Lake Thermal Stratification & Hydrochemistry Lab (2D)

This 2D companion goes past the 3D version's single well-mixed water box to model a real limnological phenomenon: a lake splits into a warm, wind-mixed epilimnion at the surface and a colder, isolated hypolimnion below the thermocline, and that split — set live here by a wind-mixing slider alongside temperature — decides whether the oxygen debt from decomposing algae reaches the surface or crashes to zero at the bottom. A depth-profile cross-section colors each layer by its own dissolved-oxygen level and traces the thermocline boundary, while a new water-hardness slider (fixed in the 3D version) now visibly changes how hard the carbonate buffer resists pH swings from the same nutrient load.