中文摘要：

水体中悬浮泥沙颗粒是氮、磷等营养元素在水中迁移转化的重要载体,已有的泥沙颗粒吸附研究多是针对污染物浓度较高的水体,较低水体中研究较少。因此,选择水体富营养化限制因子TP作为研究对象,根据香溪河泥沙含量及粒径分析结果,利用香溪河原水配取不同TP浓度的水样以及速度可控的搅拌装置模拟间歇性水流紊动,通过室内实验探讨低浓度水体中泥沙吸附机理。结果表明：在存在间歇扰动条件下,低TP浓度水体中达到吸附解吸平衡时间为5d左右,远慢于高浓度水样中的8h左右;单位泥沙吸附量与时间（单位为d）呈对数曲线关系,与水样中初始TP浓度基本呈线性关系;在无外界输入源或外界输入源可以忽略时,不考虑水体含沙量随时间变化,单位泥沙吸附量与水样中瞬时TP浓度呈线性关系。

英文摘要：

The suspended silt is the important carrier of the transformation and transportation to the main restricted factors in the eutrophic water bodies,such as nitrogen and phosphorus.The previous researches about the adsorption of silt have mostly been focused on the water bodies with high pollution concentration,while few studies was concentrated on the water bodies with low pollution contents.Aiming at this problem,based on the analyzed results of the silt content and diameter, the water from the Xiangxi River was used to prepare different concentration water samples.The intermittent water flow turbulence was simulated by means of the agitator implement with the controlled velocity.The experiments in the laboratory were conducted to analyze the adsorption rule in the water bodies with the low TP concentration.The results showed that while the intermittent turbulence exists,the time to reach the equilibrium state of absorptiondesorption in the water bodies with the lower pollution concentrations is about 5 days,which is much slower than that in the water bodies with the higher pollution concentrations（up to 8 hours）.The relation between the absorption quantity of per unit quality silt and days can be presented as the natural logarithm and the relation between the absorption quantity of per unit quality silt and the initial TP concentrations in the water sample can approximately be expressed as the linear.The relation between the absorption quantity of per unit quality silt and the instantaneous TP concentrations in the water sample can be represented as linear if the outer source（release or assimilation） and the variation of the silt content in the water bodies with the time was negelected.