نتایج جستجو برای: drought index
تعداد نتایج: 424034 فیلتر نتایج به سال:
Global warming has resulted in increasingly frequent and severe drought and/or precipitation events. Severe drought limits crop water availability and impacts agricultural productivity and socioeconomic development. To quantify drought-induced yield loss during the main crop stages in Liaoning province, China, aspects of drought episodes (magnitude, duration, and frequency) were investigated du...
In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: s u m m a r y Current drought information is based on indices that do not capture the joint behaviors of hydrologic variable...
Drought is a natural disaster that has impacts on society, the environment, and ecosystem. Ethiopia faced many horrible severe drought events in last few decades. Even though there are some drought-related studies country, most of investigations were focused meteorological analysis. This study was hydrological analysis using streamflow index (SDI). The main objective to identify drought-prone a...
Investigation of changes in groundwater resources is of great importance in planning and sustainable management of water resources. Knowledge on the relationship between groundwater and drought is prerequisite for water resources management. In this study, climatic variables including evaporation, temperature, precipitation as well as hydrological variables i.e. discharge and groundwater depth ...
بررسی و مقایسه دوره های خشکسالی با استفاده از نمایه های مبتنی بر بارش در برخی مناطق مرکزی و غرب کشور
In this study, to evaluate and comparing of drought and wet occurrences, Annual rainfall data related to a 60-year period were used for Kermanshah, Kordestan, Kerman and Yazd provinces. Among the different drought indices, the precipitation-based indices such as, Standardized Precipitation Index (SPI), Percent of Normal Precipitation Index (PNPI), Z-Score Index (ZSI) and Nitzche model were used...
Drought phenomenon with different goals including planning, water sources management and dealing with the problems due to water shortage has been investigated by most scholars. This research examined the relationship between drought and the normalized difference vegetation index (NDVI)in Qorveh and Dehgolan region in Kurdistan, Iran. To determine years with meteorological drought, index of Stan...
The Ningxia Hui Autonomous Region of China (Ningxia) is an important food production area in northwest China severely affected by drought. The Standardized Precipitation Index (SPI) and Standardized Precipitation Evapotranspiration Index (SPEI) were calculated based on monthly meteorological data to explore climate change and variation in drought intensity, duration, frequency, and spatial exte...
Drought is a complex natural hazard that is best characterized by multiple climatological and hydrological parameters. Improving our understanding of the relationships between these parameters is necessary to reduce the impacts of drought. Data mining is a recently developed technique that can be used to interact with large databases and assist in the discovery of associations between drought a...
in order to evaluate of drought tolerance in different canola varieties based on stress evaluation indices in terminal growth duration, an experiment was conducted as split-plot design on randomized complete block design with four replications at experimental field of seed and plant improvement institute, karaj in 2005 and 2006. results using stress susceptibility index (ssi) and tolerance inde...
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