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Bed mobility on the Deschutes River, Oregon: Tracer gravel results

机译:俄勒冈州德舒特河上的河床流动性:示踪砾石结果

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Tracers are marked particles introduced into streams to obtain information on the movement of sediment in rivers. On the lower Deschutes River, Oregon, the threshold for bed mobility has been of interest in the relicensing of hydroelectric dams, with cross sections plotted from historical US Geological survey gauging records having shown changes at flows as low as 150 to 200 m(3) s(-1) and general mobility at approximately 250 m(3) s(-1). To obtain direct, empirical evidence of bed mobility, we deployed exotic gravel tracers (quartz particles) on the reach below the dam over four runoff seasons in which peak flows ranged from 146 to 192 m(3) s(-1), close to entrainment threshold indicated by the cross section changes. The observed tracer movements indicated the bed experienced partial mobility (with 0-37 % of particles moving). We found no unique relation between grain diameter and critical flow strength (e.g. specific stream power), suggesting that overall bed texture and structure were more important controls on mobility than individual grain sizes.
机译:示踪剂是引入河中的标记颗粒,以获得有关河流中沉积物运动的信息。在俄勒冈州的Deschutes河下游,水电大坝的重新许可引起了河床流动性的阈值,美国历史地质调查的历史记录所绘出的横截面表明流量低至150至200 m(3) s(-1)和大约250 m(3)s(-1)的一般迁移率。为了获得直接的床层流动性的经验证据,我们在四个径流季节的大径流季节中,在大坝下方的河段部署了奇异的砾石示踪剂(石英颗粒),其中峰值流量范围为146至192 m(3)s(-1),接近横截面指示的夹带阈值改变。观察到的示踪剂移动表明该床经历了部分移动性(0-37%的颗粒移动)。我们发现晶粒直径和临界流动强度(例如比流功率)之间没有独特的关系,这表明整体床的质地和结构比单个晶粒的尺寸对流动性的控制更为重要。

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