simple salt model
This repo contains code and data related to a simple differential equation model of salt concentrations in lakes and their watersheds.
The main script is 'salt wrapper.r'. Mostly this wrapper script works with the anlyitcal equilibrium solutions of the model, but it also calls 'dSalt.r', which defines the differential equations, to do some dynamic simulations.
The 'plot Mirror Lake data.r' script plots empirical data on salt concentrations in Mirror Lake, NH, by loading data from EDI.
Predict the equilibrium road salt concentration for all lakes larger than 1 ha in the contiguous United States. Model results can be found in 4_LAGOSModelOutput/saltModeloutput_LAGOS.zip
Watershed (n = 477,965), networked watersheds (n = 25,531), and lake data (in data/LAGOS) were obtained from LAGOS locus (Cheruvelil et al. 2021). See https://lagoslakes.org/lagos-us-overview/
Annual gridded 1-km2 data on road salt application rates were obtained from Falcone et al. (2018). See https://www.usgs.gov/data/estimates-road-salt-application-across-conterminous-united-states-1992-2015
Precipitation and actual evapotranspiration were obtained from HydroSHEDS and HydroATLAS, a global dataset of hydro-environmental characteristics (Lehner et al. 2022) See https://www.hydrosheds.org/hydroatlas