文章摘要
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
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
投稿时间:2017-04-05  
DOI:10.13243/j.cnki.slxb.20170312
中文关键词: 干燥再淹没  微团聚体  磷吸附  振荡强度
英文关键词: drying and re-flooding  micro-aggregate  phosphorus adsorption  oscillation intensity
基金项目:国家自然科学基金项目(51239003,51509073)
作者单位
李青霞 河海大学 水文水资源与水利工程科学国家重点实验室, 江苏 南京 210098 
唐洪武 河海大学 水文水资源与水利工程科学国家重点实验室, 江苏 南京 210098 
袁赛瑜 河海大学 水文水资源与水利工程科学国家重点实验室, 江苏 南京 210098 
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中文摘要:
      河流水位变动会使部分床沙经历干燥再淹没,改变床沙吸附特性。本文选取淮河中游细颗粒床沙(<31 μm),通过对比原始湿沙和风干沙的粒径和不同振荡强度下的磷吸附特性,探究考虑水动力条件下干燥再淹没对细颗粒床沙吸附特性的影响。结果表明,湿沙干燥后吸附能力下降,零净吸附磷浓度(EPC0)增大,易成为磷释放源。湿沙在干燥过程中会黏聚形成微团聚体,再淹没后起悬条件发生改变。随着水动力强度的增大,微团聚体会发生分散,使水沙接触面积增大,导致干湿泥沙不同动力条件下吸附特征差异显著。水动力强度和初始磷溶液浓度越低,干湿泥沙吸附特征差异越显著。水位变动改变了床沙对磷的吸附特征,是评估床沙对水环境调节作用的重要因素。
英文摘要:
      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. Key words:drying and re-flooding;micro-aggregate;phosphorus adsorption;oscillation intensity
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