Flow tracing algorithms for calculations of flow accumulation and related parameters. These algorithms trace the flow of each cell in a DEM separately until it finally leaves the DEM or ends in a sink.
The Rho 8 implementation (Fairfield & Leymarie 1991) adopts the original algorithm only for the flow routing and will give quite different results.
| Name | Type | Identifier | Description | Constraints |
Input | Elevation | Grid (input) | ELEVATION | - | - |
Sink Routes (*) | Grid (optional input) | SINKROUTE | - | - |
Weights (*) | Grid (optional input) | WEIGHTS | - | - |
Input for Mean over Catchment (*) | Grid (optional input) | VAL_INPUT | - | - |
Material for Accumulation (*) | Grid (optional input) | ACCU_MATERIAL | - | - |
Accumulation Target | Grid (input) | ACCU_TARGET | - | - |
Output | Flow Accumulation | Grid (output) | FLOW | - | - |
Mean over Catchment | Grid (output) | VAL_MEAN | - | - |
Accumulated Material (*) | Grid (optional output) | ACCU_TOTAL | - | - |
Accumulated Material (Left Side) (*) | Grid (optional output) | ACCU_LEFT | - | - |
Accumulated Material (Right Side) (*) | Grid (optional output) | ACCU_RIGHT | - | - |
Options | Grid system | Grid system | PARAMETERS_GRID_SYSTEM | - | - |
Step | Integer | STEP | For testing purposes. Only generate flow at cells with step distance (each step row/column). | Minimum: 1 Default: 1 |
Flow Accumulation Unit | Choice | FLOW_UNIT | - | Available Choices: [0] number of cells [1] cell area Default: 1 |
m_Method | Choice | METHOD | - | Available Choices: [0] Rho 8 [1] Kinematic Routing Algorithm [2] DEMON Default: 1 |
Flow Correction | Boolean | CORRECT | - | Default: 1 |
DEMON - Min. DQV | Floating point | MINDQV | DEMON - Minimum Drainage Quota Volume (DQV) for traced flow tubes | Minimum: 0.000000 Maximum: 1.000000 Default: 0.000000 |
(*) optional |