wunder beta🌊 How a river carves a canyon
Follow gradient, floods, sediment, weathering, and tributaries as a river cuts down and widens a canyon.
What you’ll learn
- A river gets a cutting edgeExplain how base level, gradient, discharge, and sediment give a river power to incise bedrock.A river cuts downward when gravity moves water toward a lower base level; steep slope, flood discharge, and abrasive sediment make that cutting more effective.
- The river cuts down, the walls give wayConnect river incision with differential erosion and weathering of canyon walls.The channel deepens at the bed while contrasting rock layers, weathering, and gravity shape cliffs, ledges, and slopes above it.
- Side streams widen the gorgeShow how tributaries, flash floods, and migrating waterfalls expand a river-cut canyon laterally.Tributaries carry water and debris into the main gorge, cut side canyons, and widen the landscape through headward erosion and wall retreat.
- A canyon is a moving balanceUse sediment, terraces, and modern flow changes to interpret canyon growth as an ongoing process.Erosion exports sediment, terraces preserve former river levels, and present-day flow and weathering continue to reshape the canyon.
Questions this course answers
What gives a river a long-term reason to cut downward?
Downcutting continues while the river is above a lower base level and has a downhill path.
How do flood-carried boulders help carve a bed?
Large moving clasts strike and grind against the channel floor.
Why can one canyon layer form a cliff while another forms a slope?
Differential erosion leaves resistant layers standing and removes weaker layers faster.
What is weathering's role in canyon growth?
Weathering opens cracks and weakens material that can then fall or wash downslope.
Why do tributaries make a canyon wider?
Tributary floods erode their own channels and deliver sediment and debris to the main canyon.
What happens when a waterfall retreats upstream?
Plunge-pool erosion and collapse at the lip move the waterfall and channel head upstream.
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