This modeling work is being used to support the design of our alfalfa-planted basalt column experiment associated with the Landscape Evolution Observatory, and it can help to understand our assumptions and ideally work around issues before they show up in the actual experiment. This modeling work allows for rapid preliminary testing of the theoretical relationships between plants, medium, and water content and investigation into what parameters might lead to the highest degree of differentiation between planted and non-planted basalt columns. The interrelationships between Richard’s equation (water flow through porous media), the Penman-Monteith equation (evapotranspiration), the Feddes model (root water uptake), and solute transport models are all involved in this work. The ultimate goal will be to establish a reasonable watering schedule for the physical experiment that investigates the effect of alfalfa on the water balance under both dry and wet conditions as the alfalfa grows and develops over several months.
