基于Fluent强震区王家沟泥石流运动特征研究

为研究泥石流的运动特征,该文首次引入计算流体动力学软件Fluent,模拟研究泥石流在流通区和堆积区的运动状态及流体的液面范围。现场调查清水乡王家沟泥石流的基本特征,分析该泥石流的致灾因素。通过无人机拍摄获取流域DEM图,利用ArcGis、Mapgis、Auto CAD、Ansys等软件建立计算模型,将现场调查得到的泥石流降雨量、重度等相关参数导入Fluent软件中,进行泥石流的数值模拟。模拟结果显示,王家沟泥石流最大流速12.30 m/s,主要发生在流通区下游沟道拐弯处。泥石流沟道越窄,地形越陡,流速越大;泥石流流到堆积区时开始减速,并沿沟道左岸漫流堆积。该泥石流的威胁对象主要为流体左侧沟口居民区及S306省道枢纽。

Research on Movement Characteristics of Wangjiagou Debris Flow Based on Fluent Technology

In order to study the movement characteristics of debris flow,we introduce the computational fluid dynamics software Fluent for the first time to simulate and study the movement state of debris flow in the circulation area and accumulation area and the fluid level range.The basic characteristics of the debris flow of the Wangjia gully in Qingshui Township is investigated and the disaster-causing factors of the debris flow is analyzed.The DEM map of the watershed is acquired by drone shooting,and the calculation model established using software such as ArcGis,MapGis,Auto CAD,Ansys,etc.and the relevant parameters such as rainfall and severity of the debris flow obtained from the field investigation are imported into the Fluent software for numerical simulation of the debris flow.The simulation results show that the maximum flow velocity of Wangjiagou debris flow is 12.30 m/s,which mainly occurs at the turn of the channel downstream of the circulation area.The narrower the debris flow channel and the steeper the terrain,the greater the velocity;when the debris flow reaches the accumulation area,it starts to slow down and accumulate along the left bank of the channel.The threat objects of this debris flow are mainly the residential area at the left side of the fluid and the S306 provincial highway hub.