| Summary: | 碩士 === 國立中央大學 === 土木工程學系 === 84 === The spatial and the temporal distribution of the precipitation
in Taiwan is highly non-uniform.Therefore, it is important to
conserve water resources both in surface and subsurface by
keeping green cover ratio in a reasonable level. In this study,
we classify the land cover into two different categories
according according to the greenness.The TM satellite images
provided by Landsat are analyzed with imagine processing
technique, NDVI and Tasseled Cap transformation to perform the
spctral enhancement.The method of Tasseled Cap transformation
outperforms NDVI method.A map of the green cover ratio in Taiwan
arepresented. The results show the green cover ratio in Taiwan
approximates 81%. Furthermore, a watershed model, GWLF(
Generalized Watershed Loading Function),was applied to the Pu-Ze
watershed to study the effects of land cover on water
conservancy. This model is based on the water balance concept.
The model was calibratted for parameters and was validated to
insure its feasibility. Finally, the model is utilized to
predict groundwater recharge, evaporation, and streamflow,
givdifferent land use type. The performance of water
resourcesconservancy in this particular watershed was dissussed.
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