Blue Ridge Escarpment Drainage Divide Retreat Code

The data and code in this repository was developed for publication in the manuscript: 

Stokes, MF, Larsen, IJ, Goldberg, SL, McCoy, SW, Prince, PP, & Perron, JT, The erosional signature of drainage divide motion along the Blue Ridge escarpment, JGR: Earth Surface (in review in October, 2022)

There are four main directories in the repository. 

Directory 1: Cosmogenics

Includes Table S1 and S2 in the manuscript which report sample locations, 10-Be concentrations, and modelled erosion rates. Also includes data and parameters used in LSDTopotools (Mudd et al. 2016, ESurf) (https://lsdtopotools.github.io/) to prepare the input data for the online erosion rate calculator formerly known as CRONUS (Balco et al., 2008, Geochronology) (https://hess.ess.washington.edu/). 

Directory 2: MapData

All digital elevation models and shapefiles used for topographic analyses. This directory is not needed to run the river long-profile models or to examine the erosion rate results. However, if interested in exactly reproducing our results and following our topographic analyses, this directory will be necessary.

Directory 3: TopographicAnalysis

Scripts used to analyze topography and create most of the figures in the manuscript. The scripts in this folder use TopoToolbox.  TopoToolbox Schwanghart, W., Scherler, D. (2014): TopoToolbox 2 – MATLAB-based software for topographic analysis and modeling in Earth surface sciences. Earth Surface Dynamics, 2, 1-7. [DOI: 10.5194/esurf-2-1-2014]

Directory 4: Simulations 

Code used for numerical models of the topographic evolution of river long-profiles following river capture. It is not necessary to download the data in MapData to get started with the simulation code. Scripts to replicate the experiments in our paper can be found in the sub-directories "DanSimulations" and "RoaSimulations".  Toy results are deposited in the directories "RoanokeSimulationResults" and "DanSimulationResults". 

The functions used in the simulations are in the subdirectory "LongProfileCode".  If LongProfileCode is used in work that results in publication please cite one of the following papers in which the MIT Geomorphology landscape evolution model (Tadpole) was developed:

Perron, J.T., W.E. Dietrich and J.W. Kirchner (2008), Controls on the spacing of first-order valleys. Journal of Geophysical Research, 113, F04016, doi: 10.1029/2007JF000977.

Perron, J.T., J.W. Kirchner and W.E. Dietrich (2009), Formation of evenly spaced ridges and valleys. Nature, 460, 502–505, doi: 10.1038/nature08174.