• 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

New GML-Based Application Schema for Landforms, Processes and Their Interaction

Here we propose an application schema for features and processes of science of geomorphology based on international geoinformation standards. Using the Geography Markup Language and the Unified

The use of fluvial archives in reconstructing landscape evolution: the value of sedimentary and morphostratigraphical evidence

Abstract Evidence-based interpretations of fluvial evolution, and especially of river-terrace formation, have advanced significantly in recent decades, with a notable contribution made by activities

Getting the basic ground model right in engineering practice

  • G. Hearn
  • Geology
    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

Climate, tectonics or morphology: what signals can we see in drainage basin sediment yields?

Abstract. Sediment yields from river basins are typically considered to be controlled by tectonic and climatic drivers. However, climate and tectonics can operate simultaneously and the impact of

Morphodynamic styles: characterising the behaviour of gravel-bed rivers using a novel, quantitative index

Abstract. The assessment of channels widely focusses on using channel form to identify channel character, but fail to capture the more nuanced variations of morphodynamics without the analysis of

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

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

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

The Potential Use of Osl Properties of Quartz in Investigating Fluvial Processes on the Catchment of River Mureş, Romania

Abstract To understand the functioning of fluvial systems it is important to investigate dynamics of sediment transport and the source of sediments. In case of reconstructing past processes these



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


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

Dynamic process-response model of river channel development

  • R. Hey
  • Environmental Science
  • 1979
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

Origin and evolution of rock fans and pediments

INTRODUCTION THE PROBLEM: REVIEW OF EARLIER WORK The physiography of the arid lands of the Great Basin and of the open basins south of it, stretching across Arizona into Sonora, Mexico, early

Sinuosity of Alluvial Rivers on the Great Plains

Data on the morphologic and sediment characteristics of stable alluvial rivers of the Great Plains were collected at 50 cross sections. The channel patterns of these rivers were classified into five