| Summary: | 碩士 === 國立中興大學 === 水土保持學類 === 84 === The main purpose of slopeland development has changed from
simple production to multiple conserving utilization in order to
develop a sustainable-slopeland agriculture. The objective of
this study is to monitor the soil erosion, runoff and sediment
yield after the development of an agricultural watershed in
Tainan county. The measured soil erosion, runoff and sediment
yield were also compared with output from the AGNPS model. The
results are summarized as follows : 1.The measured soil
erodibility factor (K) in the experimental area is 0.09. 2.From
April, 1995 to March, 1996, the soil erosion and sediment yield
measured at the experimental site are 544.5 t/ha and 188.8 t/ha,
respectively. 3.The cover and management factor (C) is dynamic
and time dependent. The function of C factor is :Y=0.9685*
EXP(-0.009152*X) where Y : C factor X : time(day) 4.The measured
runoff coefficients (Cr) are between 0.40 and 0.45. The sediment
delivery ratio is about 34.7%. 5.The values of soil erosion,
sediment yield, sediment delivery ratio and runoff coefficient
simulated by AGNPS are 449.7 t/ha, 155.7 t/ha, 34% and 0.28,
respectively. Comparison of measured and simulated results
indicated that AGNPS is suitable for estimating soil erosion and
sediment yield in agricultural watershed and also as a tool for
making the necessary management decisions.
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