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在研究淤泥质河口、海岸的泥沙运动时,常会遇到没有固结的淤泥被卷入运动,因此,在港池、航道中产生了高浓度浑水的输移、沉积和冲刷。本文研究高浓度浑水的流变特性,着重分析含盐度和温度对流变参数的影响,得出流变参数的表达式,在此基础上,通过淤泥冲刷特性试验,建立了流变参数τ_B和起动摩阻流速μ*c的联系。利用流变研究成果,可估算港池、航道中由尚未固结向固结过渡的各种底床浓度(湿密度为1180～1350kg/m~3)淤泥的起动流速。此外,根据冲刷试验资料,应用含盐淤泥流变特性研究成果所提供的细颗粒泥沙的起动公式,对淤泥底床的冲刷率进行了验证,初步取得了良好的结果。
In the study of silt estuarine and coastal sediment movement, it is not uncommon to encounter unconsolidated silt being entrained into the movement. Therefore, transport and deposition of high concentration of muddy water and its erosion occur in the channel and the channel. In this paper, the rheological properties of high-concentration muddy water were studied. The influence of salinity and temperature on the rheological parameters was analyzed. The rheological parameters were obtained. Based on this, the rheological parameters τ_B And start the friction velocity μ * c contact. Based on the results of the rheological studies, it is possible to estimate the initial flow velocity of silt in various concentrations (wet density 1180 ~ 1350kg / m ~ 3) in the harbor basin and waterway from unconsolidated to consolidated transition. In addition, according to the scouring test data, the start formula of the fine sediment provided by the research results of the rheological properties of the salty silt is applied to verify the erosion rate of the silt bed, and good results have been achieved initially.