CGRG Bibliography of Canadian Geomorphology
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Author : Church, M.; and Hassan, M.A,
Date : 2001.
Title : Introduction to the special issue on sediment transport dynamics.
Publication : Earth Surface Processes and Landforms
Issue : 26(13):
Page(s) : 1367-1368.
Abstract
The papers in this issue derive from a conference on Drainage Basin Dynamics and Morphology held in May 1999 at the Hebrew University of Jerusalem. The conference was a tribute to the contributions made by Professor Asher P. Schick to the science of geomorphology. The conference was sponsored by the Hebrew University of Jerusalem, International Association of Geomorphologists (IAG), International Commission on Continental Erosion of the International Association of Hydrological Sciences (IAHS), International Geographical Union (IGU) Commissions on Geomorphic Response to Environmental Change, Land Degradation and Desertification, and Commission on Global Continental Paleohydrology of the International Quaternary Research Association (INQUA). The 52 papers presented in the conference covered all aspects of fluvial sediment dynamics and river channel and drainage basin morphology. The contributions included in this issue address a range of topics within the general theme of fluvial sediment transport dynamics; they present results from theoretical analyses, laboratory flume modelling, and field observations. The papers address fundamental questions in fluvial morphology that reflect Schick’s interests and contributions, including effective discharge and channel dynamics, sediment transport modelling and rating relations, and channel stability. Emmett and Wolman use bed material rating relations to estimate the effective discharge in five snowmelt-dominated, gravel-bed rivers in the northern Rocky Mountains of the United States. Effective discharge is related to the level of constraint on sediment mobility: armoured rivers yield steeper rating relations, and their effective discharge occurs at higher stages and greater recurrence intervals than bankfull discharge. Duizendstra estimates sediment transport in a large river using both bedload measurements and survey cross-sections. He stresses the importance of making cross-sectionally distributed transport measurements and of using more than one method, in order to obtain reasonable estimates. Wilcock details a new approach for the prediction of sediment transport that is calibrated using relatively accurate measurements from small pit-trap samplers. This approach reduces flow-scaling errors, nearly eliminates the uncertainties associated with field measurements, and increases the accuracy of bed material transport estimates. Lisle et al. explore the behaviour of sediment waves in gravel-bed rivers. The initial wave geometry and grain size characteristics are moderated by the interactions between flow and sediment transport. They conclude that such waves are highly dispersive, and exhibit significant translation only after substantial dispersion has already occurred. Simon and Collison explore the effects of pore-water pressure on the stability of cohesive streambeds. Based on field observations, laboratory experiments and numerical modelling, the authors argue that pore-water pressure affects both resisting and driving forces of sediment transport in such streams. Finally, Abrahams et al. present a total sediment transport formula for the prediction of sediment transport for interrill overland flow. The equation is based on flume experiments in which sediment transport capacity was measured for a wide range of flow conditions, slopes, rainfall intensities, particle size, roughness size, and sediment concentrations. Calibrations reveal that the model yields good estimates of total sediment transport for volumetric sediment concentrations less than 0 Ð 2. Altogether the full range of fluvial sediment transport phenomena is explored, using the full range of approaches to the subject. The collection fittingly reflects the breadth of Asher Schick’s interests.
Bibliography of Canadian Geomorphology