Understanding Braided Stream Deposition: Diaras

The question asks to identify the landform resulting from the deposition of coarse alluvium by a braided stream on a gently sloping surface.

Identifying Diaras Landforms

A 'diara' is a term often used for alluvial plains or river islands formed by the deposition of river sediments. This description closely matches the scenario:

• Braided Stream Dynamics: Braided streams feature multiple, shifting channels and extensive sandbars or islands, indicating significant deposition.
• Coarse Sediment Deposition: These streams commonly carry and deposit coarser materials like sand and gravel.
• Gentle Slope Accumulation: Deposition processes create accumulations where the stream gradient lessens, forming features like diaras on gently sloping land.

Distinguishing from Other Options

Let's consider why other options are less fitting:

• Sand bar: Typically a smaller, submerged or exposed ridge of sand within a river channel.
• Alluvial fan: Forms at the point where a stream exits a narrow valley onto a wider, flatter area, often having a distinct fan shape and typically associated with steeper initial slopes than implied.
• Bajada: A broad slope formed by the merging of multiple alluvial fans at the base of mountains.

The specific combination of a braided stream, coarse alluvium, and a gentle slope points towards the formation of diaras.