[GRASS-git] [OSGeo/grass-addons] 10ff82: i.eb.hsebal95: fix numerical instability (#1779)

[Yann Chemin]

  Branch: refs/heads/grass8
  Home:   https://github.com/OSGeo/grass-addons
  Commit: 10ff827891cab2662485af7bb5f5830fa0d220c8
      https://github.com/OSGeo/grass-addons/commit/10ff827891cab2662485af7bb5f5830fa0d220c8
  Author: Yann Chemin <dr.yann.chemin at gmail.com>
  Date:   2026-09-15 (Tue, 15 Sep 2026)

  Changed paths:
    M src/imagery/i.eb.hsebal95/u_star.c

  Log Message:
  -----------
  i.eb.hsebal95: fix numerical instability (#1779)

* Update u_star.c

Known numerical limitation of Monin-Obukhov similarity theory at near-calm wind: operational SEBAL/METRIC implementations universally floor 2m wind speed at some minimum (commonly ~1.0 m/s) specifically to avoid this singularity, since the log-wind-profile assumptions themselves break down physically at near-zero wind.



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