| Summary: | 碩士 === 國立臺灣大學 === 農業工程研究所 === 83 === Models play an important role in the estimation of nonpoint source（NPS）pollution severity and in the identification of NPS problem areas. Because contaminants are transported by runoff to surface waters, hydrologic processes are often at the core of water quality and quantity concerns. NPS models consist of hydrologic models and water quality models in hydrological process .In recent years , distributed models replace lumped model, because all the effect spatially variable
data may be calculated and analysed throught the watershed
or hydrologic unit , therefore ,accurate modeling results can
be obtained. However ,the large amount of data need to be
compiled and analysed for the distributed model resulting
in the model''s capability exceeding data availablity. The
intergration of the spatial data handling capabilities of a
GIS with a distributed NPS model offers the advantages
associated with utilizing the full information content of
the spatially distributed data to analyse the process . In
this reserch ,GIS technology provides powerful capabilities
for manipulating both input and output parameters required by
VAST model in the Bashi creek study area.
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