H2U : a transfer function model using fractal characteristics of the hydrographic network

Gatot Sumarjo I., Duchesne J., Perez Pascal. 1997. H2U : a transfer function model using fractal characteristics of the hydrographic network. In : Advances and Applications for Management and Decision Making. McDonald A.D. (ed.), McAleer M. (ed.). s.l. : Modelling and Simulation Society of Australia, 470-478. ISBN 0 86422 826 0 International Congress on Modelling and Simulation, Canberra, Australie, 8 Décembre 1997/11 Décembre 1997.

Autre titre : H2U : un modèle de transfert de fonction utilisant les caractéristiques fractales du réseau hydrographique

Résumé : Flood simulation using a conventional Unit Hydrograph Model has to calibrated with an already existing data set. This is a major constrain for the extension of relevant flooding early warning systems. Many attempts have been carried out in order to link the hydrographic parameters to the characteristics of the watershed. The transfer function proposed hereafter, called H2u (hydrogramme unitaire universel), is based on the description of the hydrographic network through a fractal approach. It is demonstrated that the parameters given by the fractal approach are related to the parameters used in the NASH's Instantaneous Unit Hydrograph Theory. The advantage of such as model is that it does not require any calibration : the two parameters have simply to be extracted from a precise map of the hudrographic network. After promising results in Europa and Africa, this model has been validated on the main Kali Garang watershed and on three sub watersheds in Central Java, Indonesia. Tha Kali Garang area is characterized by steep slopes with very short streams and by rapidly increasing impervious areas such as housing, factories, roads and other facilities. According to the existing rainfall and discharge data, flash-floods threaten the downstream provincial capital, Semarang, located on the coastal plain. The results of simulation show very closematching between the calculated hydrographs and the observed ones. This model needs a precise description of the rainfall pattern and of the land use characteristics.

Mots-clés Agrovoc : hydrographie, rivière, débit, mesure (activité), transport dans le sol, circulation de l'eau, modèle de simulation

Mots-clés géographiques Agrovoc : Java

Classification Agris : P10 - Ressources en eau et leur gestion

Auteurs et affiliations

• Gatot Sumarjo I.
• Duchesne J.
• Perez Pascal, CIRAD-CA-VRM (IDN)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/389544/)

Métriques

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