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Title: Shape and dynamics of seepage erosion in a horizontal granular bed

Abstract

We examine erosion patterns observed in a horizontal granular bed resulting from seepage of water motivated by observation of beach rills and channel growth in larger scale land forms. Our experimental apparatus consists of a wide rectangular box filled with glass beads with a narrow opening in one of the side walls from which eroded grains can exit. Quantitative data on the shape of the pattern and erosion dynamics are obtained with a laser-aided topography technique.We report that the spatial distribution of the source of groundwater can significantly impact the shape of observed patterns. An elongated channel is observed to grow upstream when groundwater is injected at a boundary adjacent to a reservoir held at constant height. An amphitheater (semicircular) shape is observed when uniform rainfall infiltrates the granular bed to maintain a water table. Bifurcations are observed as the channels grow in response to the groundwater. We further find that the channels grow by discrete avalanches as the height of the granular bed is increased above the capillary rise, causing the deeper channels to have rougher fronts. The spatiotemporal distribution of avalanches increase with bed height when partial saturation of the bed leads to cohesion between grains. Yet, themore » overall shape of the channels is observed to remain unaffected indicating that seepage erosion is robust to perturbation of the erosion front.« less

Authors:
 [1];  [2];  [3];  [4];  [2]
  1. Clark Univ., Worcester, MA (United States); Centre National de la Recherche Scientifique (CNRS), Paris (France)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Centre National de la Recherche Scientifique (CNRS), Paris (France)
  4. Clark Univ., Worcester, MA (United States)
Publication Date:
Research Org.:
Clark Univ., Worcester, MA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1505725
Alternate Identifier(s):
OSTI ID: 1101580
Grant/Contract Number:  
FG02-02ER15367
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Additional Journal Information:
Journal Volume: 86; Journal Issue: 4; Journal ID: ISSN 1539-3755
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Berhanu, Michael, Petroff, Alexander, Devauchelle, Olivier, Kudrolli, Arshad, and Rothman, Daniel H. Shape and dynamics of seepage erosion in a horizontal granular bed. United States: N. p., 2012. Web. doi:10.1103/physreve.86.041304.
Berhanu, Michael, Petroff, Alexander, Devauchelle, Olivier, Kudrolli, Arshad, & Rothman, Daniel H. Shape and dynamics of seepage erosion in a horizontal granular bed. United States. doi:10.1103/physreve.86.041304.
Berhanu, Michael, Petroff, Alexander, Devauchelle, Olivier, Kudrolli, Arshad, and Rothman, Daniel H. Wed . "Shape and dynamics of seepage erosion in a horizontal granular bed". United States. doi:10.1103/physreve.86.041304. https://www.osti.gov/servlets/purl/1505725.
@article{osti_1505725,
title = {Shape and dynamics of seepage erosion in a horizontal granular bed},
author = {Berhanu, Michael and Petroff, Alexander and Devauchelle, Olivier and Kudrolli, Arshad and Rothman, Daniel H.},
abstractNote = {We examine erosion patterns observed in a horizontal granular bed resulting from seepage of water motivated by observation of beach rills and channel growth in larger scale land forms. Our experimental apparatus consists of a wide rectangular box filled with glass beads with a narrow opening in one of the side walls from which eroded grains can exit. Quantitative data on the shape of the pattern and erosion dynamics are obtained with a laser-aided topography technique.We report that the spatial distribution of the source of groundwater can significantly impact the shape of observed patterns. An elongated channel is observed to grow upstream when groundwater is injected at a boundary adjacent to a reservoir held at constant height. An amphitheater (semicircular) shape is observed when uniform rainfall infiltrates the granular bed to maintain a water table. Bifurcations are observed as the channels grow in response to the groundwater. We further find that the channels grow by discrete avalanches as the height of the granular bed is increased above the capillary rise, causing the deeper channels to have rougher fronts. The spatiotemporal distribution of avalanches increase with bed height when partial saturation of the bed leads to cohesion between grains. Yet, the overall shape of the channels is observed to remain unaffected indicating that seepage erosion is robust to perturbation of the erosion front.},
doi = {10.1103/physreve.86.041304},
journal = {Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics},
number = 4,
volume = 86,
place = {United States},
year = {2012},
month = {10}
}

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Cited by: 8 works
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    Works referencing / citing this record:

    Viewing Earth’s surface as a soft-matter landscape
    journal, October 2019


    Granular bed consolidation, creep, and armoring under subcritical fluid flow
    journal, July 2018