Which mechanism causes meanders to form within a braided river?

💡 Explanation

Secondary flow induces helical motion in the water, because this transports sediment laterally eroding outer banks forming meanders, rather than uniform erosion. Therefore, secondary flow is critical, rather than uniform conditions inducing straight channels.

• Which long-term outcome arises after a river erodes the neck of an oxbow lake during annual floods?
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• Following a Plinian eruption, which effect is primarily determined by air entry during pyroclastic density current propagation?
• Which atmospheric outcome significantly reduces convective precipitation when persistent high pressure systems induce the subsidence effect?
• Which outcome occurs when glacial headwall freeze cracks within a cirque?