| Autor: |
Indah Kusuma Hidayati, null Suhardjono, Donny Harisuseno, Agus Suharyanto |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Journal of Southwest Jiaotong University. 57:664-672 |
| ISSN: |
0258-2724 |
| DOI: |
10.35741/issn.0258-2724.57.1.59 |
| Popis: |
Initial abstraction (Ia) is one of the key parameters used in the well-known SCS-CN rainfall-runoff relationship method. The Ia parameter, which is recognized to have a relationship with runoff time concentration (tc) is frequently associated with ponding time (tp). The present study described a new approach to estimate Ia and tp through overlaying between rainfall intensity (i) and infiltration rate (f) curves. The infiltration rate measurement was established at thirteen (13) measurement points using double-ring infiltrometer while the hourly duration (t) and annual maximum daily rainfall data for 2009 – 2019 were used to determine rainfall hyetograph (i). The observed initial abstraction (Iaobs) and ponding time (tpobs) were obtained from the measured infiltration data at each point of infiltration measurement while the empirical initial abstraction (Iaemp) and ponding time (tpemp) were estimated by the method of overlaying between rainfall hyetograph and infiltration rate curves. The study found that the variabilities of Ia and tp were highly induced by the varying of infiltration rate (f) and rainfall intensity (i). The reliability analysis demonstrated that there is an intense association between Iaobs and Iaemp, as well as tpobs and tpemp which was indicated by the high value of the determination coefficient (R2). The results confirmed that the values of Iaemp and tpemp derived by overlaying curve of rainfall hyetograph and infiltration rate show a good agreement with Ia and tp from the observation (Iaobs, tpobs). Thus, it is reliable for estimating Ia and tp in the research location. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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