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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
<meta name="description" content="Sediment Transport Geological Scale">
<meta name="author" content="Tristan Salles">
<title>SgFm - Sediment Transport @ Geological Scale</title>
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<span style="font-family:Montserrat; font-size:17px; font-weight:normal;">Lecode Overview</a></span></li>
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<a href="#overview">OVERVIEW</a>
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<a href="#flowcomp">FLOW COMPUTATION</a>
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<span class="name">Lecode</span>
<span class="skills">In a Nutshell</span>
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<h2>Overview</h2>
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<p>
<strong>Lecode</strong> is a new numerical approach for simulating geomorphic and stratigraphic processes that combines open-channel
flow with non-uniform sediment transport law, and semi-empirical diffusive mass wasting.
</p>
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<img src="figures/appli.png" class="img-responsive img-centered" alt="">
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<p>
The model is designed to facilitate modelling of surface processes across multiple space and time scales, and under a variety
of environmental and tectonic conditions.
</p>
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<h3>In depth ...</h3>
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<p>
A more detailed explanation of <strong>Lecode</strong> physics, algorithms and implementation is available in a paper from Salles & Duclaux (Geomorphology).
</p>
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<h2>Flow computation</h2>
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<p>
To start with, you may have a look at this <a href="http://tristan-salles.github.io/SGFM-website/" target="_blank">Lecode Presentation</a> which gives a 6 slide
general overview of <strong>Lecode</strong> current capability.
</p>
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<p>
<br>
The physics of open-channel flow is primarily based on an adapted Lagrangian formulation of shallow-water equations. The interaction between
flow and surface geology is performed by a non-uniform total-load sediment transport law. Additional hillslope processes are simulated using a
semi empirical methods based on a diffusion approach.
<br>
In <strong>Lecode</strong>, the resolution of flow dynamics is made on a triangulated grid automatically mapped and adaptively remeshed
over a regular orthogonal stratigraphic mesh. These new methods reduce computational time while preserving stability and accuracy of the physical
solutions.
</p>
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<h2>Additional processes</h2>
<br>
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<h3>Porosity & compaction</h3>
</div>
</div>
<div class="row">
<div class="col-lg-12 text-left">
<p>
<strong>Lecode</strong> models sediments compaction and the evolution of porosity and through time. The concept relies on the principle that both grain stress and pore pressure support the load of the overlying volume of rock. The model assumes that an increasing lithostatic pressure causes a decrease in porosity.
</p>
</div>
</div>
<div class="row">
<div class="col-lg-12">
<h3>Mass wasting</h3>
</div>
</div>
<div class="row">
<div class="col-lg-12 text-left">
<p>
Mass wasting encompasses different processes such as landslide, debris flow or slump.
<br>
</p>
</div>
</div>
<div class="row">
<div class="col-xs-10 col-xs-offset-1">
<img src="figures/masswasting.png" class="img-responsive img-centered" alt="">
</div>
</div>
<div class="row">
<div class="col-lg-12 text-left">
<p><br>
For mass wasting, <strong>Lecode</strong> considers a simplified approach that is not highly parameter dependant and that can provide
first order mass wasting impacts at regional scale with minimum data requirements.
<br>
The method consists in:<br><br>
<span class="glyphicon glyphicon-ok-sign" style="vertical-align:center; font-size:15px;"></span> assessing the region prone to mass wasting (conditional threshold), <br>
<br><span class="glyphicon glyphicon-ok-sign" style="vertical-align:center; font-size:15px;"></span> estimating the volume of sediment based on mass wasting susceptibility map, and <br>
<br><span class="glyphicon glyphicon-ok-sign" style="vertical-align:center; font-size:15px;"></span> propagating the sediment on the downslope areas using a diffusive approach.
<br>
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