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首页> 外文会议>Second International Conference on Estuaries and Coasts vol.1; 第二届河口海岸国际研讨会论文集 >RESEARCH ON THE SCOUR CHARACTERISTICS OF FINE SEDIMENT IN ESTUARY
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RESEARCH ON THE SCOUR CHARACTERISTICS OF FINE SEDIMENT IN ESTUARY

机译：河口细沙的冲刷特征研究

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The scour characteristics of fine sediment in an estuary are related to sediment properties and consolidation time. It is difficult to predict the scour of fine sediment. In this study flume, experiments have been done in order to simulate the scour process of fine sediment after experienced different consolidation time, the mean particle size was 0.07mm and the range of varied consolidation time was one year. Experimental results show that: the riverbed resistance to scour was related to consolidation time, on the condition of the homological hydrodynamic force, the riverbed resistance to scour increased with consolidation time and the scour rates decreased during the course of consolidation; and meantime, the scour rate was also related to the dry unit weight during the consolidation process. When the dry unit weight of fine sediment increased and reached a stable value after long time, the scour rate decreased and also approached the stable state, which presented different scour characteristics that depended on consolidation time. On the other hand, based on the analysis of the experiment results and considering the basic theory of sediment movement, introducing the scour coefficient to express the law of riverbed resistance to scour following consolidation time, the simplified scour rate formula was established. In this scour rate formula the factor of hydrodynamic force and the factor of sediment resistance to scour were also included. By comparison with the field data, the calculation result was closely fitted with the measured data in the same flow situation and good agreements were achieved. It shown since the effects of different consolidation time were considered during the process of scour, the variations of scour characteristics with consolidation time were well reflected in the scour rate formula of fine sediment.
机译：河口细沙的冲刷特征与泥沙性质和固结时间有关。很难预测细沙的冲刷。在该研究水槽中，进行了实验以模拟经历不同固结时间后细颗粒泥沙的冲刷过程，平均粒径为0.07mm，变化固结时间的范围为一年。实验结果表明：河床冲刷阻力与固结时间有关，在均质水动力作用下，河床冲刷阻力随着固结时间的增加而增大，在固结过程中冲刷速率降低。同时，冲刷率也与固结过程中的单位干重有关。当细泥沙的干重随着时间的增长而增加并达到一个稳定值时，冲刷率下降并且也趋于稳定状态，这表现出取决于固结时间的不同冲刷特性。另一方面，在对实验结果进行分析的基础上，结合泥沙运动的基本理论，引入冲刷系数表示固结时间后河床抗冲刷规律，建立了简化的冲刷率公式。在该冲刷率公式中，还包括流体动力的因素和泥沙抵抗冲刷的因素。通过与现场数据的比较，计算结果与相同流量情况下的实测数据吻合得很好。结果表明，由于在冲刷过程中考虑了不同固结时间的影响，因此细颗粒冲刷速率公式很好地反映了冲刷特性随固结时间的变化。

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