JpGU-AGU Joint Meeting 2020

Presentation information

[E] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-HW Hydrology & Water Environment

[A-HW30] Hydrology & Water Environment

convener:Ayumi Kotani(Graduate School of Bioagricultural Sciences, Nagoya University), Takeshi Hayashi(Faculty of Education and Human Studies, Akita University), Keisuke Fukushi(Institute of Nature & Environmental Technology, Kanazawa University), Masahiro Tanoue(School of Engineering, The University of Tokyo)

[AHW30-14] Advantages of continuous modelling for design hydrograph estimation in small and ungauged basins

*Salvatore Grimaldi1,4, Maria Cristina Rulli2, Aldo Fiori3, Elena Volpi3 (1.Università degli Studi della Tuscia, Italy, 2.Politecnico di Milano, Italy, 3.Universita' Roma Tre, Italy, 4.International Association of Hydrological Sciences)

Keywords:design hydrograph, event-based approach, Continuous modelling, rainfall-runoff modelling.

Estimating the design hydrograph (DH) is a crucial problem in practical hydrology and hydraulics. The development of reliable DHs is particularly challenging in small and ungauged basins due to the lack of observed discharge data that are needed for calibrating advanced models. For such basins, the modeler is often forced to adopt simple and conceptual modelling like the so called event-based approach. It consists in selecting a design rainfall event, which is related to an assigned return period, estimating the rainfall excess and then transforming it into the DH. In recent years, the continuous modelling approach was introduced. This relies on generating a long synthetic rainfall time series at sub-daily resolution that feeds a continuous rainfall–runoff model. Then, a discharge time series is produced that allows for estimating the DH. In this work, we would like to emphasize the added value of the continuous modelling approach in providing a more reliable estimation of the DH.