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Competing effects of vegetation density on sedimentation in deltaic marshes

Author

Listed:
  • Yuan Xu

    (Tsinghua University
    Massachusetts Institute of Technology)

  • Christopher R. Esposito

    (The Water Institute of The Gulf
    Tulane University)

  • Maricel Beltrán-Burgos

    (Tulane University)

  • Heidi M. Nepf

    (Massachusetts Institute of Technology)

Abstract

Marsh vegetation, a definitive component of delta ecosystems, has a strong effect on sediment retention and land-building, controlling both how much sediment can be delivered to and how much is retained by the marsh. An understanding of how vegetation influences these processes would improve the restoration and management of marshes. We use a random displacement model to simulate sediment transport, deposition, and resuspension within a marsh. As vegetation density increases, velocity declines, which reduces sediment supply to the marsh, but also reduces resuspension, which enhances sediment retention within the marsh. The competing trends of supply and retention produce a nonlinear relationship between sedimentation and vegetation density, such that an intermediate density yields the maximum sedimentation. Two patterns of sedimentation spatial distribution emerge in the simulation, and the exponential distribution only occurs when resuspension is absent. With resuspension, sediment is delivered farther into the marsh and in a uniform distribution. The model was validated with field observations of sedimentation response to seasonal variation in vegetation density observed in a marsh within the Mississippi River Delta.

Suggested Citation

  • Yuan Xu & Christopher R. Esposito & Maricel Beltrán-Burgos & Heidi M. Nepf, 2022. "Competing effects of vegetation density on sedimentation in deltaic marshes," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32270-8
    DOI: 10.1038/s41467-022-32270-8
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