Large scale hydraulic model tests were carried out to investigate the erosive potentials, bed stability and the performance as scour protection of wide-graded quarry-stone material with fractions ranging from 0.063 – 200 mm. Within the two phase test program the material was exposed to several wave spectra during hydraulic model tests in the Large Wave Flume of the Forschungszentrum Küste and additionally to an incrementally increased current in a closed-circuit flume at the Franzius-Institute. As result of the wave load, a maximum scour depth of S/D = 0.161 was observed after 9000 waves with a simulated storm duration of 20 h in model scale. Furthermore, fractional critical shear stresses were determined based on velocity measurements, which indicate highly selective incipient motion of individual fractions under steady current conditions. The selective mobility of this wide-graded material could not be expressed by the Shields approach.
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机译：进行了大规模的水力模型测试，以研究侵蚀电位，床层稳定性以及分数范围为0.063 – 200 mm的宽等级采石料的冲刷保护性能。在两阶段测试程序中，在ForschungszentrumKüste的大波浪水槽中进行水力模型测试时，该材料暴露于数个波谱中，此外，在Franzius研究所的闭路水槽中，该材料还暴露于逐渐增加的电流中。作为波浪载荷的结果，在模型规模中模拟持续20小时的9000次波浪之后，观察到最大冲刷深度为S / D = 0.161。此外，基于速度测量确定了分数临界剪切应力，这表明在稳定电流条件下各个分数的选择性运动非常高。 Shields方法无法表达这种广泛分级的材料的选择性迁移性。
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