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 20 of 54 for “"Extreme rainfall"”.
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The synoptic drivers of extreme rainfall in South Africa
… have shown an increase in the intensity of extreme rainfall over many regions of South Africa during the last 50 to 100 years. However, the weather of a region at any given time is a direct function of the synoptic state of the atmosphere at that particular time. This thesis identifies …
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Extreme rainfall regime characterization in Sardinia using daily rainfall data
… flood is fundamental the knowledge of the ``extreme rainfall regime'' in the area where the hydraulic structures must be set up. Indeed the design flood is commonly evaluated as output of rainfall-runoff models that receive as input the quantitative description of a rainfall extreme event …
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Cut-off low pressure systems and extreme rainfall over South Africa
… flow that leads to these systems producing extreme quantities of rainfall.
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Monsoon surges, tropical cyclones and extreme rainfall events in NW Madagascar
Rainfall variability in NW Madagascar and the kinematics and thermodynamics of flood-producing weather systems affecting the region are examined. Daily rainfall in the austral summer are used to select 16 cases for the composite analysis of flood events in the period 1987-1992. In addition two …
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Extreme rainfall intensities and long-term rainfall risk from tropical cyclones
We develop a methodology for the frequency of extreme rainfall intensities caused by tropical cyclones (TCs) in coastal areas. The mean rainfall field associated with a TC with maximum tangential wind speed Vmax, radius of maximum winds Rmax, and translation speed Vmax, is obtained using a …
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Model post-processing for the extremes: improving forecasts of locally extreme rainfall
… investigates the science of forecasting locally extreme precipitation events over the contiguous United States from a fixed-frequency perspective, as opposed to the traditionally applied fixed-quantity forecasting perspective. Frequencies are expressed in return periods, or recurrence intervals; …
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Capability of CORDEX RCMs in simulating extreme rainfall events over South africa
In South Africa, extreme rainfall events often lead to widespread destruction, damage infrastructure, displace communities, strain water management and even destroy lives. Past studies have shown that reliable predictions of extreme rainfall events from regional climate models (RCMs) could help …
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Future changes in extreme rainfall events and circulation patterns over southern Africa
Changes in precipitation extremes are projected by many global climate models as a response to greenhouse gas increases, and such changes will have significant environmental and social impacts. These impacts are a function of exposure and vulnerability. Hence there is critical need to understand …
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Extreme rainfall, flood scaling and flood policy options in the United States
River flood and rainfall have been shown to exhibit scale invariance behavior over a range of space and time scales. Although various approaches have been taken to investigate and model the various scaling aspects of rainfall and floods, little theoretical work has been done on the relation between …
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Future changes in extreme rainfall events and African easterly waves over West Africa
… between African Easterly Waves (AEWs) and extreme rainfall events over West Africa, and investigates how climate change could alter this relationship in the future. Satellite observations, reanalysis data, and regional climate model (RCA4) simulations (forced with eight global climate …
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Extreme rainfall events over the Pongola-Mtamvuna Water Management Area of South Africa
… southern Africa experiences substantial rainfall variability both spatially and temporally, due to regional orography, geographic position, and local sea-surface temperatures. Extreme weather conditions such as droughts and floods are not uncommon and can result in both positive and …
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Contribution of anthropogenic climate change to the magnitude of extreme rainfall events and associated synoptic conditions during recent flooding in Kenya
The changing probabilities of extreme climate and weather events, in terms of frequency, intensity, spatial extent, duration and timing, are one of the most noticeable and damaging manifestations of human-induced climate change. The Greater Horn of Africa has experienced a number of extreme weather …
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Hydraulic modelling of Chicago Area Waterways System (CAWS) to assess the impact of hydrologic separation on water levels and potential flooding during extreme rainfall events in Chicago, Illinois
An unsteady 1D hydraulic model (HEC—RAS) was implemented for the Chicago Area Waterways System (CAWS) for two configurations: i) current conditions, and i) physical separation with barriers. Hydrologic conditions were those for the 100-year storm event observed in September 2008. Combined Sewer …
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Identification and simulation of extreme precipitation using a computationally inexpensive methodology
An examination of characteristics extreme precipitation in the greater Cape Town region is undertaken. Thereafter, an investigation into the characteristics of these changes is made using two approaches. The first is an empirical methodology to explore the historical attributes of extreme events …
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Analysis of long-term precipitation sequencing patterns in North America
… Precipitation sequencing, which is based on rainfall of all magnitudes, is not well understood in part because much of recent research has focused on changes solely in extreme precipitation. This study examines precipitation sequencing pattern changes in North America over a study period of …
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Geospatial Assessment of Port Infrastructure and Computational Modeling of Coastal Disasters
… Technology (CAIT) methodologies, as well as an extreme rainfall simulation. Case studies involved geospatial mapping of infrastructure planimetrics of selected areas. The planimetric method using the Landsat-8 multispectral satellite imagery, the L-BANS surface classification, and the 2011 …
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Precipitações diárias intensas na cidade de João Pessoa, Paraíba.
… to measure and analyze the intense daily rainfalls and their impacts on urban area in the city of João Pessoa, from 1981-2012. The methodological procedures to reach the proposed objectives were: bibliographical research on the subject, followed by the collection and analysis of data for …
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Quantitative precipitation forecasting (QPF) for surface water flood forecasting
… System (SUDS) and coupled with a real-time extreme rainfall forecasting system, is currently in the design phase in the North Glasgow Area. Critical to the design's success is the integration of extreme rainfall forecasting in a timely manner (design criteria is 24hrs warning) to allow the …
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Long-lived mesoscale convective systems over Eastern South Africa
… global scale, MCSs are not only important as key rainfall producers, but are often responsible for flooding, severe winds, hail and sometimes tornadoes. MCSs in South Africa remain poorly understood with there being little evidence of any long-term climatology studies of these systems over the …
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Urban drainage modeling and evolutionary multiobjective optimization for combined sewer overflows prediction and control
… and climate change appears to contribute to more extreme rainfall events, the stress on urban wastewater systems increases. In particular, urban flooding and river water quality degradation due to combined sewer over flows (CSOs) are prevailing problems in urban areas worldwide. In this study we …
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