Morphology of the Tugaru Zyûniko Lake Group (1), Limnological Studies of the Tugaru Zyûniko Lake Group (1)

Yoshimura, Shinkichi; Koba, Keisuke; Obara, Noboru; Nagatu, I.

doi:10.4157/grj.10.968

Cited by 2 publications

(2 citation statements)

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“…Ao-ike Pond has a basin shape like a funnel, which was reported by Yoshimura et al [20]. The present authors recognize that the shape is actually more like a quadrangular pyramid than a simple funnel type.…”

Section: Study Areasupporting

confidence: 77%

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A Study on the Blue Coloration of Ao-ike Pond, Aomori Prefecture, Japan: Formulation of a Physical Model in Terms of Radiance and Image Analyses

Hanaishi

Chikita

2021

Applied Sciences

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The blue coloration model of a closed pond, Ao-ike Pond, Aomori Prefecture, Japan, was formulated in terms of radiance by applying a theory of observation devices proposed by Szirmay-Kalos (2008) and Hanaishi’s reverse ray tracing method. In this model, three potential contributions to the coloration were considered; irregular reflection at the Lambertian pond bottom, density fluctuation scattering by water, and Mie scattering by suspended solids. By utilizing model formulas for these mechanisms, some parameters were determined in order to duplicate the images of the pond surface without solar shading by tree leaves above the pond surface, in addition to the images with sunbeam trajectories by solar radiations passing through tree leaves, which are emitted from the water and visible on the surface. Simulating the pictures of the pond surface and the sun-beam-image analyses revealed that the blue colorations of Ao-ike Pond are mainly produced (1) by the density fluctuation scattering of water itself and the white Mie scattering by suspended solids and (2) by the red-light absorption by water in the optical paths before and after the two scatterings. Then, the density fluctuation scattering of water and the Mie scattering by suspended solids ex-hibited contributions of almost equal magnitude. The contribution of irregular reflections at the pond bottom was judged to be relatively small.

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Section: Study Areasupporting

confidence: 77%

“…Figure 1 shows a picture of Ao-ike Pond taken at 10:20 (JST) on 5 June 2021. The pond is 8.8 m deep at maximum and fully transparent with a 125 m-long shoreline [18,20]. Figure 2 shows the location of Ao-ike Pond and the surrounding pond group, called Juni-ko Lakes.…”

Section: Study Areamentioning

confidence: 99%

A Study on the Blue Coloration of Ao-ike Pond, Aomori Prefecture, Japan: Formulation of a Physical Model in Terms of Radiance and Image Analyses

Hanaishi

Chikita

2021

Applied Sciences

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A study on the coloration mechanism of Ao-ike Pond, Aomori Prefecture, Japan: refinement of the image analysis methods

Hanaishi,

Chikita

2023

Limnology

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Morphology of the Tugaru Zyûniko Lake Group (1), Limnological Studies of the Tugaru Zyûniko Lake Group (1)

Cited by 2 publications

References 0 publications

A Study on the Blue Coloration of Ao-ike Pond, Aomori Prefecture, Japan: Formulation of a Physical Model in Terms of Radiance and Image Analyses

A Study on the Blue Coloration of Ao-ike Pond, Aomori Prefecture, Japan: Formulation of a Physical Model in Terms of Radiance and Image Analyses

A study on the coloration mechanism of Ao-ike Pond, Aomori Prefecture, Japan: refinement of the image analysis methods

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