نتایج جستجو برای: ihacres and simhyd rainfall

تعداد نتایج: 16833488  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه کاشان - دانشکده منابع طبیعی 1393

مدل¬سازی فرآیند بارش – رواناب و پیش¬بینی دبی رودخانه، یک اقدام مهم در مدیریت و مهار سیلاب-ها، طراحی سازه¬های آبی در حوزه¬های آبخیز و مدیریت خشکسالی است. رابطه بارش – رواناب، یکی از پیچیده¬ترین فرآیندهای هیدرولوژیکی است که درک آن، از اهمیت زیادی در هیدرولوژی و منابع آب برخوردار است. با توجه به اهمیت چگونگی شکل¬گیری رواناب سطحی در یک حوزه آبریز، ارزیابی روش¬هایی که بتواند هیدروگراف جریان را با در...

خسـروی , محمود , مسعودیان, سیـد ابوالفضل , نظری پـور , حمید ,

Iran is located in dry zone of mid-latitude in which the mean rainfall is 250 mm and it has dramatic tempo-spatial changes. Rainfalls with short persistency are of characteristics of dry regions and it is also tangible in Iran. However, Iran’s rainfalls persistency ranges from 1 to 45 days and have dramatic tempo-spatial changes, but the maximum amount and days of rainfalls are supplied by rain...

Journal: :the international journal of humanities 2005
morteza behzadfar hamid reza moradi seyed hamid reza sadeghi

this study tries to investigate relationship between rainfall parameters and usle r factor. to gain r-factor, at first, shower kinetic energy was calculated and then its erosivity computed by using maximum 30 minutes rainfall intensity. therefore 3 meteorological stations in khuzestan province and one station per kohgiloyeh & boyerahmad and boushehr provinces were selected and their recorde...

Gholamali Mozafari Ismail Nasr Esfahani Mona Moalemi,

The zoning of phenomena based on geographical location has a long history; any geographical zone is a part on ground level, which possesses noticeable internal consistency in terms of its existing phenomena and processes. Agroclimatic zoning is mainly purposed to determine agroclimate regions and to evaluate these zones based on their relative utility in order to cultivate varieties of agricult...

Journal: :تحقیقات جغرافیایی 0
زهره مریانجی هواشناسی سید ابوالفضل مسعودیان دانشگاه اصفهان حسین عساکره علی اکبر سبزی پرور دانشگاه بوعلی سعید موحدی دانشگاه اصفهان

abstract one of the most variability of atmospheric parameter is precipitation, which changes seasonally. it is important to understand exact characteristic of rainfall seasonal variable. therefore, it is avoidable to study rainfall season in hamedan province, because hameden is one of the important centers of agriculture in iran. in this research, the seasonal variability of rainfall is consid...

ژورنال: علوم آب و خاک 2012
حسین بشری, , ربانه روغنی, , سعید سلطانی, ,

Southern Oscillation Index (SOI) and Sea Surface Temperature (SST) patterns affect rainfall in many parts of the world. This study aimed to investigate the relationship between monthly and seasonal rainfall of Iran versus SOI and Pacific and Indian sea surface temperature. Monthly rainfall data, from 50 synoptic stations with at least 30 years of records up to the end of 2007, were used. Monthl...

Gholamali Mozafari Ismail Nasr Esfahani Mona Moalemi,

The zoning of phenomena based on geographical location has a long history; any geographical zone is a part on ground level, which possesses noticeable internal consistency in terms of its existing phenomena and processes. Agroclimatic zoning is mainly purposed to determine agroclimate regions and to evaluate these zones based on their relative utility in order to cultivate varieties of agricult...

Rainfall erosivity is one of the factors determining the amount of water erosion in the soil. Rainfall erosivity is determined by the  total rainstorm energy and the maximum intensity in 30 minutes (I30). Since rainfall erosivity is closely related to the amount and intensity of rainfall, it is expected that the rainfall erosivity would change monthly and seasonally throughout the year. The mai...

Journal: :international journal of agricultural science, research and technology in extension and education systems 2011
shahram karimi-googhari

rainfall and evapotranspiration are the two most popular climatic factors which have crucial function on agricultural production. rainfall can be directly measured easily in an area but evapotranspiration is estimated from weather data. in this study reference evapotranspiration eto was estimated using penman–monteith equation. monthly rainfall and evapotarnspiration were plotted and compared i...

Journal: :international journal of environmental research 0
h. m. rasel department of civil and construction engineering, faculty of science, engineering and technology (fset), swinburne university of technology, melbourne, vic 3122, australia. m. a. imteaz department of civil and construction engineering, faculty of science, engineering and technology (fset), swinburne university of technology, melbourne, vic 3122, australia. f. mekanik department of civil and construction engineering, faculty of science, engineering and technology (fset), swinburne university of technology, melbourne, vic 3122, australia.

australian rainfall is related with numerous key climate predictors namely el-nino southern oscillation (enso), indian ocean dipole (iod) and southern annular mode (sam). some studies have tried to discover the effects of these climate predictors on rainfall variability of different parts of australia, particularly western australia, queensland and victoria. nonetheless, clear association betwe...

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