Boaz N T, Behrensmeyer A K
Am J Phys Anthropol. 1976 Jul;45(1):53-60. doi: 10.1002/ajpa.1330450107.
Flume experiments demonstrate that human skeletal parts sort into lag and transportable groups in a current flow of 31 cm/sec. Orientations, rates and types of movement, and stable positions are recorded. Density of a skeletal part is correlated with the average rate of movement, whereas wet weight in air, weight in water, and volume are not. Shape is an important but unquantifiable factor. Complete crania are the fastest moving elements; individual cranial fragments are in the lag group. Omo fluviatile deposits show a preponderance of hominid lag elements, whereas Olduvai and East Rudolf perilacustrine deposits present a mixture of transportable and lag elements.
水槽实验表明，在流速为31厘米/秒的水流中，人类骨骼部分会分成滞后组和可移动组。记录了其方向、移动速率和类型以及稳定位置。骨骼部分的密度与平均移动速率相关，而空气中的湿重、水中的重量和体积则与之无关。形状是一个重要但无法量化的因素。完整的颅骨是移动最快的元素；单个颅骨碎片则属于滞后组。奥莫河漫滩沉积物中人类滞后元素占优势，而奥杜瓦伊和东鲁道夫湖岸沉积物中则既有可移动元素也有滞后元素。
