水利学报2017，Vol.48Issue(12)：1482-1489,8.DOI:10.13243/j.cnki.slxb.20170312
干燥再淹没对细颗粒床沙磷吸附特性的影响研究
Effects of drying and re-flooding on phosphorus adsorption characteristic of fine bed sediment
摘要
Abstract
Water-level fluctuations cause drying and re-flooding of river bed sediment,which could change the adsorption characteristic of sediment.Fine bed sediment (＜ 31 μm) was taken from Huaihe River,and the change of particle size after air-drying was measured.In order to study the effects of drying and re-flooding on phosphorus adsorption characteristic of fine bed sediment,the batch equilibrium experiments were conducted on wet and dried sediments under different oscillation intensity.The results show that the dried sediment has a lower adsorption capacity and a higher EPC0 than wet sediment,which makes the bed sediment tend to be phosphorus source to water.In drying process,fine particles aggregate into micro-aggregate,which cause the significant difference between wet and dried sediment.The micro-aggregate breakdown with increasing hydrodynamic intensity increased the phosphorus adsorption capacity of dried sediment.Therefore,water-level fluctuation is unneglectable for the evaluation on phosphorus adsorption characteristic of bed sediment.关键词
干燥再淹没/微团聚体/磷吸附/振荡强度Key words
drying and re-flooding/micro-aggregate/phosphorus adsorption/oscillation intensity分类
建筑与水利引用本文复制引用
李青霞,唐洪武,袁赛瑜..干燥再淹没对细颗粒床沙磷吸附特性的影响研究[J].水利学报,2017,48(12):1482-1489,8.基金项目
国家自然科学基金项目(51239003,51509073) （51239003,51509073）
