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Ephemeral-Stream Processes: Implications for Studies of Quaternary Valley Fills

Published online by Cambridge University Press:  20 January 2017

Peter C. Patton  and
Stanley A. Schumm
Peter C. Patton
Affiliation:
Department of Earth and Environmental Sciences, Wesleyan University, Middletown, Connecticut 06457
Stanley A. Schumm
Affiliation:
Department of Earth Resources, Colorado State University, Fort Collins, Colorado 80523
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Abstract

Three unstable ephemeral-stream channels (arroyos), which drain source areas that have high sediment yields ranging from predominantly sand (Arroyo Calabasas) to a mixture of sand, silt, and clay (Sand Creek) to largely silt and clay (Sage Creek), were resurveyed to provide data on the rates and mechanics of erosion and sedimentation processes during periods ranging from 14 to 22 yr. Channel morphology changed significantly. Erosion occurred through nickpoint recession and bank collapse, but erosional reaches are separated by aggrading or stable-channel reaches. In general, sediment that is eroded, as the nickpoint recedes upstream, is trapped in the widened channel downstream. In this manner sediment is transported episodically out of these basins during a series of cut-and-fill cycles. The manner by which the channels aggrade and the morphology of the aggraded stable channels are controlled by the sediment type. The wide and shallow channel of Arroyo Calabasas is filled by vertical accretion of sand-size sediment. The narrow and deep channels of Sage Creek and Sand Creek are created by the lateral accretion of cohesive fine-grained sediment. The channel modification and the cut-and-fill episodes are dependent on high sediment yields, and therefore they are independent of subtle climatic shifts. Cut-and-fill deposits that have been created in this manner should not be equivalent in age from basin to basin, and therefore channel trenching and filling in the semiarid western United States during the Holocene need not be synchronous.

Type
Research Article
Information
Quaternary Research , Volume 15 , Issue 1 , January 1981 , pp. 24 - 43
Copyright
University of Washington

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