交错齿槛型泥石流排导槽研究初探

排导槽是一种常见的泥石流防治措施,提出了交错齿槛槽定义,即该类槽是指由两束流侧墙及置于其间交错排列的梯级齿槛群构成的一种新型泥石流排导槽,根据流域面积与沟床纵比降可分为3种类型;详细分析了交错槽的结构特征,并根据泥石流的不同阶段阐述了泥石流在交错槽中的流态形式;最后从消能机制、冲刷磨蚀、生态效益等方面将交错槽与东川槽等常规阶梯深潭系统做了比较,指出交错齿槛槽具有明显的优势,为进一步研究泥石流与交错齿槛的作用机制、泥石流在其中的排导特征等打下基础。

Preliminary study on debris-flow drainage channel with staggered indented-sill

Drainage channel,one of the most common debris-flow countermeasures,becomes more and more significant in debris-flow control.A new type of debris-flow channel,namely drainage cannel with indented sill(DCIS),which consists of two-side wall and some indented sill between them,is proposed herein.This type of drainage channel can be classified into three categories according to the flow area and the longitudinal gradient of the channel.This paper analyzed the structural characteristics of the DCIS and the movement mode of debris-flow in DCIS,compared the mechanism of energy dissipation,failure mode and ecological effect,etc.with those of the Dongchuan-type drainage channel.The analyses show that the DCIS has obvious advantages over the Dongchuan-type drainage channel.The research findings could give a reference to further exploration of DCIS.