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Hirayama Lab
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The lab designs systems that protect lives and the environment through water supply and waste management during disasters.
AboutAbout the lab
Preparing for disasters through engineering that protects life.
The Hirayama Lab researches technologies and methods for designing and managing societal systems that minimize the impact of disasters on human lives, health, and the environment.
In a disaster, damage to water and sewer systems, water quality risks, huge amounts of disaster waste, and the spread of hazardous substances occur at the same time, calling for environmental management different from that in normal times.
The lab pursues both "numerical analysis," using water network analysis software and geographic information systems, and "social implementation," putting the results to use in the field together with water utilities and local governments.
Key terms
- Disaster waste
- Large amounts of waste produced all at once by a disaster, such as debris from buildings and household goods broken by earthquakes or floods
- Social implementation
- Turning research results into a form that can be used in real society and in the field, so that they are put to practical use
- Temporary storage site
- A place where disaster waste is gathered and kept temporarily until it has been processed
NewsLab news
View More ↗ResearchResearch themes
From the perspectives of disasters and the environment, the lab develops technologies and systems for designing and managing social and environmental systems that minimize the impact of disasters on human lives, health, and the environment. It builds numerical simulation and statistical models, and it also works on how to implement the results in society, through industry-government-academia joint research with water utilities, local governments, the Los Angeles Department of Water and Power in the U.S., and others.
*Illustrative imageEstimating earthquake damage to water pipes
Focusing on each individual pipe that makes up a water network, the lab develops a method that uses probability to estimate where and how much damage an earthquake will cause. The relationship between shaking intensity and the likelihood of damage is applied to regional grid cells (meshes) to calculate the number of damage cases.
*Illustrative imageQuickly grasping the amount of disaster waste
Using widely available statistical data and disaster information obtained right after a disaster, the lab is building a system that can determine the amount of disaster waste at the initial response stage.
*Illustrative imageDesigning the disaster waste treatment flow
To consider securing temporary storage sites and collecting and transporting disaster waste together, the lab builds a model of the treatment flow that takes into account the area of storage sites and transport efficiency, and evaluates its relationship with the time required for treatment.
MembersFaculty
The members of the Hirayama Lab are faculty, administrative assistants, master's and undergraduate students, and commissioned researchers.As of 2026
- Associate ProfessorNagahisa Hirayama
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Water pipe repair, Ursynow” Wistula / CC BY-SA 4.0 (cropped)
- Estimating earthquake damage to water pipes: “7556Bulacan Bulk Water Supply Project water pipelines 14” Judgefloro / CC0 (cropped)
- Quickly grasping the amount of disaster waste: “Former waste disposal site in Mondercange 10” MMFE / CC BY-SA 4.0 (cropped)
- Designing the disaster waste treatment flow: “Waste collection trucks in the USA” Cathy from USA / CC BY-SA 2.0 (cropped)
- Related lab (Tomita-Nakamura (Shin)-Tashiro Lab (Land Design Lab)): “Santa Ana River, Lake Norconian, Prado Flood Control Basin” Dicklyon / CC BY-SA 4.0 (cropped)
- Related lab (Miyawaki Lab): “Lantana and South Palm Beach photo Don Ramey Logan” Don Ramey Logan / CC BY 4.0 (cropped)
- Related lab (Komatsu Lab (Komalab)): “Bremerton, WA public library interior” Joe Mabel / CC BY-SA 3.0 (cropped)
- Related lab (Design and Planning (Hotta) Lab): “Brasilia Congresso Nacional” Mario Roberto Duran Ortiz / Public domain (cropped)
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