Application of SWAT and Development of a Water Quality Title Predictive Model for Water Resources Management in Rural Basins( Dissertation_全文 ) Author(s) BAOBAB, KIBET KIMENGICH Citation 京都大学 Issue Date 2020-09-23 URL https://doi.org/10.14989/doctor.k22785 許諾条件により本文は2021-03-01に公開; "Temporal and spatial change of phosphate-phosphorus concentration and modeling with land-use variation in Sengari reservoir basin, Japan" B. K. Kimengich, J. Takeuchi, K.Goto and M. Fujihara ("Paddy and Water Environment", April 2019, Vol. 17, pp.131- 139). https://doi.org/10.1007/s10333-019-00705-6 The final publication is available at Springer via https://link.springer.com/article/10.1007/s10333-019-00705-6. Right "Applicability of SWAT Model for Streamflow Simulation in a Highly Managed Agricultural Watershed -Case Study: Yasu River Basin, Japan-" B. K. Kimengich, J. Takeuchi, and M. Fujihara ("Journal of Rainwater Catchment Systems", January 2018, Vol 23, No 2, pp. 19-27) https://doi.org/10.7132/jrcsa.23_2_19. The final publication is available at J-STAGE via https://www.jstage.jst.go.jp/article/jrcsa/23/2/23_23_2_19/_arti cle/-char/ja Type Thesis or Dissertation Textversion ETD Kyoto University Application of SWAT and Development of a Water Quality Predictive Model for Water Resources Management in Rural Basins 2020 BAOBAB KIBET KIMENGICH CONTENTS List of Tables .............................................................................................................. v List of Figures ......................................................................................................... vii Acknowledgments .....................................................................................................ix 1 Introduction ............................................................................................................... 1 1.1 Background ...................................................................................................... 1 1.2 Problem statement............................................................................................ 2 1.3 Importance of hydrological and water quality models .................................... 4 1.4 Objective .......................................................................................................... 5 1.5 Thesis structure ................................................................................................ 6 2 Literature Review ...................................................................................................... 9 2.1 Model introduction .......................................................................................... 9 2.2 History of hydrological models and water quality models .............................. 9 2.3 Different groups of hydrological models ....................................................... 10 2.4 Physical based models ................................................................................... 11 2.5 Distributed and semi-distributed models ....................................................... 13 2.6 Water quality models ..................................................................................... 13 2.7 Examples of water quality models ................................................................. 15 2.8 SWAT model ................................................................................................. 16 3 Applicability of SWAT Model for Streamflow Simulation in a Highly Managed Agricultural Watershed .......................................................................................... 19 3.1 Introduction .................................................................................................... 19 3.2 Methodology .................................................................................................. 21 3.2.1 Study area .............................................................................................. 21 3.2.2 Irrigation management ........................................................................... 24 ii CONTENTS 3.2.3 SUFI -2 .................................................................................................. 25 3.3 Results and discussions .................................................................................. 27 3.3.1 Sensitivity analysis ................................................................................ 27 3.3.2 Calibration, validation and uncertainty analysis .................................... 27 3.4 Conclusion ..................................................................................................... 33 4 Temporal and Spatial Change of Phosphate Phosphorus Concentration and Modeling with Land-use Variation in the Sengari Reservoir Basin, Japan....... 35 4.1 Introduction .................................................................................................... 35 4.2 Methodology .................................................................................................. 38 4.2.1 Study area .............................................................................................. 38 4.2.2 Data collection and analysis .................................................................. 38 4.2.3 Linear multiple regression model .......................................................... 40 4.3 Results and discussions .................................................................................. 42 4.3.1 Annual average ...................................................................................... 42 4.3.2 Irrigation and non-irrigation period analysis ......................................... 48 4.4 Conclusion ..................................................................................................... 57 5 Assessing the Impact of Land Cover Change on Phosphate Phosphorus Load in the Hatsuka River Basin ......................................................................................... 59 5.1 Introduction .................................................................................................... 59 5.2 Methodology .................................................................................................. 60 5.2.1 Study area .............................................................................................. 60 5.2.2 Water quality predictive model and scenarios ....................................... 62 5.3 Results and discussions .................................................................................. 63 5.3.1 Non-point source ................................................................................... 63 5.3.2 Scenario testing ...................................................................................... 65 5.4 Conclusion ..................................................................................................... 67 6 Modeling Non-point Source Phosphorus Load on a Rural Basin with OWTS . 69 6.1 Introduction .................................................................................................... 69 6.2 Methodology .................................................................................................. 71 6.2.1 Phosphorus in SWAT model ................................................................. 71 6.2.2 Study area and datasets .......................................................................... 72 6.2.3 Simulation .............................................................................................. 74 CONTENTS iii 6.2.4 Model evaluation ................................................................................... 75 6.3 Results and discussions .................................................................................. 76 6.3.1 Calibration and validation ...................................................................... 76 6.3.2 NPS pollution load ................................................................................. 81 6.3.3 Septic tank ............................................................................................. 82 6.4 Conclusion ..................................................................................................... 84 7 Summation ............................................................................................................... 85 7.1 Summary and conclusion ............................................................................... 85 7.2 Future prospects ............................................................................................. 87 8 References ................................................................................................................. 89 LIST OF TABLES 3.1 Significant parameters in the study area ............................................................... 28 3.2 Soil conservation service runoff curve number for different land-use parameter 28 3.3 Soil saturated hydraulic conductivity ................................................................... 29 3.4 Other parameters ................................................................................................... 29 3.5 Performance evaluation and uncertainty analysis ................................................ 32 4.1 Percentage of land-use ratio in each subbasin ....................................................... 39 4.2 Data collection dates .............................................................................................. 40 4.3 Data collection dates .............................................................................................