Tests whether the profile shows fluvic material features: alternating textures across consecutive horizons within the upper 100 cm AND an irregular (non-monotone) organic carbon pattern with depth. Diagnostic of Fluvisols.
Arguments
- pedon
A
PedonRecord.- max_top_cm
Maximum top depth (cm) considered (default 100).
- min_clay_swing
Minimum absolute clay-percent change between consecutive layers required to count as alternation (default 8 percentage points).
Details
Sub-test: test_fluvic_stratification.
v0.3 limitations: WRB 2022 fluvic material also requires age (typically <100 years for sediment freshness), which v0.3 does not check (no temporal fields in the schema). The stratification proxy is conservative – truly heterogeneous floodplain profiles with dramatic texture swings will pass; subtle alluvial sequences may miss. v0.4 will refine.