Flow

In 3Di, four different flow domains are defined: 2D Surface flow, 2D Interflow, 2D Groundwater flow and 1D Flow. The flow in these domains is computed based on conservation of mass and momentum. There are differences in the computation of the flow per domain. These are explained in the sections below.

Flow in 3Di

• Conservation laws
  • Conservation of mass
  • Conservation of momentum
• 2D Surface flow
  • Cross-sections and exchange levels
  • Obstacles
  • Friction in the 2D domain
  • Water level gradients
  • Sloping terrain
  • Vegetation in the 2D domain
• 2D Interflow
  • Basic principles of interflow
  • Computation of volume in 2D domain
  • Computation of flow in the interflow layer
  • Interflow in combination with the subgrid approach
  • Technical explanation of the four interflow types
  • Settings for interflow
  • Good to know
• 2D Groundwater flow
  • Introduction
  • Summary of groundwater concepts in 3Di
  • Groundwater concepts
  • Horton based infiltration
  • Groundwater flow
  • Numerical implementation
• 1D Flow
  • 1D Network
  • Cross-section shapes
  • 1D momentum equation
  • Advection in 1D domain
  • Friction in the 1D domain
  • Vegetation in the 1D domain
  • Pressurized flow
  • Channels, culverts and pipes
  • Weirs and Orifices
  • Pumps
• 1D2D Exchange
  • Exchange types
  • 1D2D Flow
  • Exchange between 1D and groundwater
  • Breach flow