摘要
暴雨泥石流是在降水的作用下,坡面产生地表和地下径流,改变了土壤的稳定状态,形成局部地区的崩坍、滑坡、浅层崩塌等,汇流后以高含沙水流或泥石流等形态向下游输移形成的。降雨能级和泥石流可能发生的规模以H_(24)、H_(60)和H_(10)等参数确定,提出了发生泥石流的临界雨量值。沟坡在水动力作用下的失稳程度用河沟纵坡等15项因素评判。失稳程度划分为严重、中等、轻微和一般共4级。还对铁路桥涵设施的抗灾能力从最大通过能力、平面位置和有无防护设施等方面提出了判别标准。
The materials from coilapses and slopeslides at partial areas.produced by on-and underground runoff on slope in the effect of stom rainffall are transported downward in the form of high-concentration-sedi-merit flow or debris flow after convergency of flow. The class of rain-all energy and the probable range of debris flow are determined according to the parameters of H_(24), H_(60) andH_(10), raising the critical value of rainfall inducing debris flow. The unstableness of slope under the action of water kinetics is judged with fifteen factors such as slope, and classified into four grades, i.e., serious, moderate, slight and common. It also puts forward the criterion to evaluate the disaster resistent ability of bridges in the railroad from the view of maximum flow capability, plane location and the existence of protection installation.
出处
《水土保持学报》
CSCD
北大核心
1990年第4期14-20,共7页
Journal of Soil and Water Conservation
关键词
泥石流
暴雨
预报
debris flow by rainfall slope railway forecast
