نتایج جستجو برای: spei

تعداد نتایج: 542  

ژورنال: :مدیریت بیابان 0
کاظم نصرتی محسن محسنی ساروی رضا شهبازی

تاثیرپذیری خشکسالی از شرایط گوناگون اقلیمی، مانعی برای تعریف روشن و جامعی از آن شده است. برای پایش خشکسالی شاخص های گوناگونی در مقیاس های متفاوت زمانی ماهانه و سالانه مورد استفاده قرار گرفته است. از محدودیت های شاخص های رایج همچون شاخص بارش استاندارد شده (spi)[1] عدم در نظرگرفتن بیلان آب بر پایه مقدار تبخیر و تعرق می باشد. شاخص بارش- تبخیر و تعرق استاندارد شده (spei)[2] بر پایه بارش و تبخیر و ت...

ژورنال: مرتع 2021

Drought as a complex ecosystem crisis can affect vegetation density and health. Iran with an arid and semi-arid climate is exposed to this phenomenon. Therefore, it is necessary to evaluate the effect of drought on vegetation. The purpose of this study is to evaluate the effect of meteorological drought on vegetation dynamics in Iran. In this regard, using MATLAB software, SPEI index with time ...

Journal: :Journal of Water and Climate Change 2022

Abstract The Haihe River basin is the main grain production base and highland of economic strategic development in China. Based on daily meteorological data during 1960–2020, characteristics drought evolution were analyzed by standardized precipitation evapotranspiration index (SPEI). Pearson correlation method cross-wavelet analysis used to explore between SPEI climate factors (global warming,...

2012
Rosario Morales-Espinosa Gloria Soberón-Chávez Gabriela Delgado-Sapién Luisa Sandner-Miranda José L. Méndez Gerardo González-Valencia Alejandro Cravioto

Various genomic islands, PAPI-1, PAPI-2, PAGI-1, PAGI-2, PAGI-3, and PAGI-4, and the element pKLC102 have been characterized in different P. aeruginosa strains from diverse habitats and geographical locations. Chromosomal DNA macroarray of 100 P. aeruginosa strains isolated from 85 unrelated patients hospitalized in an intensive care unit was created to assess the occurrence of these genomic is...

Journal: :Meteorology and Atmospheric Physics 2022

Abstract One of the negative consequences climate change is also increase in severity, frequency and length droughts appearing Europe. The effects meteorological drought are often substantial, not only for natural environment but humans. Hence, main purpose this research was to determine trends severity occurrence Europe during period 1951–2015 using standardized precipitation index evapotransp...

Journal: :Water 2022

Water supply for drinking and agricultural purposes in semi-arid regions is confronted with severe drought risks, which impact socioeconomic development. However, early forecasting of indices crucial water resource management to implement mitigation measures against its consequences. In this study, we attempt develop an integrated approach forecast the hydrological a zone ensure sustainable agr...

Journal: :Geomatics, Natural Hazards and Risk 2023

Drought monitoring is a complicated issue as it requires multiple meteorological variables to monitor and anticipate drought accurately. Therefore, developing method that enables researchers, data scientists, planners comprehend mitigation policies more accurately essential. In this research, based on the concepts behind calculation of Standardized Precipitation Evapotranspiration Index (SPEI),...

Journal: :Remote Sensing 2022

Drought is an event of shortages in the water supply, whether atmospheric, surface or ground water. Prolonged droughts have negative impacts on ecosystems, agriculture, society, and economy. Although existing drought index products are widely utilized monitoring, coarse spatial resolution greatly limits their applications regional local scales. Machine learning driven by remote sensing observat...

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