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Kazuaki Hiramatsu Last modified date:2021.05.27

Professor / Division of Bioproduction Environmental Sciences
Department of Agro-environmental Sciences
Faculty of Agriculture


Graduate School
Undergraduate School
Other Organization


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Homepage
https://kyushu-u.pure.elsevier.com/en/persons/kazuaki-hiramatsu
 Reseacher Profiling Tool Kyushu University Pure
http://www2.bpes.kyushu-u.ac.jp/~www-water/
Laboratory web page(in Japanese) .
http://www2.bpes.kyushu-u.ac.jp/~www-water/index-e.html
Laboratory web page(in English) .
Academic Degree
Doctor of Agriculture
Field of Specialization
Environmental Hydraulics, Environmental Hydrology
Outline Activities

I have engaged in the research concerning the dynamics of water and ecological environments with the key words "Sustainable development" and "Environmentally friendly".
(1) Mathematical modeling for water flow and movement of environmental materials in estuaries and closed water bodies
(2) Watershed management model for predicting occurrence, circulation and distribution of water and environmental materials
(3) Pesticide dynamics model in paddy and upland fields and its scaling-up to watershed model
(4) Eco-technology for biodiversity conservation in rural areas
(5) Quantification of flood mitigation function and prediction of flood runoff in flat low-lying agricultural areas

I am in charge of "Advanced Water Environment" in Master Course in Graduate School and "Water Environment" and "Drainage Engineering" in Undergraduate School. The "Water Environment", "Hydraulics" and "Hydrology" ranging from the basics to the large scale numerical analysis of water environment is lectured according to the syllabuses of Graduate School and Undergraduate School subjects that are in cooperation with each other.
Research
Research Interests
  • Mathematical modeling for water flow and movement of environmental materials in estuaries and closed water bodies
    keyword : Hydraulic model, Ecosystem model, Numerical simulation, DO, Nitrogen, Phosphorus
    2006.04Mathematical modeling for water flow and movement of environmental materials in estuaries and closed water bodies.
  • Hydraulic model, Ecosystem model, Numerical simulation, DO, Nitrogen, Phosphorus
    keyword : Hydrological model, Numerical simulation, GIS, Nitrogen, Phosphorus
    2006.04Watershed management model for predicting occurrence, circulation and distribution of water and environmental materials.
  • Hydrological model, Numerical simulation, GIS, Nitrogen, Phosphorus
    keyword : First order kinetics, Numerical simulation, GIS, environmental risk assessment
    2006.04Pesticide dynamics model in paddy and upland fields and its scaling-up to watershed model .
  • First order kinetics, Numerical simulation, GIS, environmental risk assessment
    keyword : Mathematical model, Fish preference, Agricultural canal
    2006.04Eco-technology for biodiversity conservation in rural areas.
  • Quantification of flood mitigation function and prediction of flood runoff in flat low-lying agricultural areas
    keyword : Hydrological model, Numerical simulation, Drainage and inundation analysis
    2006.04 Quantification of flood mitigation function and prediction of flood runoff in flat low-lying agricultural areas.
  • Study on Dynamic Structure of Water Environment in Closed Water Body from the Viewpoint of Environmental Hydraulics and Environmental Hydrology
    keyword : Dynamics of Water Environment, Ecological Environment of Water Area, Conservation of Water Environment. Prediction and Control
    1999.04~2006.03Study on Dynamic Structure of Water Environment in Closed Water Body from the Viewpoint of Environmental Hydraulics and Environmental Hydrology.
  • Relationship between Water Environment and Fish Behavior in Agricultural canal
    keyword : Japanese Medaka Fish, Ecological Environment in Water area, Conservation of Water Environment, Prediction and Control
    2000.04~2006.03Relationship between Water Environment and Fish Behavior in Agricultural canal.
  • Prediction of Water Environment using Artificial Intelligence Techniques
    keyword : Dynamics of Water Environment, Ecological Environment of Water Area, Conservation of Water Environment. Prediction and Control, Artificial Intelligence, Chaos Engineering
    1993.04~2006.03Prediction of Water Environment using Artificial Intelligence Techniques.
  • Convective-dispersion of Suspended Sediments in Open Channel Shear Flow
    keyword : Dynamics of Water Environment, Conservation of Water Environment. Prediction and Control, Laboratory Experiment, Field Observation, Numerical Simulation
    1994.04~2006.03Convective-dispersion of Suspended Sediments in Open Channel Shear Flow.
  • Transportation and Sedimentation of Suspended Bottom Mud in Semi-closed Bay
    keyword : Dynamics of Water Environment, Conservation of Water Environment. Prediction and Control, Laboratory Experiment, Field Observation, Numerical Simulation
    1988.04~2006.03Transportation and Sedimentation of Suspended Bottom Mud in Semi-closed Bay.
Current and Past Project
  • Development of Watershed Management Models Integrating Land-and-sea Areas in the Scarce-data Watersheds of South-east Asian Developing Countries
  • Water pollution and eutrophication are becoming manifest in Japan's closed water areas, such as agricultural reservoirs, lakes, and marshes, as well as in coastal, shallow water areas. This is due to the increased amount of industrial and residential water discharge that has arisen both from the growing use of agricultural chemicals and chemical fertilizers as well as from the progressive urbanization of Japan's agricultural regions since the 1970s. The problem is even more serious in the developing countries of Southeast Asia, where, according to our investigations in northern Vietnam, water pollution is spreading rapidly into agricultural and closed water areas. Due to a serious deterioration in the water environment, developing countries are on the verge of experiencing the same rapid water contamination in their agricultural areas as Japan experienced since the 1970s. Urgent measures are needed in these countries to protect water environments in downstream closed water areas and to reduce the contamination load discharged from land areas, while sustaining high agricultural productivity.

    Meanwhile, the environment of the watersheds is formed by material flow systems that reach closed, inner basins located anywhere between land areas upstream and downstream. Therefore, in order to protect the water quality in such regions, it is necessary to formulate an integrated management approach that comprehensively oversees the water and material recycling systems for watershed areas, including both land and sea.

    This project aims to develop integrated watershed environment management tools, tailored specifically to the Red River Watershed in the northern Vietnam and the Mekong River Watershed in the southern Vietnam, both of which are subject to serious water pollution. Another aim of this project is to form a center for research and education pertaining to watershed environments in collaboration with staff at the Hanoi and Ho Chi Minh City campuses of Water Resources University, which is under the administration of the Ministry of Agriculture and Rural Development.

    Research into watershed environment management encompasses a diverse range of areas, including upstream agricultural and forestry areas, middle- to downstream agricultural and industrial regions on the outskirts of urban areas, as well as closed water areas, rivers, irrigation and drainage canals, and coastal shallow water areas. Investigation into more extensive research tools for water, soil, meteorological, botanical, and other environments is also undertaken as part of watershed environment management. This project is conducted primarily by researchers in the Faculty of Agriculture at Kyushu University and the Institute of Tropical Agriculture at Kyushu University, with full support provided by the Research Institute for East Asia Environments at Kyushu University.
  • Development of Overall Watershed Environment Simulation Models and its Application to Integrated Watershed Management
  • Risk assessment of rice pesticides in the Chikugo river basin using a coupled water quality model
  • In this research, we have been aiming at the development of integrated water environment management models with the function of predicting and evaluating the watershed nutrient runoff loads of nitrogen and phosphorous from urbanizing agricultural watersheds in Asian monsoon region. The distributed-parameter models have been constructed by utilizing GIS techniques together with the detailed watershed information such as DEM, land utilization, river network and point sources. The prediction accuracy has been improved by innovating artificial intelligence techniques and time-frequency analyses when modeling sub-processes of nutrient runoff loads from various sources and water quality dynamics in closed water bodies, because it is generally difficult to quantify those sub-processes accurately.
    The model construction and validation have been conducted at two watersheds that have entirely different watershed characteristics, the Chikugo River watershed and the Zuibaiji River watershed. The Chikugo River watershed has a largest watershed area in Kyushu Island, Japan and a huge variety of land utilization in the watershed, while the Zuibaiji River watershed is located at the west of Fukuoka City, Japan and a typical urbanizing agricultural watershed with a relatively small watershed area. The models have been constructed and validated in the watersheds by quantifying each of sub-processes and connecting sub-models with each other.
  • Research Development on Effective Water Use Techniques for Sustainable Agriculture in Itoshima Area based on Ito Campus Branch of Faculty of Agriculture
  • Numerical modeling of preference intensity of river fish to environmental factors using artificial intelligence techniques
  • Research Partnership Building in Agricultural Field (Kyushu University's grant for faculties to promote research and education)
  • Flood Mitigation Function Estimate and Flood Prediction in a Flat Low-lying Agricultural Area
  • Estimation of Dynamic Properties of Water Environment and Modeling of Ecosystem in Semi-closed Reservoirs and Estuaries
  • Dynamic Properties of Wind-induced Flow and Water Quality in Semi-closed and Density-stratified Water Bodies Overgrown with Waterweeds
  • Quantitative Estimate of Water-energy-material Cycles and Public Functions of an Artificial Japanese Cypress Basin in Kyushu Island
Academic Activities
Papers
1. Ta Dang Thuan, Bui Quoc Lap, Le Minh Thanh, Masayoshi Harada, Kazuaki Hiramatsu and Toshinori Tabata, Ta Dang Thuan, Bui Quoc Lap, Le Minh Thanh, Masayoshi Harada, Kazuaki Hiramatsu and Toshinori Tabata, Journal of the Faculty of Agriculture, Kyushu University, https://doi.org/10.5109/4363557, 66, 1, 97-104, 2021.02, Many lakes in inner Hanoi have been affected by eutrophication, which commonly leads to uncontrolled growth of algae, generation of cyanobacteria and toxic algae, increased water–treatment costs, and lake shallowing. This study presents an overview of the recent eutrophication status in Hanoi lakes and compares the lakes with Cu Chinh Lake based on a case study performed from April 2017 to March 2018. The eutrophication was mainly assessed by comparing the nutritional parameters (phosphorus and nitrogen) with values of poor nutrition and the concentration of algal biomass with concentrations found in hypereutrophic lakes. In addition, we investigated which nutrients contribute to limiting the growth of algae based on the total nitrogen/total phosphorus ratio, and we identified groups of algae that contained typical species in Cu Chinh Lake. The nutrient levels and algal biomass in many lakes were maintained between the eutrophic and hypereutrophic limits and underwent seasonal changes throughout the year. In Cu Chinh Lake, phosphorus is the predominant limiting nutrient for the development of algae. Thus, some typical algae genera, such as Microcystis, Anabaena of cyanobacteria, and Scenedesmus of green algae, are biological indicators of eutrophication in the lake..
2. 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, https://doi.org/10.5109/4363555, 66, 1, 77-90, 2021.02, Hanoi, the capital of Vietnam, is protected from floods by dike systems for the Red and Day Rivers. In emergency situations resulting from catastrophic floods, floodwater from the Red River is discharged into the Van Coc Lake, which is a regulating reservoir that drains into the Day River system through the Day Weir at the downstream end of the Van Coc Lake. The authors investigated the flood mitigation function of the Van Coc Lake and identified an optimal operation scenario for the lake for the largest recorded flood, which occurred between the 16th and 27th of August 1971. However, a comprehensive evaluation of the flood risk level in residential areas within the floodplain areas located along the Day River system to determine an optimal operation scenario has not been conducted. In this study, a two–dimensional depth-integrated hydrodynamic model was employed to investigate flood risk levels in these residential areas when the floodwater level reached 11.0 m, 12.0 m, and 12.72 m (the flood peak) at the Day Weir and at 10 and 30 h after the flood peak, under the optimal operation scenario. The time at which floodwater from the Van Coc Lake reached the Day Weir was referred to as Time–0 in this study and was used to estimate the movement of floodwater. The study area, from the Day Weir to the downstream end, was more than 100 km in length and was divided into three zones: the northern part, designated Zone 1; the central part, designated Zone 2; and the downstream end part, designated Zone 3. The simulation results were used to produce reliable flood susceptibility maps that identify the areas at greatest risk of being impacted by floodwater. At the flood peak time, residential areas in the study area were inundated at levels of 84.00% (9.50 km2) in Zone 1, 71.84% (29.18 km2) in Zone 2, and 98.59% (13.31 km2) in Zone 3. Floodwater needed 75, 87, and 135 h from Time–0 to reach 11.0 m, 12.0 m, and the flood peak at 12.72 m at the Day Weir. The results of this study form a basis for future land planning and the design of risk reduction strategies for the Day River system and serve as a strong warning about the dangers of floodwater throughout the study area..
3. 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, https://doi.org/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..
Membership in Academic Society
  • The Japanese Society of Irrigation
  • The Japan Society of Hydrology and Water Resources
  • Research Institute of Signal Processing Japan
  • Japan Society of Water Environment
  • Japan Society of Civil Engineers
  • International Water Association
  • International Association of Hydrological Sciences
  • Drainage and Reclamation Engineering
  • Japanese Society of Irrigation, Drainage and Rural Engineering
  • Japanese Society of Hydrology and Water Resources
  • Japanese Society of Civil Engineers
  • Japanese Society on Water Environment
  • The Japanese Society of Fisheries Engineering
  • Ecology and Civil Engineering Society
  • The Oceanographic Society of Japan
  • Japan Rainwater Catchment Systems Association
  • International Water Association
  • International Association of Hydrological Sciences
  • The International Society of Paddy and Water Environment Engineering
Awards

  • Thuyloi University (TLU, formerly Hanoi Water Resources University) celebrated its 60th anniversary on 14th and 15th November 2019 with a ceremony that included many invited VIPs. During the ceremony, I was awarded the “Order of Merit” for my contributions to “education and training of Vietnamese students in the Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University” and “agriculture and rural development in Vietnam” by both the Minister of Education and Training and the Minister of Agriculture and Rural Development. Along with me, three other professors of overseas universities including the University of Brescia in Italy, Delft University of Technology in Netherlands and Tohoku University in Japan, also received the “Order of Merit” during the ceremony.
    The Faculty of Agriculture and the Institute of Tropical Agriculture, Kyushu University, have a long history of collaboration with TLU. We signed the first Agreements of Academic Cooperation and Student Exchange between the two universities in 2008. Since then, more than ten Vietnamese students from TLU have enrolled in our graduate school. In the years 2012 - 2014, we conducted a collaborative education and research project “Creation of Research Hub and Capability Building on Integrated Watershed Environment Management Tools in Southeast Asian Developing Countries” with the support of the JSPS Core-to-Core Program (Asia-Africa Science Platforms). During this project, many researchers from both universities made mutual visits and deepened bilateral exchange.
  • Kei Kondo, Julien Boulange,Thai Khanh Phong,Kazuaki Hiramatsu,Tsuyoshi Inoue and Hirozumi Watanabe: Probabilistic assessment of herbicide runoff from Japanese rice paddies: the effects of local meteorological conditions and site-specific water management, Journal of Pesticide Science, Vol.37, No.4, pp.312-322, 2012
    The paper has been selected as the best article among the articles from Vol.37, No.3 to Vol.38, No.2 appearing in Journal of Pesticide Science for excellence in the design, performance, and presentation of the research topics by the Editorial Board of Pesticide Science Society of Japan.
    Tadao Asami, President
    Tetsu Ando, Editor-in-Chief
Educational
Educational Activities

Water and Soil, Green in Itoshima


Science of Ecosystem, Drainage Engineering, Water Environmental Engineering, Exercise in Regional Environment, Seminar in Graduation Thesis


Bioproduction Environmental Sciences, Advanced Water Environment Analysis, Project-based exercise on Bioproduction Environmental Sciences, Advanced Research Training on Bioproduction Environmental Sciences 1, Advanced Research Training on Bioproduction Environmental Sciences 2


Advanced Experiment on Bioproduction Environmental Sciences, Exercise of Teaching, Exercise of Presentation, Internship, Exercise of Project, Advanced Research on Bioproduction Environmental Sciences, Advansed Seminar in Bioproduction Environmental Sciences
Other Educational Activities
  • 2019.11,
    Thuyloi University (TLU, formerly Hanoi Water Resources University) celebrated its 60th anniversary on 14th and 15th November 2019 with a ceremony that included many invited VIPs. During the ceremony, I was awarded the “Order of Merit” for my contributions to “education and training of Vietnamese students in the Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University” and “agriculture and rural development in Vietnam” by both the Minister of Education and Training and the Minister of Agriculture and Rural Development. Along with me, three other professors of overseas universities including the University of Brescia in Italy, Delft University of Technology in Netherlands and Tohoku University in Japan, also received the “Order of Merit” during the ceremony.
    The Faculty of Agriculture and the Institute of Tropical Agriculture, Kyushu University, have a long history of collaboration with TLU. We signed the first Agreements of Academic Cooperation and Student Exchange between the two universities in 2008. Since then, more than ten Vietnamese students from TLU have enrolled in our graduate school. In the years 2012 - 2014, we conducted a collaborative education and research project “Creation of Research Hub and Capability Building on Integrated Watershed Environment Management Tools in Southeast Asian Developing Countries” with the support of the JSPS Core-to-Core Program (Asia-Africa Science Platforms). During this project, many researchers from both universities made mutual visits and deepened bilateral exchange.
    .
  • 2015.03, Water pollution and eutrophication are becoming manifest in Japan's closed water areas, such as agricultural reservoirs, lakes, and marshes, as well as in coastal, shallow water areas. This is due to the increased amount of industrial and residential water discharge that has arisen both from the growing use of agricultural chemicals and chemical fertilizers as well as from the progressive urbanization of Japan's agricultural regions since the 1970s. The problem is even more serious in the developing countries of Southeast Asia, where, according to our investigations in northern Vietnam, water pollution is spreading rapidly into agricultural and closed water areas. Due to a serious deterioration in the water environment, developing countries are on the verge of experiencing the same rapid water contamination in their agricultural areas as Japan experienced since the 1970s. Urgent measures are needed in these countries to protect water environments in downstream closed water areas and to reduce the contamination load discharged from land areas, while sustaining high agricultural productivity.
    Meanwhile, the environment of the watersheds is formed by material flow systems that reach closed, inner basins located anywhere between land areas upstream and downstream. Therefore, in order to protect the water quality in such regions, it is necessary to formulate an integrated management approach that comprehensively oversees the water and material recycling systems for watershed areas, including both land and sea.

    This project aims to develop integrated watershed environment management tools, tailored specifically to the Red River Watershed in the northern Vietnam and the Mekong River Watershed in the southern Vietnam, both of which are subject to serious water pollution. Another aim of this project is to form a center for research and education pertaining to watershed environments in collaboration with staff at the Hanoi and Ho Chi Minh City campuses of Water Resources University, which is under the administration of the Ministry of Agriculture and Rural Development.
    Research into watershed environment management encompasses a diverse range of areas, including upstream agricultural and forestry areas, middle- to downstream agricultural and industrial regions on the outskirts of urban areas, as well as closed water areas, rivers, irrigation and drainage canals, and coastal shallow water areas. Investigation into more extensive research tools for water, soil, meteorological, botanical, and other environments is also undertaken as part of watershed environment management. This project is conducted primarily by researchers in the Faculty of Agriculture at Kyushu University and the Institute of Tropical Agriculture at Kyushu University, with full support provided by the Research Institute for East Asia Environments at Kyushu University..
  • 2008.07.
  • 2008.04.