Currently it is set to DHSI * VHSI. This works if DHSI and VHSI are both binary, but for spawning VHSI is continuous [0, 1], resulting in significant over-estimate.
Update to sqrt(DHSI * VHSI) for a geometric mean -- this is the standard method of combining continuous HS indices, as in the Yuba report and others. An extra-conservative method would be min(DHSI, VHSI)
Likewise, for duration_apply_dhsi_to_fsa_curve, marigial addition of durwua should be sqrt(dhsi) * wua_added and marginal subtraction should be sqrt(cumgmean(dhsi)) * wua_removed
skylerlewis
commented
1 month ago
Fix
vector_dvhsi_spawningfunction definitionCurrently it is set to DHSI * VHSI. This works if DHSI and VHSI are both binary, but for spawning VHSI is continuous [0, 1], resulting in significant over-estimate.
Update to
sqrt(DHSI * VHSI)for a geometric mean -- this is the standard method of combining continuous HS indices, as in the Yuba report and others. An extra-conservative method would bemin(DHSI, VHSI)Likewise, for
duration_apply_dhsi_to_fsa_curve, marigial addition of durwua should besqrt(dhsi) * wua_addedand marginal subtraction should besqrt(cumgmean(dhsi)) * wua_removed