Morphodynamic evolution following sediment release from the world's largest dam removal

Ritchie, Andrew C.; Warrick, Jonathan A.; East, Amy E.; Magirl, Christopher S.; Stevens, Andrew W.; Bountry, Jennifer A.; Randle, Timothy J.; Curran, Christopher A.; Hilldale, Robert C.; Duda, Jeffrey J.; Gelfenbaum, Guy R.; Miller, Ian M.; Pess, George R.; Foley, Melissa M.; McCoy, Randall; Ogston, Andrea S.

doi:10.1038/s41598-018-30817-8

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

i

Morphodynamic evolution following sediment release from the world's largest dam removal

2018
By Ritchie, Andrew C. ; Warrick, Jonathan A. ; East, Amy E. ; ...
Source: Scientific Reports 8 (13279)

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Details:

Journal Title:

Scientific Reports
Personal Author:

Ritchie, Andrew C. ; Warrick, Jonathan A. ; East, Amy E. ; Magirl, Christopher S. ; Stevens, Andrew W. ; ... More +

Ritchie, Andrew C. ; Warrick, Jonathan A. ; East, Amy E. ; Magirl, Christopher S. ; Stevens, Andrew W. ; Bountry, Jennifer A. ; Randle, Timothy J. ; Curran, Christopher A. ; Hilldale, Robert C. ; Duda, Jeffrey J. ; Gelfenbaum, Guy R. ; Miller, Ian M. ; Pess, George R. ; Foley, Melissa M. ; McCoy, Randall ; Ogston, Andrea S. Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center) ; Sea Grant

NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center) ; Sea Grant Less -
Sea Grant Program:

WASHU (Washington Sea Grant)
Description:

Sediment pulses can cause widespread, complex changes to rivers and coastal regions. Quantifying landscape response to sediment-supply changes is a long-standing problem in geomorphology, but the unanticipated nature of most sediment pulses rarely allows for detailed measurement of associated landscape processes and evolution. The intentional removal of two large dams on the Elwha River (Washington, USA) exposed similar to 30 Mt of impounded sediment to fluvial erosion, presenting a unique opportunity to quantify source-to-sink river and coastal responses to a massive sediment-source perturbation. Here we evaluate geomorphic evolution during and after the sediment pulse, presenting a 5-year sediment budget and morphodynamic analysis of the Elwha River and its delta. Approximately 65% of the sediment was eroded, of which only similar to 10% was deposited in the fluvial system. This restored fluvial supply of sand, gravel, and wood substantially changed the channel morphology. The remaining similar to 90% of the released sediment was transported to the coast, causing similar to 60 ha of delta growth. Although metrics of geomorphic change did not follow simple time-coherent paths, many signals peaked 1-2 years after the start of dam removal, indicating combined impulse and step-change disturbance responses.
Keywords:

[+]

Dam Retirement Erosion Geomorphology
Source:

Scientific Reports 8 (13279)
DOI:

https://doi.org/10.1038/s41598-018-30817-8
Pubmed Central ID:

PMC6125403
Document Type:

Journal Article
Place as Subject:

Elwha River (Wash.)
Rights Information:

CC BY
Compliance:

PMC
Main Document Checksum:

[+]

urn:sha256:077a0c621e04c89b4c8a25f68ae5bdded486f4067684f56787f7af65b9bd8743
Download URL:

https://repository.library.noaa.gov/view/noaa/24095/noaa_24095_DS1.pdf
File Type:

[PDF-4.55 MB]