نتایج جستجو برای: amount of rainfall

تعداد نتایج: 21168063  

2006
T. A. Buishand C. Zhou

We consider daily rainfall observations at 32 stations in the province of North Holland (The Netherlands) during 30 years. Let Q be the total rainfall in this area on one day. An important question is: what is the amount of rainfall Q that is exceeded once in 100 years? This is clearly a problem belonging to extreme value theory. Also it is a genuinely spatial problem. Recently, a theory of ext...

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...

Extended abstract Introduction The present study was performed to investigate the effects of slope percentage and land use type on the produced sediment by an artificial rainfall simulator in Kakasharaf watershed, a branch of Karkhe watershed (Lorestan province).   Methodology The rainfall simulator used in this research was designed and constructed by the Soil Conservation and...

2013
Xin Yang Zhanyu Yao Zhanqing Li Tianyi Fan

Time series of rainfall, thunderstorms, temperatures, winds and aerosols of 50 years have been analyzed at the Xian valley (1951–2005, rain rates data are only available for the period of 1961–2000 for Xian) and the nearby Mount Hua (1951–2005) in central China, for assessing the impact of the increasing air pollution on convective precipitation. Adding aerosols to pristine air initially increa...

2016
Eva M. Niedermeyer Matthew Forrest Britta Beckmann Andreas Mulch

Various studies have demonstrated that the stable hydrogen isotopic composition (dD) of terrestrial leaf waxes tracks that of precipitation (dDprecip) both spatially across climate gradients and over a range of different timescales. Yet, reconstructed estimates of dDprecip and corresponding rainfall typically remain largely qualitative, due mainly to uncertainties in plant ecosystem net fractio...

2000
Gregory E. Tucker Rafael L. Bras

We develop a simple stochastic theory for erosion and sediment transport, based on the Poisson pulse rainfall model, in order to analyze how variability in rainfall and runoff influences drainage basin evolution. Two cases are considered: sediment transport by runoff in rills and channels and particle detachment from bedrock or cohesive soils. Analytical and numerical results show that under so...

پایان نامه :0 1374

having conducted the experiment and analysed the data, the researcher computed the groups mean scores and variances for the test relating to the research question. as the final atep, a t-test was conodonted for the hypothesis. as noted earlier, the significance level was determined at .05 and .01 respectively. the observed t-value was higher than the critical t-value at. 5 and .01 levels. conse...

2014
P. R. Lekshmy M. Midhun R. Ramesh R. A. Jani

Oxygen isotopic variations in rainfall proxies such as tree rings and cave calcites from South and East Asia have been used to reconstruct past monsoon variability, mainly through the amount effect: the observed (18)O depletion of rain with increasing amount, manifested as a negative correlation of the monthly amount of tropical rain with its δ(18)O, both measured at the same station. This rela...

2006
SERGEY KIRSHNER PADHRAIC SMYTH STEPHEN P. CHARLES BRYSON C. BATES

Daily rainfall occurrence and amount at 11 stations over North Queensland are examined for summers 1958– 1998, using a Hidden Markov Model (HMM). Daily rainfall variability is described in terms of the occurrence of five discrete ‘weather states’, identified by the HMM. Three states are characterized respectively by very wet, moderately wet, and dry conditions at most stations; two states have ...

2005
C. BATES

Daily rainfall occurrence and amount at 11 stations over North Queensland are examined during summer 1958–1998, using a Hidden Markov Model (HMM). Daily rainfall variability is described in terms of the occurrence of five discrete “weather states,” identified by the HMM. Three states are characterized respectively by very wet, moderately wet, and dry conditions at most stations; two states have...

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