WorldCat Identities

Ettema, R.

Overview
Works: 44 works in 76 publications in 1 language and 1,376 library holdings
Genres: Case studies  Conference papers and proceedings  Biography 
Roles: Author, Editor, Originator, Thesis advisor
Classifications: GB2401, 627.011
Publication Timeline
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Most widely held works by R Ettema
Hydraulic modeling : concepts and practice( )

6 editions published in 2000 in English and held by 452 WorldCat member libraries worldwide

The manual provides several different methods of hydraulic modeling from which to choose to produce the data sought. Topics include: similitude and dimensional analysis, single-phase flow, loose boundary flow, gas-liquid flows, environmental flows, coastal and estuarine processes, ice, debris, hydroelastic vibrations and hydraulic machinery
Evaluation of bridge-scour research : abutment and contraction scour processes and prediction by Terry W Sturm( )

2 editions published in 2011 in English and held by 336 WorldCat member libraries worldwide

This report reviews the present state of knowledge regarding bridge-abutment scour and the veracity of the leading methods currently used for estimating design scour depth
Model ice properties by Jon E Zufelt( Book )

3 editions published in 1996 in English and held by 142 WorldCat member libraries worldwide

Experimental hydraulics : methods, instrumentation, data processing and management by Marian Muste( )

2 editions published in 2017 in English and held by 90 WorldCat member libraries worldwide

"This is the first volume of a two-volume guide to designing, conducting and interpreting laboratory and field experiments in a broad range of topics associated with hydraulic engineering. Specific guidance is provided on methods and instruments currently used in experimental hydraulics, with emphasis on new and emerging measurement technologies and methods of analysis. Additionally, this book offers a concise outline of essential background theory, underscoring the intrinsic connection between theory and experiments. This book is much needed, as experimental hydraulicians have had to refer to guidance scattered in scientific papers or specialized monographs on essential aspects of laboratory and fieldwork practice. The book is the result of the first substantial effort in the community of hydraulic engineering to describe in one place all the components of experimental hydraulics. Included is the work of a team of more than 45 professional experimentalists, who explore innovative approaches to the vast array of experiments of differing complexity encountered by today's hydraulic engineer, from laboratory to field, from simple but well-conceived to complex and well-instrumented. The style of this book is intentionally succinct, making frequent use of convenient summaries, tables and examples to present information. All researchers, practitioners, and students conducting or evaluating experiments in hydraulics will find this book useful."--Provided by publisher
Frazil ice formation by R Ettema( Book )

1 edition published in 1984 in English and held by 79 WorldCat member libraries worldwide

Hans Albert Einstein : his life as a pioneering engineer by R Ettema( Book )

4 editions published between 1900 and 2014 in English and Undetermined and held by 51 WorldCat member libraries worldwide

Rivers have always shaped the development of human society, their flows of water and sediment influencing food production, transportation, industrial activity, and power generation. Extreme flows that cause flood and drought, erosion, and sedimentation have brought widespread damage and untold misery. Since ancient times, people have known that river flows transport sediment, but not until the start of the twentieth century did engineers and scientists begin to understand the complex interaction of flowing water and sediment. In this biography, Robert Ettema and Cornelia Mutel engagingly describe the work of one man —Hans Albert Einstein— and his search to understand and unravel the complexities of rivers. The son of Albert Einstein, Hans Albert developed theoretical insights and practical methods that helped lay groundwork for our current understanding of how flowing water transports sediment. Hans Albert's career was shaped by his early life and formal education in Switzerland, his move to the United States in the 1930s, and growing U.S. concerns about an array of sediment problems. The dynamic relationship with his famous father was played out against a backdrop of family quarrels and illness and political tensions. Though working in different fields of science, Hans Albert and Albert each stood at a scientific frontier. This shared circumstance enriched their relationship. Hans Albert Einstein: His Life as a Pioneering Engineer is a chronological walk through Hans Albert's life and his contributions to our understanding of river behavior. It includes the first published discussion of his personal interactions with his parents and brother, as well as his relationships with his wives and children. These details of family life parallel the examination of Hans Albert's search for formulas relating sediment transport and water flow in rivers. Hans Albert's research is positioned within the broader history of river engineering. This book gives a taste of the centuries-old efforts to define order in river behavior. Such efforts continue to the present day
Frazil ice formation by R Ettema( Book )

3 editions published in 1984 in English and held by 32 WorldCat member libraries worldwide

Unsteady ice jam processes by Jon E Zufelt( Book )

2 editions published in 1997 in English and held by 30 WorldCat member libraries worldwide

Ice jams cause flooding in northern temperate climate areas, usually forming rapidly, often with little warning, constricting water flow and elevating water levels. Consequently, jam formation comprises highly unsteady processes: drifting ice pieces are brought to rest, accumulated ice shoves and thickens, and initial water depths and velocities change. Those processes are even more unsteady when a jam collapses. Prior simulations of ice jams, however, treat them as simply stationary, uniformly thick accumulations of ice pieces. No account is taken of the impact forces exerted by moving ice, an estimation that is further complicated by the need to couple equations describing water flow and ice movement. Under the dynamic conditions attendant to jam formation, water flow and ice movement interactively influence each other. This report evaluates the importance of ice momentum on ice jam thickness and thickness distribution using experiments conducted with laboratory flumes and a numerical model in which the equations of motion for one dimensional flow of water and ice are solved as fully coupled. In this regard, the model is unique, enabling simulation of the important unsteady interactions of water and ice, and determination of their effects on jam thickness. Ice momentum should be taken into account for most jams because it leads to significantly thicker jams and affects the thickness profile. A useful dimensionless parameter is identified for generalizing this finding
Ice study for the Port of Nome, Alaska by R Ettema( Book )

3 editions published in 1982 in English and held by 24 WorldCat member libraries worldwide

Naled ice growth by Gerald Allen Schohl( Book )

1 edition published in 1986 in English and held by 20 WorldCat member libraries worldwide

Countermeasures to protect bridge abutments from scour by Brian D Barkdoll( )

4 editions published in 2007 in English and held by 13 WorldCat member libraries worldwide

Examines selection criteria and guidelines for the design and construction of countermeasures to protect bridge abutments and approach embankments from scour damage. The report explores two common forms of bridge abutments--wing-wall (vertical face with angled walls into the bank) and spill-through (angled face)
Unconventional energy sources for ice control at lock and dam installations by Tatsuaki Nakato( Book )

1 edition published in 1992 in English and held by 13 WorldCat member libraries worldwide

Ice jam dynamics by Jon E Zufelt( )

2 editions published in 1996 in English and held by 10 WorldCat member libraries worldwide

Scour at bridge piers by R Ettema( Book )

2 editions published between 1980 and 1988 in English and held by 10 WorldCat member libraries worldwide

Factors influencing ice conveyance at river confluences( )

3 editions published in 1997 in English and held by 8 WorldCat member libraries worldwide

This report documents preliminary findings concerning ice jam conditions in river confluences, using two laboratory approaches. First is categorizing the different conditions of ice discharge into a confluence based on two general classifications: free drift of ice and movement of contiguous ice accumulations. The variables defining ice discharge for the two categories are assembled via dimensional analysis into two consistent sets of nondimensional parameters. The categorization, together with the nondimensional parameters, is used to evaluate ice jam problems at confluences the two most common causes of jams seem to be sluggish water velocities in the outflow channel and local bathymetric features. The second approach examines how confluence geometry and flow processes affect ice discharge for example, the influence on ice discharge of bathymetric features. The approach uses a large hydraulic model of a two channel confluence, which is adaptable to a variety of channels, and particle image velocimetry (PIV) for determining and mapping whole fields of water and ice velocities in a confluence. PIV, which is becoming extensively used, lends itself very well here. This study is the first demonstration of the PIV method for ice movement through a two river confluence. It shows promise. The hydraulic model and PIV method are used in a case study of ice discharge through the confluence of the Missouri and Mississippi rivers, a confluence prone to severe ice jams
Development of self-cleaning box culvert designs by Marian Muste( Book )

1 edition published in 2009 in English and held by 8 WorldCat member libraries worldwide

The main function of a roadway culvert is to effectively convey drainage flow during normal and extreme hydrologic conditions. This function is often impaired due to the sedimentation blockage of the culvert. This research sought to understand the mechanics of sedimentation process at multi-box culverts, and develop self-cleaning systems that flush out sediment deposits using the power of drainage flows. The research entailed field observations, laboratory experiments, and numerical simulations. The specific role of each of these investigative tools is summarized: The field observations were aimed at understanding typical sedimentation patterns and their dependence on culvert geometry and hydrodynamic conditions during normal and extreme hydrologic events. The laboratory experiments were used for modeling sedimentation process observed in-situ and for testing alternative self-cleaning concepts to culverts. The major tasks for the initial laboratory model study were to accurately replicate the culvert performance curves and the dynamics of sedimentation process, and to provide benchmark data for numerical simulation validation. The numerical simulations enhanced the understanding of the sedimentation processes and aided in testing flow cases complementary to those conducted in the model reducing the number of (more expensive) tests to be conducted in the laboratory. Using the findings acquired from the laboratory and simulation works, self-cleaning culvert concepts were developed and tested for a range of flow conditions. The screening of the alternative concepts was made through experimental studies in a 1:20 scale model guided by numerical simulations. To ensure the designs are effective, performance studies were finally conducted in a 1:20 hydraulic model using the most promising design alternatives to make sure that the proposed systems operate satisfactory under closer to natural scale conditions
Evaluation of bridge scour research : pier scour processes and predictions by R Ettema( )

1 edition published in 2011 in English and held by 7 WorldCat member libraries worldwide

This report explores the current state of knowledge regarding bridge pier scour, assesses several methods for design estimates of scour depth, examines a structured methodology for scour depth estimation for design purposes, and highlights aspects of pier scour in need of potential further research
Issues and directions in hydraulics : proceedings of an Iowa hydraulics colloquium, Iowa City, Iowa, USA, 22-24 May 1995 by Iowa Hydraulics Colloquium( Book )

3 editions published in 1996 in English and held by 6 WorldCat member libraries worldwide

An illustrated guide for monitoring and protecting bridge waterways against scour by R Ettema( Book )

1 edition published in 2006 in English and held by 5 WorldCat member libraries worldwide

This report is a well illustrated and practical Guide intended to aid engineers and engineering technicians in monitoring, maintaining, and protecting bridge waterways so as to mitigate or prevent scour from adversely affecting the structural performance of bridge abutments, piers, and approach road embankments. Described and illustrated here are the scour processes affecting the stability of these components of bridge waterways. Also described and illustrated are methods for monitoring waterways, and the various methods for repairing scour damage and protecting bridge waterways against scour. The Guide focuses on smaller bridges, especially those in Iowa. Scour processes at small bridges are complicated by the close proximity of abutments, piers, and waterway banks, such that scour processes interact in ways difficult to predict and for which reliable design relationships do not exist. Additionally, blockage by woody debris or by ice, along with changes in approach channel alignment, can have greater effects on pier and abutment scour for smaller bridges. These considerations tend to cause greater reliance on monitoring for smaller bridges. The Guide is intended to augment and support, as a source of information, existing procedures for monitoring bridge waterways. It also may prompt some adjustments of existing forms and reports used for bridge monitoring. In accord with increasing emphasis on effective management of public facilities like bridges, the Guide ventures to include an example report format for quantitative risk assessment applied to bridge waterways. Quantitative risk assessment is useful when many bridges have to be evaluated for scour risk and damage, and priorities need to be determined for repair and protection work. Such risk assessment aids comparison of bridges at risk. It is expected that bridge inspectors will implement the Guide as a concise, handy reference available back at the office. The Guide also likely may be implemented as an educational primer for new inspectors who have yet to become acquainted with waterway scour. Additionally, the Guide may be implemented as a part of process to check whether existing bridge-inspection forms or reports adequately encompass bridge-waterway scour
A study of ice-covered flow in an alluvial bend by Whey-Fone Tsai( Book )

1 edition published in 1996 in English and held by 4 WorldCat member libraries worldwide

 
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Audience Level
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Audience level: 0.52 (from 0.24 for Hans Alber ... to 0.80 for Naled ice ...)

Hydraulic modeling : concepts and practice
Covers
Alternative Names
Ettema, Robert

Languages
English (45)