Influence of ship shadow on underwater irradiance fields

Y. Saruya; Tomohiko Oishi; Motoaki Kishino; Yasuhisa Jodai; K. Kadokura; Akihiko Tanaka

doi:10.1117/12.266397

6 February 1997 Influence of ship shadow on underwater irradiance fields

Y. Saruya, Tomohiko Oishi, Motoaki Kishino, Yasuhisa Jodai, K. Kadokura, Akihiko Tanaka

Proceedings Volume 2963, Ocean Optics XIII; (1997) https://doi.org/10.1117/12.266397
Event: Ocean Optics XIII, 1996, Halifax, Nova Scotia, Canada

Abstract

The underwater irradiance measurements are usually carried out from a ships, so that it is easy to imagine hat the data is affected by the shadow due to a ship. The simple algorithm to compute the 3D underwater irradiance fields was developed based on the forward Monte Carlo method, by assuming that the infinitely thin and totally absorbing disk exists at the air-sea interface. The model was confirmed by the field experiment, and found the good agreement with observed irradiance fields. According to the computations, it was found that the influence of the shadow on downward and upward irradiances appear in different manner. That is, the downward irradiance affected by the disk appears in downward with respect to the direction of the direct of the sunlight. On the other hand, it appears in upward in the case of upward irradiance. As the result, it is predicted that the overestimate and underestimate regions of irradiance reflectance are formed.

Citation Download Citation

Y. Saruya, Tomohiko Oishi, Motoaki Kishino, Yasuhisa Jodai, K. Kadokura, and Akihiko Tanaka "Influence of ship shadow on underwater irradiance fields", Proc. SPIE 2963, Ocean Optics XIII, (6 February 1997); https://doi.org/10.1117/12.266397

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