BASEMENT System Manuals VAW - ETH Zurich v2.8.1 BASEMENT System Manuals VAW - ETH Zurich v2.8.1 Contents Preamble 5 Credits . 5 License ......................................... 7 1 Pre-Processing in QGIS with BASEmesh 11 1.1 Introduction . 11 1.2 Tutorial 1: Mesh Generation based on Pointwise Elevation Data . 12 1.2.1 Project Settings . 13 1.2.2 Coordinate Reference System Configuration . 14 1.2.3 Loading Input Data for Elevation Model . 14 1.2.4 Saving Layer as Shape File . 15 1.2.5 Loading the Model Boundary . 15 1.2.6 Editing the Model Boundary . 17 1.2.7 Loading Breakline Data . 19 1.2.8 Creation of the Elevation Model as TIN . 20 1.2.9 Adaption of the Breaklines for Quality Meshing . 21 1.2.10 Creation of Region Marker Points . 22 1.2.11 Creation of Quality Mesh . 24 1.2.12 Interpolating elevation data from elevation mesh (TIN) . 25 1.2.13 3D view of the mesh . 26 1.2.14 Export of mesh to 2dm . 27 1.3 Tutorial 2: Import/Modify an existing Mesh and use Raster Data as Elevation Model . 28 1.3.1 Importing a .2dm mesh file . 29 1.3.2 Modifying the material indices of elements . 29 1.3.3 Manual editing of mesh elements . 33 1.3.4 Renumbering the mesh . 34 1.3.5 Interpolating elevations from raster data . 35 1.4 Tutorial 3: Using dividing constraints along boundary cross sections and setting up a BASEMENT simulation with a mesh from BASEmesh . 35 1.4.1 Using dividing constraints for Quality meshing . 37 1.4.2 Extraction of Stringdef information from the mesh . 38 1.4.3 Set-up BASEMENT command file: Add mesh . 40 1.4.4 Set-up BASEMENT command file: Add stringdefs . 41 1.4.5 Set-up BASEMENT command file: Add friction values . 41 1.4.6 Data Visualization . 42 1.5 Tutorial 4: Create 1D BASEchain mesh from a DTM using HEC-RAS/ HEC-GeoRAS . 43 1 Contents BASEMENT System Manuals 1.5.1 Set-up the environment . 45 1.5.2 Generate the cross section profiles . 46 1.5.3 Set the cross section, main channel and friction properties . 47 1.5.4 Export the data from HEC-GeoRAS . 48 1.5.5 Import GIS data into HEC-RAS and export a geometry file . 48 1.5.6 Convert HEC-RAS format to BASEchain format using BASEmesh . 49 1.6 Tips and Tricks . 51 1.6.1 Recommended Plugins . 51 1.6.2 Tipps and Tricks . 51 2 Post-Processing of 2D simulation results 55 2.1 Introduction . 55 2.2 2D result visualization with QGIS Crayfish . 55 2.2.1 Input data . 55 2.2.2 About Crayfish . 56 2.2.3 Installation . 56 2.2.4 Load and visualize data . 58 2.2.5 Creating maps and animations . 65 2.3 3D result visualization with Paraview . 72 2.3.1 Input data . 72 2.3.2 About Paraview . 73 2.3.3 Installation . 73 2.3.4 User Interface . 74 2.3.5 Import Data . 75 2.3.6 ParaView Filters . 76 2.3.7 Exporting figures and animations . 80 3 Hydrodynamics and sediment transport at the river Thur (1D) 85 3.1 Introduction . 85 3.1.1 General description . 85 3.1.2 Used features . 86 3.1.3 Purpose . 86 3.2 Setting up the topography file . 86 3.2.1 Cross sections . 86 3.2.2 Definition of different cross section zones . 87 3.2.3 Friction values . 88 3.2.4 Computation of water surface elevation . 90 3.2.5 Characterisation of the sediments . 90 3.2.6 Define flowing zones . 91 3.3 Setting up the command file . 91 3.3.1 Project . 91 3.3.2 Domain . 92 3.3.3 Define the physical properties . 92 3.3.4 One dimensional simulation . 92 3.4 Perform hydraulic simulations . 95 3.4.1 Perform steady flow simulation (Thur1) . 95 3.4.2 Perform simulation of the floods (Thur2) . 96 3.5 Complete the command file for bed load transport . 100 2 VAW - ETH Zurich v2.8.1 BASEMENT System Manuals Contents 3.5.1 Define the bed material . 100 3.5.2 Soil assignment . 101 3.5.3 Define general parameters for sediment transport . 101 3.5.4 Define specific parameters for bed load transport . 102 3.5.5 Define bed load transport formula . 102 3.5.6 Define boundary conditions for bed load . 102 3.5.7 Generate a “geometry” file . 103 3.6 Perform bed load simulation (Thur 3) . 103 4 Dynamics of longitudinal bed profile due to local river widening (1D) 105 4.1 Introduction . 105 4.1.1 General description . 105 4.1.2 Purpose . 106 4.1.3 Used features . 107 4.1.4 Parameter variation . 108 4.2 Model setup . 108 4.2.1 Definition of 1D topography . 108 4.2.2 Determination of the upstream sediment boundary conditions . 109 4.3 Results of numerical simulations . 110 4.3.1 Temporal evolution of longitudinal bed profile . 110 4.3.2 Width and length of the widening . 110 4.3.3 Discharge and grain diameter . 110 5 Hydrodynamics and sediment transport at the river Flaz (2D) 117 5.1 Introduction . 117 5.1.1 Case study description . 117 5.1.2 Tutorial structure . 118 5.2 Computational grid . 118 5.3 Setting up the command file . 120 5.3.1 Project . 120 5.3.2 Domain . 120 5.3.3 Parallel . 121 5.3.4 Physical properties . 121 5.3.5 Two dimensional simulation . 121 5.4 Perform hydraulic simulation . 126 5.4.1 Perform steady flow simulation . 126 5.4.2 Perform unsteady flow simulation . 127 5.4.3 Calibration of the hydraulic model . 131 5.5 Morphological simulation with single-grain bed load transport . 132 5.5.1 Define the morphological information . 133 5.5.2 Define the output . 138 5.6 Perform morphological simulation with single-grain bed load transport . 139 5.7 Morphological simulation with multi-grain bed load transport . 142 5.7.1 Morphological parameters . 142 5.7.2 Grain size distribution . 142 5.7.3 Grain mixture . 142 5.7.4 Define the soil composition . 143 5.7.5 Bed load boundary condition . 144 v2.8.1 VAW - ETH Zurich 3 Contents BASEMENT System Manuals 5.7.6 Bed load formula . ..