Skip common site navigation and headers
United States Environmental Protection Agency
Exposure Research
Begin Hierarchical Links EPA Home > Research & Development > Exposure Research > Publications/Presentations > End Hierarchical Links

 

Integrating Landscape Assessment and Hydrologic Modeling for Land Cover Change Analysis

spacer
spacer
Abstract:This study is based on the assumption that land cover change and rainfall spatial variability affect the r-ainfall-runoff relationships on the watershed. Hydrologic response is an integrated indicator of watershed condition, and changes in land cover may affect the overall health and function of a watershed. This paper argon watershed response were quantified using describes a study wherein the effects of land coyer c* hydrologic simulation models in two distinctly different watersheds, one a semi-arid watershed in southeast Arizona, and the other a forested watershed in upstate New York- One of the models is event-based with a c)ne-minute time step (KINEROS), and the second is a continuous model with a daily time step (SWAT). Inputs to the models were derived from a geographic information system (GIS) based tool utilizing USGS digital elevation models, the State Soil Geographic Database (STATSGO) and Landsat-based North American Landscape Characterization (NALC) imagery in conjunction with available literature and look up ables. Continuous rainfall data from available National Weather Service rain gauges were used as input to SWAT, while design storms were created from historical data to provide rainfall input to KINEROS. Landscape composition and pattern metrics have been generated from digital land cover maps derived from the images and compared across a nearly 25-year period. Results about changes in land cover for the study period indicate that in the San Pedro study area, grasslands and desertscrub not only decreased in extent but also became more fragmented due to the encroachment of xerophytic mesquite woodland. In the Cannonsville watershed change has been subtle with shifts in composition resulting in a net 'increase in forest cover. These change have important implications for hydrology since alterations in land cover types can impact energy and water balance characteristics. Hydrologic simulations were carried out for both study areas over the periods of record covered by the interpreted satellite data, and simulation results underscore the role of land cover in determining runoff volume and rate as well as water quality.
spacer
Citation:Miller, S. N., W. G. Kepner, M. H. Mehaffey, M. Hernandez, D. C. Goodrich, R. C. Miller, D. T. Heggem, P. Miller, and F. K. Devonald. Integrating Landscape Assessment and Hydrologic Modeling for Land Cover Change Analysis. JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION 38(4):915-929, (2002).
spacer
spacer
Contact: Chris Siebert - (702) 798-2234 or siebert.christopher@epa.gov
spacer
Division: Environmental Sciences Division
spacer
Branch: Landscape Ecology Branch
spacer
Product Type: Other Journl
spacer
Published: 10/15/2002
spacer
Related Entries:
spacer
Bullet Item Development of Landscape Indicators for Use in Regional Ecological Risk Assessments
spacer Relationship Reason:   A Project of the Product
spacer
spacer
spacer

 

ORD Home | Search EPA | Search NERL | Search EIMS | Contacts | Help

 
Begin Site Footer

EPA Home | Privacy and Security Notice | Contact Us

Last Updated on Monday, October 22, 2007
URL: http://cfpub.epa.gov