Understanding how river bedload responds to climate and land use changes and water resource management initiatives is critical in developing sustainable approaches to river management. Passive monitoring techniques permit investigation of interannual dependencies in bedload transport in high resolution, including sediment supply factors. Here, seismic impact plate records are processed using a probabilistic model BedLoad from Impact Plates model to derive a 5‐year bedload data set at 5‐min intervals for the lower River Avon, Devon, UK. For water years that range from very dry to very wet, annual coarse bedload yields are estimated to vary through two orders of magnitude with wide prediction intervals. The most effective discharge occurs consistently at about one‐third of bankfull flow, morphologically at “subbarfull” stage, the result of hysteretic trends and falling limb transport in this non‐threshold channel. A two‐phase sediment rating curve is revealed with a variable supply related “bulge” during in‐bank flows, giving way to a near‐linear trend during overbank flows. The supply related component is predicted well using a sensitivity style metric that combines the cumulative duration of competent flows with the magnitude‐duration product of near‐threshold flows, defining a field‐scale exemplar of “stress history.” Further, the relative proportion of supply related coarse bedload yield relates strongly to the relative wetness of the previous year. High resolution, multiyear data reveal that controls on bedload dynamics are unique to a site's hydrogeoclimatic context and position in the river basin. Passive monitoring holds promise for generating “type sites” of bedload behavior critical for use in improving aquatic biodiversity and the sustainability of river management.

中文翻译：

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平稳性之外：流量历史和泥沙供应对粗基床运输的影响

了解河床负荷如何响应气候和土地利用变化以及水资源管理计划，对于开发可持续的河道管理方法至关重要。被动监测技术可以高分辨率地研究床载运输中的年际依赖性，包括沉积物供应因素。在这里，地震碰撞板记录是使用来自碰撞板模型的概率模型BedLoad处理的，以5分钟为间隔导出英国德文郡下游雅芳河的5年床载数据集。对于从非常干燥到非常潮湿的水年，估计每年的粗河床产量将在两个数量级之间变化，且预测间隔较宽。最有效的排放持续发生在约满流量的三分之一处，形态上在“低于满载”阶段，滞后趋势和该非阈值通道中肢体运输下降的结果。揭示了一条两阶段的泥沙定额曲线，在岸上流量过程中出现了与供给有关的可变“凸起”，而在岸上流量过程中逐渐接近了线性趋势。使用敏感性样式度量标准可以很好地预测与供应有关的组件，该度量标准将有效流量的累积持续时间与接近阈值流量的幅度持续时间相结合，从而定义了“应力历史”的现场样本。此外，与供应有关的粗基床产量的相对比例与上一年的相对湿度密切相关。高分辨率的多年数据揭示了对床荷动态的控制对于该站点的水文地理气候环境和流域位置是唯一的。