The slope replacement model is a geomorphological concept explaining the evolution of landform slopes over time.
This model was propounded by Albrecht Penck.
Penck's theory suggests that different slope segments transform into gentler slopes through weathering and erosion as a landscape ages.
Key contributions in geomorphology include Davis's Cycle of Erosion and Strahler's stream ordering system, but Penck is specifically credited with the slope replacement model.