|
Detailed Reference Information |
Talbot, T. and Lapointe, M. (2002). Modes of response of a gravel bed river to meander straightening: The case of the Sainte-Marguerite River, Saguenay Region, Quebec, Canada. Water Resources Research 38: doi: 10.1029/2001WR000324. issn: 0043-1397. |
|
In the 1960s, extensive meander straightening (rectification) was conducted along 8 km of the Sainte-Marguerite River to facilitate highway construction along the valley bottom. Comparison of long profiles and data on bed pavement caliber from the current river channel and the man-made oxbows sheds light on the multifaceted responses to this anthropogenic perturbation of the river over the last 4 decades: (1) reprofiling consisting of 1 m of bed incision in the upper 4 km coupled with 2 m of bed aggradation in the lower 2 km of the straightened reach; (2) a doubling of the caliber of bed pavement in the zone of maximum degradation; (3) regrowth of three meanders within the reach, increasing its length by 7% (400 m); and (4) net input of 4 ¿ 104 m3 of valley-side sediment from channel erosion into three terraces. Hydraulic and sediment transport reconstructions indicate that reprofiling and pavement coarsening over nearly 4 decades equally contributed to transport reequilibration along the reach, while meander regrowth and lateral sediment inputs from terraces played minor roles. |
|
|
|
BACKGROUND DATA FILES |
|
|
Abstract |
|
|
|
|
|
Keywords
Hydrology, Erosion and sedimentation, Hydrology, Geomorphology, Global Change, Geomorphology and weathering (1824, 1886), Hydrology, Runoff and streamflow, Hydrology, Floods |
|
Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
|
|
|