| Abstract: | Processes operative in the divideward sections of streams and channels are reviewed, and the effects of their action over long periods of time are modelled for insight into long-term valley head development. Upper valley axis profiles eventually become concave upwards over time but may show earlier convexity and convexo-concavity. After any particular length of development different upper valley axis forms can exist in areas of different climate and hydrological response characteristics. |
