Analysis Of Adjustment Of Satellite Precipitation
For Streamflow Simulations
Author(s)
K. Tobin & M. Bennett
Abstract
The lack of dense ground networks of meteorological stations in many parts of
the developing world impedes accurate hydrological modelling. These are
regions that could greatly benefit from satellite precipitation data. However,
there are significant problems with satellite products in providing reasonable
estimates of precipitation over land. Methods exist that can adjust satellite
products (with ground gauge or radar data) providing more robust estimates of
precipitation. However, high quality ground data may not exist within the pixel,
typically 0.25o x 0.25o, to provide the necessary information to facilitate the
adjustment of the satellite product. To address this problem this study will
examine how streamflow performance, based on satellite products (TRMM 3B42
Real-time – TMPA-RT; CMORPH) adjusted with ground precipitation data, will
vary over a range of spatial transfer distances (0o to 3.00o). The spatial transfer
distance is the mean distance that a rain gauge is located away from the centroid
of the watershed. This study compares simulated (driven by adjusted satellite
precipitation) and observed streamflow from six moderately large basins from
the United States. These basins span a range of climatic conditions from dry (San
Pedro Basin – Arizona; Cimmaron Basin – Oklahoma; Nueces Basin – South
Texas; middle Rio Grande Basin – Texas and northern Mexico) to humid
(Alapaha Basin – Georgia; Upper Tar Basin – North Carolina). This study is
unique because it quantities how far spatially transferred precipitation data can
be potentially applied to support hydrologic modelling, which is knowledge that
can be applied to poorly gauged regions of the world.
Keywords: TRMM, CMORPH, satellite precipitation, spatial transfer, SWAT.
Keywords
TRMM, CMORPH, satellite precipitation, spatial transfer, SWAT
Related Book
Other papers in this volume
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