||Hydrology and Water Resources
Water not only serves as a vital substance for human existence but also plays an important role in advancing civilization. Since water is related to so many things in nature as well as in human society, the necessary knowledge is extremely broad and interdisciplinary. Hydrology deals with any topic related to water, especially the movement, distribution, and quality of water on Earth, including hydrologic cycle, water resources and environmental watershed sustainability. As hydrology is not an exact pure science, application of hydrologic knowledge to practical problems requires a great deal of rich experience and sound judgment of the hydrologist, a practitioner of hydrology.
Furthermore, many hydrologic systems and processes are highly complex, nonlinear, time-varying, and spatially distributed incorporating chaotic nature and randomness. With improved data acquisition and processing capabilities in the field, recently hydrologic sciences are supported by immense quantities of data. Now data-based approaches in hydrology and water resources have become very popular to take full advantage of information contained in such enormous data.
Other than any hydrologic topic, in this hydrology and water resources laboratory, we have been especially advancing urban hydrology, Asian water resources research, and data-based approaches.
In urban hydrology, at present, the urban landscape GIS (Geographic Information System) delineation data are developed and applied for urban flood and inundation problems, urban groundwater problems, urban evapotranspiration in the context of heat island phenomena, etc. We also focus on the research on “guerrilla rainstorm” (a localized downpour) using radar rain gage system like X-band MP-radar as well as newly developed urban rainfall runoff models including both lumped and distributed models.
As Asian water resources research, we have been deeply involved in groundwater problems specifically in Red River Delta, Vietnam from quantity, quality and sustainability viewpoints as well as flood and environmental problems in Metro Manila in Philippines as an example.
We apply a wide range of data-based methodologies for actual hydrologic and water resources problems, which includes not only standard statistical and stochastic methods, but also so-called “evolutionary computing” techniques, artificial neural networks, self-organizing maps, and so on.
The recent main research topics in this lab are as follows:
- Urban hydrologic model using urban landscape GIS delineation
- Storage function model considering urban runoff process
- Hydrologic cycle and water resources problems in Japan and overseas
- Relationship between global atmospheric-oceanic Indices and precipitation in Japan
- Water resources in developing countries
- Flood assessment management in developing countries
- Groundwater level fluctuation in Tokyo
Titles of master theses and doctoral dissertations
- *Basic study on spatio-temporal and runoff analysis of torrential rainfall in urban watershed using X-band MP radar
- *Basic study on sustainability assessment of groundwater resources in Hanoi, Vietnam
- Study on torrential rainfall characteristics contributing to the improvement of small and medium rivers in Tokyo
- Numerical solution and model parameter characteristics of Urban Storage Function model
- Study on reproducibility of virtual hydrograph by random forest method
- Study on the effect of pumping reduction in Musashino Plateau by groundwater simulation
- Construction and evaluation of sewer pipe network in Zenpukuji River watershed using road network
- Spatio-temporal characteristics and runoff analysis of heavy rain in urban small and medium river basins using X-band MP radar
- Study on hourly evapotranspiration model of urban basin using the landscape GIS and its application
- Study on safety degree against flood of small and medium rivers in Tokyo using water level flow curve by water surface gradient
- Study on block division for inundation analysis using 1/2500 digital map
- Construction of sewer pipe network from road polygon
- Study on storm runoff model considering roof rainwater drainage system for a small urban watershed in Sweden
- Parameter identification of urban storage function model using evolutionary computation method
- Groundwater flow simulation in Musashino plateau using GETFLOWS
*: Doctoral dissertation
Titles of bachelor theses
- Flood runoff and inundation risk assessment in the upper Kanda River watershed using NHRCM 5km rainfall data
- Social background of the Metropolitan Expressway taken over the Nihonbashi river
- Barrier analysis for integrated flood risk management in Metro Manila, Philippines using ISM method
- Genarating and characteristics of virtual hyetograph for small and medium sized rivers in Tokyo
- Sustainability assessment based on social assessment criteria for groundwater resources in Hanoi, Vietnam
- Evaluation of pumping control effect in Musashino plateau by groundwater flow simulation
- Study on river improvement considering the river environment in Shakujii River
- Field survey and evaluation of characteristics of landslide disasters in Tama area
- Analytical rainfall characteristics in Tokyo
- Environmental sustainability assessment of groundwater resources in Hanoi, Vietnam
- Groundwater flow simulation by GETFLOWS
- Spatio-temporal characteristics of heavy rianfall focusing on each observation in the Upper Kanda River watershed