https://scholars.lib.ntu.edu.tw/handle/123456789/571771
標題: | Rainstorm magnitude likely regulates event water fraction and its transit time in mesoscale mountainous catchments: Implication for modelling parameterization | 作者: | Lee J.-Y Shih Y.-T Lan C.-Y Lee T.-Y Peng T.-R Lee C.-T Huang J.-C. JR-CHUAN HUANG |
關鍵字: | Catchments; Groundwater; Groundwater flow; Hurricanes; Rain; Runoff; Sensitivity analysis; Thunderstorms; Controlling factors; Global sensitivity analysis; Hydrograph separation; Mean transit time; Mesoscale catchments; Parameter sensitivities; Preferential flows; Rainfall intensity; Parameter estimation; groundwater; hydrograph; parameterization; precipitation intensity; rainfall-runoff modeling; rainstorm; sensitivity analysis; streamwater; subsurface flow; typhoon; Taiwan | 公開日期: | 2020 | 卷: | 12 | 期: | 4 | 來源出版物: | Water (Switzerland) | 摘要: | Event water transit time estimation has rarely been done for violent rainstorms (e.g., typhoons) in steep and fractured mountainous catchments where the range of transit time, potential controlling factors, and the validity of time-invariant parametrization are unclear. Characterized by steep landscape and torrential typhoon rainfall, Taiwan provides great opportunities for inquiring into the above questions. In this study, the hydrometrics and δ18O in rainwater and streamwater were sampled with a ~3-h interval for six typhoon events in two mesoscale catchments. The TRANSEP (transfer function hydrograph separation) model and global sensitivity analysis were applied for estimating mean transit time (MTTew) and fraction (Few) of event water and identifying the chronosequent parameter sensitivity. Results showed that the MTTew and Few varied from 2.0 to 11.0 h and from 0.2 to 0.8, respectively. Our MTTew in the mesoscale catchments is comparable with that in microscale catchments, showing a fast rainfall-runoff transfer in our steep catchments. The average rainfall intensity is a predominant indicator, which negatively affects the MTTew and positively affects the Few, likely activating preferential flow-paths and quickly transferring event water to the stream. Sensitivity analysis among inter-and intra-events demonstrates that parameter sensitivity is event-dependent and time-variant. A quick and massive subsurface flow without distinct mixing with groundwater would be triggered during large rainstorms, suggesting that time-variant parameterization should be particularly considered when estimating the MTTew in steep and fractured catchments at rainstorm scale. ? 2020 by the authors. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85084647757&doi=10.3390%2fW12041169&partnerID=40&md5=9049a7991a8d0ac2fe19d08330cbb4a3 https://scholars.lib.ntu.edu.tw/handle/123456789/571771 |
ISSN: | 20734441 | DOI: | 10.3390/W12041169 |
顯示於: | 地理環境資源學系 |
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