| Summary: | 碩士 === 國立中興大學 === 水土保持學系 === 93 === Soil Conservation Service Curve Number was established by U. S. Soil Conservation Service. The reference table of SCS CN was established according to the soil classification, land utilization and antecedent moisture condition(AMC). It is doubted that while those regions have different hydrologic and geographic conditions, this SCS CN table is whether suitable for other regions or not. Therefore, I tried to use SCS CN method and adopted total precipitation of the day runoff occurring and antecedent five days whose mass precipitation is antecedent precipitation index(API) before runoff occurring, plus actual runoff data to establish suitable CN values as modified CN for Taiwan by calibration and validation in this study. The modified CN and another original CN from SCS CN table were applied in Agriculture Non-Point Source Pollution Model(AGNPS) to calculate soil loss, peak runoff rates, sediment delivery ratio and sediment yield of Sanyi experiment area and then calculated values of sediment yield were compared with the actual sediment yield during development period. Modified CN values of Sanyi experiment area are lower than the original ones, and the calculated sediment yield values with modified CN also lower than the values with original CN, meanwhile the calculated values of sediment yield with modified CN are closer to the actual values during development period. CN is a sensitive factor of calculating sediment yield in AGNPS, so adopting the correct CN is very important for effective estimation.
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