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Effects of different retention parameter estimation methods on the prediction of surface runoff using the SCS curve number method
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering. (Environmental Management and Assessment)
Stockholm University.
Florida International University, Departmet of Earth and Environment.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.ORCID iD: 0000-0002-1640-8946
2014 (English)In: Water resources management, ISSN 0920-4741, E-ISSN 1573-1650, Vol. 28, no 10, 3241-3254 p.Article in journal (Refereed) Published
Abstract [en]

Quantifying different hydrological components is an initial step for sustainable water resources planning and management. One rising concern is the conflict between the environment, hydropower and agriculture mainly in lowland areas where a large share of the base flows need to be abstracted. The Soil and Water Assessment Tool (SWAT) model was used to understand the hydrological processes of the Upper Awash River Basin with the emphasis on analyzing the different options for surface runoff generation using the Soil Conservation Service (SCS) Curve Number (CN) method. In this study, SWAT was applied incorporating two methods for estimating the retention parameter (S) for the SCS-CN method. The first allowed S to vary with soil profile moisture content (SM method) and the second allowed S to vary with accumulated plant evapotranspiration (PT method). Hydrograph comparison indicated that the PT method was better in simulating peak flows while the SM method was better in simulating the low flows. While the predicted stream flow hydrographs showed an agreement between the two methods, the simulated annual water balance indicated a disagreement in quantifying the different hydrological components. After evapotranspiration, base flow was the dominant component simulated in the SM method whereas surface runoff was the foremost in the PT method simulation. The analysis indicated that care must be taken when selecting an appropriate tool for quantifying hydrologic system to be used for decision making especially for un-gauged catchments where validation of model results is not possible.

Place, publisher, year, edition, pages
2014. Vol. 28, no 10, 3241-3254 p.
Keyword [en]
sustainable water use, water balance components, SWAT, retention parameter, Awash River Basin
National Category
Oceanography, Hydrology, Water Resources Environmental Sciences
Research subject
Land and Water Resources Engineering
Identifiers
URN: urn:nbn:se:kth:diva-33624DOI: 10.1007/s11269-014-0674-3ISI: 000338651100032Scopus ID: 2-s2.0-84903616305OAI: oai:DiVA.org:kth-33624DiVA: diva2:416614
Funder
StandUpSida - Swedish International Development Cooperation Agency, SWE-2011-066
Note

QC 20140812

Available from: 2011-05-12 Created: 2011-05-12 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Hydrological modeling as a tool for sustainable water resources management: a case study of the Awash River Basin
Open this publication in new window or tab >>Hydrological modeling as a tool for sustainable water resources management: a case study of the Awash River Basin
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The growing pressure on the world‘s fresh water resources is enforced by population growth that leads to conflicts between demands for different purposes. A main concern on water use is the conflict between the environment and other purposes like hydropower, irrigation for agriculture and domestic and industry water supply, where total flows are diverted without releasing water for ecological conservation. As a consequence, some of the common problems related to water faced by many countries are shortage, quality deterioration and flood impacts. Hence, utilization of integrated water resources management in a single system, which is built up by river basin, is an optimum way to handle the question of water. However, in many areas, when planning for balancing water demands major gaps exist on baseline knowledge of water resources. In order to bridge these gaps, hydro-logical models are among the available tools used to acquire adequate understanding of the characteristics of the river basin. Apart from forecasting and predicting the quantity and quality of water for decision makers, some models could also help in predicting the impacts of natural and anthropogenic changes on water resources and also in quantifying the spatial and temporal availability of the resources. However, main challenges lie in choosing and utilizing these models for a specific basin and managerial plan. In this study, an analysis of the different types of models and application of a selected model to characterize the Awash River basin, located in Ethiopia, is presented. The results from the modeling procedure and the performance of the model are discussed. The different possible sources of uncertainties in the modeling process are also discussed. The results indicate dissimilar predictions in using different methods; hence proper care must be taken in selecting and employing available methods for a specific watershed prior to presenting the results to decision makers.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. x, 28 p.
Series
Trita-LWR. LIC, ISSN 1650-8629 ; 2056
Keyword
Hydrological characteristics, Distributed hydrological modeling, Rainfall-runoff correlation, Streamflow prediction, Sustainable water management, Awash River Basin
National Category
Oceanography, Hydrology, Water Resources
Identifiers
urn:nbn:se:kth:diva-33617 (URN)978-91-7501-021-2 (ISBN)
Presentation
2011-05-27, V2, KTH, Teknikringen 72, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20110516Available from: 2011-05-16 Created: 2011-05-12 Last updated: 2011-11-10Bibliographically approved

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Mörtberg, Ulla

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