The effects of channelization on a high-energy river |
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| Authors: | Ale F Ritter |
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| Institution: | (1) Department of Geology Southern Illinois University at Carbondale, USA |
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| Abstract: | Extensive channelization of a high-energy river in Montana was accomplished during 1957–1958. The technique applied was the
same throughout, even the fluvial characteristics are considerably different in the and downstream segments of the river.
In the braided reach, rubble dikes composed of river bedload that was against the channel banks prevent the river from high-stage
channels which traverse the lowest surface in the valley. The river has responded by altering its hydrologic characteristics
at any given discharge and by accelerating the lateral erosion where banks have been left unprotected. Downstream, where the
river is in a single-channel pattern, the dikes have been destroyed because the meandering thalweg, repeatedly shifting its
position and impinging against the base of the dikes, provides the force needed to erode the boulders comprising the dikes.
Some bank protection is provided by riprap composed of large sandstone blocks. This method works, however, only if long segments
of the channel are riprapped. The various responses of the river in reaches having different channel patterns indicates that
some knowledge of local fluvial mechanics must be obtained prior to the channelization. |
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