What is the guidance for mapping and tagging geology and geologic/geomorphic features?

I am a geologist so I am trying to avoid overly technical jargon but need guidance on how to handle the mapping of geologic features, in particular the braidplain in a desert setting (Oman, Salalah region).

In the mountainous regions the intermittent rivers and streams are generally confined and can be easily represented by a line:river or intermittent stream. Once the channel spills out to a broad flat area the channels become highly interwoven and you are faced with either mapping the ever-changing individual channels OR creating an area. area:sand doesn’t really convey the feature and there doesn’t appear to be a tag for braidplain. Is anyone else experienced with how to resolve this?

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/what-is-the-guidance-for-mapping-and-tagging-geology-and-geologic-geomorphic-features/1316