Modelling drainage headwater development

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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.