TY - JOUR
T1 - Selective sorting and abrasion of river gravel. II
T2 - Applications
AU - Parker, Gary
N1 - This research was not formally funded. It is, however, an outgrowth of an environmental study done under contract for Ok Tedi Mining Ltd., Papua New Guinea. The cooperation and encouragement of A. M. Murray and D. Paige of that organization is gratefully acknowledged. Part of the research was performed while visiting K. Ashida, of the Disaster Prevention Research Institute, Kyoto University, Japan; and G. Seminara, of the Institute of Hydraulics, University of Genova, Italy, in the course of a sabbatical leave. The financial support of these two organizations is much appreciated. Dis-cussions with the following people proved to be very helpful; M. Church, W. Dietrich, S. Egashira, R. Kellerhals, J. Kirchner, C. Paola, J. Shaw, and J. Dungan Smith.
PY - 1991/2
Y1 - 1991/2
N2 - Most gravel rivers show a tendency for characteristic grain size to decrease in the downstream direction over scales of tens or hundreds of kilometers. It has been surmised that this downstream fining is due to some combination of selective sorting, by which finer grains are preferentially transported downstream; and abrasion, by which individual particles are reduced in size. Here the framework for the simultaneous treatment of both phenomena, developed in a companion paper, is used to analyze several cases of interest. In particular, wavelike aggradational profiles of permanent form are considered. An application to the Red Deer River, in Alberta, Canada, as well as several hypothetical cases, suggests the following result. In the case of quartzite, selective sorting controls downstream fining; in the case of limestone, abrasion and selective sorting are of roughly equal importance; and in the case of a mixture of quartz and limestone, abrasion ceases to be important beyond some characteristic length scale required to grind the gravel-sized limestone out of existence.
AB - Most gravel rivers show a tendency for characteristic grain size to decrease in the downstream direction over scales of tens or hundreds of kilometers. It has been surmised that this downstream fining is due to some combination of selective sorting, by which finer grains are preferentially transported downstream; and abrasion, by which individual particles are reduced in size. Here the framework for the simultaneous treatment of both phenomena, developed in a companion paper, is used to analyze several cases of interest. In particular, wavelike aggradational profiles of permanent form are considered. An application to the Red Deer River, in Alberta, Canada, as well as several hypothetical cases, suggests the following result. In the case of quartzite, selective sorting controls downstream fining; in the case of limestone, abrasion and selective sorting are of roughly equal importance; and in the case of a mixture of quartz and limestone, abrasion ceases to be important beyond some characteristic length scale required to grind the gravel-sized limestone out of existence.
UR - https://www.scopus.com/pages/publications/0026114211
UR - https://www.scopus.com/pages/publications/0026114211#tab=citedBy
U2 - 10.1061/(ASCE)0733-9429(1991)117:2(150)
DO - 10.1061/(ASCE)0733-9429(1991)117:2(150)
M3 - Article
AN - SCOPUS:0026114211
SN - 0733-9429
VL - 117
SP - 150
EP - 171
JO - Journal of Hydraulic Engineering
JF - Journal of Hydraulic Engineering
IS - 2
ER -