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Electronic journal of the International Association
for Environmental Hydrology
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JEH Volume 8 (2000), Paper 7, May 2000
Posted May
16, 2000
A SPATIALLY VARIED UNIT HYDROGRAPH MODEL
M. Hubail Ajward, Universiti Kebangsaan Malaysia,
Selangor, Malaysia
I. Muzik, University of Calgary, Calgary, Canada
ABSTRACT
In the recent past, instantaneous unit hydrographs based on geomorphology
have been proposed as a tool to produce flood hydrographs from rainfall.
This paper presents a flood hydrograph simulation model, formulated on
the concept of a spatial unit hydrograph derived from a deterministic direct
hydraulic simulation approach. The theoretical basis of the model is the
time-area method for unit hydrograph derivation. The model employs a cell
structure and routes the spatially distributed excess rainfall from one
cell to the other following the maximum downslope direction to the watershed
outlet. Application of the model is demonstrated by an example using data
from a 230 km2 watershed located on the eastern slopes of the
Canadian Rockies in Alberta, Canada. The spatial unit hydrographs gave
excellent results in simulating the observed flood hydrographs indicating
the potential of this model as a useful tool for flood hydrograph estimation.
Reference: Ajward, M.H. and I. Muzik; A Spatially Varied
Unit Hydrograph Model, Journal of Environmental Hydrology, Vol. 8,
Paper 7, May 2000.
M.H. Ajward
Dept. of Civil and Structural Engineering
Universiti Kebangsaan Malaysia
43600 UKM Bangi, Selangor Darul Ehsan
Malaysia
E-mail: ajward@eng.ukm.my