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Glacial outlet valley size–ice drainage area relationships: some considerations
Author(s) -
Brook Martin S.,
Brock Ben W.,
Kirkbride Martin P.
Publication year - 2003
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/esp.488
Subject(s) - glacial period , geology , erosion , drainage , glacier , ice caps , physical geography , power law , hydrology (agriculture) , geomorphology , geography , geotechnical engineering , mathematics , ecology , statistics , biology
Previous work indicates that large variations in the power‐law relationship, relating glacial outlet valley size to ice drainage area, may occur between different glaciological settings. In this paper, we take issue with methods used to quantify the relationships of outlet valley size to drainage area size and propose a general method for comparing power‐law relationships between study areas, to determine whether or not such power‐law scalings are similar. Based on this method, we demonstrate that outlet valleys have a similar sensitivity to variation in ice‐contributing area irrespective of their glaciological setting, contrary to earlier findings. Minor variation in such relationships may reflect the different lithological and glaciological settings of the study sites and provide an insight into the physics of glacial erosional development of landscapes. Despite their limitations, we conclude that power‐law relationships are valid and, when interpreted carefully, provide a useful basis for comparing the efficiency of glacial erosion processes in different locations. Copyright © 2003 John Wiley & Sons, Ltd.