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 28 for “"Recurrence interval"”.
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Impact of Stream Restoration on Flood Attenuation and Channel-Floodplain Exchange During Small Recurrence Interval Storms
… restoration during small and sub annual recurrence interval storms have not been thoroughly studied, nor have cumulative impacts of floodplain restoration on water quality at watershed scales. We used HEC-RAS to perform 1D unsteady simulations on a 2nd-order generic stream from the …
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Floodplain Risk Analysis Using Flood Probability and Annual Exceedance Probability Maps
… the floodplain boundary at a certain recurrence interval as a single line, this approach creates a spatial map that shows the probability of flooding at each point in the floodplain. This flood probability map is a useful tool for visualizing the uncertainty of a floodplain boundary. …
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Laboratory analysis of restrenghtening on simulated faults
… drop increases with the logarithm of earthquake recurrence interval (1-5 MPa per decade time). If stress drop is taken as a proxy for fault strength, then the data suggest that faults restrengthen during the quiescent period of the earthquake cycle. Seismic surveys across natural faults show that …
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Improving flood frequency analysis by integration of empirical and probabilistic regional envelope curves
… 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 distribution …
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Evaluation of Scan Methods Used in the Monitoring of Public Health Surveillance Data
… on the latter situation. Metrics such as the recurrence interval and time-to-signal measures are therefore the most applicable. These metrics, in conjunction with control charts such as exponentially weighted moving average (EWMA) charts and cumulative sum (CUSUM) charts, are examined. Two new …
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Adaptive Threshold Method for Monitoring Rates in Public Health Surveillance
… of the W2r method designed using an empiric recurrence interval (RI) in this dissertation research. An adaptive threshold monitoring method is introduced based on fitting sample data to the underlying distributions, then converting the current value to a Z-score through a p-value. We compare …
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Vegetation patterns along the Middle Fork of the Flathead River, Glacier National Park, Montana
… between 1000 and 15000 cfs (which correspond to recurrence intervals of < 1 - 2 years) and a fraction of time inundated of 0.45 to 25 percent. The cottonwood cover type was distinguished by flows ranging from 10 to 25 thousand cfs, a recurrence interval of 1 to 10 years, and a fraction of time …
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Improving Reno Earthquake Hazard Assessment Through a Ground-Motion Model Analysis and Paleoseismic Study
… to constrain the fault slip rate and earthquake recurrence interval. The two approaches can be used to conduct more accurate assessments of seismic hazard risk to Reno and facilitate future hazard mitigation.
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Modeling phosphorus transport in surface runoff from agricultural watersheds for nonpoint source pollution assessment
… for ANSWERS. The technique creates an n-year recurrence interval storm with a duration equal to the time of concentration of the watershed. The intensity pattern is simulated on a ten-minute interval using a first-order Markov model with a lognormal distribution. Using a two-year recurrence …
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Modified inverse first-order reliability method (I-FORM) for predicting extreme sea states
… peak period (Tp) values calculated for a given recurrence interval using a set of data based on hindcast simulations or buoy observations over a sufficient period of record. The use of the inverse first-order reliability method (I-FORM) is standard design practice for generating environmental …
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Probabilistic source-to-sink analysis of the provenance of the California paleoriver: implications for the early Eocene paleogeography of western North America
… particular attention to the what magnitude and recurrence interval of riverine discharge is preserved in the Colton-Wasatch Fm. stratigraphy, and consider the effects this has on scaling discharge to the paleo-catchment area of the system. We develop new scaling relationships between discharge …
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Paleoseismologic Evidence for Holocene Activity on the Pinto Mountain Fault, Twentynine Palms, California
… fault between 3.5-13.6 ka B.P.. The average recurrence interval since 13.3-13.6 ka B.P. is 1510-1680 years, and 1200-1500 years in the last 8.3-9.4 ka B.P.. Geomorphic evidence from offset streams southeast of Donnell Hill and offset gravel bars south and east of the Oasis of Mara suggests …
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Channel-forming discharge and river meander migration modeling of the Pilcomayo River in the area of Misión La Paz (Argentina) and Pozo Hondo (Paraguay)
… whereas the effective discharge has 1.01\yrs of recurrence interval. Further analysis of the bankfull stage conditions are recommended. The RVR Meander results are compared with river centerline planform variations obtained from LANDSAT imagery for the period between 1987 and 2015. RVR Meander …
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Rational Procedure for Damage Based Serviceability Design of Steel Buildings Under Wind Loads and a Simple Linear Response History Procedure for Building Codes
… serviceability, including selecting the mean recurrence interval (MRI), mathematical modeling of the structure, and establishment of rational deformation limits. Chapter 3 contains a journal article submitted to Engineering Journal which describes the recommended procedure for damage based …
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Comparison of Two Potential Streamgage Locations on Scott Creek at Swanton Pacific Ranch, California
… comparisons. Final results indicate a 100-year recurrence interval of 6,310 ft3/s at the Upper Scott Creek location and 6,520 ft3/s at the lower location. A detailed indirect measurement revealed that the Lower Scott Creek gage location can only maintain a discharge of 2,500 ft3/s, or a 10-year …
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Development of a regional curve to relate discharge and drainage area to hydraulic geometry for the Red River of the North Basin
… gage sites in the Red River of the North Basin. Recurrence intervals for bankfull ranged from 1.2 to 1.6 years, with an average recurrence interval of 1.4. Discharge and drainage area data were then plotted in groupings using Level III ecoregions (Omernik et al 1998), watershed accounting unit …
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Soil burn severity and climatic analysis of post-wildfire soil hydraulic properties from across the western continental United States
… duration rainfall intensity for a 2-year recurrence interval storm, and pre-wildfire soil moisture. Better understanding of how post-wildfire infiltration behavior relates to regional climatic variables and burn conditions will be valuable in post-wildfire hazard prediction and modeling …
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Beaver as drivers of hydrogeomorphic and ecological processes in a mountain valley
… valley and for a longer duration than a 10-year recurrence-interval flood. Most importantly, the primary hydrologic effects occurred downstream of the dams rather than being confined to the near-pond area. The dams attenuated the expected water table decline in the drier summer months for 9 and …
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Characterization of fluvial facies distributions and cyclicity using terrestrial lidar: Paleocene Nacimiento Formation, Kutz Canyon, New Mexico
… at 6.5 m over a vertical thickness of 25 m. The recurrence interval of this signal is estimated to be approximately 34 kya and is interpreted as depositional products of successive avulsion episodes, or depositional lobe switching on a distributive fluvial system. Trenching through the weathering …
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Prelude to the Tshirege caldera-forming eruption of the Bandelier magmatic system, New Mexico, USA
… following caldera collapse the average eruption recurrence interval is ~ 1.4 ± 1.1 kyr. For the next 239.8 ± 34.5 kyr, eruption frequency decreased to an average recurrence of 8.0 ± 1.2 kyr between events. The decrease in activity concluded in a hiatus of 117 ± 32 kyr that ended at 1240.5 ± 2.1 …
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