A set of MATLAB functions to model how luminescence evolves in different geomorphic scenarios. Specifically, exposures to heat and sunlight can be simulated and the resulting signals shown. For a detailed description of the underlying luminescence rate equations, or to cite your use of LuSS, please use Brown, (2020).
- Three worked examples
- Functions to manipulate a sample
- Functions to plot a sample's luminescence signal
- Other functions
- Reference
Three worked examples are included to illustrate function usage. Example1.m simulates a quartz grain wandering across a landscape, experiencing sunlight, wildfire heat, burial, and stream residence. Example2.m simulates a feldspar grain within a cobble that exhumes and is exposed to sunlight, first on the ground surface and then beneath water. Example3.m simulates a rock exposed to wildfire heat.
After creating a sample as a data structure:
sample=struct;the functions listed below manipulate that sample.
| Function | Usage |
|---|---|
makeSampleQuartz.m |
Assign luminescence characteristics of quartz to sample. |
makeSampleFeldspar.m |
Assign luminescence characteristics of K-feldspar to sample. |
makeSampleCobble.m |
Adds depth to a sample. By default, a sample is defined as a grain, for which inward diffusion of light and heat is neglected. |
makeCobbleIntoGrain.m |
Removes depth from a sample. The luminescence signal from the outermost cobble shell is assigned to the grain. |
fillTraps.m |
Sets the fractional saturation (n/N) of the sample's luminescence signal to one. For cobbles, this applies to all depths. |
emptyTraps.m |
Sets the fractional saturation (n/N) to zero. |
| Function | Usage |
|---|---|
sunlightExposure.m |
Expose a cobble or grain to sunlight. |
underwaterSunlightExposure.m |
Expose a cobble or grain to sunlight attenuated by water. |
darkGrainHeatExposure.m |
Expose a grain to heat but not sunlight. |
rateEqn.m |
Expose a cobble or grain to heat or sunlight (with or without rock or water attenuation). This function is called by the previous three functions. |
| Function | Usage |
|---|---|
nN_t_plot.m |
Plots fractional saturation (n/N) as a function of time. Use for grains. |
nN_t_d_3dplot.m |
Plots fractional saturation (n/N) as a function of time and cobble depth. Use for cobbles. |
nN_final_t_plot.m |
Plots fractional saturation (n/N) as a function of cobble depth at the final timestep. Use for cobbles. |
appAge_t_plot.m |
Plots apparent age (ka) as a function of time. Use for grains. |
appAge_t_d_3dplot.m |
Plots apparent age (ka) as a function of time and cobble depth. Use for cobbles. |
appAge_final_t_plot.m |
Plots apparent age (ka) as a function of cobble depth at the final timestep. Use for cobbles. |
All other functions included in the repository are dependencies that should be kept in the same directory as the other files, but will not ordinarily be directly used.
splinefit.m is copyright 2009, Jonas Lundgren. All rights reserved. Retrieved from MATLAB Central File Exchange in 2019.
zroots.m is modified from:
Recktenwald, G., 2006. Transient, one-dimensional heat conduction in a convectively cooled sphere, Portland State University, Dept. of MME.
[Brown, N.D., 2020.] Which geomorphic processes can be informed by luminescence measurements? in press at Geomorphology.
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