Showing papers in "Geomorphology in 1992"

TL;DR: In this paper, the relation between a stream's ability to entrain and transport sediment and the erosional resistance of floodplain alluvium that forms the channel boundary provides the basis for a genetic classification of floodplains.

TL;DR: In this article, the authors analyzed the variation in flood power both at-a-station and downstream in a basin of differing lithologies, and discussed the geologic and geomorphic controls on flood power.

TL;DR: In this article, a general and powerful three-dimensional model of fluvial erosion and deposition at hill-to-mountain-range scale is presented, which works by accumulating the effects of randomly seeded storms or floods (precipitons) that cause diffusional smoothing then move downslope on digital topography grids, that erode portions of elevation differences, that transport a slope limited amount of eroded material, and that deposit alluvium when their sediment-carrying capacity is exceeded.

TL;DR: In this article, the authors examined the transition point between scaling where unstable channel-forming processes yield to stable diffusive processes, and the difference between processes is embedded in the constitutive relation.

TL;DR: In this paper, the authors studied the influence of tectonic, climatic and lithologic influences on landscape evolution in the San Gabriel Mountains, and found that tectonism strongly influences fractal dimension at range-wavelength scales, while rock-type variation apparently influences D and I at smaller scales.

TL;DR: In this article, the authors study the interdependency between processes and forms during channel evolution and show that with time, channels adjust such that the rate of energy dissipation is minimized.

TL;DR: In this article, the spatial scale problem in process geomorphology is discussed and a theoretical framework is presented to understand the effect of scale on the evolution of a geomorphic system.

TL;DR: In this article, the authors propose a framework for analysis and modeling of complex landscapes composed of a diversity of landforms that may be characterized as equilibrium, disequilibrium or nonequilibrium.

TL;DR: In the context of the 1992 Geomorphology Symposium on Geomorphic Systems, the focus was not on detection of a single, stable equilibrium condition for geomorphic systems, but on the behavior of systems away from equilibrium, the presence and prevalence of dis- and nonequilibrium forms, and the presence of multiple equilibria for a given systems as mentioned in this paper.

TL;DR: In this article, a generalized geomorphic mass-flux system is analyzed and it is shown that the system is in most cases unstable (consistent with chaos or deterministic complexity), but the three attractor states of the system correspond exactly to the states of aggradation, degradation, and steady state.

TL;DR: The potential role that fractal parameters may have as geomorphometric measures is investigated in a number of correlation analyses as discussed by the authors, which suggests that the fractal dimension is capturing some aspect of the surface roughness that is unique.

TL;DR: Along floodplains there occurs an ordered sequence of geomorphic events during floods as mentioned in this paper, where the following sequence occurs for individual flood events: (1) the rise of floodwater and of groundwater, (2) the inundation of the floodplain; (3a) adjustments of the overbank flow pattern to the flood-plain environment, (3b) the flood peak; (4) the initial fall of floodwaters and changes in the over-bank flow patterns; (5) a gradual cessation of the flow; (6a) infiltration, evaporation

TL;DR: In this paper, microstructures within diamictons from southern Ontario, Canada, and southern Bavaria, and Baden-Wurttemburg, Germany reveal evidence illustrative of certain subglacial bed conditions.

TL;DR: In this article, an equilibrium relationship between shear velocity and apparent surface roughness is established for aeolian saltation in wind over blowing sand, and the results demonstrate an excellent example of threshold-controlled equilibrium in dynamic systems.

TL;DR: In this paper, a cross-valley transect in a low-gradient, downstream section of this watershed permitted documentation of the lateral and vertical sedimentological properties occurring during this aggradational phase.

TL;DR: In this article, a twenty-year monitoring program of hillslope gullying in the Howgill Fells, northwest England, has identified the roles of both on-slope interactions and slope/stream coupling interactions, which can be related to several temporal scales.

TL;DR: The authors assesses the utility of statistical models by examining methodological issues associated with empirical analysis of hydraulic and channel geometry relationships and presents examples of advanced statistical models that promise to enhance our understanding of the structure and dynamics of fluvial systems.

TL;DR: In this article, the authors combined analytical hydraulic geometry equations with a watershed model to quantify downstrem trends in equilibrium fluvial morphology in gravel streams, and the resulting model specifies the discharge, bedload transport rate, grain size, width, depth, slope and river bed elevation at every point in the drainage basin.

TL;DR: The enunciation of the American, systemic-process geomorphology paradigm in the mid-20th century, with particular focus on notions concerning Gilbert and systems, was discussed in this article.

TL;DR: In this article, the area-scaling method was extended and applied to surfaces developing in three-dimensional space for the purpose of deriving a parameter which might be useful in landform analysis, where the variance of height change Z 2, surface area, S, and basal area, A, measured in a number of scaling unit areas of various sizes, indicated the self-affinity of these surfaces.

TL;DR: In this paper, the preglacial landscape configuration in the Sognefjord drainage basin of western Norway is reconstructed, and the total Quaternary erosion is quantitatively determined to 7610 km 3 by subtracting the present topography from the reconstructed pre-glacial surface.

TL;DR: In the Bellinger valley, the trough is fluvial in origin but spatially variable along the profile as mentioned in this paper, with the older parts of the high floodplain dating from 3000-5000 years.

TL;DR: In this article, a model of floodplain sediment accumulation based on selective preservation of bar platform sands and prefrential preservation of vertically accreted deposits is proposed, which is independent of channel planform type.

TL;DR: In this paper, the divider method is applied to two river channel traces, a topographic contour line and a coastline to estimate the fractal dimension of geomorphic phenomena.

TL;DR: In this paper, an attempt is made to analyse the mjor lines of thought concerning change, progression and equilibrium in the work of six leading precursors of modern geomorphology: James Hutton, Charles Lyell, Charles Darwin, James Dwight Dana, Grove Karl Gilbert and Robert E. Horton.

TL;DR: In this paper, the Richardson boundary analysis of six drainage basin outlines from southern Indiana, and of an additional six from larger U.S. basins, suggests that basin boundaries are fractal or near-fractal shapes.

TL;DR: A coastal dunefield on Groote Eylandt, in the Gulf of Carpentaria, northern Australia, is stratigraphically described and dated using the coarse fraction thermoluminescence dating technique as mentioned in this paper.

TL;DR: The range of till landforms covered by the present paper includes cover and ground moraines, drumlins and flutings, Rogen landforms, marginal landforms and, in addition, two landform types, the Pulju moraine and the Sevetti moraine, which are not very well known outside Finland as mentioned in this paper.

TL;DR: In this article, a comparison of the pre-and post-late Holocene palaeo landsurfaces and palaeochannels using data from the Nene, Soar and Severn valleys is presented.

TL;DR: In this paper, a model of catchment evolution is used as the basis to study the relationship between catchment and hillslope properties, highlighting the interaction of the large-scale and small-scale features of the landscape.