期刊
MARINE POLLUTION BULLETIN
卷 77, 期 1-2, 页码 266-273出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2013.09.049
关键词
Nii-jima Island; Linear system analysis; Unit impulse response; Residence time; Diffusion equation; Mark-recapture experiment
资金
- Ministry of the Environment, Japan [B-1007]
- JSPS KAKENHI [23656309, 25820234]
- Grants-in-Aid for Scientific Research [25820234, 23656309] Funding Source: KAKEN
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据