نتایج جستجو برای: drought duration

تعداد نتایج: 234998  

ژورنال: علوم آب و خاک 2002
کامکار حقیقی, علی ‌اکبر, کریمی, ولی ‌الله, خلیلی, داور , سپاسخواه , علیرضا ,

Drought can occur at such times when variables such as rainfall depth, run-off, soil moisture, etc. show a deficiency, or variables such as temperature show an increase, or when ground water level shows a decrease in comparison with the average level. Therefore, drought can be evaluated with respect to agricultural, meteorological, or hydrological variability. In this research, considering the ...

2011
Dalezios Nicolas Anna Blanta Nicos Spyropoulos Nicholas Pismichos Evangelia Boukouvala

The growing number and effectiveness of earth observation satellite systems, along with the increasing reliability of remote sensing methodologies and techniques, present a wide range of new capabilities in monitoring and assessing droughts. In this paper, several drought features are analyzed and assessed by using remotely sensed Reconnaissance Drought Index (RDI). The developed methodology is...

2018
Yongxin Dai Lin Wang Xianchong Wan

Drought-induced tree mortality has been observed worldwide. Nevertheless, the physiological mechanisms underlying this phenomenon are still being debated. Potted Robinia pseudoacacia and Platycladus orientalis saplings were subjected to drought and their hydraulic failure and carbon starvation responses were studied. They underwent simulated fast drought (FD) and slow drought (SD) until death. ...

2016
Guihua Lu Hongwei Wu Heng Xiao Hai He Zhiyong Wu Xixi Wang

Based on Coupled Model Intercomparison Project Phase 5 (CMIP5) dataset and a variable infiltration capacity (VIC) hydrological model, this study assesses the possible influence of climate change in the upstream region of the Yangtze River on droughts in the future 30 years. Long-term daily soil moisture content were simulated by VIC model at a 50 km × 50 km resolution from 1951 to 2013. Regiona...

کامکار حقیقی, علی ‌اکبر, کریمی, ولی ‌الله, خلیلی, داور , سپاسخواه , علیرضا ,

Drought can occur at such times when variables such as rainfall depth, run-off, soil moisture, etc. show a deficiency, or variables such as temperature show an increase, or when ground water level shows a decrease in comparison with the average level. Therefore, drought can be evaluated with respect to agricultural, meteorological, or hydrological variability. In this research, considering the ...

2017
He Song Yibo Li Li Zhou Zhenzhu Xu Guangsheng Zhou

10 Effects of crop growth and physiological activity to drought and irrigation regimes 11 have been extensively studied; however, the responses of plant growth, morphological 12 and photosynthetic behaviors to drought episodes and thereafter rewatering receive a 13 less attention. This field experiment was carried out directly in situ at an agricultural 14 ecosystem research station during 2015...

2016
Eric Adee Kraig Roozeboom Guillermo R. Balboa Alan Schlegel Ignacio A. Ciampitti

The potential benefit of drought-tolerant (DT) corn (Zea mays L.) hybrids may depend on drought intensity, duration, crop growth stage (timing), and the array of drought tolerance mechanisms present in selected hybrids. We hypothesized that corn hybrids containing DT traits would produce more consistent yields compared to non-DT hybrids in the presence of drought stress. The objective of this s...

Journal: :مدیریت آب و آبیاری 0
مجتبی شفیعی دانشجوی دکتری گروه مهندسی آب، دانشکده کشاورزی، دانشگاه فردوسی مشهد بیژن قهرمان استاد گروه مهندسی آب، دانشکده کشاورزی، دانشگاه فردوسی مشهد حسین انصاری استادیار گروه مهندسی آب، دانشکده کشاورزی، دانشگاه فردوسی مشهد محمد باقر شریفی دانشیار گروه مهندسی عمران، دانشکده مهندسی، دانشگاه فردوسی مشهد

drought is a gradual phenomenon and cause important changes in water resources, agriculture and so on. due to the stochastic behavior of factors that influence the occurrence and intense of drought, one can consider this phenomenon as a stochastic process. with respect to the importance of predicted drought severity and its vital influence in designing and operating water resources systems, thi...

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