Tool NameFlow Accumulation (Flow Tracing)
Tool ID2
Library IDta_hydrology
Version1.0
Author(s)O.Conrad (c) 2001

Description

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.

References

Costa-Cabral, M. & Burges, S.J. (1994): Digital Elevation Model Networks (DEMON): a model of flow over hillslopes for computation of contributing and dispersal areas. Water Resources Research, 30:1681-1692. doi:10.1029/93WR03512

Fairfield, J. & Leymarie, P. (1991): Drainage networks from grid digital elevation models. Water Resources Research, 27:709-717. doi:10.1029/90WR02658

Lea, N.L. (1992): An aspect driven kinematic routing algorithm. In: Parsons, A.J. & Abrahams, A.D. [Eds.], 'Overland Flow: hydraulics and erosion mechanics', London, 147-175. doi:10.1201/b12648

Parameters

NameTypeIdentifierDescriptionConstraints
Input
Elevationgrid, inputELEVATION
Sink Routesgrid, input, optionalSINKROUTE
Weightsgrid, input, optionalWEIGHTS
Sinksgrid, input, optionalSINKSA grid indicating sink (terminal) cells. Cells with valid values (i.e. not NoData) act as sinks that capture all incoming flow and sediment and do not route anything downslope.
Input for Mean over Catchmentgrid, input, optionalVAL_INPUT
Material for Accumulationgrid, input, optionalACCU_MATERIAL
Accumulation Targetgrid, inputACCU_TARGET
Output
Flow Accumulationgrid, outputFLOW
Mean over Catchmentgrid, outputVAL_MEAN
Accumulated Materialgrid, output, optionalACCU_TOTAL
Accumulated Material (Left Side)grid, output, optionalACCU_LEFT
Accumulated Material (Right Side)grid, output, optionalACCU_RIGHT
Options
Stepinteger numberSTEPFor testing purposes. Only generate flow at cells with step distance (each step row/column).Minimum: 1
Default: 1
Flow Accumulation UnitchoiceFLOW_UNITAvailable Choices:
[0] number of cells
[1] cell area
Default: 1
MethodchoiceMETHODAvailable Choices:
[0] Rho 8
[1] Kinematic Routing Algorithm
[2] DEMON
Default: 1
Flow CorrectionbooleanCORRECTDefault: 1
Minimum DQVfloating point numberMINDQVDEMON - Minimum Drainage Quota Volume (DQV) for traced flow tubesMinimum: 0.000000
Maximum: 1.000000
Default: 0.000000