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 39 for “"flood frequency"”.
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Improving flood frequency analysis by integration of empirical and probabilistic regional envelope curves
Flood design necessitates discharge estimates for large recurrence intervals. However, in a flood frequency analysis, the uncertainty of discharge estimates increases with higher recurrence intervals, particularly due to the small number of available flood data. Furthermore, traditional …
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The use of joint probability analysis to predict flood frequency in estuaries and tidal rivers
… influence of river flow, tide and surge on the frequency of extreme water levels in tidal rivers and estuaries. The estimation of flood risk may depend on extreme combinations of these variables rather than individual extreme events, but these relationships are complex and difficult to quantify. …
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Relationships between flood frequency and riparian plant community structure in mountain streams of western Montana
Flooding is the dominant factor structuring riparian plant communities along large, low elevation streams, but it is less clear what role flooding plays in the structure and composition of riparian plant communities along mountain streams. In the first part of this study, I examined the influence …
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Relationships between flood frequency and riparian plant community structure in mountain streams of western Montana
Flooding is the dominant factor structuring riparian plant communities along large, low elevation streams, but it is less clear what role flooding plays in the structure and composition of riparian plant communities along mountain streams. In the first part of this study, I examined the influence …
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Distinguishing flood frequency and magnitude in the morphodynamics and sedimentology of rivers: insights from the South Saskatchewan River, Canada
The impact of a 1 in 40 year flood on the morphology and sedimentology of the sandy braided South Saskatchewan River, Canada was assessed. Comparison of 2004 - 2007 repeat GPR surveys and the production of DEMs of difference allowed quantification of the initial and long-term 2005 flood impact on …
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Zooplankton Species Composition and Diversity in Floodplain Ponds: Effects of Flooding and Local Site Characteristics
… local conditions and physical connection through flooding provides dispersal corridors for inundated pond communities. I explored crustacean zooplankton community composition and diversity in 29 floodplain ponds surrounding Truman Reservoir, Missouri. Topographic features and daily lake level data …
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Previsão de cheias com extensão de registros através de modelos determinísticos
… are strongly influenced by the selected "design flood" value. Thus, a reliable determination of the flood frequency at the project site is one of the most important requirements in its development. The well-known methodology called flood frequency analysis has the inconvenient of limiting the …
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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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Cheias: análise de frequências e regionalização de quantis
… to selecting a mehod that best estimate future flood flow frequencies. By the way, many probability distributions, usually applied in flood frequency analysis, combined with differents parameters estimation methods have been considered. ln order to evaluate the goodness of fit of the functions …
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Application of GIS and Remote Sensing techniques to evaluate the impact of land cover and land use changes on the hydrology and water resources of Luvuvhu River Catchment in Limpopo Province, South Africa.
… expansion was used to quantify land use classes. Flood frequency was analysed using probability distribution methods at recurrence intervals of 2, 5, 10, 20, 25, 50, 100, and 200 years. The FAO CROPWAT software based on Penman-Montheith equation was used to assess the impact of land cover changes …
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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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Probabilistic Flood Risk Assessment Under Climate Change Scenarios in the Humber River Watershed
Flood frequency is expected to increase due to climate change. This research uses the CAPRA method to perform flood risk assessment in the Humber River watershed. The economic and social damages are quantified under current and future climate conditions. First current and future stochastic …
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Mid- to Late Holocene flood reconstruction from two varved sediment profiles of pre-alpine Lake Ammersee (Southern Germany)
… driving force of hydrological extremes like floods and attributing generating mechanisms is an essential prerequisite for understanding past, present, and future flood variability. Successively enhanced radiative forcing under global warming enhances atmospheric water-holding capacity and is …
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A small look at the big picture: linking geopotential height anomalies to paleofloods on the Snake River, Idaho and Oregon
<p>A combined paleoflood and flood hydroclimatology study on the Snake River 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 …
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Stormwater Treatment by Two Retrofit Infiltration Practices
… peak flow rates, storm-flow volumes and flood frequency, and degrade water quality through increases in sediment, nutrient, and bacteria concentrations. In response to water quality and quantity issues within the Stroubles Creek watershed, the Town of Blacksburg and Virginia Tech designed …
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Hydrologic Modeling of a Probable Maximum Precipitation Event Using HEC-HMS and GIS Models - A Case Study of Two Watersheds in Southern Virginia-
… hydrographs associated with the Probable Maximum Flood (PMF) at key locations in each of the watersheds. These hydrographs were subsequently used to develop flood inundation maps of the study areas and to characterize sediment transport phenomena in the study reaches under severe flooding …
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Hydrologic simulation of storm water detention storage in an urbanizing flood-plan
Emerging concepts of urban flood control consider the use of storage detention, especially where channel capacities are being overtaxed by urban runoff. Particular problems exist where high rainfall intensities and low topographic relief combine with rapid urban development to produce potential …
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An analysis of hydraulic, environmental and economic impacts of flood polder management at the Elbe River
Flood polders are part of the flood risk management strategy for many lowland rivers. They are used for the controlled storage of flood water so as to lower peak discharges of large floods. Consequently, the flood hazard in adjacent and downstream river reaches is decreased in the case of flood …
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Comparison of Two Potential Streamgage Locations on Scott Creek at Swanton Pacific Ranch, California
… discharge measurement capabilities. A detailed flood frequency analysis was completed using a direct watershed comparison, direct equations developed by Waananen and Crippen, a Log Pearson Type III Frequency Distribution, a regional analysis, and two-station comparisons. Final results indicate a …
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Examining the Effectiveness of Early Warning System for Disaster Management in Tanzania: A Case Study of Management of Floods in Kinondoni Municipality
… past related to climate change has shown that flood frequency has increased leaving people in the flood plains more vulnerable. People in the river/stream bank due to lack/inadequate of EWS and also due to the inefficiency of the prevailing system they are more prone to stresses and burden in …
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