Hydrologic models for land-atmosphere retrospective studies of the use of LANDSAT and AVHRR data

Duchon, Claude E.; Williams, T. H. Lee; Nicks, Arlin D.

The use of a Geographic Information System (GIS) and LANDSAT analysis in conjunction with the Simulator for Water Resources on a Rural Basin (SWRRB) hydrologic model to examine the water balance on the Little Washita River basin is discussed. LANDSAT analysis was used to divide the basin into eight non-contiguous land covers or subareas: rangeland, grazed range, winter wheat, alfalfa/pasture, bare soil, water, woodland, and impervious land (roads, quarry). The use of a geographic information system allowed for the calculation of SWRRB model parameters in each subarea. Four data sets were constructed in order to compare SWRRB estimates of hydrologic processes using two methods of maximum LAI and two methods of watershed subdivision. Maximum LAI was determined from a continental scale map, which provided a value of 4.5 for the entire basin, and from its association with the type of land-cover (eight values). The two methods of watershed subdivision were determined according to drainage subbasin (four) and the eight land-covers. These data sets were used with the SWRRB model to obtain daily hydrologic estimates for 1985. The results of the one year analysis lead to the conclusion that the greater homogeneity of a land-cover subdivision provides better water yield estimates than those based on a drainage properties subdivision.

Document ID

19880017328

Acquisition Source

Legacy CDMS

Document Type

Contractor Report (CR)

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Date Acquired

September 5, 2013

Publication Date

June 2, 1988

Subject Category

Report/Patent Number

Accession Number

88N26712

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Public

Work of the US Gov. Public Use Permitted.

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