中文摘要：

为了研究河口海岸地区淤泥的运动规律,以天津塘沽地区淤泥为研究对象,采用理论分析与水槽实验相结合的方法,讨论了流变参数与密度之间的关系,总结出宾汉极限剪应力、粘滞系数与密度的关系均符合指数分布并给出关系式.研究了不同底床密度和水流条件下淤泥的起动及冲刷规律,得出淤泥的起动符合希尔兹曲线,随淤泥密度增大,起动流速相应加大;随着水深不断减小,底泥起动流速逐渐增大,越靠近底部,湍动强度越大.计算了不同水流条件下底泥的冲刷率,得出冲刷率与冲刷切应力成正比,并通过实验数据计算得到冲刷系数.

英文摘要：

To study the mud transportation law in estuarine and coastal areas,a method of combining theoretical analysis with water tank tests was adopted with the mud sampled in the Tanggu area on the Tianjin Bohai Coast.The relationship between rheological parameters and density was discussed.The exponential distribution relationships between Bingham ultimate shear stress,coefficient of viscosity,and density were established.Additionally,an incipient motion law concerning cohesive sediment was derived by performing exercises under different bottom densities and flow conditions;the results show that the incipient motion of mud could also be described with Shield＇s curve.As the mud density increased,the incipient velocity corresponding with the cohesive sediment increased.On other hand,as water depth decreased,the incipient velocity of the cohesive sediment increased.Approaching the bottom,turbulent intensity would gradually increase;which is also a key factor affecting the incipient velocity of the cohesive sediment.Based on this,the rate of mud erosion in different flow conditions was calculated and shown to be directly proportional to shear stress,and the erosion coefficient was obtained from experimental data.