Development Of Regional Skews For Selected Flood Durations For The Central Valley Region California Based On Data Through Water Year 2008
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Development Of Regional Skews For Selected Flood Durations For The Central Valley Region California Based On Data Through Water Year 2008
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Author : Jonathan R. Lamontagne
language : en
Publisher: CreateSpace
Release Date : 2014-07-11
Development Of Regional Skews For Selected Flood Durations For The Central Valley Region California Based On Data Through Water Year 2008 written by Jonathan R. Lamontagne and has been published by CreateSpace this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-07-11 with Technology & Engineering categories.
Flood-frequency information is important in the Central Valley region of California because of the high risk of catastrophic flooding. Most traditional flood-frequency studies focus on peak flows, but for the assessment of the adequacy of reservoirs, levees, other flood control structures, sustained flood flow (flood duration) frequency data are needed. This study focuses on rainfall or rain-on-snow floods, rather than the annual maximum, because rain events produce the largest floods in the region. A key to estimating flood-duration frequency is determining the regional skew for such data. Of the 50 sites used in this study to determine regional skew, 28 sites were considered to have little to no significant regulated flows, and for the 22 sites considered significantly regulated, unregulated daily flow data were synthesized by using reservoir storage changes and diversion records. The unregulated, annual maximum rainfall flood flows for selected durations (1-day, 3-day, 7-day, 15-day, and 30-day) for all 50 sites were furnished by the U.S. Army Corps of Engineers. Station skew was determined by using the expected moments algorithm program for fitting the Pearson Type 3 flood-frequency distribution to the logarithms of annual flood-duration data. Bayesian generalized least squares regression procedures used in earlier studies were modified to address problems caused by large cross correlations among concurrent rainfall floods in California and to address the extensive censoring of low outliers at some sites, by using the new expected moments algorithm for fitting the LP3 distribution to rainfall flood-duration data. To properly account for these problems and to develop suitable regional-skew regression models and regression diagnostics, a combination of ordinary least squares, weighted least squares, and Bayesian generalized least squares regressions were adopted. This new methodology determined that a nonlinear model relating regional skew to mean basin elevation was the best model for each flood duration. The regional-skew values ranged from -0.74 for a flood duration of 1-day and a mean basin elevation less than 2,500 feet to values near 0 for a flood duration of 7-days and a mean basin elevation greater than 4,500 feet. This relation between skew and elevation reflects the interaction of snow and rain, which increases with increased elevation. The regional skews are more accurate, and the mean squared errors are less than in the Interagency Advisory Committee on Water Data's National skew map of Bulletin 17B.
Development Of Regional Skews For Selected Flood Durations For The Central Valley Region California Based On Data Through Water Year 2008
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Author : Jonathan R. Lamontagne
language : en
Publisher:
Release Date : 2012
Development Of Regional Skews For Selected Flood Durations For The Central Valley Region California Based On Data Through Water Year 2008 written by Jonathan R. Lamontagne and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Floods categories.
Fundamentals Of Statistical Hydrology
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Author : Mauro Naghettini
language : en
Publisher: Springer
Release Date : 2016-10-26
Fundamentals Of Statistical Hydrology written by Mauro Naghettini and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-10-26 with Science categories.
This textbook covers the main applications of statistical methods in hydrology. It is written for upper undergraduate and graduate students but can be used as a helpful guide for hydrologists, geographers, meteorologists and engineers. The book is very useful for teaching, as it covers the main topics of the subject and contains many worked out examples and proposed exercises. Starting from simple notions of the essential graphical examination of hydrological data, the book gives a complete account of the role that probability considerations must play during modelling, diagnosis of model fit, prediction and evaluating the uncertainty in model predictions, including the essence of Bayesian application in hydrology and statistical methods under nonstationarity. The book also offers a comprehensive and useful discussion on subjective topics, such as the selection of probability distributions suitable for hydrological variables. On a practical level, it explains MS Excel charting and computing capabilities, demonstrates the use of Winbugs free software to solve Monte Carlo Markov Chain (MCMC) simulations, and gives examples of free R code to solve nonstationary models with nonlinear link functions with climate covariates.
Inaugural Section Special Issue
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Author : Deodato Tapete
language : en
Publisher: MDPI
Release Date : 2021-02-22
Inaugural Section Special Issue written by Deodato Tapete and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-02-22 with Science categories.
This book collects selected high-quality papers published in 2018–2020 to inaugurate the “Natural Hazards” Section of the Geosciences journal. The topics encompass: trends in publications at international level in the field of natural hazards research; the role of Big Data in natural disaster management; assessment of seismic risk through the understanding and quantification of its different components; climatic/hydro-meteorological hazards; and finally, the scientific analysis and disaster forensics of recent natural hazard events. The target audience includes not only specialists, but also graduate students who wish to approach the challenging, but also fascinating
Handbook Of Applied Hydrology Second Edition
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Author : Vijay P. Singh
language : en
Publisher: McGraw Hill Professional
Release Date : 2016-03-07
Handbook Of Applied Hydrology Second Edition written by Vijay P. Singh and has been published by McGraw Hill Professional this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-03-07 with Technology & Engineering categories.
Fully Updated Hydrology Principles, Methods, and Applications Thoroughly revised for the first time in 50 years, this industry-standard resource features chapter contributions from a “who’s who” of international hydrology experts. Compiled by a colleague of the late Dr. Chow, Chow’s Handbook of Applied Hydrology, Second Edition, covers scientific and engineering fundamentals and presents all-new methods, processes, and technologies. Complete details are provided for the full range of ecosystems and models. Advanced chapters look to the future of hydrology, including climate change impacts, extraterrestrial water, social hydrology, and water security. Chow’s Handbook of Applied Hydrology, Second Edition, covers: · The Fundamentals of Hydrology · Data Collection and Processing · Hydrology Methods · Hydrologic Processes and Modeling · Sediment and Pollutant Transport · Hydrometeorologic and Hydrologic Extremes · Systems Hydrology · Hydrology of Large River and Lake Basins · Applications and Design · The Future of Hydrology
Regional Skew For California And Flood Frequency For Selected Sites In The Sacramento San Joaquin River Basin Based On Data Through Water Year 2006
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Author : U.S. Department of the Interior
language : en
Publisher: Createspace Independent Pub
Release Date : 2014-10-09
Regional Skew For California And Flood Frequency For Selected Sites In The Sacramento San Joaquin River Basin Based On Data Through Water Year 2006 written by U.S. Department of the Interior and has been published by Createspace Independent Pub this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-10-09 with Nature categories.
Improved flood-frequency information is important throughout California in general and in the Sacramento-San Joaquin River Basin in particular, because of an extensive network of flood-control levees and the risk of catastrophic flooding.
Regional Skew For California And Flood Frequency For Selected Sites In The Sacramento San Joaquin River Basin Based On Data Through Water Year 2006
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Author :
language : en
Publisher:
Release Date : 2011
Regional Skew For California And Flood Frequency For Selected Sites In The Sacramento San Joaquin River Basin Based On Data Through Water Year 2006 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Flood control categories.
Development Of Regional Skew Models For Rainfall Floods In California Using Baseyian Least Squares Regression
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Author : Jonathan Richard Lamontagne
language : en
Publisher:
Release Date : 2014
Development Of Regional Skew Models For Rainfall Floods In California Using Baseyian Least Squares Regression written by Jonathan Richard Lamontagne and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
The thesis here reports on and expands the results published in Lamontagne et al. [2012]. A hybrid Bayesian weighted/generalized least squares regression procedure is used to generate regional skew models for annual maximum rainfall floods of various durations in California. The procedure uses weighted least squares to estimate the model coefficients, and generalized least squares to estimate model precision. This procedure is necessitated by the unusually high cross-correlation exhibited between concurrent rainfall floods at different sites, which caused the regression weights to become unjustifiably erratic. New diagnostic statistics are developed for this special case and applied to real data. Overall model precision is excellent, which is important in the context of Bulletin 17B flood frequency analysis. Chapter 1 of the thesis provides an introductory background to flood frequency analysis, and the scope and area of the study. Chapter 1 also describes the procedure used by the United States Army Corps of Engineers to develop the rainfall flood time series. Chapter 2 discusses the characteristics of the log-Pearson Type III distribution, the Bulletin 17B flood frequency procedure, the Expected Moments Algorithm, and the effect of outliers on frequency estimation and tests for their identification and removal. Chapter 3 describes the development of weighted least squares and generalized least squares for regionalization of hydrologic variables. Chapter 3 then derives the new hybrid weighted/generalized least squares regression procedure and its accompanying diagnostic statistics. Finally, Chapter 3 discusses recent research which uses an alternative generalized least squares framework. Chapter 4 details the application of the procedure from Chapter 3 to rainfall flood of various durations from California to create a regional skew model for California. Finally, Chapter 5 examines various aspects of the analysis in Chapter 4 which were noticeably different from previous regional skew studies. In particular, Chapter 4 reexamines the Pseudo ANOVA table and proposes a new, alternative table. ii.
Guidelines For Determining Flood Flow Frequency
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Author :
language : en
Publisher:
Release Date : 1981
Guidelines For Determining Flood Flow Frequency written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Flood forecasting categories.
Magnitude And Frequency Of Floods In The United States
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Author : L. E. Young
language : en
Publisher:
Release Date : 1967
Magnitude And Frequency Of Floods In The United States written by L. E. Young and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Floods categories.