🌱 Soil Moisture by TDR: Probe Travel Time, Reflections and the Topp Curve (2D profile)

2D soil profile with a time-domain reflectometry probe. Set the water content of two soil horizons, the interface depth, probe length, cable, salinity loss and instrument rise time, and read the simulated reflection trace, apparent permittivity and Topp-equivalent water content. Same transmission-line model as the 3D page, with four in-page numerical checks.