河流水体中的含磷营养物质与较细颗粒的悬移质泥沙发生吸附作用,将对水质循环过程产生影响。基于拟合磷与泥沙颗粒吸附过程的Langmuir方程和修正Langmuir方程分别推导了计算颗粒态磷(PP)和溶解态磷(DP)的计算公式。并采用香溪河泥沙样品的磷吸附实验数据和野外观测数据验证了推导公式,计算结果与实测值符合良好。研究结果表明:当悬移质泥沙浓度较低时,可采用线性吸附方程近似计算颗粒态和溶解态磷浓度,但当悬移质泥沙浓度较高时,需要采用本研究推导的计算公式,特别是解吸和吸附现象并存时,需要使用基于修正的Langmuir模型推导的计算式。研究成果可用于水质或水生态模型建模。
Abstract
The adsorption-desorption between phosphorus and suspended sediment particles in rivers or lakes would influence the cycling process of water quality components. In this research, the calculation formulas for particulate phosphorus (PP) and dissolved phosphorus (DP) concentrations were deduced based on the classic Langmuir equation and the modified Langmuir equation, respectively. Furthermore, the experimental data and in-situ observed data of phosphorus and suspended sediment in Xiangxi River were used to verify the deduced formulas, and the calculated results were well consistent with the observed data. When suspended sediment concentration was low, the linear equation could work well, but when suspended sediment concentration was relatively high, the deduced formula needs be used, especially when adsorption and desorption coexisted, the formula deduced by modified Langmuir Equation needs be used. The research results could be applied for water quality and ecological modeling.
关键词
悬移质泥沙 /
颗粒态磷 /
溶解态磷 /
浓度 /
吸附-解吸 /
香溪河
Key words
suspended sediment /
particulate phosphorus /
dissolved phosphorus /
concentration /
adsorption-desorption /
Xiangxi River
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基金
国家自然科学基金青年基金项目(51309021)
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