Hydrological modelling of Ethiopian catchments using limited data
2009 (English)In: Hydrological Processes, ISSN 0885-6087, E-ISSN 1099-1085, Vol. 23, no 23, 3401-3408 p.Article in journal (Other academic) Published
The hydrological component of Soil and Water Assessment Tool (SWAT) model is adapted for Ethiopian catchments based on primary knowledge of the coherence spectrum between dis-charge and runoff. The implication is that only periods longer than about 50 days can be reliably represented in the model based on the available data. An improved method reflecting soil water retention in terms of cumulative evapotranspiration, so that its value is less dependent on soil storage and more dependent on antecedent climate, is used. The improved method is attractive for Ethiopian conditions due to limited soil data availability and the fact that the time-scale of cumulative evaporation can be evaluated over periods longer than 50 days. The spectrum analysis was done on the available nearby climatic data in three watersheds in Ethiopia to analyze the effects of data limitation on the temporal and spatial scales suitable to account for in comparta-mentalized runoff models. The time scales of SWAT for the surface runoff and groundwater flow response were constrained so as to be consistent with the results of the spectrum analysis. The performance of the SWAT model to predict daily stream flow response was compared to the Seasonal Model (SM) and the Original Linear Purturbation Model (OLPM) both of which need previous seasonal behavior of the stream flow.
Place, publisher, year, edition, pages
2009. Vol. 23, no 23, 3401-3408 p.
SWAT; SM; OLPM; Spectral analysis; Ethiopian catchments
IdentifiersURN: urn:nbn:se:kth:diva-8249DOI: 10.1002/hyp.7470ISI: 000271452600013ScopusID: 2-s2.0-70649107951OAI: oai:DiVA.org:kth-8249DiVA: diva2:13520
QC 20100827. Updated from submitted to published, 20120315. Previous title: Hydrological modeling under limited data conditions in Ethiopian catchments2008-04-222008-04-222012-03-15Bibliographically approved