Browsing by Author "Huang, W. S. C."

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Assessing curve number uncertainty for green roofs in a stochastic environment
(2018-01-01)
Huang, W. S. C.
;
You, L. W.
;
Tung, Y. K.
;
Yoo, C. S.
;
防災與水環境研究中心
Curve number (CN) is well-known by hydrologists for estimating rainfall induced runoff from a catchment. It can also be used as an indicator for measuring the impact of engineering or non-engineering measures on the runoff production in a catchment. In this study, a method is presented to quantify the uncertainty of CN for hydrologic performance of a green roof system. Latin hypercube sampling approach, coupled with the antithetic variate technique, is used to achieve efficient and accurate quantification of the uncertainty features of CN for a green roof system. Elements in green roofs subject to uncertainty considered are rainfall characteristics (i.e. amount and inter-event dry period), soil-plant-climate factors (i.e. field capacity, wilting point, interception, evapotranspiration rate), and model error in SCS I-a-S relation. Numerical study shows that model error in SCS I-a-S relation has the dominant effect on the uncertainty features of CN for green roof performance.