RAMMS
Rapid Mass Movement Simulation
RAMMS软件是由瑞士原版引进，操作界面和程序语言为英语，为了准确表达原版问答内容，FAQ栏目内容采用英语，供您参考！
Problem after updating to 1.8.0Problem:I updated RAMMS::Avalanche (or Debrisflow) to version 1.8.0, but now I cannot run any simulations. RAMMS is stuck with "Create .xy-file", see Figure 1 below.... Unable to invoke method on NULL object reference: .....What is going on here?This warning (see first image below) is mostly connected to a corrupt "preference file". The "IDL System Error" is mostl... Answer:Yes, you can, but this is work in progress. Please get in contact with us and we gladly help! AnswerYes, you can make gif animations repeat. Please do the following:Open ‘Additional Preferences’ (button in left vertical toolbar or menu ‘Help -> Advanced… -> Additional Preferences… -> Edit’)... In the following we will describe how to convert a .dwg file (e.g. from AutoCAD) to an ASCII DTM file with ArcGIS. For the steps listed below you need ArcGIS with the Spatial Analyst extension enab... IDL System ErrorFebruary, 2nd 2021Problem:When trying to start RAMMS, the following error message appears:A system error was detected during tool creation: RESTORE: End of file encountered. Unit: 1... How long does it take to perform a simulation?Answer The time required to simulate an avalanche or a debris flow is a function of the finite volume grid resolution and the size of the calculation d... Does RAMMS take terrain curvature into account?Answer:Since Version 1.6.20, the normal force N now includes centrifugal forces arising from the terrain curvature. We use the method proposed by Fisc... How is cohesion used in RAMMS::Avalanche?Answer:Since Version 1.6.20 the basic Voellmy equation has been modified to include cohesion, see equation below, where C is the cohesion of the flowing mat... What numerical solution technique does RAMMS use?Answer:In all RAMMS versions (Avalanche and Debrisflow) up to Version 1.5.01, an ENO (Essentially Non-Oscillatory) scheme was used to numerically so... When and why does the Voellmy model work well for Avalanches?Answer:AvalanchesThe Voellmy model – coupled with the calibrated parameters – can be used to(1) predict the runout distance and(2) pred... What friction models are used in RAMMS?Answer:RAMMS (Avalanche and Debrisflow modules) employs a Voellmy-fluid friction model. This model divides the frictional resistance into two parts:a dry-Coul... How do I speed up my debris flow simulation?Problem: My debris flow simulation takes ages to calculate. I use a 0.5m resolution. Do you have any suggestions on how to speed up my simulation? And s... Why use a hydrograph for debris flow modelling?Answer:There a several good reasons.Firstly, hazard mitigation experts are often interested in the flow behaviour only near the fan. Calculating the m... Answer:Debris flowThe “best” constitutive model for debris flows is still a very open question in the scientific community. We recommend using the Voellmy model until a better model is found. Voell... How is yield stress (cohesion) used in RAMMS::Debrisflow?Answer:Since Version 1.6.20 the basic Voellmy equation has been modified to include yield stress (cohesion), see equation below, where C is ... RAMMS ERROR: Planes must be parallelOctober 25th 2021Problem:I get an error when I import the shapefile of my release areas. What is going wrong?Answer:The polygon shapefile most probably contains ... Forest Cover HeightOctober 14th 2021Question:We have a query about the Zh-height value assumed in the calculations. The manual notes that Zh varies between 5m and 30m, with a default value of 30m, ... Overhanging faceOctober 14th 2021Question:I want to model rockfalls from a rockface above a road. But the rockface has an area which is overhanging. Does your software allow for overhanging rockfa... |