Department of Urban Engineering
School of Engineering, The University of Tokyo
Research works and supervision are conducted with Prof. Hanaki.
About all members, please visit the "Member" for Environmental Systems Lab.
It is expected that many excess land areas are produced by the falling birthrate and the aging population. Then, how can we utilize the areas?
One possible idea is installation of new energies. For example, how about installing solar energy panels there? We can reduce much GHGs! However,the city covered with solar panels may not be comfortable for people. It is expected that too artificial landscape can decrease the amenity. In our lab., we have tried to evaluate the relationships between GHGs reduction and peoplefs acceptance of new energies like solar panels and wind mills.
We show various figures consisted of greens and new energies as well as GHGs reduction potentials, and evaluate the peoplefs preferences through the questionnaire survey.
Universities are epitomes of future societies. To make a sustainable campus
can contribute to build-up sustainable society. From the concept, sustainable
campus projects are conducted in many USA universities like Yale. In UT,
we also promote the sustainable campus project, where faculties, staff,
and students are involved. Reducing GHGs from UT campus is one of research
topics in our lab.. You can find more detailed information at the TSCP (Todai Sustainable Campus Project) web site.
Production of bio-fuels like bio-ethanol and biodiesel has raised various controversies. There are doubts whether bio-fuel production can contribute to GHGs reduction when all life cycle processes like fertilizer production and electricity use are involved in the estimation of GHGs emission. The social effects such as competition with food production and land use change are also considered to be important aspects relating to bio-fuels. Our lab. has tried to estimate true CO2 reduction using LCA approach and evaluate social effects driven by bio-fuel production.
Recent target fields and materials: Brazil (sugar cane), India (jatropha), Indonesia (palm), Thailand (waterhyacinth)
"Biomass" has been intensively used because of its "Carbon Neutral" feature. It is believed that biomass use can achieve CO2 reduction, however, there still remains controversial aspects. For preventing the competition with food production and promoting the effective biomass use, the utilization of untapped biomass like organic wastes is preferable. At the same time, appropriate waste management in urban area should be considered.
We have dealt with rice husks in Viet Nam and water hyacinth in Thailand etc. Those organic materials derive water and air pollution in the regions. If we can show effective use of them, it can contribute not only to GHGs reduction but also to local environment improvement. We conduct LCA, cost evaluation and social surveys and evaluate the strategies.
To build-up more effective measures for encouraging citizens to behave environmentally, the current citizenfs state should be well comprehended. Some studies have evaluated the environmental burden of each behavior, but little attention has been given to the citizen itself as the performer of daily life. In this study, we extracted 44 everyday-behaviors and 13 machinery-introductions and a questionnaire to ask environmental consciousness, practice degrees of behaviors and the reasons, and the perceived effectiveness of those behaviors is conducted. Through the surveys, we try to reveal the relationships between the people's behaviors nad other factors like social conditions, psychological perceptions, socio-demographics, etc.B
In the case when lacking information is barrier of a behavior, giving information
can work effectively to foster the citizen's behavior. In this study, we
investigate what information can increase people's intentions on environmental
behaviors. Residents' perceptions of each information is investigated by
means of questionnaire survey. Finally, the effective information provision
ways are analyzed through the actual campaigns (Below picture is part of
our trial in the Seoul free-paper)
Measures of "Compact City"or new transportation facilities have posibility to reduce environmental loadings. However, in urban lives, we should consider not only environmental burdens but also quality of life (QOL).
We evaluate environmental loadings and people's objective and subjective satisfactions on various aspects of QOL.
Hat Yai area was strongly damaged by flood in 2000. They also had several big flood disasters besides it. Under future climate change, flood events can increase.
In this study, we predict future flood increase using GCM & downscaling and hydrological model. And taking into account land-use change and hard or soft infra installation, various measures for flooding are evaluated.
When we re-construct water systems, various aspects such as lifecycle and
local environmental impacts, cost, and impact on water cycle, should be
considered. Instead of integration of these aspects, we apply multi-objective
optimisation. Through the optimisation, we can get multiple optimized solutions
which can meet various people's preferences.
River fronts are important amenity spaces in urban areas. However, perceptions on rivers vary from person to person. For conductiong cost-benefit analysis, value and valuation structure of water-front must be revealed.
@We try to quantitatively evaluate the valuation structure using online questionnaire, conjoint analysis, structural equation modeling, latent class analysis, etc.
Castle moats are important urban water-fronts. However, many moats are
closed water bodies and the water quality is not so good. The moat of Edo
castle receives water only from rain and CSO (combined sewer outflow) and
the water quality is also bad(right photo shows severe algal bloom in summer).
In urban areas, reclaimed water can be one of the most stable water sources.
We evaluate the effects of introduction of reclaimed water on the water
quality of the moat and also evaluate the cost and people's impressions.
Many cases where big gap exists between the specialists and citizens have been observed. We pick up "Risk Communication" as typical communication between specialists and citizens, and investigate how to transfer the information of risk derived from microorganisms or chemicals. For reducing the gap between the specialists and citizens about risk perception of drinking water, appropriate risk communication has been thought to be necessary.
However, a question comes up: what is the appropriate communication like? Is it true that provision of information is enough for the communication? To know the effect of information on the citizenfs risk perception, we applied on-line questionnaire survey and evaluated the effects of provided information. The respondents were divided into various groups and the combination of provided information was changed for each group.The risk perception was asked using the scales proposed by Slovic (1987), where the extraction of two factors such as gdread factorh and gunknown factorh was expected. Besides, the questions for the risk acceptance and risk orientation were asked to analyze the respondentfs personality.