This study investigated the effect of rock fragments on tracer transport in broadleaved and coniferous forest soils from the 0 - 100 cm depth of Gongga Mountain in eastern margin of Qinghai Tibetan Plateau. Using repa...This study investigated the effect of rock fragments on tracer transport in broadleaved and coniferous forest soils from the 0 - 100 cm depth of Gongga Mountain in eastern margin of Qinghai Tibetan Plateau. Using repacked soil columns (20 cm in height and 10 cm in diameter) with different rock fragments contents (0%, 5%, and 15% in v/v), breakthrough curves of bromide (as non-reactive tracer) were obtained under saturated condition. A two-region model was applied and the parameters were estimated by inverse modeling. Results show that with increasing rock fragment content the dispersivity (<em>λ</em>) generally increased while the mobile-immobile partition coefficient (<em>β</em>) and the mass transfer coefficient (<em>ω</em>) decreased. The presence of rock fragments led to an increase in the fraction of immobile domain as well as soil tortuosity. A plausible explanation is that the soil beneath the rock fragments behaved as immobile domain and soil-rock interfaces could serve as preferential flow paths.展开更多
Polyester plastics such as poly(ethylene terephthal-ate)(PET)are utilized commonly in everyday life,yet only a small portion of these plastics are recycled,and typically,the recycling procedures face energy or polluti...Polyester plastics such as poly(ethylene terephthal-ate)(PET)are utilized commonly in everyday life,yet only a small portion of these plastics are recycled,and typically,the recycling procedures face energy or pollution problems.展开更多
文摘This study investigated the effect of rock fragments on tracer transport in broadleaved and coniferous forest soils from the 0 - 100 cm depth of Gongga Mountain in eastern margin of Qinghai Tibetan Plateau. Using repacked soil columns (20 cm in height and 10 cm in diameter) with different rock fragments contents (0%, 5%, and 15% in v/v), breakthrough curves of bromide (as non-reactive tracer) were obtained under saturated condition. A two-region model was applied and the parameters were estimated by inverse modeling. Results show that with increasing rock fragment content the dispersivity (<em>λ</em>) generally increased while the mobile-immobile partition coefficient (<em>β</em>) and the mass transfer coefficient (<em>ω</em>) decreased. The presence of rock fragments led to an increase in the fraction of immobile domain as well as soil tortuosity. A plausible explanation is that the soil beneath the rock fragments behaved as immobile domain and soil-rock interfaces could serve as preferential flow paths.
基金This work was supported financially by National Nature Science Foundation of China(NSFC)(nos.21622104,21701085,21871125,21871141,21871142,and 21901122)The National Science Foundation(NSF)of Jiangsu Province of China(no.BK20171032)+2 种基金the Natural Science Research of Jiangsu Higher Education Institutions of China(nos.17KJB150025 and 19KJB150011)Project funded by China Postdoctoral Science Foundation(nos.2018M630572 and 2019M651873)Priority Academ-ic Program Development of Jiangsu Higher Education Institutions and the Foundation of Jiangsu Collaborative Innovation Center of Biomedical Functional Materials.
文摘Polyester plastics such as poly(ethylene terephthal-ate)(PET)are utilized commonly in everyday life,yet only a small portion of these plastics are recycled,and typically,the recycling procedures face energy or pollution problems.
