نتایج جستجو برای: spei
تعداد نتایج: 542 فیلتر نتایج به سال:
تاثیرپذیری خشکسالی از شرایط گوناگون اقلیمی، مانعی برای تعریف روشن و جامعی از آن شده است. برای پایش خشکسالی شاخصهای گوناگونی در مقیاسهای متفاوت زمانی ماهانه و سالانه مورد استفاده قرار گرفته است. از محدودیتهای شاخصهای رایج همچون شاخص بارش استاندارد شده (SPI)[1] عدم در نظرگرفتن بیلان آب بر پایة مقدار تبخیر و تعرق میباشد. شاخص بارش- تبخیر و تعرق استاندارد شده (SPEI)[2] بر پایة بارش و تبخیر و ت...
داشتن شناخت لازم از اثر الگوهای دورپیوند و پیشبینی آنها خصوصاً در دورههای خشکسالی، کمک بهسزایی در جهت برنامهریزی دقیقتر در حوضة آبخیز خواهد داشت. هدف تحقیق حاضر، تأثیر الگوهای دورپیوند بر خشکسالی و بارش ایستگاههای همدیدی حوضة دریاچة ارومیه میباشد. در این پژوهش تغییرات بارندگی، تبخیر تعرق و خشکسالی هواشناسی با استفاده از روشهای ناپارامتریک من کندال و شیب سن مورد بررسی قرار گرفت. مطالعة دا...
Quantifying changes in the vulnerability of vegetation to various drought stresses different seasons is important for rational and effective ecological conservation restoration. However, its dynamics a changing environment are still unknown, quantitative attribution analysis has been rarely studied. To this end, study explored characteristics under Xinjiang conducted using random forest method....
Drought is one of the most complex natural phenomena affecting life and livelihood people, especially in current time human-induced climate change. This research employs ground-based observations to assess recent spatiotemporal characteristics meteorological drought events over Rwanda. The examined based on Standardized Precipitation Evapotranspiration Index (SPEI) (SPI) at seasonal annual scal...
Abstract Central Java has a huge population and is the food production area for Indonesia. Due to its geographical complexity human factor, it very vulnerable drought flood hazards. This study aimed analyse events in their impact on economic, environmental, social aspects, as well evaluate multi-hazard management related agriculture. Drought monitoring were conducted by SPI SPEI. Those hazard f...
Comparative analyses of SPI and SPEI as drought assessment tools in Tigray Region, Northern Ethiopia
The Raichur district is considered as a drought prone area in Karnataka. study was carried out to compare and evaluate the performance of six indices namely Standardized precipitation index (SPI), evapotranspiration (SPEI), China Z (CZI), Deciles, Percent Normal (PN) Rainfall anamoly (RAI). A time series were compared evaluated using histogram analytical hierarchy process (AHP). showed that PN,...
We propose a Bayesian model which produces probabilistic reconstructions of hydroclimatic variability in Queensland Australia. The provides standardized approach to hydroclimate reconstruction using multiple palaeoclimate proxy records derived from natural archives such as speleothems, ice cores and tree rings. method combines time-series modeling with inverse prediction quantify the relationsh...
A large part of the population and economic activities South America are located in eastern regions continent, where extreme climate events a recurrent phenomenon. This study identifies characterizes dry wet periods at domain-scale occurring over (ESA) during 1980–2018 through multi-scalar Standardized Precipitation–Evapotranspiration Index (SPEI). For this study, spatial extent ESA was defined...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید