Which risk increases when Himalayan river discharge diminishes across an alluvial fan?

💡 Explanation

Channel avulsion risk increases because reduced discharge causes increased sediment deposition at the fan apex, triggering channel-switching by the mechanism of channel instability; therefore, sediment accumulates in old waterways, rather than distributing evenly, in new waterways.

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• Which long-term outcome results when sediment blocks tributary inflow to river-fed lakes?
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