H2U : a transfer function model using fractal characteristics of the hydrographic network
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.
| Main Authors: | , , |
|---|---|
| Format: | conference_item biblioteca |
| Language: | eng |
| Published: |
Modelling and Simulation Society of Australia
|
| Subjects: | P10 - Ressources en eau et leur gestion, hydrographie, rivière, débit, mesure (activité), transport dans le sol, circulation de l'eau, modèle de simulation, http://aims.fao.org/aos/agrovoc/c_3727, http://aims.fao.org/aos/agrovoc/c_6617, http://aims.fao.org/aos/agrovoc/c_2989, http://aims.fao.org/aos/agrovoc/c_4668, http://aims.fao.org/aos/agrovoc/c_7202, http://aims.fao.org/aos/agrovoc/c_8314, http://aims.fao.org/aos/agrovoc/c_24242, http://aims.fao.org/aos/agrovoc/c_4043, |
| Online Access: | http://agritrop.cirad.fr/389544/ http://agritrop.cirad.fr/389544/1/Sumarjo.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | 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. |
|---|