黏性泥石流运动模型在蒋家沟的对比检验

介绍了Bagnold模型、Takahashi模型、费祥俊模型、Iverson模型4个代表性黏性泥石流运动的模型,并利用云南省东川市蒋家沟的23阵泥石流测量资料对其进行对比检验。结果表明,Bagnold模型模拟的流速值总体上与测量值接近,但是弥散应力无法支撑固相有效重力;Takahashi模型模拟的流速值总体偏小;费祥俊模型模拟的水力坡降和断面平均流速均偏小;对Iverson模型的初步分析表明,蒋家沟泥石流具备维持受力平衡所需液化度的条件。参数敏感性分析表明,极限浓度对Bagnold模型和Takahashi模型影响较大,内摩擦角对费祥俊模型和Iverson模型影响较大。

Contrast Tests for Models on Viscous Debris Flow Using Observations from Jiangjiagou Watershed

Four representative models on viscous debris flow are introduced,including Bagnold′s model,Takahashi′s model,Fei′s model and Iverson′s model.Contrast tests for the four models are made using the data observed from 23 debris-flow surges in Jiangjiagou,Dongchuan City,Yunnan Province.The mean value of velocities simulated by Bagnold′s model approximates to that of observations and however,simulated dispersion stress is not strong enough to sustain effective gravity of the solid phase.Simulated velocity by Takahashi′s model is less than observations.Hydraulic gradient can be simulated by Fei′s model,which is also less than observations.Primary analysis with Iverson′s model shows that the liquefaction degree computed by stress balance equation can be achieved in Jiangjiagou watershed.Analysis of the sensitivity of each model to some parameters indicates that Bagnold′s model and Takahashi′s model are sensitive to the maximum possible concentration,while Fei′s model and Iverson′s model are sensitive to the internal friction angle.