• Secchi disk measurements in turbid water 

      Bowers, David George; Roberts, Emyr Martyn; Hoguane, António Mubango; Fall, Kelsey A.; Massey, Grace M.; Friedrichs, Carl T. (Journal article; Peer reviewed, 2020)
      In the classical theory of the Secchi disk depth, diffuse sunlight falling on the disk is reflected back to the observer's eye along the most direct route, as a beam. The disappearance depth, ZSD, of the disk is then ...