and Mali. The water resources of this basin are under severe stress due to both human and natural causes. High ...

2014
E. T. Taylor I. S. Kamara A. Bockarie Sierra Leone

Introduction and Purpose: It is now apparent that the changing weather patterns are associated with climate change according to the UN Intergovernmental Panel on Climate Change. In the wake of relatively little work looking at rainfall pattern in tropical countries of developing nations, especially in Sierra Leone, we conducted a retrospective analysis on the amount of rainfall over the past fe...

2014
Ross I. Maidment David Grimes Richard P. Allan Marc Stringer Tim Hewison Rob Roebeling Emily Black

African societies are dependent on rainfall for agricultural and other water-dependent activities, yet rainfall is extremely variable in both space and time and reoccurring water shocks, such as drought, can have considerable social and economic impacts. To help improve our knowledge of the rainfall climate, we have constructed a 30 year (1983–2012), temporally consistent rainfall data set for ...

2017
Ross I. Maidment David Grimes Richard P. Allan Marc Stringer Tim Hewison Rob Roebeling Emily Black

African societies are dependent on rainfall for agricultural and other water-dependent activities, yet rainfall is extremely variable in both space and time and reoccurring water shocks, such as drought, can have considerable social and economic impacts. To help improve our knowledge of the rainfall climate, we have constructed a 30 year (1983–2012), temporally consistent rainfall data set for ...

Journal: :آب و خاک 0
وجیهه محمدی ثابت محمد موسوی بایگی حجت رضائی پژند

introduction: the southern oscillation is a large scale phenomenon that changes the normal oscillating air pressure on both sides of the pacific ocean. it disrupted the normal conditions and the patterns of temperature and precipitation change in the nearby region and other regions of the world. this phenomenon is caused by changing the water slope in the pacific ocean between peru (northwester...

Journal: :پژوهش های جغرافیای طبیعی 0
محمدتقی ستاری استادیار گروه مهندسی آب، دانشکدۀ کشاورزی، دانشگاه تبریز علی رضازاده جودی دانشجوی کارشناسی ارشد عمران آب، دانشگاه آزاد اسلامی، واحد مراغه فرناز نهرین دانشجوی کارشناسی ارشد سازه‎های آبی، دانشکدۀ کشاورزی، دانشگاه تبریز

introduction rainfall is considered as one of the most important factures in water cycle. prediction of monthly rainfall is important for many purposes such as estimating torrent, drought, run-off, sediment, irrigation programming and also management of drainage basins. rainfall prediction in each area is mediated by punctual data measured as humidity, temperature, wind speed and etc. as iran i...

Journal: :international journal of environmental research 2015
r. p. rudra w. t. dickinson s. i. ahmed p. patel j. zhou

there is a general consensus that climate change has impact on the intensity and frequency of rainfall events. however, very little research is available about the changes in short term rainfall extremes. the focus of this paper has been on the change in annual and monthly rainfall extremes in ontario. the results indicate a greater variability (increase and decrease) among stations for shorter...

2006
Andrew W. Robertson Amor V. M. Ines James W. Hansen

A non-homogeneous hidden Markov model (NHMM) is used to make stochastic simulations of March–August daily rainfall at 10 stations over the southeastern United States, 1923–98. Station-average observed daily rainfall is prescribed as an input to the NHMM, which is then used to disaggregate the rainfall in space. These rainfall simulations are then used as inputs to a CERES crop model for maize. ...

2004
Ziad S. Haddad Jonathan P. Meagher Robert F. Adler Eric A. Smith Stephen L. Durden

[1] Numerous studies have documented the effect of El Niño-Southern Oscillation (ENSO) on rainfall in many regions of the globe. The question of whether ENSO is the single most important factor in interannual rainfall variability has received less attention, mostly because the kind of data that would be required to make such an assessment were simply not available. Until 1979 the evidence linki...

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