The gently sloping accumulation of coarse alluvium deposits by a braided stream is known as

The correct answer is Option B: alluvial fan.

In geomorphology, an alluvial fan is a cone-shaped or fan-shaped deposit of sediment formed where a stream leaves a mountain range and flows into a flatter plain. This change in gradient causes the stream to lose energy and deposit its load.

• Key Characteristics: The deposits typically consist of coarse alluvium (sand and gravel). The landform is described as a gently sloping accumulation.
• Association with Braided Streams: The streams flowing across alluvial fans are almost always braided (consisting of multiple interconnecting channels) due to the high sediment supply and variable discharge.

Why other options are incorrect:

• Sand bar (Option A): A sand bar (or braid bar) is a temporary ridge of sediment within a river channel. While braided streams contain sand bars, the term "gently sloping accumulation" refers to the broader landform (the fan) created by the stream, not the bars inside it.
• Bajada (Option C): A bajada is a continuous apron of sediment formed by the merging of multiple adjacent alluvial fans.
• Diaras (Option D): This is a regional term used in India for flood-prone islands or land located between river channels.