【摘要】 阶梯-深潭是山区河流中常见的一种具有高效消能作用的河床结构。2009年采用人工阶梯-深潭系统对文家沟滑坡体上的新生泥石流沟治理进行野外治理实验。在主沟上游段人工构筑33级阶梯-深潭,经历当年几次暴雨,由于通过在深潭内耗散水流的大部分能量,阻止了沟谷下切并有效地控制了泥石流的发生。对野外实验和数值模拟的结果分析表明,在一定的流量下,阶梯-深潭发育的河流系统有助于单位时间内单位重量水流能量耗散率将趋于最小,可以提升河流系统的稳定性。在地震区的泥石流沟内构筑阶梯-深潭系统有利于加速其稳定的进程,并减少灾害的发生。更多还原

【Abstract】 A step-pool system is a geomorphologic phenomenon occurring in high-gradient mountain streams. Field experiments were conducted with an artificial step-pool system on the Wenjiagou Gully to mitigate large volume debris flows in 2009. 33 artificial step-pools were constructed in upstream of the new Wenjiagou channel. During the flood season of 2009,the step-pool system dissipated most of flow energy in steps and hydraulic jumps and protected the bed sediment and banks from erosion,so the rainstorm floods did not trigger debris flows. Analysis proved that energy-dissipation rate of water-flow may tend towards to minimum in the river system with step-pool,thus the river system is more stable. It is beneficial for stability of the gullies and mitigating debris flows when step-pools were constructed in the channels.更多还原