Journal
MARINE POLLUTION BULLETIN
Volume 77, Issue 1-2, Pages 266-273Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2013.09.049
Keywords
Nii-jima Island; Linear system analysis; Unit impulse response; Residence time; Diffusion equation; Mark-recapture experiment
Funding
- Ministry of the Environment, Japan [B-1007]
- JSPS KAKENHI [23656309, 25820234]
- Grants-in-Aid for Scientific Research [25820234, 23656309] Funding Source: KAKEN
Ask authors/readers for more resources
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 (tau(r) = 209 days) and can be described as functions of the ratio of tau(r) 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 tau(r) and the backshore width. Generally, D would depend on hydrodynamical statistics and beach geomorphology as well as the dimensions and density of the items. (C) 2013 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available