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UNCERTAINTY ANALYSIS AND CALIBRATION OF SWAT MODEL FOR ESTIMATING IMPACTS OF CONSERVATION METHODS ON STREAMFLOW AND SEDIMENT YIELD IN THIKA RIVER CATCHMENT, KENYA

Ng’ang’a, Gathagu John ; Mutua, Benedict M. ; Mourad, Khaldoon A. LU and Oduor, Brian Omondi (2018) In International Journal of Hydrology Research 3(1). p.1-11
Abstract
Despite their imperative role in water resources management, distributed hydrological models like SWAT require calibration that can be challenging due to uncertainties of parameters involved. Prior to modelling of hydrological processes, these parameters and their uncertainty range need to be identified. The objective of this study was to conduct uncertainty analysis of hydrological processes and to calibrate the Soil and Water Assessment Tool (SWAT) for stream flow and sediment yield modelling in Thika River catchment. Sequential Uncertainty Fitting program (SUFI-2) was used to conduct sensitivity and uncertainty analysis. Stream flow was calibrated and validated between the years 1998 to 2013 for gauging stations 4CB05 and 4CB04.... (More)
Despite their imperative role in water resources management, distributed hydrological models like SWAT require calibration that can be challenging due to uncertainties of parameters involved. Prior to modelling of hydrological processes, these parameters and their uncertainty range need to be identified. The objective of this study was to conduct uncertainty analysis of hydrological processes and to calibrate the Soil and Water Assessment Tool (SWAT) for stream flow and sediment yield modelling in Thika River catchment. Sequential Uncertainty Fitting program (SUFI-2) was used to conduct sensitivity and uncertainty analysis. Stream flow was calibrated and validated between the years 1998 to 2013 for gauging stations 4CB05 and 4CB04. Manual
sediments calibration was achieved by constraining the MUSLE parameters using the bathymetric survey data. Two uncertainty indices, p and r factor, were obtained as 0.72 and 0.65, 0.65 and 0.45 during calibration and validation, respectively. Statistical
performance indicators showed a good match between the observed and simulated values which indicated that the model was well calibrated for simulation of stream flow and sediments yield in the catchment. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Uncertainty, Sensitivity, SWAT, Streamflow, Sediment yield, Calibration, validation
in
International Journal of Hydrology Research
volume
3
issue
1
pages
12 pages
DOI
10.18488/journal.108.2018.31.1.11
language
English
LU publication?
yes
id
a90583f7-7750-4d79-8bbf-afb06eb2dfd6
date added to LUP
2018-03-14 09:25:18
date last changed
2018-12-04 14:40:11
@article{a90583f7-7750-4d79-8bbf-afb06eb2dfd6,
  abstract     = {Despite their imperative role in water resources management, distributed hydrological models like SWAT require calibration that can be challenging due to uncertainties of parameters involved. Prior to modelling of hydrological processes, these parameters and their uncertainty range need to be identified. The objective of this study was to conduct uncertainty analysis of hydrological processes and to calibrate the Soil and Water Assessment Tool (SWAT) for stream flow and sediment yield modelling in Thika River catchment. Sequential Uncertainty Fitting program (SUFI-2) was used to conduct sensitivity and uncertainty analysis. Stream flow was calibrated and validated between the years 1998 to 2013 for gauging stations 4CB05 and 4CB04. Manual<br/>        sediments calibration was achieved by constraining the MUSLE parameters using the bathymetric survey data. Two uncertainty indices, p and r factor, were obtained as 0.72 and 0.65, 0.65 and 0.45 during calibration and validation, respectively. Statistical<br/>performance indicators showed a good match between the observed and simulated values which indicated that the model was well calibrated for simulation of stream flow and sediments yield in the catchment.},
  author       = {Ng’ang’a, Gathagu John and Mutua, Benedict M.  and Mourad, Khaldoon A. and Oduor, Brian Omondi },
  language     = {eng},
  month        = {03},
  number       = {1},
  pages        = {1--11},
  series       = {International Journal of Hydrology Research},
  title        = {UNCERTAINTY ANALYSIS AND CALIBRATION OF SWAT MODEL FOR ESTIMATING IMPACTS OF CONSERVATION METHODS ON STREAMFLOW AND SEDIMENT YIELD IN THIKA RIVER CATCHMENT, KENYA},
  url          = {http://dx.doi.org/10.18488/journal.108.2018.31.1.11},
  doi          = {10.18488/journal.108.2018.31.1.11},
  volume       = {3},
  year         = {2018},
}