نتایج جستجو برای: during three period of flood occurrence before

تعداد نتایج: 21366069  

The impacts of climate Change, more than being influenced by the change in precipitation amount, is affected by the changes imposed by this phenomenon on rainfall regime (intensity and frequency); it means that climate change can cause extensive droughts/floods due to impact on temporal and spatial rainfall distribution, and hence, conducting some studies on return period of extreme rainfalls s...

A. Asghari E. Taghvaye Salimi V. Gholami,

Rivers are important water resources for human life, but sometimes cause irreparable damages. The flood plains are fertile terrains which are endangered by flood. Flood hazard mapping is one of the basic methods in flood fighting. In order to decline flood damages, the simulation of the hydraulic behavior of the rivers during flood occurrence is very important. In this study, areas that are flo...

Journal: :مرتع و آبخیزداری 0
بیتا شیروی دانشجوی کارشناسی ارشد آبخیزداری، دانشکدة منابع طبیعی و محیط زیست دانشگاه فردوسی مشهد علی گلکاریان استادیار دانشکدة منابع طبیعی و محیط زیست دانشگاه فردوسی مشهد علی ابوطالبی پیرنعیمی کارشناس ارشد زمین‏شناسی، دانشکدة منابع طبیعی و محیط زیست دانشگاه فردوسی مشهد

check dams, are small dams in the watershed. these dams are constructed in susceptible areas to erosion due to reduce of flow velocity and erosion, control of sediment and flood in upstream of reservoir dams. these structures are made using wood, stone and cement, and gabion. these structures change the hydrological response of the watershed by reducing flow velocity, the channel slope and stor...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده تربیت بدنی علوم ورزشی 1390

this research was conducted to examine the effect of a concurrent training on rest level of leptin of plasma and some hormonal factors in non-athlete subjects. the research population included non-athlete men who didn’t participate in any organized sport activities. 30 men were chosen voluntarily among the above-mentioned population and were divided into 2 groups: experimental (15 subjects) an...

Journal: :پژوهش های جغرافیای طبیعی 0
پرویز رضایی

the main aim of the current paper is to discuss the important effective variables, particularly synoptic patterns, in creating flood in masoule basin using flood discharge data in komadoul station during 20 year period (1984-2003). to achieve the aim, daily average and instantaneous maximum of discharge in mentioned station were used. data accuracy was done using the data for chomesghal station...

Ali Hoseinian Dariush Karami Chemeh Elaeh Hoseinian Seyed Mahmoud Kashefipour,

Constructing of control structures, like dams, change temporal and spatial unequal distribution of water ,and also play an effective role in reduce or eliminate of damage that caused by floods. So reservoir dam’s effect on floods discharges reduction must be determined. In this study the rain Information and flood hydrographs were used to check the flood routing for previous period of Maroon da...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده زبانهای خارجی 1388

this study investigated the potential role of age in inductive and deductive grammar learning among iranian foreign language learners. the experimental population consisted of our randomly selected samples including two groups of children (with age of exposure to english within 8-13), and two groups of adults (with age of exposure to english within 11-13). thus, the comparison was between ch...

2016
Lionel R. Hertzog Anne Ebeling Sebastian T. Meyer Nico Eisenhauer Christine Fischer Anke Hildebrandt Cameron Wagg Wolfgang W. Weisser

Climate change is projected to increase the frequency of extreme events, such as flooding and droughts, which are anticipated to have negative effects on the biodiversity of primary producers and consequently the associated consumer communities. Here we assessed the effects of an extreme early summer flooding event in 2013 on ant colonies along an experimental gradient of plant species richness...

Spatio-temporal variations of factors affecting the occurrence of precipitation can lead to a change in its amount. The atmospheric moisture is one of the most important factors for precipitation formation. In this study, changes in atmospheric moisture and its relation with occurrence of seasonal wet and dry periods were investigated in Iran. The re-analysis data from the ERA interim European ...

Lack of precipitation and it`s result water deficit is one of the most important problems in arid and semi-arid regions. Developing of (RWH) can be used as a method of increasing cultivation, play a significant role. (RWH) methods obviate water requirement and due to its properties can decrease flood risk and control sediments. In this article during a statistical analysis, determine effect of ...

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