All Stories

  1. Evaluating the potential of nanofiltration membranes for removing ammonium, nitrate, and nitrite in drinking water sources

    Article • Water Research, October 2023, Elsevier

    Prof., Dr. Kei Nakagawa

  2. Stable N and O isotopic indicators coupled with social data analysis revealed long-term shift in the cause of groundwater nitrate pollution: Insights into future water resource management

    Article • Ecological Indicators, October 2023, Elsevier

    Prof., Dr. Kei Nakagawa

  3. Urban Water-Related Problems

    Article • Water, September 2023, MDPI AG

    Prof., Dr. Kei Nakagawa

  4. Hydrogeochemical factors controlling the fluoride concentration in spring/groundwater in Aso caldera in the volcanic region, Japan

    Article • Environmental Earth Sciences, June 2023, Springer Science + Business Media

    Prof., Dr. Kei Nakagawa

  5. Coprostanol adsorption behavior in agricultural soil, riverbed sediment, and sand

    Article • Journal of Environmental Chemical Engineering, June 2023, Elsevier

    Prof., Dr. Kei Nakagawa

  6. Evaluating solar photovoltaic power efficiency based on economic dimensions for 26 countries using a three-stage data envelopment analysis

    Article • Applied Energy, April 2023, Elsevier

    Prof., Dr. Kei Nakagawa

  7. Toxicity and source identification of pollutants in an urban river in Bangladesh

    Article • Environmental Earth Sciences, March 2023, Springer Science + Business Media

    Prof., Dr. Kei Nakagawa

  8. PFAS in the Drinking Water Source: Analysis of the Contamination Levels, Origin and Emission Rates

    Article • Water, December 2022, MDPI AG

    Prof., Dr. Kei Nakagawa

  9. Groundwater Quality and Potential Pollution in the Southern Shimabara Peninsula, Japan

    Article • Water, December 2022, MDPI AG

    Prof., Dr. Kei Nakagawa

  10. Effects of the Japanese Nitrate Directive Plan (NDP) to curb groundwater nitrate-nitrogen content in the Miyakonojo River basin

    Article • Journal of Hydrology, December 2022, Elsevier

    Prof., Dr. Kei Nakagawa

  11. Spatial Distribution and Source Identification of Water Quality Parameters of an Industrial Seaport Riverbank Area in Bangladesh

    Article • Water, April 2022, MDPI AG

    Prof., Dr. Kei Nakagawa

  12. Early-stage anaerobic zone formation by organic eluate from wood in soil

    Article • SOILS AND FOUNDATIONS, April 2022, Elsevier

    Prof., Dr. Kei Nakagawa

  13. Distribution of heavy metals and related health risks through soil ingestion in rural areas of western Japan

    Article • Chemosphere, March 2022, Elsevier

    Prof., Dr. Kei Nakagawa

  14. Is road-side fishpond water in Bangladesh safe for human use? An assessment using water quality indices

    Article • Environmental Challenges, January 2022, Elsevier

    Prof., Dr. Kei Nakagawa

  15. Using a linear discriminant analysis (LDA)-based nomenclature system and self-organizing maps (SOM) for spatiotemporal assessment of groundwater quality in a coastal aquifer

    Article • Journal of Hydrology, December 2021, Elsevier

    Prof., Dr. Kei Nakagawa

  16. The Relative Importance of Determinants of the Solar Photovoltaic Industry in China: Analyses by the Diamond Model and the Analytic Hierarchy Process

    Article • Energies, October 2021, MDPI AG

    Prof., Dr. Kei Nakagawa

  17. Suppression of Alkalization in Rainwater Regulating Reservoir by Shading on a Pilot Scale

    Article • Water, September 2021, MDPI AG

    Prof., Dr. Kei Nakagawa

  18. Groundwater nitrogen response to regional land-use management in South Japan

    Article • Environmental Earth Sciences, September 2021, Springer Science + Business Media

    Prof., Dr. Kei Nakagawa

  19. Spatial Characteristics of Groundwater Chemistry in Unzen, Nagasaki, Japan

    Article • Water, February 2021, MDPI AG

    Prof., Dr. Kei Nakagawa

  20. Spatiotemporal variation of nitrate concentrations in soil and groundwater of an intensely polluted agricultural area

    Article • Scientific Reports, January 2021, Springer Science + Business Media

    Prof., Dr. Kei Nakagawa

  21. Effects of the Japanese 2016 Kumamoto Earthquake on Nitrate Content in Groundwater Supply

    Article • Minerals, December 2020, MDPI AG

    Prof., Dr. Kei Nakagawa

  22. INSIDE: An efficient guide for sustainable remediation practice in addressing contaminated soil and groundwater

    Article • The Science of The Total Environment, October 2020, Elsevier

    Prof., Dr. Kei Nakagawa

  23. A Retardation Factor Considering Solute Transfer Between Mobile and Immobile Water in Porous Media

    Article • Environmental Modeling & Assessment, September 2020, Springer Science + Business Media

    Prof., Dr. Kei Nakagawa

  24. Impact of the Sediment Organic vs. Mineral Content on Distribution of the Per- and Polyfluoroalkyl Substances (PFAS) in Lake Sediment

    Article • International Journal of Environmental Research and Public Health, August 2020, MDPI AG

    Prof., Dr. Kei Nakagawa

  25. Use of Heavy Metal Content and Modified Water Quality Index to Assess Groundwater Quality in a Semiarid Area

    Article • Water, April 2020, MDPI AG

    Prof., Dr. Kei Nakagawa

  26. Describing coseismic groundwater level rise using tank model in volcanic aquifers, Kumamoto, southern Japan

    Article • Journal of Hydrology, March 2020, Elsevier

    Prof., Dr. Kei Nakagawa

  27. Earthquake effects on artificial groundwater recharge efforts in south Japan

    Article • Environmental Earth Sciences, March 2020, Springer Science + Business Media

    Prof., Dr. Kei Nakagawa

  28. Temporal characteristics of groundwater chemistry affected by the 2016 Kumamoto earthquake using self-organizing maps

    Article • Journal of Hydrology, March 2020, Elsevier

    Prof., Dr. Kei Nakagawa

  29. Use of sterols to monitor surface water quality change and nitrate pollution source

    Article • Ecological Indicators, December 2019, Elsevier

    Prof., Dr. Kei Nakagawa

  30. Analysis of earthquake-induced groundwater level change using self-organizing maps

    Article • Environmental Earth Sciences, July 2019, Springer Science + Business Media

    Prof., Dr. Kei Nakagawa

  31. Social sustainability assessment of groundwater resources: A case study of Hanoi, Vietnam

    Article • Ecological Indicators, October 2018, Elsevier

    Prof., Dr. Kei Nakagawa

  32. Hydrogeochemical evolution of groundwater in a Quaternary sediment and Cretaceous sandstone unconfined aquifer in Northwestern China

    Article • Environmental Earth Sciences, September 2018, Springer Science + Business Media

    Prof., Dr. Kei Nakagawa

  33. Surface water chemistry and nitrate pollution in Shimabara, Nagasaki, Japan

    Article • Environmental Earth Sciences, May 2018, Springer Science + Business Media

    Prof., Dr. Kei Nakagawa

  34. Modeling of Salt Sorption in Volcanic Ash Soil

    Article • Communications in Soil Science and Plant Analysis, November 2017, Taylor & Francis

    Prof., Dr. Kei Nakagawa

  35. On the use of coprostanol to identify source of nitrate pollution in groundwater

    Article • Journal of Hydrology, July 2017, Elsevier

    Prof., Dr. Kei Nakagawa

  36. Recovery of groundwater in the Sanriku region contaminated by the tsunami inundation from the 2011 Tohoku earthquake

    Article • Environmental Earth Sciences, March 2017, Springer Science + Business Media

    Prof., Dr. Kei Nakagawa

  37. Sustainability Assessment of Groundwater Resources in Hanoi, Vietnam from a Social Perspective

    Article • Journal of Japan Society of Civil Engineers Ser G (Environmental Research), January 2017, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  38. STUDY ON STATISTICAL PROPERTIES OF DARCY VELOCITY DISTRIBUTION AND FORM OF WATER PATH IN NON-UNIFORM FIELD

    Article • Journal of Japan Society of Civil Engineers Ser B1 (Hydraulic Engineering), January 2017, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  39. Hydrogeological observations related to the decisions of groundwater management

    Article • Journal of Groundwater Hydrology, January 2017, Japanese Association of Groundwater Hydrology

    Prof., Dr. Kei Nakagawa

  40. HYDROGEOCHEMICAL ASSESSMENT OF GROUNDWATER QUALITY IN SHIMABARA, NAGASAKI, JAPAN

    Article • Journal of Japan Society of Civil Engineers Ser B1 (Hydraulic Engineering), January 2017, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  41. Grouping by Visual Appearance of Construction and Demolition Waste for Sorting Time Reduction with the Aim of Removing Asbestos-Containing Materials

    Article • International Journal of Waste Resources, January 2017, OMICS Publishing Group

    Prof., Dr. Kei Nakagawa

  42. Decomposition approach of the nitrogen generation process: empirical study on the Shimabara Peninsula in Japan

    Article • Environmental Science and Pollution Research, September 2016, Springer Science + Business Media

    Dr Hidemichi Fujii, Prof., Dr. Kei Nakagawa

  43. Groundwater geochemistry of a nitrate-contaminated agricultural site

    Article • Environmental Earth Sciences, August 2016, Springer Science + Business Media

    Prof., Dr. Kei Nakagawa

  44. Classification of groundwater chemistry in Shimabara, using self-organizing maps

    Article • Hydrology Research, July 2016, IWA Publishing

    Prof., Dr. Kei Nakagawa

  45. Spatial trends of nitrate pollution and groundwater chemistry in Shimabara, Nagasaki, Japan

    Article • Environmental Earth Sciences, January 2016, Springer Science + Business Media

    Prof., Dr. Kei Nakagawa

  46. Spatiotemporal distribution of areas of interest appeared in JAGH articles which include information on the local groundwater

    Article • Journal of Groundwater Hydrology, January 2016, Japanese Association of Groundwater Hydrology

    Prof., Dr. Kei Nakagawa

  47. CLASSIFICATION CHARACTERISTICS OF MULTIVARIATE ANALYSES FOR GROUNDWATER CHEMISTRY —CASE STUDY ON SHIMABARA CITY—

    Article • Journal of Japan Society of Civil Engineers Ser G (Environmental Research), January 2016, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  48. Potential map accuracy of groundwater nitrate load from agricultural activities in Shimabara City, Nagasaki Prefecture, Japan

    Article • Journal of Groundwater Hydrology, January 2015, Japanese Association of Groundwater Hydrology

    Prof., Dr. Kei Nakagawa

  49. ELECTRO-KINETIC REMEDIATION MODEL FOR CONTAMINATED SOIL AND GROUNDWATER

    Article • Journal of Japan Society of Civil Engineers Ser B1 (Hydraulic Engineering), January 2015, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  50. Classic ^|^amp; contemporary papers of groundwater science （3） How to evaluate appropriate dispersivity at the field scale

    Article • Journal of Groundwater Hydrology, January 2014, Japanese Association of Groundwater Hydrology

    Prof., Dr. Kei Nakagawa

  51. Groundwater, river water, and soil in the Minamisanriku town affected by the 2011 tsunami

    Article • Journal of Groundwater Hydrology, January 2014, Japanese Association of Groundwater Hydrology

    Prof., Dr. Kei Nakagawa

  52. Influence of oxygen flow rate and compost addition on reduction of organic matter in aerated waste layer containing mainly incineration residue

    Article • Journal of Environmental Sciences, January 2013, Elsevier

    Prof., Dr. Kei Nakagawa

  53. Effect of Tsunami induced by the 2011 off the Pacific coast of Tohoku Earthquake on groundwater

    Article • Journal of Groundwater Hydrology, January 2013, Japanese Association of Groundwater Hydrology

    Prof., Dr. Kei Nakagawa

  54. On the importance of hysteresis and heterogeneity in the numerical simulation of unsaturated flow

    Article • Hydrological Research Letters, January 2012, Japan Society of Hydrology and Water Resources

    Prof., Dr. Kei Nakagawa

  55. Modeling Solute Transport in Volcanic Ash Soils with Cation Exchange and Anion Retardation

    Article • Environmental Modeling & Assessment, May 2011, Springer Science + Business Media

    Prof., Dr. Kei Nakagawa

  56. Effects of Recharge Wells and Flow Barriers on Seawater Intrusion

    Article • Ground Water, February 2011, Wiley

    Prof., Dr. Kei Nakagawa

  57. Numerical study on quantitative evaluation of macroscopic disparsivity by using stochastic fractal model

    Article • Journal of Groundwater Hydrology, January 2011, Japanese Association of Groundwater Hydrology

    Prof., Dr. Kei Nakagawa

  58. NUMERICAL STUDY ON GROUNDWATER POLLUTION MECHANISM IN THE TWO SHIRASU PLATEAUS IN THE SAME CATCHMENT AREA

    Article • Journal of Japan Society of Civil Engineers Ser B1 (Hydraulic Engineering), January 2011, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  59. Modelling reactive solute transport from groundwater to soil surface under evaporation

    Article • Hydrological Processes, February 2010, Wiley

    Prof., Dr. Kei Nakagawa

  60. LABOLATORY EXPERIMENT AND NUMERICAL SIMULATION FOR SOLUTE TRANSPORT IN HETEROGENEOUS-UNSATURATED VERTICAL INFILTRATION FLOW FIELD

    Article • Doboku Gakkai Ronbunshuu B, January 2010, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  61. Laboratory-scale saltwater behavior due to subsurface cutoff wall

    Article • Journal of Hydrology, October 2009, Elsevier

    Prof., Dr. Kei Nakagawa

  62. Modeling the water budget in a deep caldera lake and its hydrologic assessment: Lake Ikeda, Japan

    Article • Agricultural Water Management, January 2009, Elsevier

    Prof., Dr. Kei Nakagawa

  63. WATER INFILTRATION ANALYSIS IN THE UNSATURATED-HETEROGENEOUS FIELD

    Article • Doboku Gakkai Ronbunshuu B, January 2008, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  64. LABORATORY EXPERIMENT ON REACTIVE TRANSPORT IN PHYSICALLY AND CHEMICALLY HETEROGENEOUS FIELD

    Article • PROCEEDINGS OF HYDRAULIC ENGINEERING, January 2008, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  65. Microscopic and macroscopic dispersions in convection-dispersion proc esses

    Article • Journal of Groundwater Hydrology, January 2008, Japanese Association of Groundwater Hydrology

    Prof., Dr. Kei Nakagawa

  66. Soil heterogeneity effects on acid flushing of lead-contaminated soil

    Article • Environmental Modeling & Assessment, February 2007, Springer Science + Business Media

    Prof., Dr. Kei Nakagawa

  67. Groundwater Simulation using Spreadsheets

    Article • Journal of Groundwater Hydrology, January 2007, Japanese Association of Groundwater Hydrology

    Prof., Dr. Kei Nakagawa

  68. WATER INFILTRATION INVESTIGATIONS IN UNSATURATED-HETEROGENEOUS FIELD BY TDR METHOD USING PRINTED CIRCUIT BOARD PROBE AND BY IMAGE ANALYSIS

    Article • PROCEEDINGS OF HYDRAULIC ENGINEERING, January 2007, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  69. APPARENT DISPERSIVITY OF PHYSICALLY-CHEMICALLY HETEROGENEOUS POROUS MEDIA

    Article • PROCEEDINGS OF HYDRAULIC ENGINEERING, January 2006, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  70. Saltwater intrusion in coastal aquifer ??? comparison between the CIP and MOC simulation technique

    Article • Environmental Modeling & Assessment, October 2005, Springer Science + Business Media

    Prof., Dr. Kei Nakagawa

  71. Observations and modelling of seawater intrusion for a small limestone island aquifer

    Article • Hydrological Processes, January 2005, Wiley

    Prof., Dr. Kei Nakagawa

  72. MOVEMENT OF RESIDUAL SALTWATER IN SUBSURFACE DAM TO PREVENT SALTWATER INTRUSION

    Article • PROCEEDINGS OF HYDRAULIC ENGINEERING, January 2004, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  73. MASS TRANSPORT IN THE UNSATURATED-HETEROGENEOUS POROUS MEDIA

    Article • PROCEEDINGS OF HYDRAULIC ENGINEERING, January 2003, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  74. EXPERIMENTAL STUDY ON THE HYDRO-CHEMICAL PROPERTY IN THE SOIL UNDER AN APPLIED ELECTRIC GRADIENT

    Article • PROCEEDINGS OF HYDRAULIC ENGINEERING, January 2003, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  75. STUDY ON THE MIXING OF FRESH AND SALT GROUNDWATER IN A SANDY BEACH USING PIPE DRAINES TO EXTEND THE UNSATURATED ZONE

    Article • PROCEEDINGS OF HYDRAULIC ENGINEERING, January 2002, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  76. Reactive Solute Transport Analysis using Global Optimization

    Article • Journal of Groundwater Hydrology, January 2002, Japanese Association of Groundwater Hydrology

    Prof., Dr. Kei Nakagawa

  77. NUMERICAL SIMULATION OF CHEMICAL TRANSPORT UNDER AN APPLIED ELECTRIC FIELD

    Article • PROCEEDINGS OF HYDRAULIC ENGINEERING, January 2001, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  78. Evaluation of the Heterogeneous Hydrogeological Structure

    Article • January 2000, Springer Science + Business Media

    Prof., Dr. Kei Nakagawa

  79. STUDY ON THE MICROSCOPIC AND MACROSCOPIC DISPERSIONS FOR THE TRACER TRANSPORT IN THE NON-UNIFORM POROUS MEDIA

    Article • PROCEEDINGS OF HYDRAULIC ENGINEERING, January 1998, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  80. Groundwater Flow and Mass Transport in A Non-uniform Porous Medium

    Article • Journal of Groundwater Hydrology, January 1998, Japanese Association of Groundwater Hydrology

    Prof., Dr. Kei Nakagawa

  81. Evaluation of the Transient Characteristics of Macroscopic Dispersion in the Non-uniform Field

    Article • Journal of Groundwater Hydrology, January 1998, Japanese Association of Groundwater Hydrology

    Prof., Dr. Kei Nakagawa

  82. The Feasibility Study for Development of Groundwater Resources by Subsurface Dam for Prevention of Salt Water Intrusion

    Article • PROCEEDINGS OF HYDRAULIC ENGINEERING, January 1996, Japan Society of Civil Engineers

    Prof., Dr. Kei Nakagawa

  83. SDS Polyacrylamide Gel Electrophoresis of Proteins

    Article • Springer Science + Business Media

    Prof., Dr. Kei Nakagawa