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標題: A Study on Estimation of Runoff Coefficient with SCS CN Approach for Feitsui Reservoir Watershed
作者: Lai, Yu-sen
關鍵字: Runoff Coefficient;逕流係數;SCS CN Approach;Geographic Information System(GIS);Remote Sensing Hydrology;SCS曲線值法;地理資訊系統;GIS;遙測水文學
出版社: 水土保持學系
The slope of hill in Taiwan has being been cultivated and used illegally and so that the disasters have been occurred so frequently result from pouring rain for the bellowing reasons: special geographical location, bad morphological and hydrological condition, the increasing population tension, industrial and economical consisting development and the social continuous change.
To avoid and prevent disasters occuring, we must set in order to the watershed systematically and build soil and water conservation project in suitable place. Usually, we estimate the design runoff by Rational formula Q=(1/360)*CIA, and the key of successfully estimation of runoff is runoff coefficient C.
This study use the image that was collected from the SPOT satellite, first to proceed image, secondary to analyze, and then use SCS CN approach of U.S. Soil Conservation Service, in order to conduct the situation of land use, the water content of soil, and the density of vegetation covering in the watershed. After combining by GIS, we can find the corresponding SCS curve number in every grid, and runoff coefficient of four seasons in the watershed. We found that the runoff coefficient is very high in summer and fall because of the rainfall those caused in West-South monsoon and typhoon. And in winter, result from the East-North monsoon in north of Taiwan, the runoff coefficient is higher than any other places in Taiwan. The results of this study will be available for people to refer when they will design soil and water conservation engineering constructions and to research on remote sensing hydrology.

因此,為避免及預防災害繼續發生,必須有系統地進行集水區整治並於合適地點施設水土保持治理工程,其設計尺寸則需依各迴歸年降雨強度所對應之逕流量。常用者多以合理化公式 Q=(1/360)*CIA 推估其設計逕流量,而公式中之逕流係數C乃洪峰逕流量估計成敗之關鍵所在。
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