Department of Agricultural and Forest Engineering, University of Lleida, Av. Alcalde Rovira Roure, 191, 25198 Lleida, Catalonia, Spain; Fluvial Dynamics Research Group (RIUS), University of Lleida, 25003 Lleida, Catalonia, Spain.
Department of Geography, University of the Balearic Islands, 07122 Palma, Balears, Spain.
Sci Total Environ. 2020 Nov 25;745:140952. doi: 10.1016/j.scitotenv.2020.140952. Epub 2020 Jul 19.
Hydropeaking, through artificially generated flow peaks, affects hydro-sedimentary dynamics on rivers. The frequency and magnitude of such artificial flow pulses impact sedimentary process and, inevitably, affects bed-material entrainment. This study analyses the entrainment of particles in six sections of a Pyrenean river under frequent hydropeaking. Three equations of particle entrainment with contrasting behaviours, validated for particle mobility from tracer data, have been used to predict the initiation of motion in each section. Results show that the peak discharge generated by the hydropower station mostly affects the section immediately downstream from the hydropower plant, where the finer fractions of the bed are mobilised. The mobile grain sizes include fine to medium gravels (< 20mm). Channel geometry and higher slopes also have an effect on particle entrainment. Entrainment of the finer size fractions of the bed is termed partial transport, i.e. a partially size-selective transport that occurs downstream from the hydropower station and winnows the sand and small gravel further downstream.
调峰，即通过人为产生的流量高峰，会影响河流的水力泥沙动力学。这种人为的流量脉冲的频率和幅度会影响泥沙过程，不可避免地会影响底质的输运。本研究分析了频繁调峰下的比利牛斯山脉一条河流的六个河段中的颗粒输运。使用了三个具有不同行为的颗粒输运方程，这些方程是根据示踪剂数据验证的，用于预测每个河段中颗粒运动的起始。结果表明，水电站产生的峰值流量主要影响紧邻水电站下游的河段，该河段的床底较细颗粒被输运。可移动的颗粒尺寸包括细到中砾石（<20mm）。河道几何形状和较高的坡度也会影响颗粒的输运。床底较细颗粒的输运被称为部分输运，即发生在水电站下游的部分尺寸选择性输运，会进一步筛选出砂和小砾石。
