| Summary: | 碩士 === 國立中興大學 === 土木工程學系 === 85 === Astract
The rainfall and runoff factor(R-factor) of the Universal Soil
Loss Equation (USLE) varies with areas. The main purposes of
this study were to modify the R-factor and the equation of
kinetic energy. The R values were calculated based on the
raindrop data measured with the stain method for the areas of
Yang-Ming Mountain in Taipei, Taipei City, Taichung City
and Lien-Hua Chi in Nan-Tou. The results showed that the
rainfall kinetic energy curve of Yang-Ming Mountain in
Taipei, Taichung City and Lien-Hua Chi in Nan-Tou were
fairly close to that of Washington D.C.,USA ,while the
rainfall kinetic energy curve of Taipei City was lower than
that of other three experimental areas.
The foreign raindrop size data measured with photographic method
by Mueller are also analyzed in this study. The results
indicated that based on Muller''s data the rainfall
kinetic energy curve for most areas were lower than that of
Washington D.C.,USA. The mean annual R values were
estimated using the rainfall kinetic energy formula of Yang-Ming
Mountain in Taipei,Taipei Ciy,Taichung City and Lien-Hua Chi in
Nan-Tou, and the rainfall records of the four areas. The
mean annual R values were 1210 ,530 ,563 and 596(100.ft-
tons.in.ac.hr.yr) for Yang-Ming Mountain in Taipei,
Taipei City,Taichung City and Lien-Hua Chi,respectively.
To probe into the difference in raindrop size distribution
between domestic and foreign data, the goodness of fit of
data to different probability distributions were
studied. Based on the Kolmogorov-Smirnov test,it was found
that the beta distribution gave the highest passage ratio
for the domesitc data. The foreign data were analyzed with a
Kolmogorov-Smirnov test.The results showed that among the four
probability distributions considered the beta distribution and
the log-normal distributions gave description on the
raindrop size distribution.
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