Classically, source criticism views the flood narrative as an amalgamation of two *independent* flood narratives--one from a Priestly source, the other from a non-Priestly source.
Linked below is a classic schema:
livius.org/articles/misc/…
the flood narrative was composed by a redactor who wove together two independent narratives,
First, they do not remove the (perceived) oddities they purport to be able to remove.
Or, to put the point another way, if the flood narrative of Gen. 6-9 has its oddities,
Consider, for instance, the sequence of events recounted in the Priestly narrative:
Noah does everything God commands him to, i.e., builds the ark, gathers up the animals, and (presumably) enters the ark (6.22);
and, after a further 7 days, we have another flood (7.11) and another occasion when Noah and the animals enter the ark (7.13).
In response, a source critic might tell us we simply need to read P’s narrative more sympathetically, e.g., as a block of summary statements which are later filled out.
But then why not just read the single flood narrative of Gen. 6-9 in such a manner?
Alternatively, a source critic might dismiss our concern as a minor wrinkle which does not detract from the overall success of the classic source critical approach.
And so the story continues.
But then why did our redactor not do so elsewhere?
And, if we say the sources beneath Gen. 6-9 have been substantially adapted, then in what sense are they really identifiable sources?
* Why is no-one commanded to build the ark in the non-P narrative?
* Why is no-one said to leave the ark in the non-P narrative? (Ostensibly, Noah builds an altar while he is still on board: 8.20.)
* Why, in P, is a raven--i.e., an unclean bird--the first creature to be released from the ark to enjoy a newly-purged post-flood world (8.7)?
Obviously, a brief thread can only scratch the surface of an issue.
But, for the reasons stated above, the classic source critical analysis of the flood narrative (as modelled by Von Rad, Vawter, Westermann, etc.) does not strike me as very fruitful.
but, ultimately, it fails to explain what it sets out to explain,
and seems to tell us more about our presuppositions than our object of study...
Evidently, ancient authors and readers didn’t expect texts to be structured and read in the way we do,
The end.