846 research outputs found
Messy Rivers are Healthy Rivers
No full textEllen Wohl, Colorado State University - Perceptions of river health are influenced by expectations regarding the appearance of a natural river, but appearance depends on geomorphic context and river history. I examine how physical complexity – messiness – influences river health, how human activities simplify rivers and compromise river health, and how we can restore complexity and ecosystem services provided by rivers.
Wohl is a Fellow of both the Geological Society of America and the American Geophysical Union and has received many awards, including the Gladys W. Cole Memorial Award from the Geological Society of America, the Kirk Bryan Award from the Geological Society of America, the G.K. Gilbert Award from the Association of American Geographers, and the Award for Outstanding Contributions to Interdisciplinary Water Education, Research.https://scholarworks.boisestate.edu/ideas_of_nature_gallery/1013/thumbnail.jp
Ecological Transitions: Regime Shifts, Thresholds and Tipping Points. Oxford Bibliographies in Environmental Science
No full textOxford Bibliographies in Environmental Science. Ed. EIC Ellen Wohl. New York: Oxford University Pres
Ecological Transitions: Regime Shifts, Thresholds and Tipping Points. Oxford Bibliographies in Environmental Science
No full textOxford Bibliographies in Environmental Science. Ed. EIC Ellen Wohl. New York: Oxford University Pres
Working with wood in rivers in the Western United States
No full textRecognition of the important physical and ecological roles played by large wood in channels and on floodplains has grown substantially during recent decades. Although large wood continues to be routinely removed from many river corridors worldwide,the practice of wood reintroduction has spread across the United States, the United Kingdom and western Europe, Australia, and New Zealand. The state-of-science regarding working with wood in rivers was discussed during a workshop held in Colorado, USA, in September 2022 with 40 participants who are scientists and practitioners from across the USA, UK, Europe, and Japan. The objectives of this paper are to present the findings from the workshop; summarize two case studies of wood in river restoration in the western United States; and provide suggestions for advancing the practice of wood in river management. We summarize the workshop results based on participant judgements and recommendations with respect to:(i) limitations and key barriers to using wood, which reflect perceptions and practicalities; (ii) gaps in the use of large wood in river management; (iii) scenarios in which wood is generally used effectively; and (iv) scenarios in which wood is generally not used effectively. The case studies illustrate the importance of the local geomorphic context, the configuration complexity of the wood, and the potential for modification of river corridor morphology to enhance desired benefits. Moving forward, we stress the importance of collaboration across disciplines and across communities of research scientists, practitioners, regulators, and potential stakeholders; accounting for stake-holder perceptions of the use of large wood; and increasing non-scientist access to the latest state-of-science knowledg
Book Review: SueEllen Campbell, Alex Hunt, Richard Kerridge, Tom Lynch, and Ellen Wohl, The Face of the Earth: Natural Landscapes, Science, and Culture.
No full textBook Review: SueEllen Campbell, Alex Hunt, Richard Kerridge, Tom Lynch, and Ellen Wohl, The Face of the Earth: Natural Landscapes, Science, and Culture.  
Geomorphic response to an extreme flood in two Mediterranean rivers (northeastern Sardinia, Italy): Analysis of controlling factors
No full textA high-magnitude, low-frequency flash flood affected two ungauged rivers (northeastern Sardinia, Italy) on 18
November 2013. This study investigates the response of channel reaches in a Mediterranean environment
featuring different morphological settings (i.e., alluvial, semialluvial, and bedrock boundaries) with the aims of
(i) detecting the morphological effects of this large flood and (ii) analyzing a range of morphological and
hydraulic variables as potential controlling factors of channel response. Channel widening was the dominant
geomorphic response observed, and it occurred at different magnitudes among the study subreaches. Within
individual subreaches, channel width increased from 1.1 to 6.2 times the pre-flood width. A significant trend in
channel widening is observed, especially in alluvial subreaches where the narrowest channels were prone to
enlarge more compared to the widest channels. Considerable erosion of valley sides also occurred in confined
and partly confined semialluvial and bedrock subreaches. A range of parameters influenced the geomorphic role
of the flood, and a series of selected morphological and hydraulic controlling factors showed robust correlations
with changes in channel width, although correlations were stronger in alluvial subreaches. Analysis and
documentation of channel response and its variability through different morphological settings is crucial to
provide a basis from which to forecast future river sensitivity to geomorphic adjustment to high-magnitude
floods and improve flood management strategies
A mission for medicine : Dr Ellen Farrer and India 1891-1933.
No full textSIGLEAvailable from British Library Document Supply Centre-DSC:DXN012997 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Messy Rivers are Healthy Rivers (Lecture)
No full textPerceptions of river health are influenced by expectations regarding the appearance of a natural river, but appearance depends on geomorphic context and river history. I examine how physical complexity – messiness – influences river health, how human activities simplify rivers and compromise river health, and how we can restore complexity and ecosystem services provided by rivers.
Wohl is a Fellow of both the Geological Society of America and the American Geophysical Union and has received many awards, including the Gladys W. Cole Memorial Award from the Geological Society of America, the Kirk Bryan Award from the Geological Society of America, the G.K. Gilbert Award from the Association of American Geographers, and the Award for Outstanding Contributions to Interdisciplinary Water Education, Research
Transient landscapes: insights on a changing planet
No full textIncludes bibliographical references and index.Landscape-the unique combination of landforms, plants, animals, and weather that compose any natural place-is inherently transient. Each essay in Transient landscapes, Wohl introduces this idea of an ever-shifting, ever-transitioning global landscape, revealing how to see the ubiquity of landscape transience, both that which results through the earth's natural environmental and climatological process and which comes from human intervention.--Provided by publisher
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