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Determine downstream sediment deposition, reworking mechanisms, and bedload transport dynamics in a boulder bed channel following an episodic reservoir sediment release.

January 1, 2000Water Resources ResearchOpen Access

Sediment deposition and transport patterns following a reservoir sediment release

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Determine downstream sediment deposition, reworking mechanisms, and bedload transport dynamics in a boulder bed channel following an episodic reservoir sediment release.
Monitored channel morphology and sediment movement along a 12-km reach following a ~7,000 m³ silt-to-pebble sediment release into a boulder bed channel.
Assessed sediment scouring patterns and bedload transport rates across upstream and downstream pools throughout a snowmelt hydrograph.
Released sediment settled primarily in river pools and was scoured progressively downstream during snowmelt, forming a deep, narrow thalweg with persistent lateral eddy deposits.
Channels developed supply limitation first for finer grain fractions (clay to medium sand) and subsequently for coarser fractions (coarse sand to pebbles) from upstream to downstream.
Local bedload transport rates correlated directly with the depletion of stored sediment in upstream pools, modulated by flow magnitude, duration, and sequence.

Authors

EWEllen WohlColorado State University DCDaniel A. CenderelliUS Forest Service

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Implication

Field study reveals progressive pool scouring and grain-size supply limitations in a river channel, highlighting flow controls on channel recovery.

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Wohl et al. (2000) studied this question.

synapsesocial.com/papers/6a808199826e8e37b93d6dac https://doi.org/10.1029/1999wr900272

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Implication

Field study reveals progressive pool scouring and grain-size supply limitations in a river channel, highlighting flow controls on channel recovery.

Sediment deposition and transport patterns following a reservoir sediment release

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Sediment deposition and transport patterns following a reservoir sediment release

Key Points

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Implication

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