Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Standardized Precipitation Index (SPI)"”.
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Spatiotemporal Comparison of Drought Metrics over the Western United States
… metrics range from those which only incorporate precipitation anomalies to more comprehensive measures such as the United States Drought Monitor (USDM), which incorporates on-the-ground observations of drought impacts to arrive at a consensus-based drought status. Here, we develop a method to …
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Drought assessment of Pakistan and its impact on its agricultural production
… in studying climatic variables which include precipitation & temperature and their impacts on the crop yield. Crop production with comparison to yield is a more suitable and realistic variable for such an analysis because drought impacts both the crop yield and harvesting area. Agriculture is …
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Hydrological Drought Analysis for Seven North Georgia Watersheds (1970-2000)
<p>Drought is a prolonged reduction in precipitation which may result in significant effects on local ecosystems, watersheds, and water sources, with the potential to have negative impacts on human populations. Normalized indexes can be used to characterize drought magnitudes and frequencies using …
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Influence of climate change on flood and drought cycles and implications on rainy season characteristics in Luvuvhu River Catchment
… 6 and 0766715 5 showed decreasing trends. Standardized precipitation index (SPI) was used to determine floods and droughts cycles. SPI results have been classified either as moderately, severely and extremely dry or, moderately, very and extremely wet. This SPI analysis provides more …
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Observações geodésicas multi-sensores aplicadas para caracterização de secas e monitoramento de massa hidrológica
… a partir do Normalized Difference Vegetation Index (NDVI), volume de água nos 346 reservatórios existentes na região, dados de precipitação a partir de pluviômetros para cálculo do índice de seca Standardized Precipitation Index - SPI . Os resultados confirmam a coesão entre as variações do …
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Potential impacts of climate change on hydrological droughts in the Limpopo river basin
… reduces water availability in river basins. Despite this, most research on climate change effects in southern Africa has focused exclusively on meteorological droughts. This thesis projects the potential effect of climate change on the future characteristics of hydrological droughts in the …
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Hydrometeorological Variability over Pakistan
… regional scale humidity, cloud cover, and precipitation, along with decreased net radiation, near-surface wind speed, potential evapotranspiration and river flow, especially during the summer season, represent a substantial change in the energy, mass and momentum fluxes that are …
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Subseasonal to seasonal prediction and predictability of extreme and severe weather
… weekly frequency of extreme warm days and 14-day standardized precipitation index (SPI) during boreal summer in the United States (US). A leading principal component of US soil moisture and an index based on the North Pacific sea surface temperature are used as predictors. The model outperforms …
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The response of southern African vegetation to droughts in past and future climates
… Unit (CRU), while the simulated vegetation index (i.e. Normalized Difference Vegetation Index, NDVI) were evaluated with NDVI data from the Global Inventory Modelling and Mapping Studies (GIMMS). Meteorological droughts were analyzed at different timescales (1- to 18-month timescales), using …
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Evaluation of future meteorological and hydrological drought in the Rufiji basin
… the study applies three key drought indices—the Standardized Precipitation Index (SPI), the Standardized Precipitation-Evapotranspiration Index (SPEI), and the Streamflow Drought Index (SDI)—to analyze 12-month drought events within the basin. This approach allows for a examination of drought …
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Understanding the characteristics of droughts over Eastern Africa in past and future climates
… study combines rainfall and Potential Evapotranspiration (PET) to examine the characteristics of meteorological and hydrological droughts in present and future climates at the regional and river basin scales. To accomplish that we have applied five objectives; i) Study the temporal and spatial …
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Drought predictions: applications in Australia.
… The effect of climatic variation on Australia's precipitation is examined by investigating the association between climatic indices and the multivariate distribution of drought at numerous sites across Australia. Two classification strategies for forecasting rainfall are compared using …