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Global Change Master Directory (GCMD)
The Hydrological Routing Algorithm (HYDRA)
Entry ID: NASA_CASA_HYDRA


Summary
Abstract: The Hydrological Routing Algorithm (HYDRA) is a computer model that simulates the regional scale flow of water (Coe et al., 2000). HYDRA simulates a set of physical hydrologic processes including interception, infiltration, interflow, base flow, overland routing and channel routing. The HYDRA model uses river transport directions based on digital elevation model (DEM) representations of the land surface. River discharge is calculated at each grid cell as the accumulated flow of water across the drainage basin surface. Lake and wetland area and volume are calculated as a function of the local precipitation minus evaporation, the stream flow into and out of the grid cells, and the potential for storage of water on the surface as derived from DEMs. HYDRA is being periodically modified to include effects of man-made structures (i.e., dams and reservoirs) and management practices (i.e., irrigation and reservoir operations), to account for the human controls over terrestrial hydrological systems.

HYDRA uses inputs of long-term monthly precipitation from interpolated weather station data sets, and surface evapotranspiration, snowmelt, and soil water retention from the coupled NASA-CASA (Carnegie-Ames-Stanford Approach) land surface model (see below). Satellite remote sensing products are used to define the land cover variations statewide. The inherent uncertainty in the climate model inputs (combined) likely introduce a baseline of 5-15% error into HYDRA's estimates of yearly and seasonal river discharge rates. Uncertainties in precipitation inputs alone could be even higher in remote locations where weather station coverage is sparse.

Related URL
Link: VIEW PROJECT HOME PAGE
Description: Hydrological Routing Algorithm (HYDRA) home page.

ISO Topic Category
BIOTA
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Platform
FIELD INVESTIGATION    [Information]


Keywords
Model
Water Flow
Hydrology
Water Transport
Dam
Reservoirs
Water Cycle


Personnel
TYLER B. STEVENS
Role: SERF AUTHOR
Phone: 301-851-8113
Email: Tyler.B.Stevens at nasa.gov
Contact Address:
5700 Rivertech Court
City: Riverdale
Province or State: MD
Postal Code: 20737
Country: USA


CHRISTOPHER S. POTTER
Role: TECHNICAL CONTACT
Phone: 650-604-6164
Fax: 650-604-4680
Email: Christopher.S.Potter at nasa.gov
Contact Address:
NASA Ames Research Center
Ecosystem Science and Technology Program
Mail Stop 242-4
City: Moffett Field
Province or State: CA
Postal Code: 94035
Country: USA


Extended Metadata Properties
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Creation and Review Dates
SERF Creation Date: 2006-11-08
SERF Last Revision Date: 2018-01-18



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