Torres A, Bertrand-Krajewski J-L
INSA-Lyon, LGCIE, F-69621 Villeurbanne cedex, France.
Water Sci Technol. 2008;57(9):1389-96. doi: 10.2166/wst.2008.307.
Field experiments were carried out to contribute to the assessment of the VICAS protocol aiming to measure settling velocities of particles. Samples of deposited sediments have been taken in the Django Reinhardt stormwater detention and settling tank in Chassieu, France, using sediment traps located on the tank bottom. The first set of experiments was designed to assess the VICAS protocol in terms of mass balance and repeatability. A bias in the measurement of settling velocities distributions of deposited sediments (i.e. particles with high settling velocities) was suspected and confirmed by specific tests. Uncertainties in the final distribution curves have been evaluated by using Monte Carlo simulations and the law of propagation of uncertainties. All uncertainty calculations were implemented in a MatLab code named UVICAS used for each experiment. This code allows analysing the main sources of uncertainties and their evolution during experiments. Uncertainties in the final distribution curves decrease with increasing values of settling velocities and are lower than 1%.
开展了实地试验，以帮助评估旨在测量颗粒沉降速度的VICAS协议。在法国沙西厄的jango Reinhardt雨水滞留沉淀池，利用位于池底的沉积物捕集器采集了沉积沉积物样本。第一组实验旨在从质量平衡和可重复性方面评估VICAS协议。沉积沉积物（即沉降速度高的颗粒）沉降速度分布测量中的偏差被怀疑，并通过特定测试得到证实。通过蒙特卡罗模拟和不确定性传播定律评估了最终分布曲线中的不确定性。所有不确定性计算都在一个名为UVICAS的MatLab代码中实现，该代码用于每个实验。此代码允许分析不确定性的主要来源及其在实验过程中的演变。最终分布曲线中的不确定性随着沉降速度值的增加而降低，且低于1%。
