![Page 1: Modeling short-term hydrosedimentary processes and the preservation of river dune deposits Suzanne Leclair Montréal, QC, CANADA suzanneleclair@sympatico.ca](https://reader036.vdocuments.us/reader036/viewer/2022081503/56649d4c5503460f94a29e2a/html5/thumbnails/1.jpg)
Modeling short-term hydrosedimentary processes and the preservation of river dune deposits
Suzanne LeclairMontréal, QC, CANADA
Theory Experiment
![Page 2: Modeling short-term hydrosedimentary processes and the preservation of river dune deposits Suzanne Leclair Montréal, QC, CANADA suzanneleclair@sympatico.ca](https://reader036.vdocuments.us/reader036/viewer/2022081503/56649d4c5503460f94a29e2a/html5/thumbnails/2.jpg)
Modeled distributions of dune height and trough elevation based on observed dune migrating behaviour
(without sediment vertical sorting—and hence no constraint on dune scouring)
From Leclair , Sedimentology 2002)
Observations Results vs Simulation model
![Page 3: Modeling short-term hydrosedimentary processes and the preservation of river dune deposits Suzanne Leclair Montréal, QC, CANADA suzanneleclair@sympatico.ca](https://reader036.vdocuments.us/reader036/viewer/2022081503/56649d4c5503460f94a29e2a/html5/thumbnails/3.jpg)
From Leclair, 2006, GEOLOGY
Inverse modeling:Interpretation of sedimentary record
![Page 4: Modeling short-term hydrosedimentary processes and the preservation of river dune deposits Suzanne Leclair Montréal, QC, CANADA suzanneleclair@sympatico.ca](https://reader036.vdocuments.us/reader036/viewer/2022081503/56649d4c5503460f94a29e2a/html5/thumbnails/4.jpg)
-15
-10
-5
0
5
10
15
20
25
0 10000 20000 30000 40000
Distance (m)
Ele
vati
on
rel
ativ
e to
dat
um
(m
)Modeling the thickness of
preserved deposit from various hydrographical events at the
channel scale
Observed alongstream dune-bed elevations in the Mississippi River
Quaternary Loire
?
(Research program while at Tulane University– supported by the Board of Regents of Louisiana)
![Page 5: Modeling short-term hydrosedimentary processes and the preservation of river dune deposits Suzanne Leclair Montréal, QC, CANADA suzanneleclair@sympatico.ca](https://reader036.vdocuments.us/reader036/viewer/2022081503/56649d4c5503460f94a29e2a/html5/thumbnails/5.jpg)
18 m
5 km
![Page 6: Modeling short-term hydrosedimentary processes and the preservation of river dune deposits Suzanne Leclair Montréal, QC, CANADA suzanneleclair@sympatico.ca](https://reader036.vdocuments.us/reader036/viewer/2022081503/56649d4c5503460f94a29e2a/html5/thumbnails/6.jpg)
Predicting mean thickness of channel deposit --or erosion
bed elevation below 0, m02468
Fra
ctio
n o
f d
istr
ibu
tion
0.5
0.6
0.7
0.8
0.9
1.01st peak rising
2nd peak
falling
3.1 m
(1.3m)
1.5 m1 m(0.8 m)(0.9 m)
Preserved after 1 year
?