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 16 of 16 for “"Extreme Floods"”.
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Frequency analysis and two-dimensional simulations of extreme floods on a large watershed
Estimates of extreme floods and probabilities are needed in hydrologic engineering and in risk analysis to assess the safety of dams. This research focuses on developing a two-dimensional, distributed model to simulate extreme floods with return periods up to 10,000 years. The four objectives of …
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Vulnerability of What? Vulnerability of Whom? : evaluating and communicating vulnerability to extreme floods in Houston, TX using a novel web-based platform
… conditions. The particularly devastating extreme storm season experienced in 2017-18 on the east coast of the United States (including storms Harvey, Irma, Maria, and four nor'easters on the mid-Atlantic coast) has intensified discussion regarding the preparation for, response to, and …
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Exploring Long-Term Flood Variability in the Lower French Broad River Using Fluvial Paleoflood Hydrology
Floods are a natural hazard affecting everyone globally. Extreme floods, defined here as floods with an annual exceedance probability ≤ 0.001, are underrepresented in streamflow records. This research aims to reconstruct past flood events from flood deposits and examine flood variability over …
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The Seasonality and Climate Predictability of the Frequency of Extreme Flood Events Across the Contiguous United States
… investigates the seasonality of the frequency of extreme flood events across the United States (US) and outlines the impact of large-scale climate on its spatio-temporal variability. The analysis was conducted on 317 stream gages from the United States Geological Survey (USGS) Hydro-Climatic Data …
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Extreme rainfall, flood scaling and flood policy options in the United States
… the various scaling aspects of rainfall and floods, little theoretical work has been done on the relation between the scaling of rainfall and flood. If available, such a theory would provide frequency estimate for extreme rainfall and floods outside the range of observations and could also be …
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A small look at the big picture: linking geopotential height anomalies to paleofloods on the Snake River, Idaho and Oregon
… in Idaho and Oregon suggests a link between floods and patters of geopotential height anomalies over the North Pacific Ocean. Examination of the paleoflood record in two 4-m (12 ft) tall terraces along the Hells Canyon reach of the Snake River in Idaho and Oregon shows evidence of at least …
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A meta-analysis of Holocene fluvial activity in the Southeastern U.S.
… of short, discontinuous stream gauge records. Extreme flood events captured in the instrumental record often represent outliers, however, paleorecords reveal these extreme floods are not as uncommon as indicated by the gauge record. This thesis used radiocarbon-dated alluvial units from …
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On a New Framework for Detecting, Classifying, and Forecasting Floods for Large-scale Flood Risk Analysis
… as climate changes have increased the chance of extreme weather events. Given the significant, damaging impacts of extreme floods, the ability to effectively model floods is crucial for risk management and mitigation of the impacts of these extreme flooding events. This dissertation presents a …
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Combined abutment and contraction scour in compound channels for extreme flood events
… the scour mechanisms and scour patterns for extreme floods. Close-toreality scour events were physically simulated using models built at 1:45 and 1:30 geometric scales of two-lane bridge prototypes. Scour and flow-measurement experiments under submerged orifice and overtopping flows were …
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Modelling of environmental change impacts on water resources and hydrological extremes in Germany
… estimating future high flows and, in particular, extreme floods remain high due to different RCM structures, emission scenarios and multi-realizations. In contrast, the projection of low flows under warmer climate conditions appears to be more pronounced and consistent. The largest source of …
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Lacustrine Turbidites from Tropical African Lakes as Indicators of Hydrologic and Climatic Changes
… by hyperpycnal river flows during exceptional floods. Time series of turbidite bed-thickness and accumulation rate were generated and compared with regional paleohydrologic records of tropical East Africa, and it is found that the temporal occurrence of the turbidites is climatically …
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Analysis of flood hazard under consideration of dike breaches
… flood events, dikes may fail under the load of extreme water levels and long flood durations. Hazard and risk assessments for river reaches protected by dikes have not adequately considered the fluvial inundation processes up to now. Particularly, the processes of dike failures and their …
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Landscape and environmental changes at Memphis during the dynastic period in Egypt
… Period and the beginning of the Middle Kingdom extreme floods significantly affected the settlement. It recovered during the Middle Kingdom when large-scale landscape management initiatives and strong interventions on the margins of the Central Channel were undertaken. By the New Kingdom, the …
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Detection of long-range dependence : applications in climatology and hydrology
… waves that lead to food shortage, or the other extreme, floods that lead to severe damage. To prevent such catastrophic events, it is necessary to understand, and to be capable of characterising, nature's variability. Typically one aims to describe the underlying dynamics of geophysical records …
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A 7000 yr runoff chronology from varved sediments of Lake Mondsee (Upper Austria)
… potential increase in frequency and magnitude of extreme floods is currently discussed in terms of global warming and the intensification of the hydrological cycle. The profound knowledge of past natural variability of floods is of utmost importance in order to assess flood risk for the future. …
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Extreme weather disaster resilient port and waterway infrastructure for sustainable global supply chain
… and coastal community impact by these extreme weather disasters are the major motivation of this research. The objectives of this research are: (1) modeling shipping demand and level of service, (2) developing Landsat-8 satellite imagery based methodology for mapping surface types and …