Understanding Transport-Limited Slopes

The term "transport-limited" describes slopes where the rate at which weathered material can be moved downslope (transport) is the primary factor controlling the overall process. It means the slope's capacity to transport material is less than the rate at which material is being produced or could potentially be moved.

Process Rates on Limited Slopes

• Weathering: This is the process where rocks and minerals break down into smaller pieces or dissolve.
• Transport: This is the movement of weathered material downslope via processes like creep, slumping, or flow.
• Transport Limitation: When transport is limited, material may not be removed as quickly as it weathers.

Reasoning for Higher Weathering

On a transport-limited slope, the bottleneck is the removal of material. If weathering processes create debris faster than it can be transported away, the material effectively sits on the slope for longer periods.

• This prolonged exposure allows weathering more time to act on the material.
• Therefore, the relative rate or effectiveness of weathering increases compared to the rate of transport.
• While erosion and mass movement are related, the fundamental process driving the *availability* of material, under transport limitation, is often enhanced weathering or weathering appears higher relative to the slow removal rate.

Thus, on slopes limited by transport capacity, weathering is considered to be higher.