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Hydrological modelling of Ethiopian catchments using limited data
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Hydraulic Engineering.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Hydraulic Engineering.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Hydraulic Engineering.
SWECO Environment AB.
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
Abstract [en]

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.
Keyword [en]
SWAT; SM; OLPM; Spectral analysis; Ethiopian catchments
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:kth:diva-8249DOI: 10.1002/hyp.7470ISI: 000271452600013Scopus ID: 2-s2.0-70649107951OAI: oai:DiVA.org:kth-8249DiVA: diva2:13520
Note
QC 20100827. Updated from submitted to published, 20120315. Previous title: Hydrological modeling under limited data conditions in Ethiopian catchmentsAvailable from: 2008-04-22 Created: 2008-04-22 Last updated: 2012-03-15Bibliographically approved
In thesis
1. Modeling flow and sediment transport in water bodies and watersheds
Open this publication in new window or tab >>Modeling flow and sediment transport in water bodies and watersheds
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The research focus is on the various modeling aspects of flow and sediment transport in water bodies and watersheds. The interaction of flow with a mobile bed involves a complex process in which various turbulent scales characterized by coherent structures cause a chaotic sediment motion. In many rivers and natural waterways secondary flows that are dominating flow struc-tures bring about more complications. In estuaries and open waterbodies thermal stratification and internal mixing control the flow structure besides the flow interaction with the mobile bed. To adequately model these processes 3D coupled flow and transport models are needed. The research is based on use and adaptation of open source codes for 3D hydrodynamic and sediment transport model known as Estuarine Coastal Ocean Model (ECOMSED) and the Soil and Water Assessment Tool (SWAT) model. A bed load transport model was developed and coupled to ECOMSED. The flow and sediment transport characteristics in a curved channel and a river reach were successfully captured by the model. Improvements in ECOMSED were made to study the effect of wind and basin bathymetry on mixing and flow exchange between two estuaries. Using spectral analysis the hydrological component of SWAT model was investigated for its applicability under limited data conditions in three Ethiopian catchments.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. viii, 21 p.
Series
Trita-LWR. PHD, ISSN 1650-8602 ; 1039
Keyword
Bed load transport model, ECOMSED, Hydrology, Hydrodynamics, Spectral Analysis, SWAT
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-4703 (URN)978-91-7178-925-9 (ISBN)
Public defence
2008-05-08, F3, Lindstedtvägen 26, Kungliga Tekniska högskolan | Adress SE-100 44 Stockholm | Telefon +46 8 790 60 00, KTH, 10:00
Opponent
Supervisors
Note
QC 20100827Available from: 2008-04-22 Created: 2008-04-22 Last updated: 2010-08-27Bibliographically approved

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