Small plastic debris changes water movement and heat transfer through beach sediments

被引：284

作者：

Carson, Henry S. ^{[1
]}

Colbert, Steven L. ^{[1
]}

Kaylor, Matthew J. ^{[1
]}

McDermid, Karla J. ^{[1
]}

机构：

[1] Univ Hawaii, Dept Marine Sci, Hilo, HI 96720 USA

来源：

MARINE POLLUTION BULLETIN | 2011年 / 62卷 / 08期

关键词：

Marine debris; Microplastic; Permeability; Porosity; Heat transfer; Kamilo Beach; Hawaii; USA; SANDY BEACHES; ACCUMULATION; NORTH; SEA; TEMPERATURES; ENVIRONMENT; FILTRATION; PATTERNS; TURTLES;

D O I：

10.1016/j.marpolbul.2011.05.032

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

We investigated the physical properties of beaches contaminated with plastic fragments. We compared sediment cores from Hawaii Island's Kamilo Beach, notable for plastic accumulation, to cores from a nearby beach. Compared to the nearby beach, Kamilo sediments contained more plastics (up to 30.2% by weight), were coarser-grained, and were more permeable (t-test, p < 0.0001). 85% of the fragments were polyethylene, and 95% were concentrated in the top 15 cm of the cores. We constructed artificial cores of standardized grain size and varying plastic-to-sediment ratios. Adding plastic significantly increased the permeability (ANOVA, p = 0.002), which was partially attributed to the fragments increasing the mean grain size. Sediments with plastic warmed more slowly (16% maximum decrease in thermal diffusivity), and reached lower maximum temperatures (21% maximum increase in heat capacity). These changes have a variety of potential effects on beach organisms, including those with temperature-dependent sex-determination such as sea turtle eggs. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：1708 / 1713

页数：6

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