Design hydrograph estimation in small and ungauged basins: a comparative assessment of event based (EBA4SUB) and continuous (COSMO4SUB) modelling approaches
| Autor: | Andrea Petroselli, R. Piscopia, Salvatore Grimaldi, Flavia Tauro |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Estimation
cosmo4sub Computer Networks and Communications Continuous modelling Event based continuous modelling Environmental engineering Hydrograph TA170-171 computer.software_genre Environmental technology. Sanitary engineering rainfall-runoff modelling Hardware and Architecture eba4sub Environmental science Data mining computer event-based approach Software TD1-1066 |
| Zdroj: | Acta Scientiarum Polonorum. Formatio Circumiectus, Vol 18, Iss 4, Pp 113-124 (2020) |
| ISSN: | 1644-0765 |
| Popis: | Aim of the study: Aim of the study is to provide a comparative assessment of event based (EBA4SUB) and continuous (COSMO4SUB) modelling approaches for rainfall-runoff modeling for small and ungauged basins, focusing on the influence of the Antecedent Moisture Condition (AMC) of the soil on the estimated design peak discharge. Material and methods: The event based approach is the EBA4SUB software. It consists in selecting a design rainfall event, in estimating the rainfall excess and in transforming it into the direct hydrograph. The continuous approach is the COSMO4SUB framework. It consists in generating a long synthetic rainfall time series at sub-daily resolution that feeds a continuous rainfall–runoff model. Then, a discharge time series is determined, providing the estimation of the runoff and the related peak discharge. Results and conclusions: Results show the critical role of antecedent moisture condition (AMC) and how subjective the event-based approach is for determining the design hydrograph and peak discharge. In the event-based approach, AMC is arbitrarily selected by the analyst, while in the continuous modelling it is automatically determined using the synthetic rainfall input. Our findings indicate that the event-based approach systematically leads to a considerable overestimation of floods if AMC III (wet soil) is assumed or to a slight underestimation of floods if AMC II (average condition for soil humidity) is selected. |
| Databáze: | OpenAIRE |
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