Canopy modeling of aquatic vegetation: A radiative transfer approach

Aquatic vegetation in shallow waters can absorb nitrogen and phosphorus from eutrophic waters, and effectively control water bloom. However, our knowledge of the interaction between solar radiation and aquatic vegetation is limited. This restricts the protection of aquatic vegetation. This paper proposes a radiative transfer approach for homogeneous aquatic vegetation canopy, based on the theories for terrestrial vegetation and Case II water. The effects of rough water surface and bottom reflection are also taken into consideration. Validations against an independent Monte Carlo model and field experiment data exhibit well consistencies on the bidirectional reflectance of homogeneous aquatic vegetation canopy. As expected, the results for sparse canopy degenerate. This model can be used for canopy modeling of emergent, floating or submerged aquatic vegetation. Potential applications include retrieval of biophysical or biochemical parameters based on hyperspectral data and physical process.