教員イメージ
AZHIKODAN Gubash
助教

AZHIKODAN Gubash アジコダン グバッシュ あじこだん ぐばっしゅ

プロフィール

所属

東京都立大学都市環境学部 都市基盤環境学科
都市環境科学研究科 都市基盤環境学域

最終学歴・学位

PhD in Engineering (Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Japan)

専門・研究分野

Hydraulic Engineering, Estuarine hydro- and morphodynamics, Cohesive sediment transport, Phytoplankton dynamics

研究

研究テーマ

Hydrography, sediment transport and phytoplankton dynamics in Asian estuaries

Long term morphodynamic evolution in a macrotidal estuary

Recent Trends in Estuarine Hydro- and Morphodynamics in the Context of Climate Change

研究キーワード

Estuaries, Tides, Mixing Processes, Saltwater intrusion, Estuarine Turbidity Maximum, Sediment Transport, Hydrodynamics, Morphodynamics, Bathymetry, Phytoplankton

詳細情報

Publication Status: 37 Journal articles, 4 Book chapters, and 45 Conference proceedings

PEER REVIEWED INTERNATIONAL JOURNAL PAPERS

37. Priya, K.L., Azhikodan, G.*, Yokoyama, K., Renjith, K.R., 2025. Analysing the influence of hydrodynamic and sedimentary factors on the microplastic distribution in the Ashtamudi estuary, India. Marine Pollution Bulletin, 212, 117537, IF: 5.3, https://doi.org/10.1016/j.marpolbul.2025.117537

36. Phyu, P.E., Azhikodan, G.*, Yokoyama, K., 2025. Long-term (68 years) morphological changes of the alluvial river and macro-tidal estuary affected by river works and extreme rainfall disasters. Journal of Hydrology, 648, 132497, IF: 5.9, https://doi.org/10.1016/j.jhydrol.2024.132497

35. Hlaing, N.O., Azhikodan, G.*, Yokoyama, K., 2024. Effect of monsoonal rainfall and tides on salinity intrusion and mixing dynamics in a macrotidal estuary. Marine Environmental Research, 202, 106791, IF: 3.0, https://doi.org/10.1016/j.marenvres.2024.106791

34. Hlaing, N.O., Azhikodan, G.*, Yokoyama, K., 2024. Effect of topography and tidal variations on the flow dynamics in multi-channel tidal river estuaries. Estuarine, Coastal and Shelf Science, 308, 108923, IF: 2.6, https://doi.org/10.1016/j.ecss.2024.108923

33. Nwe, L.W., Azhikodan, G.*, Yokoyama, K., 2024. Effect of fortnightly and seasonal changes in estuarine physical variables on phytoplankton distribution in a macrotidal monsoon estuary. Continental Shelf Research, 279, 105292, IF: 2.1, https://doi.org/10.1016/j.csr.2024.105292

32. Kheiri, G., Pabalan, R., Duka, M.A., Azhikodan, G.*, Yokoyama, K., 2024. Factors contributing to the minimum water column stability and timing of the winter turnover in the Ogouchi reservoir. Journal of Environmental Management, 365, 121537, IF: 8.0, https://doi.org/10.1016/j.jenvman.2024.121537

31. Rawat, V.S., Fujikawa, R., Azhikodan, G.*, Yokoyama, K., 2024. Relationship between hydro-environmental variables and Coilia nasus catch in a highly turbid macrotidal estuary in Japan. Estuarine, Coastal and Shelf Science, 302, 108773. (IF: 2.8). https://doi.org/10.1016/j.ecss.2024.108773

30. Vidyalashmi, K., Nandana, J.S., Azhikodan, G.*, et al., 2024. Analysing the performance of the NARX model for forecasting the water level in the Chikugo River estuary, Japan. Environmental Research, 251, 118531. (IF: 8.3). https://doi.org/10.1016/j.envres.2024.118531

29. Phyu, P.E., Azhikodan, G.*, Yokoyama, K., 2024. Effects of past human activities and recent disasters on riverbed morphology of the Chikugo River estuary, Journal of Japan Society of Civil Engineers, 12, 2, 23-16019. https://doi.org/10.2208/journalofjsce.23-16019

28. Hlaing, N.O., Azhikodan, G.*, Yokoyama, K., 2024. Topography and tidal variations: impact on counter-current flow at the confluence area of Tanintharyi River estuary, Journal of Japan Society of Civil Engineers, 12, 2, 23-16140. https://doi.org/10.2208/journalofjsce.23-16140

27. Nwe, L. W., Yokoyama, K., Azhikodan, G.*, 2022. Phytoplankton habitats and size distribution during a neap-spring transition in the highly turbid macrotidal Chikugo River estuary. Science of The Total Environment, 850, 157810. (IF: 9.8). https://doi.org/10.1016/j.scitotenv.2022.157810

26. Hlaing, N.O., Azhikodan, G., Yokoyama, K., 2022. Seasonal and Tidal Variations of Estuarine Turbidity Maximum (etm) at Tanintharyi River Estuary. Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 78(2), 1123-1128. https://doi.org/10.2208/jscejhe.78.2_I_1123

25. Nwe, L.W., Azhikodan, G., Yokoyama, K., 2022. Changes in Size Distribution of Phytoplankton in Response to Tidal Variability in the Chikugo River Estuary. Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 78(2), 1069-1074. https://doi.org/10.2208/jscejhe.78.2_I_1069

24. Azhikodan, G., Hlaing, N. O., Yokoyama, K., Kodama, M., 2021. Spatio-temporal variability of the salinity intrusion, mixing, and estuarine turbidity maximum in a tide-dominated tropical monsoon estuary. Continental Shelf Research 225, 104477. (IF: 2.3). https://doi.org/10.1016/j.csr.2021.104477

23. Somsook, K., Azhikodan, G., Duka, M. A., Yokoyama, K., 2021. Riverbed fluctuation and erosion property of cohesive sediment based on long-term topographic surveys in a macrotidal estuary. Regional Studies in Marine Science 45, 101848. (IF: 2.1). https://doi.org/10.1016/j.rsma.2021.101848

22. Azhikodan, G., Yokoyama, K., 2021. Erosion and Sedimentation Pattern of Fine Sediments and Its Physical Characteristics in a Macrotidal Estuary. Science of the Total Environment 753, 142025. (IF: 9.8). https://doi.org/10.1016/j.scitotenv.2020.142025

21. Nwe, L.W., Azhikodan, G., Yokoyama, K., Kodama, M., 2021. Spatio-temporal distribution of diatoms and dinoflagellates in the macrotidal Tanintharyi River estuary, Myanmar. Regional Studies in Marine Science, 101634. (IF: 2.1). https://doi.org/10.1016/j.rsma.2021.101634

20. Casila, J. C., Azhikodan, G., Yokoyama, K., 2020. Quantifying water quality and flow in multi-branched urban estuaries for a rainfall event with mass balance method. Water Science and Engineering 13(4), 317-328. (IF: 4.0). https://doi.org/10.1016/j.wse.2020.12.002

19. Padiyedath, S.G., Kawamura, A., Amaguchi, H., Azhikodan, G., 2020. A Generalized Storage Function Model for the Water Level Estimation using Rating Curve Relationship. Water Resources Management 34, 2603-2619. (IF: 4.3). https://doi.org/10.1007/s11269-020-02585-6

18. Azhikodan, G., Yokoyama, K., 2019. Seasonal Morphodynamic Evolution in a Meandering Channel of a Macrotidal Estuary. Science of the Total Environment 684, 281–295. (IF: 9.8). https://doi.org/10.1016/j.scitotenv.2019.05.289

17. Veerapaga, N., Azhikodan, G., Shintani, T., Iwamoto, N., Yokoyama, K., 2019. A Three-Dimensional Environmental Hydrodynamic Model, Fantom-Refined: Validation and Application for Saltwater Intrusion in a Meso-Macrotidal Estuary. Ocean Modelling 141, 101425. (IF: 3.2). https://doi.org/10.1016/j.ocemod.2019.101425

16. Padiyedath, S.G., Kawamura, A., Amaguchi, H., Takasaki, T., Azhikodan, G., 2019. A bootstrap approach for the parameter uncertainty of an urban-specific rainfall-runoff model. Journal of Hydrology 579, 124195. (IF: 6.4). https://doi.org/10.1016/j.jhydrol.2019.124195

15. Veerapaga, N., Azhikodan, G., Shintani, T., Yokoyama, K., 2019. Numerical study on effect of topography, shape, and multi-branch on saltwater intrusion in a conceptual estuary. Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), 19–24. https://doi.org/10.2208/kaigan.75.I_19

14. Padiyedath, S.G., Kawamura, A., Amaguchi, H., Azhikodan, G., 2019. A generalized urban storage function model considering spatial rainfall distribution. Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 75(2), 223–228. https://doi.org/10.2208/jscejhe.75.2_I_223

13. Padiyedath, S.G., Kawamura, A., Amaguchi, H., Azhikodan, G., Takashi Suzuki., 2019. Storm Runoff Analysis by Generalised Storage Function Model. Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 75(5), 99–105. https://doi.org/10.2208/jscejer.75.I_99

12. Azhikodan, G., Yokoyama, K., 2018. Sediment transport and fluid mud layer formation in the macro-tidal Chikugo River Estuary during a fortnightly tidal cycle, Estuarine Coastal and Shelf Science 202, 232–245. (IF: 2.8). https://doi.org/10.1016/j.ecss.2018.01.002

11. Padiyedath, S. G., Kawamura, A., Takasaki, T., Amaguchi, H., Azhikodan, G., 2018. An effective storage function model for an urban watershed in terms of hydrograph reproducibility and Akaike information criterion. Journal of Hydrology 563, 657–668. (IF: 6.4). https://doi.org/10.1016/j.jhydrol.2018.06.035

10. Padiyedath, S. G., Kawamura, A., Amaguchi, H., Azhikodan, G., 2018. Parameter uncertainty analysis of a storage function model using bootstrap method for an urban watershed, Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(5), 151¬–156. https://doi.org/10.2208/jscejhe.74.5_I_151

9. Padiyedath, S. G., Kawamura, A., Amaguchi, H., Azhikodan, G., 2018. Effect of lag time in Kimura’s storage function model on hydrograph reproducibility for an urban watershed compared with Prasad’s model. Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 74(5), 69–77. https://doi.org/10.2208/jscejer.74.I_69

8. Veerapaga, N., Shintani, T., Azhikodan, G., Yokoyama, K., 2018. Numerical investigation on effects of discharge, tidal flux and bathymetry of estuary on type and length of salinity intrusion. Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(4), 781–786. https://doi.org/10.2208/jscejhe.74.I_781

7. Padiyedath, S. G., Kawamura, A., Takasaki, T., Amaguchi, H., Azhikodan, G., 2018. Performance evaluation of urban storage function (USF) model compared with various conventional storage function models for an urban watershed. Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(4), 973–978. https://doi.org/10.2208/jscejhe.74.I_973

6. Casila, J. C., Azhikodan, G., Yokoyama, K., Fukushima, K., Terajima, R., 2017. Effect of rainfall on saltwater and suspended sediment dynamics in multi-branched urban tidal estuaries. Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 73(5), 347 – 352. https://doi.org/10.2208/jscejer.73.I_347

5. Padiyedath, S. G., Kawamura, A., Amaguchi, H., Azhikodan, G., 2017. Baseflow estimation for tropical wet and dry climate regions using recursive digital filters. Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 73(5), 9 – 16. https://doi.org/10.2208/jscejer.73.I_9

4. Azhikodan, G., Yokoyama, K., 2016. Spatio-temporal variability of phytoplankton (Chlorophyll-a) in relation to salinity, suspended sediment concentration, and light intensity in a macrotidal estuary. Continental Shelf Research 126, 15–26. (IF: 2.3). https://doi.org/10.1016/j.csr.2016.07.006

3. Azhikodan, G., Yokoyama, K., 2015. Temporal and spatial variation of mixing and movement of suspended sediment in the macrotidal Chikugo River Estuary. Journal of Coastal Research 31, 680–689. (IF: 1.1). https://doi.org/10.2112/JCOASTRES-D-14-00097.1

2. Azhikodan, G., Yokoyama, K., 2014. Estuarine mixing and spatial distribution of phytoplankton in the Chikugo River Estuary. Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 70(2), 1081–1085. https://doi.org/10.2208/kaigan.70.I_1081

1. Azhikodan, G., Yokoyama, K., Morimura, Y., 2014. Effect of mixing on turbidity maximum movement during semilunar tidal cycle in the Chikugo River Estuary. Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 70(4), 37–42. https://doi.org/10.2208/jscejhe.70.I_37


PEER REVIEWED BOOK CHAPTERS

2. Azhikodan, G., Somsook, K., Yokoyama, K., 2020. Seasonal Morphodynamics and Sediment Transport in a Highly Turbid Meandering Estuarine Channel. In: Nguyen K., Guillou S., Gourbesville P., Thiébot J. (eds) Estuaries and Coastal Zones in Times of Global Change. Springer Water. Springer, Singapore. 321-342. https://doi.org/10.1007/978-981-15-2081-5_19

1. Veerapaga, N., Shintani, T., Azhikodan, G., Yokoyama, K., 2020. Study on Salinity Intrusion and Mixing Types in a Conceptual Estuary Using 3-D Hydrodynamic Simulation: Effects of Length, Width, Depth, and Bathymetry. In: Nguyen K., Guillou S., Gourbesville P., Thiébot J. (eds) Estuaries and Coastal Zones in Times of Global Change. Springer Water. Springer, Singapore. 13-30. https://doi.org/10.1007/978-981-15-2081-5_19
“Best International Paper Award" in the Annual conference on Hydraulic Engineering 2022, Japan Society of Civil Engineers (JSCE).
Hlaing, N. O., Azhikodan, G., Yokoyama, K., 2022. Seasonal and Tidal Variations of Estuarine Turbidity Maximum (ETM) at Tanintharyi River Estuary. Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 78(2), I_1123-I_1128.
Member of JSCE; EGU; AOGS; IAHR; ECSA.

Main convener of the session “OS20 - Estuarine Hydrodynamics and Morphodynamics - Laboratory Experiments, Field Observations, Remote Sensing, and Numerical Modelling”, AOGS 2024.

Main convener of the session “OS20 - Recent Trends in Estuarine Hydro- and Morphodynamics in the Context of Climate Change”, AOGS 2022.

Co-convener of the session “Estuarine contaminant dynamics – Assessing the impact of human interventions”, CERF 2021.

Peer reviewer of,

Elsevier - Science of the Total Environment; Estuarine, Coastal and Shelf Science; Continental Shelf Research; International Journal of Sediment Research; Regional Studies in Marine Science
Wiley - Earths Future
ASCE - Journal of Hydraulic Engineering
Springer - Arabian Journal of Geosciences; Ocean Science Journal; Sustainable Water Resources Management
MDPI - Water; Journal of Marine Science and Engineering; Fluids
PLOS - PLOS ONE
Organizing online/offline internship in the field of "Hydrodynamic Studies on Estuaries" since 2021 for the undergraduate students (27) from TKM College of Engineering, Kollam, Kerala, India.

Inaugurated and presented the keynote address entitled “Scope of higher studies in agricultural and water resources engineering in TMU and Japan” in the international conference on innovative agricultural engineering and food technology during 28 and 29 December 2021.
  • 環境水理学特論I
  • 環境水理学特論II
  • 組織再編前旧課程の同時開講科目等が含まれており、掲載されている全ての科目を開講するわけではありません。

連絡先

研究室

Building 9, Room No. 669

内線番号

内線4576

メールアドレス

gubash●tmu.ac.jp
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