Japan Archives - One Earth - One Ocean e. V. https://oneearth-oneocean.com/category/japan/ Sun, 22 Dec 2013 16:37:25 +0000 de-DE hourly 1 https://wordpress.org/?v=6.5.5 https://oneearth-oneocean.com/wp-content/uploads/2022/08/cropped-oeoo-logo-unterzeile-blau-1-32x32.jpg Japan Archives - One Earth - One Ocean e. V. https://oneearth-oneocean.com/category/japan/ 32 32 Analysis of a beach as a time-invariant linear input/output system of marine litter https://oneearth-oneocean.com/2013/2013/analysis-of-a-beach-as-a-time-invariant-linear-inputoutput-system-of-marine-litter/ https://oneearth-oneocean.com/2013/2013/analysis-of-a-beach-as-a-time-invariant-linear-inputoutput-system-of-marine-litter/#respond Sun, 22 Dec 2013 16:37:25 +0000 http://www.oneearth-oneocean.com/kb/?p=77 Tomoya Kataoka, Hirofumi Hinata, Shigeru Kato, Analysis of a beach as a time-invariant linear input/output system of marine litter, Marine Pollution Bulletin, Volume 77, Issues 1–2, 15 December 2013, Pages 266-273, ISSN 0025-326X, http://dx.doi.org/10.1016/j.marpolbul.2013.09.049. (http://www.sciencedirect.com/science/article/pii/S0025326X13006000) Abstract: The exponential decay of the amount of new litter on Wadahama Beach, Nii-jima Island, Japan revealed by 20-month mark-recapture experiments demonstrates a linear response of the beach to the input of target items. Here we show the amplitude and phase characteristics of the beach as a time-invariant linear input/output system and discuss the hydrodynamic and geomorphological factors that would determine the characteristics with the aid of a diffusion equation. The characteristics are fully determined by the residence time of the items (τr = 209 days) and can be described as functions of the ratio of τr to the period of input variability. The decay is reproduced well by the analytical solution of the equation with a constant diffusion coefficient (D), whose order was estimated by τr and the backshore width. Generally, D would depend on hydrodynamical statistics and beach geomorphology as well as the dimensions and density of the items. Keywords: Nii-jima Island; Linear system analysis; Unit impulse response; Residence time; Diffusion equation; Mark-recapture experiment

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]]> Tomoya Kataoka, Hirofumi Hinata, Shigeru Kato, Analysis of a beach as a time-invariant linear input/output system of marine litter, Marine Pollution Bulletin, Volume 77, Issues 1–2, 15 December 2013, Pages 266-273, ISSN 0025-326X, http://dx.doi.org/10.1016/j.marpolbul.2013.09.049. (http://www.sciencedirect.com/science/article/pii/S0025326X13006000) Abstract: The exponential decay of the amount of new litter on Wadahama Beach, Nii-jima Island, Japan revealed by 20-month mark-recapture experiments demonstrates a linear response of the beach to the input of target items. Here we show the amplitude and phase characteristics of the beach as a time-invariant linear input/output system and discuss the hydrodynamic and geomorphological factors that would determine the characteristics with the aid of a diffusion equation. The characteristics are fully determined by the residence time of the items (τr = 209 days) and can be described as functions of the ratio of τr to the period of input variability. The decay is reproduced well by the analytical solution of the equation with a constant diffusion coefficient (D), whose order was estimated by τr and the backshore width. Generally, D would depend on hydrodynamical statistics and beach geomorphology as well as the dimensions and density of the items. Keywords: Nii-jima Island; Linear system analysis; Unit impulse response; Residence time; Diffusion equation; Mark-recapture experiment

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