1. Plan Elements
A. Model Simulations:
Participants will generate
hydrographs in two ways:
1) Simulations using uncalibrated
versions of their model.
2) Simulations using models
calibrated at basin outlet.
NEXRAD data will be the
precipitation forcing for all simulations.
Participants will test their models on basins (200-2500 km2) to produce
basin outlet hydrographs.
Where observed data are available, models will also produce a 'blind' simulation
at interior sub-basin points as a test of providing answers at ungaged
Participants will not perform explicit calibration above these points.
See Test Basins for a listing and maps of the proposed interior
Models will produce simulations at HL-specified interior ungaged points
to assess variability of predictions amongst models.
B. Models will be run in continuous
retrospective simulation mode. Calibration and verification periods will be
specified (See Modeling Instructions).
C. Basins will be limited to those
used by HL's distributed modeling research.
D. Basic data sets will be provided by HL on its
web or ftp site.
E. Participants will model one or more basins to
produce a deterministic simulation.
F. Participants will submit their simulations to
HL in a (to-be-announced) standard format. HL will produce a comprehensive
analysis of all simulations compared to observed data and lumped SAC-SMA
simulations. This analysis will be presented at the HL-hosted workshop.
G. Simulations from participants' models will be
compared to those generated from a calibrated lumped SAC-SMA model.
H. It is envisioned that a paper describing the results
of the workshop will be submitted to a peer-review journal. Participants
will be coauthors. It is hoped that a special issue of a journal would
be dedicated to the results of DMIP.
I. Evaluation Criteria: standard statistical measures
for hydrograph comparison will be used.
2. Data Types Provided by HL
A. DEM: resolution is 400 m in Albers Equal Area
Projection. Higher resolution data such as the 30 m data from USGS could
also be made available. Participants are free to use other DEM data.
B Basin boundary LAT/LON pairs.
C. LAT/LON location of interior computational points.
D. Hourly streamflow data from USGS.
E. NEXRAD Stage III xmrg files and utility programs.
F. NRCS soils data (derived by D. Miller from STATSGO).
G. Energy forcing fields (possibly from NCEP regional
I. NDVI-5 Greenness Fraction Data.
J. Others, as donated by participants.
Participants needing other data will be responsible
for obtaining them.
3. Workshop at the Office of Hydrologic Development (OHD) (formerly
the Office of Hydrology (OH)): HL will 'host' a workshop after a specified
period of time where participants will present their results and discuss
A. Model overview
B. Model parameterization
C. Model calibration
D. Computational time
E. Comparison Statistics:
1) at parent basin outlet
2) at interior points where
observed streamflow data are available
3) HL-designated points for
inter-model variability assessment
statistics will be generated using observed flow records and the
calibrated lumped application of the SAC-SMA model.
F. Future modeling studies; publication of results;
special issue of a journal.
4. Funding: HL will "host" this intercomparison, not "support"
it, i.e., HL will supply the organizational legwork but participants should
look for some funds from their own or other organizations.