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FDS Source: assume plug flow in near-surface level set wind when not … #15557

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Merged
ericvmueller merged 1 commit into from
Nov 10, 2025
Merged

FDS Source: assume plug flow in near-surface level set wind when not … #15557

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4 changes: 2 additions & 2 deletions Source/vege.f90
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Original file line number Diff line number Diff line change
Expand Up @@ -430,9 +430,9 @@ SUBROUTINE LEVEL_SET_FIRESPREAD(T,DT,NM)
U_Z(2) = 0.5_EB*(U(IIG-1,JJG,KWIND)+U(IIG,JJG,KWIND))
V_Z(1) = 0.5_EB*(V(IIG,JJG-1,KWIND-1)+V(IIG,JJG,KWIND-1))
V_Z(2) = 0.5_EB*(V(IIG,JJG-1,KWIND)+V(IIG,JJG,KWIND))
! If wind comes from first grid cell assume zero wind at ground level
! If wind comes from first grid cell assume plug flow near ground level
IF (KWIND==1) THEN
U_Z(1) = 0._EB; V_Z(1) = 0._EB; ZWIND(1) = 0._EB
U_Z(1) = U_Z(2); V_Z(1) = V_Z(2); ZWIND(1) = Z_LS(IIG,JJG)
ENDIF
U_LS(IIG,JJG) = U_Z(1) + (REF_WIND_HEIGHT-ZWIND(1))/(ZWIND(2)-ZWIND(1))*(U_Z(2)-U_Z(1))
V_LS(IIG,JJG) = V_Z(1) + (REF_WIND_HEIGHT-ZWIND(1))/(ZWIND(2)-ZWIND(1))*(V_Z(2)-V_Z(1))
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