• Corpus ID: 4714059

Geomorphic thresholds : the concept and its applicationsI

  title={Geomorphic thresholds : the concept and its applicationsI},
  author={Stanley Alfred Schumm},
Geomorphic thresholds were defined initially as the condition at which there is a significant landform change without a change of external controls such as base level, climate and land use. Landforms evolve to a condition of incipient instability following which change or failure occurs. Subsequently, through usage, the definition has been broadened to include abrupt landform change as a result of progressive hange roof external controls. Therefore, it is now appropriate to recognize both… 
Alluvial channel response to environmental perturbations: fill-terrace formation and sediment-signal disruption
Abstract. The sensitivity of fluvial systems to tectonic and climatic boundary conditions allows us to use the geomorphic and stratigraphic records as quantitative archives of past climatic and
Getting the basic ground model right in engineering practice
  • G. Hearn
  • Computer Science
    Quarterly Journal of Engineering Geology and Hydrogeology
  • 2020
The approach to ground modelling should be devised to suit the geological and geomorphological challenges that pertain and the context and manner in which the model is to be used. Several case
Ecogeomorphology in the Australian drylands and the role of biota in mediating the effects of climate change on landscape processes and evolution
Abstract Australian dryland landscape has developed under the influence of aridity, low relief, tectonic stability and biota adapted to nutrient and water scarcity. The biota in general, but notably
Breaking rocks made easy. Blending stress control concepts to advance geomorphology
All landscapes are subject to stress fields, conditioned by their formation and ongoing tectonic and geomorphic changes. With this ESEX Commentary we wish to stimulate a debate on this invisible but
Drainage reorganization during mountain building in the river system of the Eastern Cordillera of the Colombian Andes
The Eastern Cordillera of Colombia is a thick-skinned thrust-fold belt that is characterized by two topographic domains: (1) the axial zone, a high altitude plateau (the Sabana de Bogota, 2500 masl)
Understanding Human–Landscape Interactions in the “Anthropocene”
This article summarizes the primary outcomes of an interdisciplinary workshop in 2010, sponsored by the U.S. National Science Foundation, focused on developing key questions and integrative themes
Les Penck en Forêt Noire : une théorie géomorphologique entre ombre et lumière
Celebres en leur temps, les geomorphologues allemands Albrecht et Walther Penck sont aujourd'hui largement oublies, par exemple non cites par les chercheurs qui travaillent en Foret Noire. Les
Form and process based geomorphic classification and mapping of a meandering river using satellite remote sensing data
The Rapti River system in India was chosen for geomorphic classification and mapping based on form and process using modern techniques such as satellite remote sensing data, digital elevation model


Episodic Erosion: A Modification of the Geomorphic Cycle,
Abstract : Most models of geomorphic evolution are oversimplified and, therefore, they are unsatisfactory for short-term interpretation of landform change. For example, the extrapolation of average
Gully Erosion, Northwestern Colorado: A Threshold Phenomenon
The widespread occurrence of discontinuous gullies in the oil-shale region of northwestern Colorado is of particular concern because of the resulting progressive destruction of the valley floors.
Grade is a condition of equilibrium in streams as agents of transportation. The validity of the concept has been questioned, but it is indispensable in any genetic study of fluvial erosional features
The development of montane arroyos and gullies
Field investigations in the Front Range of Colorado, U.S.A., confirm that the spatial distribution of vegetation in watersheds exerts strong control on the entrenchment of streams in the montane
What are glacier surges
A total of 204 surging glaciers has been identified in western North America. These glaciers surge repeatedly and probably with uniform periods (from about 15 to greater than 100 years). Ice flow
Modern Terrace Development Near Pyramid Lake, Nevada, and its Geologic Implications
The Truckee River rises high in the Sierra Mountains and ends 30 mi (48 km) northeast of Reno, Nevada, where it empties into Pyramid Lake, the largest remnant of Pleistocene Lake Lahontan. Since
Magnitude and Frequency of Forces in Geomorphic Processes
The relative importance in geomorphic processes of extreme or catastrophic events and more frequent events of smaller magnitude can be measured in terms of (1) the relative amounts of "work" done on
Dynamic process-response model of river channel development
Feedback mechanisms, which operate upstream through drawdown and backwater effects and downstream through sediment discharge are responsible for channel evolution. By combining these mechanisms with
Reconnaissance study of erosion and deposition produced by the flood of August 1955 in Connecticut
A large area in the valley bottoms in Connecticut was inundated by the flood of August 1955. Relative to the total area flooded that part permanently modified by the flow was surprisingly small.
The Tempo of Geomorphic Change
  • M. Gage
  • Geology
    The Journal of Geology
  • 1970
Differing concepts of the perspective of geologic time and of the time requirements of geomorphic processes are seen as a major cause of misunderstandings between geologists on the one hand and