Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Toshinori Tabata Last modified date:2023.11.27

Assistant Professor / Department of Agro-environmental Sciences / Faculty of Agriculture


Papers
1. Daoluang Honglikith, Masayoshi Harada, Kazuaki Hiramatsu, Toshinori Tabata and Akinori Ozaki, Anoxification Recovery Using Underwater LED Irradiation and Influence of its Optical Spectrum on Water Quality Improvement, https://doi.org/10.1007/s10333-021-00883-2, 20, 1, 153-175, 2022.01.
2. Ren Yamamoto, Masayoshi Harada, Kazuaki Hiramatsu and Toshinori Tabata, Three-layered Feedforward Artificial Neural Network with Dropout for Short-term Prediction of Class-differentiated Chl-a Based on Weekly Water-quality Observations in a Eutrophic Agricultural Reservoir, Paddy and Water Environment, https://doi.org/10.1007/s10333-021-00874-3, 20, 1, 61-78, 2022.01.
3. Sai Hong Anh, Toshinori Tabata, Kazuaki Hiramatsu, Masayoshi Harada, Flood Hazard Assessment of Residential Areas outside the Protected Area of the Red River Dike System in Hanoi, Vietnam, Japan Agricultural Research Quarterly, 10.6090/jarq.55.147, 55, 2, 147-160, 2021.04.
4. Akihiro Fukuda, Toshinori Tabata, Kazuaki Hiramatsu and Masayoshi Harada, Analysis of Salinity Behavior in Hakata Bay after Heavy Rainfall Using a Three-Dimensional  -Coordinate Model, Japan Agricultural Research Quarterly, 10.6090/jarq.55.137, 55, 2, 137-146, 2021.04.
5. Sai Hong Anh, Toshinori Tabata, Kazuaki Hiramatsu, Le Viet Son and Masayoshi Harada, Floodwater impacts on residential areas in floodplain areas along Day River system in emergency situation, Journal of the Faculty of Agriculture, Kyushu University, 66, 1, 77-90, 2021.04.
6. Ta Dang Thuan, Bui Quoc Lap, Le Minh Thanh, Masayoshi Harada, Kazuaki Hiramatsu and Toshinori Tabata, Eutrophication Status of Lakes in Inner Hanoi and a Case Study of Cu Chinh Lake, Journal of the Faculty of Agriculture, Kyushu University, 66, 1, 97-104, 2021.04.
7. Sai Hong Anh, Toshinori Tabata, Kazuaki Hiramatsu, Masayoshi Harada and Luong Ngoc Chung, An optimal scenario for the emergency solution to protect Hanoi Capital from the Red Riverfloodwater using Van Coc Lake, Journal of Flood Risk Management, 10.1111/jfr3.12661, 13, 4, 2020.12, The Red River dike system was built, and an emergency solution was implemented to protect Hanoi Capital city from flood disasters. In the solution, floodwater from the Red River is discharged through the Van Coc Gate, with an overflow point into Van Coc Lake, and is drained downstream through the Day Weir. However, an optimal scenario for the operating procedure of the emergency solution, based on a comprehensive evaluation of the flood risk level from the Red River to the residential areas located outside the protected areas of the dike system, has not been adequately addressed to date. In this study, we employed the latest digital elevation map in a high spatial resolution for the first time, and a two-dimensional depth-integrated hydrodynamic model was utilised to obtain the optimal operation for the emergency solution. The optimal scenario was determined to minimise the flood risk level to the residential areas and optimise the inflow discharge at the Van Coc Gate and the overflow point, and the outflow discharge at the Day Weir for ensuring the safety of the operating system. This study lays a promising foundation for designing risk-reduction strategies in Hanoi Capital..
8. Vu Thi Hoai Thu,Toshinori Tabata, Kazuaki Hiramatsu, Trieu Anh Ngoc and Masayoshi Harada, Assessing Impacts of Sea-Level Rise and Sea-Dike Construction on Salinity Regime in Can Gio Bay, South Vietnam, Journal of Waterway, Port, Coastal and Ocean Engineering, 10.1061/(ASCE)WW.1943-5460., 146, 6, 2020.11.
9. Sai Hong Anh, Toshinori Tabata, Kazuaki Hiramatsu, Masayoshi Harada and Le Viet Son, Flood Hazard Assessment of Residential Areas Inside the Van Coc Lake, Hanoi, in an Emergency Situation, Journal of the Faculty of Agriculture, Kyushu University, 65, 2, 305-311, 2020.09.
10. Makoto Fukui, Kazuaki Hiramatsu, Shinji Fukuda, Dario Pineda, Masayoshi Harada and Toshinori Tabata, Evaluation of Water-Saving Methodologies for Rice Farming Using a Distributed Long-Term Rainfall-Runoff Model Incorporated Agricultural Ponds Detected by Multi-Temporal SAR Images in the Ibague Watershed, Colombia, Journal of the Faculty of Agriculture, Kyushu University, 65, 2, 313-320, 2020.09.
11. Asari Takada, Kazuaki Hiramatsu, Ngoc Anh Trieu, Masayoshi Harada, and Toshinori Tabata, Evaluation of Impact of Climate Change and Rural Development on Rainfall-Runoff in a Southeast Asian Watershed by a Distributed Model Incorporated with Tank Models for Several Land Uses, Proceedings of 22nd Congress of International Association for Hydro-Environment Engineering and Research (IAHR), Asia Pacific Division (APD), 2020.09.
12. Mai Quoc Khanh, Kazuaki Hiramatsu, Toshinori Tabata, Masayoshi Harada, Numerical Simulations of Discharge Change Propagation in Open Channel Irrigation Systems, Journal of the Faculty of Agriculture, Kyushu University, 65, 1, 139-148, 2020.02.
13. Akihiro Fukuda, Toshinori Tabata, Kazuaki Hiramatsu and Masayoshi Harada, Salinity Analysis for Tracking the Behavior of Large Freshwater Discharge into Hakata Bay Due to Heavy Rainfall Using a Three-Dimensional σ-Coordinate Model, 2019.11.
14. Vu Thi Hoai Thu, Toshinori Tabata, Kazuaki Hiramatsu, Trieu Anh Ngoc, and Masayoshi Harada, Evaluation of Influence of River Inflow Discharge and Tidal Level to Spatial-temporal Distribution of Salinity in Can Gio Area, South of Vietnam by Two Series of Field Observations, 64, 2, 345-353, 2019.09.
15. Toshinori Tabata, Mitsuhiro Inoue, Kazuaki Hiramatsu and Masayoshi Harada, Hydraulic Analysis of Sediment Transportation in Yamada Weir Located in Chikugo River, Japan, 10.3850/38WC092019-1240, 2019.09.
16. Sai Hong Anh, Toshinori Tabata, Kazuaki Hiramatsu, Masayoshi Harada, Le Viet Son, Assessment of floodwater behavior in Van Coc Lake, Hanoi in event of emergency situation, Japan Agricultural Research Quarterly, 10.6090/jarq.53.181, 53, 3, 181-190, 2019.07, Van Coc Lake located in the Dan Phuong and Phuc Tho, Hanoi, Vietnam, has an area of 30.83 km2. It is usually dry and includes arable land and residential areas. However, to protect Hanoi City from catastrophic floods, in emergency situations, it receives the floodwater from the Red River as a regulating reservoir and drains the floodwater to the downstream Day River through the Day Weir. We performed numerical simulations to assess the movement of floodwater in this lake and evaluated the impact of floodwater on its residential areas. A two-dimensional depth-integrated hydrodynamic model was constructed to simulate inundation in this lake. The model was validated and the effects of Manning's coefficient of roughness were examined. In case of emergency, it has to receive an inflow of 2,500 m3/s into the area. Inflow rates of 1,200 and 600 m3/s were also examined to compare the results. The simulation results indicate that this lake was entirely inundated in 13, 28, and 56 h by inflow rates of 2,500, 1,200, and 600 m3/s, respectively. Between 66% and 99% of residential areas were inundated. The areas with highest velocity were primarily focused behind the gate with a velocity of 1.5-1.8 m/s..
17. Vu Thi Hoai Thu, Toshinori Tabata, Kazuaki Hiramatsu, Trieu Anh Ngoc, Harada Masayoshi, Impact of gate operating modes of sea dikes on hydrodynamic regime and inundated area in Can Gio Bay, Coastal Engineering Journal, 10.1080/21664250.2019.1579460, 61, 2, 171-186, 2019.05, Ho Chi Minh City gets severely inundated by upstream flooding and a combination of rising spring tides and rain, owing to the combined impacts of rapid urbanization and sea level changes. A sea dike to close Can Gio Bay has been proposed to regulate storage and control water levels in the drainage and sewer system of Ho Chi Minh City. However, this proposed sea dike and different gate operating modes could significantly change the hydrodynamic regime in Can Gio Bay. In this study, a two-dimensional hydrodynamic model was developed to assess changes in the hydrodynamic regime after construction of the sea dike, including fluctuations in the inundated areas in Can Gio Bay mangrove forests. The results show that sea dike construction is an effective solution for controlling water levels and reducing inundation, especially considering a sea level rise scenario in the year 2050. Further, the gate operation mode also affects the effectiveness of inundation reduction, which is approximately 10% better than the same sea dike type without gate operation. However, the sea dike was less effective in a sea water level rise scenario in 2100 for all scenarios..
18. Asari Takada, Kazuaki Hiramatsu, Ngoc Anh Trieu, Harada Masayoshi, Toshinori Tabata, Development of an optimizing method for the operation rule curves of a multipurpose reservoir in a Southeast Asian watershed, Paddy and Water Environment, 10.1007/s10333-019-00711-8, 2019.04, Water scarcity and flooding constitute major problems for developing countries located within the tropical climatic region of Southeast Asia. In addition, regional water consumption is increasing, and water usage patterns have been changing recently. Therefore, an advanced water resource management framework that considers both water supply and flood control is needed. Multipurpose reservoirs are widely used to manage water resources efficiently; however, water-related problems occur with reservoirs in Southeast Asian watersheds because of inadequate operation rule curves. We developed a method for constructing optimal operation rule curves for Dau Tieng Reservoir, which is one of the largest multipurpose reservoirs in Vietnam. The reservoir is used for flood control, domestic water supply, industrial uses, environmental flows, and agricultural uses, in the order of priority. The operation rule curves of the Dau Tieng Reservoir comprise five reference water levels: the retarding water level, upper water level, lower water level, critical water level, and dead water level. Water release from the reservoir is determined based on the relationship between the reservoir level and the rule curves. In this study, the rule curves were newly determined using the shuffled complex evolution method of the University of Arizona (SCE-UA method). The objective function for optimization was defined by focusing on the improvement in insufficient supply for agricultural uses and environmental flow downstream of the Dau Tieng Reservoir. Inadequate solutions were prevented by introducing penalty functions into the objective function. Experimental results indicate that the proposed optimization method efficiently searches for optimal rule curves..
19. Vu Thi Hoai Thu, Toshinori Tabata, Kazuaki Hiramatsu, Masayoshi Harada, Impact assessment of sea level rise and sea dike construction on Flood Inundation in Can Gio Bay, South of Vietnam, International Symposium on Agricultural, Food, Environmental and Life Sciences in Asia (AFELiSA 2017), 52, 2018.11, Ho Chi Minh City gets severely inundated by upstream flooding and a combination of rising spring tides and rain, owing to the combined impacts of rapid urbanization and sea level changes. A sea dike to close Can Gio Bay has been proposed to regulate storage and control water levels in the drainage and sewer system of Ho Chi Minh City. However, this proposed sea dike and different gate operating modes could significantly change the hydrodynamic regime in Can Gio Bay. In this study, a two-dimensional hydrodynamic model was developed to assess changes in the hydrodynamic regime after construction of the sea dike, including fluctuations in the inundated areas in Can Gio Bay mangrove forests. The results show that sea dike construction is an effective solution for controlling water levels and reducing inundation, especially considering a sea level rise scenario in the year 2050. Further, the gate operation mode also affects the effectiveness of inundation reduction, which is approximately
10% better than the same sea dike type without gate operation. However, the sea dike
was less effective in a sea water level rise scenario in 2100 for all scenarios..
20. Tran Tuan Thach, Harada Masayoshi, Kazuaki Hiramatsu, Toshinori Tabata, Estimation of water quality dynamics under long-term anoxic state in organically polluted reservoir by field observations and improved ecosystem model, Paddy and Water Environment, 10.1007/s10333-018-0659-6, 16, 4, 665-686, 2018.10, In closed water bodies with significant organic pollution, anoxification due to thermal stratification leads to the elution of nitrogen and phosphorus from the bottom sediment and the generation of sulfide, resulting in further degradation of the water environment. This study focuses on the water quality dynamics in an organically polluted reservoir exhibiting long-term anoxification using two approaches: (1) field observations of seasonal changes in vertical profiles of dissolved oxygen, nitrogen, phosphorus, and sulfide and (2) construction of a water quality prediction model based on an ecosystem model incorporated with anaerobic biochemical processes. Iron and sulfate reduction occurred simultaneously because nitrate–nitrogen was reduced by denitrifying bacteria after the anoxification, and iron reduction became the main factor of the increase in ammonium–nitrogen and phosphate–phosphorus. The redox state of the bottom sediment surface, when anoxification began to occur, greatly affected the water quality dynamics caused by gradual reductive reactions under anaerobic conditions. Furthermore, the calculation accuracy of ammonium–nitrogen, phosphate–phosphorus, and sulfide was highly improved by modifying the conventional model based on the field observations. The characteristics of water quality under anaerobic conditions were sufficiently reflected in the upgraded ecosystem model. The proposed water quality prediction model could be used to quantitatively estimate the water environment dynamics in organically polluted water bodies. The model could be developed further in the future to solve the problems caused by long-term anoxification..
21. Vu Thi Hoai Thu, Toshinori Tabata, Kazuaki Hiramatsu, Trieu Anh Ngoc, Harada Masayoshi, Effects of sea level rise and sea dike construction on the downstream end of the Saigon River Basin (Can Gio Bay), Japan Agricultural Research Quarterly, 10.6090/jarq.52.229, 52, 3, 229-239, 2018.01, Located at the downstream end of the Dong Nai-Saigon river basin, near the mouth of the Saigon River, which is known as the "green lungs" of Ho Chi Minh City (HCMC) due to the ecosystem functions of the Can Gio mangrove forest, is a very complex hydrodynamic and geomorphic region with crossing estuaries, forming the so-called Can Gio Bay. Given its flat, low-lying topography, this area is strongly influenced by two main factors: (1) upstream flooding and (2) tidal regimes. The historical flood event of 2000 indicated that the downstream region of HCMC suffers from serious flooding, and that the Can Gio area is the worst affected, with approximately 90% of its area being inundated. This research aims to investigate the impact of tides and inflows in Can Gio Bay in the context of sea level rise and a sea dike structure connecting Go Cong to Vung Tau. A two-dimensional hydrodynamic model combined with a wetting and drying scheme is used to determine the locations of inundated areas. This research also shows how sea level rise and upstream flows cause flooding in Can Gio Bay, and identifies the negative and positive impacts of sea dike construction on Can Gio Bay..
22. Tran Tuan Thach, Masayoshi Harada, Kazuaki Hiramatsu, Toshinori Tabata, Improvement of vertical one-dimensional prediction model of water quality based on ecosystem model in an organically polluted reservoir, International Symposium on Agricultural, Food, Environmental and Life Sciences in Asia (AFELiSA 2017), 51, 2017.11.
23. Tran Tuan Thach, Masayoshi Harada, Ayaka Oniki, Kazuaki Hiramatsu, Toshinori Tabata, Experimental Study on the Influence of Dissolved Or-ganic Matter and Redox State of Bottom Sediment on Water Quality Dynamics under Anaerobic Conditions due to Organic Pollution, Paddy and Water Environment, 10.1007/s10333-017-0600-4, 15(4), 889-906, 2017.10.
24. Toshinori Tabata, Wataru Hayashi, Emi Otsubo, Kazuaki Hiramatsu, Masayoshi Harada, Appropriate Water Quality Environment for Protecting the Coastal Ecosystem in the Ariake Sea, Japan, Proceedins of the 37th World Congress of the International Association for Hydro-Environment Engineering and Research (IAHR), No. 04-18-0765, 2017.08.
25. Akihiro Fukuda, Toshinori Tabata, Yuri Honda, Kazuaki Hiramatsu, Masayoshi Harada, Impact of Large Fresh Water Discharges into Hakata Bay Due to Torrential Rain Using Nested Two-Dimensional Convective-Dispersive Model, 10.4236/jwarp.2017.96036, 9, 553-565, 2017.05, In this study, numerical simulation of a two-dimensional convective-dispersive model in Hakata Bay, Japan, is performed to analyze the impact of major river discharges due to torrential rain in Fukuoka City. Tank models are applied to calculate river discharges, which are taken into consideration as river inflow in the hydrodynamic model of Hakata Bay. A two-way nesting “edge” technique is developed and applied in the model in order to consider the influence of narrow and complex geographical features. The area around “Island City” and Imazu Bay are calculated in high resolution. The resulting model has high reproducibility since the calculated river discharges, tidal current, and salinity show good agreement with observed data. To analyze the impact of large river discharges, the calculation period is set from 11 September 2002 to 21 September 2002 since there was torrential rain on September 16 in the given year in Fukuoka City (163.5 mm/d). The results show that low-salinity water covered the whole of the inner part of Hakata Bay, and water of lower salinity than outer sea water (
26. 高田 亜沙里, Trieu Anh Ngoc, 平松 和昭, 原田 昌佳, 田畑 俊範, Development of a Grid-based Distributed Runoff Model and Flood Scenario Analyses in Dau Tieng River Watershed, Vietnam, 雨水資源化システム学会, 22, 2, 9-17, 2017.01.
27. Toshinori Tabata, Kazuaki Hiramatsu, Harada Masayoshi, Numerical Analysis for Effective Transplant and Seabed Restoration for Recovery of Pen shell Resources in the Ariake Sea, Japan, 10.7763/IJESD.2015.V6.568, 6, 2, 93-99, 2015.02.
28. Toshinori Tabata, Kazuaki Hiramatsu, Harada Masayoshi, Assessment of the Water Quality in the Ariake Sea Using Principal Component Analysis, Journal of Water Resource and Protection, 10.4236/jwarp.2015.71003, 7, 41-49, 2015.01.
29. Toshinori Tabata, Kazuaki Hiramatsu, Harada Masayoshi, Hirose Michinobu, Numerical analysis of convective dispersion of pen shell Atrina pectinata larvae to support seabed restoration and resource recovery in the Ariake Sea, Japan, Ecological Engineering, 10.1016/j.ecoleng.2013.04.018, 57, 154-161, 2013.04.