Imprints in silica grains induced during an open-channel flow experiment: Determination of microtextural signatures during aqueous transport

Pedro J.M. Costa (Lead / Corresponding author), Yong Sung Park, Young Do Kim, Maria Quintela, William C. Mahaney, Francisco Dourado, Sue Dawson

Research output: Contribution to journalArticle

4 Citations (Scopus)
124 Downloads (Pure)

Abstract

The aim of this work is to identify and characterize microtextural signatures in silica glass grains (used as analogous to quartz) that are produced during aqueous transport at different flow velocities, with variable sediment concentrations, transport distances, and time intervals. To achieve this, an open-channel flow experiment was conducted with a mixture of sand and silica glass microspheres in varying conditions-velocity (from 0.67 to 1.4 m/s), duration (1 or 10 minutes), distance (0 to 2.5 m) and sediment concentration (60 or 80%). Experimental conditions were used to replicate natural phenomena such as river superficial velocity or coastal swash processes. Before the experiment the microsphere surfaces were imaged and clear of any microtextural imprint. Increasing velocity, distance, and sediment concentration exhibited a strong correlation with higher numbers of surfaces abundantly covered with microtextures of mechanical origin (i.e., craters, abrasion marks, and v-shaped percussion marks). SEM microphotographs of silica were analyzed and classified to provide examples of the specific microtextures produced during the open-channel flow experiment. The purpose of the experiment was to characterize surface microscopic signatures in quartz grains replicating hydrodynamic conditions of coastal and fluvial environments. The results demonstrated a strong correlation between higher velocities (and higher sediment concentrations) and a larger presence of microtextural mechanical imprints in the grains analyzed, thus demonstrating a clear relation between microtextural imprints and water flow modes. These results have important implications for future microtextural works analyzing grain imprints and their relation to sediment transport types. An example demonstrated here is that the higher presence of v-marks could be used as an indicator of supercritical flow conditions.

Original languageEnglish
Pages (from-to)677-687
Number of pages11
JournalJournal of Sedimentary Research
Volume87
Issue number7
DOIs
Publication statusPublished - 11 Jul 2017

Fingerprint

open channel flow
silica
sediment
experiment
glass
quartz
supercritical flow
wave runup
abrasion
flow velocity
crater
sediment transport
water flow
hydrodynamics
scanning electron microscopy
sand
river

Cite this

Costa, Pedro J.M. ; Park, Yong Sung ; Kim, Young Do ; Quintela, Maria ; Mahaney, William C. ; Dourado, Francisco ; Dawson, Sue. / Imprints in silica grains induced during an open-channel flow experiment : Determination of microtextural signatures during aqueous transport. In: Journal of Sedimentary Research. 2017 ; Vol. 87, No. 7. pp. 677-687.
@article{60fe186c6922443d83b8779d51823e8d,
title = "Imprints in silica grains induced during an open-channel flow experiment: Determination of microtextural signatures during aqueous transport",
abstract = "The aim of this work is to identify and characterize microtextural signatures in silica glass grains (used as analogous to quartz) that are produced during aqueous transport at different flow velocities, with variable sediment concentrations, transport distances, and time intervals. To achieve this, an open-channel flow experiment was conducted with a mixture of sand and silica glass microspheres in varying conditions-velocity (from 0.67 to 1.4 m/s), duration (1 or 10 minutes), distance (0 to 2.5 m) and sediment concentration (60 or 80{\%}). Experimental conditions were used to replicate natural phenomena such as river superficial velocity or coastal swash processes. Before the experiment the microsphere surfaces were imaged and clear of any microtextural imprint. Increasing velocity, distance, and sediment concentration exhibited a strong correlation with higher numbers of surfaces abundantly covered with microtextures of mechanical origin (i.e., craters, abrasion marks, and v-shaped percussion marks). SEM microphotographs of silica were analyzed and classified to provide examples of the specific microtextures produced during the open-channel flow experiment. The purpose of the experiment was to characterize surface microscopic signatures in quartz grains replicating hydrodynamic conditions of coastal and fluvial environments. The results demonstrated a strong correlation between higher velocities (and higher sediment concentrations) and a larger presence of microtextural mechanical imprints in the grains analyzed, thus demonstrating a clear relation between microtextural imprints and water flow modes. These results have important implications for future microtextural works analyzing grain imprints and their relation to sediment transport types. An example demonstrated here is that the higher presence of v-marks could be used as an indicator of supercritical flow conditions.",
author = "Costa, {Pedro J.M.} and Park, {Yong Sung} and Kim, {Young Do} and Maria Quintela and Mahaney, {William C.} and Francisco Dourado and Sue Dawson",
note = "no funding info",
year = "2017",
month = "7",
day = "11",
doi = "10.2110/jsr.2017.39",
language = "English",
volume = "87",
pages = "677--687",
journal = "Journal of Sedimentary Research",
issn = "1527-1404",
publisher = "Society for Sedimentary Geology",
number = "7",

}

Imprints in silica grains induced during an open-channel flow experiment : Determination of microtextural signatures during aqueous transport. / Costa, Pedro J.M. (Lead / Corresponding author); Park, Yong Sung; Kim, Young Do; Quintela, Maria; Mahaney, William C. ; Dourado, Francisco; Dawson, Sue.

In: Journal of Sedimentary Research, Vol. 87, No. 7, 11.07.2017, p. 677-687.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Imprints in silica grains induced during an open-channel flow experiment

T2 - Determination of microtextural signatures during aqueous transport

AU - Costa, Pedro J.M.

AU - Park, Yong Sung

AU - Kim, Young Do

AU - Quintela, Maria

AU - Mahaney, William C.

AU - Dourado, Francisco

AU - Dawson, Sue

N1 - no funding info

PY - 2017/7/11

Y1 - 2017/7/11

N2 - The aim of this work is to identify and characterize microtextural signatures in silica glass grains (used as analogous to quartz) that are produced during aqueous transport at different flow velocities, with variable sediment concentrations, transport distances, and time intervals. To achieve this, an open-channel flow experiment was conducted with a mixture of sand and silica glass microspheres in varying conditions-velocity (from 0.67 to 1.4 m/s), duration (1 or 10 minutes), distance (0 to 2.5 m) and sediment concentration (60 or 80%). Experimental conditions were used to replicate natural phenomena such as river superficial velocity or coastal swash processes. Before the experiment the microsphere surfaces were imaged and clear of any microtextural imprint. Increasing velocity, distance, and sediment concentration exhibited a strong correlation with higher numbers of surfaces abundantly covered with microtextures of mechanical origin (i.e., craters, abrasion marks, and v-shaped percussion marks). SEM microphotographs of silica were analyzed and classified to provide examples of the specific microtextures produced during the open-channel flow experiment. The purpose of the experiment was to characterize surface microscopic signatures in quartz grains replicating hydrodynamic conditions of coastal and fluvial environments. The results demonstrated a strong correlation between higher velocities (and higher sediment concentrations) and a larger presence of microtextural mechanical imprints in the grains analyzed, thus demonstrating a clear relation between microtextural imprints and water flow modes. These results have important implications for future microtextural works analyzing grain imprints and their relation to sediment transport types. An example demonstrated here is that the higher presence of v-marks could be used as an indicator of supercritical flow conditions.

AB - The aim of this work is to identify and characterize microtextural signatures in silica glass grains (used as analogous to quartz) that are produced during aqueous transport at different flow velocities, with variable sediment concentrations, transport distances, and time intervals. To achieve this, an open-channel flow experiment was conducted with a mixture of sand and silica glass microspheres in varying conditions-velocity (from 0.67 to 1.4 m/s), duration (1 or 10 minutes), distance (0 to 2.5 m) and sediment concentration (60 or 80%). Experimental conditions were used to replicate natural phenomena such as river superficial velocity or coastal swash processes. Before the experiment the microsphere surfaces were imaged and clear of any microtextural imprint. Increasing velocity, distance, and sediment concentration exhibited a strong correlation with higher numbers of surfaces abundantly covered with microtextures of mechanical origin (i.e., craters, abrasion marks, and v-shaped percussion marks). SEM microphotographs of silica were analyzed and classified to provide examples of the specific microtextures produced during the open-channel flow experiment. The purpose of the experiment was to characterize surface microscopic signatures in quartz grains replicating hydrodynamic conditions of coastal and fluvial environments. The results demonstrated a strong correlation between higher velocities (and higher sediment concentrations) and a larger presence of microtextural mechanical imprints in the grains analyzed, thus demonstrating a clear relation between microtextural imprints and water flow modes. These results have important implications for future microtextural works analyzing grain imprints and their relation to sediment transport types. An example demonstrated here is that the higher presence of v-marks could be used as an indicator of supercritical flow conditions.

U2 - 10.2110/jsr.2017.39

DO - 10.2110/jsr.2017.39

M3 - Article

AN - SCOPUS:85026441545

VL - 87

SP - 677

EP - 687

JO - Journal of Sedimentary Research

JF - Journal of Sedimentary Research

SN - 1527-1404

IS - 7

ER -