Model:IDA

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IDA

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Summary Contact Technical specs In/Output Process Testing Other Component info Also known as Implicit Drainage Area Model type Tool Model part of larger framework Note on status model Date note status model Incorporated models or components: Spatial dimensions 2D Spatial extent Continental, Regional-Scale, Landscape-Scale, Watershed-Scale Model domain Hydrology One-line model description An implementation of the Implicit Drainage Area method (regular and hybrid versions) for calculating drainage area from flow directions using parallel iterative solvers. Extended model description IDA formulates the task of determing the drainage area, given flow directions, as a system of implicit equations. This allows the use of iterative solvers, which have the advantages of being parallelizable on distributed memory systems and widely available through libraries such as PETSc. Using the open source PETSc library (which must be downloaded and installed separately), IDA permits large landscapes to be divided among processors, reducing total runtime and memory requirements per processor. It is possible to reduce run time with the use of an initial guess of the drainage area. This can either be provided as a file, or use a serial algorithm on each processor to correctly determine the drainage area for the cells that do not receive flow from outside the processor's domain. The hybrid IDA method, which is enabled with the -onlycrossborder option, uses a serial algorithm to solve for local drainage on each processor, and then only uses the parallel iterative solver to incorporate flow between processor domains. This generally results in a significant reduction in total runtime. Currently only D8 flow directions are supported. Inputs and outputs are raw binary files. Keywords: drainage basin, watershed, hydrological, parallel computing, Name Alan Richardson Type of contact Model developer Institute / Organization Massachusetts Institute of Technology Postal address 1 77 Massachusetts Ave. #54-217 Postal address 2 Town / City Cambridge Postal code 02139 State Massachusetts Country United States Email address alan_r@mit.edu Phone Fax Supported platforms Linux Other platform Programming language C Other program language Code optimized Multiple Processors Multiple processors implemented Distributed memory Nr of distributed processors Nr of shared processors Start year development 2012 Does model development still take place? No If above answer is no, provide end year model development 2012 Code development status When did you indicate the 'code development status'? Model availability As code Source code availability (Or provide future intension) Through CSDMS repository Source web address Source csdms web address https://github.com/csdms-contrib/ida Program license type BSD or MIT X11 Program license type other Memory requirements Typical run time Describe input parameters Input flow directions: 8 bit unsigned integers The numbers corresponding to each of the 9 possible flow directions are shown below: 32 64 128 16 0 1 8 4 2 So a cell with the value '1' means that the flow in that cell goes to the East, while a value of '32' means that the cell's flow goes to the North West. The value '0' implies that the cell is a sink and flow does not leave it Row major order is used. Input format Binary Other input format Describe output parameters Output drainage area, true drainage area, and initial guess: 64 bit float ('double') Row major order is used. The drainage area of cells with no drainage to or from them, such as ocean cells, will be the area of the cell itself (1.0, if all cells are given unit area). Output format Binary Other output format Pre-processing software needed? No Describe pre-processing software Post-processing software needed? No Describe post-processing software Visualization software needed? No If above answer is yes Other visualization software Describe processes represented by the model Computation of drainage area, which, for a particular cell, is the sum of cells that drain through that cell. Describe key physical parameters and equations Flow direction: the direction to the immediately neighboring cell (N,NE,E,...) to which flow from a cell is directed. Drainage area: The size of the total number of cells that drain through a cell. Describe length scale and resolution constraints Increasing the number of processors should allow larger/higher resolution landscapes to be considered. Describe time scale and resolution constraints This code does not involve time. Describe any numerical limitations and issues If you will be processing very large landscapes then you may need to configure PETSc with the --with-64-bit-indices option. Describe available calibration data sets Upload calibration data sets if available: Describe available test data sets As an example of running IDA, and a test to ensure that it is running correctly, a small project is provided. Unpack it using tar -xjf example.tar.bz2 Files: dir.bin: flow directions for a 1000 x 1000 cell landscape true.bin: the correct answer, for comparison run.sh: a Bash script to run the example. The script must be modified to specify the path to the IDA executable. Running: Make the Bash script executable with the command chmod +x run.sh Run the Bash script with ./run.sh It will run IDA several times with different options, and may take some time Depending on your configuration of PETSc, some of the runs may fail Upload test data sets if available: Media:Example.tar.bz2 Describe ideal data for testing Do you have current or future plans for collaborating with other researchers? Is there a manual available? No Upload manual if available: Model website if any Model forum / discussion board Comments View the included README file for additional notes on compiling and running This part will be filled out by CSDMS staff OpenMI compliant No but possible BMI compliant No but possible WMT component No but possible PyMT component Is this a data component Can be coupled with:

Model info Authors Alan Richardson Source code View in CSDMS GitHub repository Model citations Nr. of publications: 1 Total citations: 14 h-index: 1 m-quotient: 0.08 QR-code Link to this page Other models by author IDA

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Nr. of publications:	1
Total citations:	14
h-index:	1
m-quotient:	0.08

Publication(s)	Year	Type	Cited
. . , , . [[| (View/edit entry)]]		IDA	Model overview	Template:SEM 2128532008