英文業績のアブストラクト
Abstract of English Paper
- Chaves, P. and T. Kojiri :
Stochastic Fuzzy Neural Network Model: Deriving Optimal Stochastic Reservoir Operation Rules,
7th Inter. Conf. on Hydroinformatics HIC 2006, CD
Abstract: A new approach for system optimization, named stochastic fuzzy neural network (SFNN),
is proposed here. The SFNN may be defined as a neuro-fuzzy system that is stochastically
trained and can yield a quasi optimal solution. This method intends to overcome some of
the problems related to stochastic dynamic programming (SDP) models, such as the limitations
that may arise due to the backward-moving calculation scheme required by SDP models. For
validation, the proposed method is applied for the optimization of operating rules for a
reservoir in Brasil, considering stochastic representative inflows. After comparing the
results found here with the ones from other dynamic programming (DP) approaches for the
same problem, the SFNN model showed clearly improvements in the operation results.
- Junpei Nakatsuka, Tomoharu Hori, Toshiharu Kojiri and Teng-Sheng Chongan :
Modeling of the World Water Dynamics at Continental Scope with Water Resources Limitation,
J. Japan Soc. Hydrol. & Water Resour., Vol.20, No.1, 47-54, 2007
Abstract: This research addresses the problem of growing shortage of water resources
from the world-wide viewpoints by modeling of the socio-environmental changes. There
are two main objects; namely (i) to simulate and predict trends in the development of
human civilization in different continents taking into account the effects of limited
water resources through feedback links between water availability and the human actions,
and (ii) to identify the important roles and effects of water resources that have on
the growth of the world so as to aid in the planning of scenarios and policies for
sustainable development. A model exploring water needs in the various continents is
developed using System Dynamics. Identification of continents with acute water shortage
and development limitations will also be possible with this model.
- Kerkhoven, E., T.Y. Gan, M. Shiiba, G. Reuter, and K. Tanaka :
A comparison of cumulus parameterization schemes in a numerical weather prediction model
for a monsoon rainfall event, Hydrological Processes, Vol.20, No.9, pp.1961-1978, 2006.
- Takemon Y, Yamamoto A, Nakashima N, Tanida K, Kishi M & Kato M :
Isolation of sperm vesicles from adult male mayflies and other insects to prepare
high molecular weight genomic DNA samples, Molecular Biology Reports 33: pp.65-70, 2006.
アブストラクト(1ページpdfファイル)
- Anbutsu, K., Makajima, T., Takemon, Y., Tanida, K., Goto, N. and Mitamura,O. :
Distribution of biogeochemical compounds in interstitial and surface standing water
bodies in the gravel bar of the kizu River, Japan. Archiv fur Hydrobiologie 166, pp.145-167, 2006.
アブストラクト(1ページpdfファイル)
- Sakmoto, M., Y. Fukushima, Y. Hagihara :
Socio-Environmental Approach to Mitigation of Arsenic Contamination Disaster on
Drinking Water in Bangladesh, Pre-Conference Paper Volume ICWFM 2007, pp.11-18, 2007.
ABSTRACT:
Arsenic contamination of underground water has been a serious problem in
Bangladesh. Various alternative technologies were introduced to supply
safe drinking water. However, the technologies were not necessarily
accepted by local residents. Here, arsenic contamination of drinking
water is not thought to be resolved simply by tackling improvement of
arsenic removal technologies. It is important to recognize the arsenic
contamination problem as a disaster which is deeply related with local
social environment. Based on this point of view, mitigation planning of
arsenic contamination disaster on drinking water is presented in this
study. In particular as socio-environmental features, the models of
evaluating local peoples’ capability for getting safe water and stress
of carrying water are proposed.
- Sakai, A., K. Takahashi, T. Ahmed, Y. Hagihara, M. Sakamoto :
Issues on Safe Water Supply and Sanitation and Local People's Welfare in a
Rural Bangladesh, Pre-Conference Paper Volume ICWFM 2007, pp.537-544, 2007.
ABSTRACT :
Safe water supply and sanitation improvement is one of issues for
people’s safety and health in Bangladesh. The mitigation of
arsenic contamination of tube-wells is an urgent issue related
with health risks. As for sanitation, while the coverage of pit
latrine is increasing in these years, the pit latrine which has
been applied in Bangladesh has several disadvantages. In this paper,
based on the issues on water supply and sanitation in a rural
village, people’s welfare related with water supply and sanitation
is considered. The authors have implemented a questionnaire survey
on people’s worries over drinking water and sanitation and
willingness to improve their current situation. Although most of
the respondents are worrying over the drinking water, some of the
respondents who still drink arsenic contaminated water do not worry
over it and some of the pit latrine users who do not worry over
sanitation have not willingness to improve their situation.
- T.Hamaguchi, T.Kojiri and E.Nakakita:
New Approach to Distributed Parameter Identification in Groundwater Hydrology under
Geostatistics-generated Observations,3rd Int. Conf. on Hydrology and Water Resources
in Asia Pacific Region, 2006.
ABSTRACT: This paper proposes a numerical method that distributed parameters in
groundwater hydrology are uniquely and stably identified in an aquifer under
inadequate and ill-posed observations. The key to success in distributed parameter
identification is to additionally observe hydrological data in space or to get more
those data theoretically equivalent to observational data. To individually identify
the piecewise parameters with well accuracy, adequately quantitative and appropriately
qualitative observations in space should be conditioned. Based on geostatistics,
estimated data employed as observation in this paper are synthetically generated
from available information at some observed points. The geostatistical approach by
kriging estimation is conducted to estimate a spatial distribution subject to some
observations. The geostatistics-generated data to be kriged are observational
realizations interpolated/extrapolated over the observation network. Numerical
attempts with groundwater flow are figured out. It can be concluded that the proposed
method using geostatistics-generated observation is greatly successful and helpful
in parameter identification.
- Nasouhi, S., T. Hamaguchi, T. Kojiri:
Conjunctive Simulation of Surface and Subsurface Flow within Water Budget,
Proc of the 3rd APHW Conference on Wise Water Resources Management towards
Sustainable Growth and Poverty Reduction, ST1-01-A05-325, 2006 (CD-ROM).
- Tanaka, K., Y. Fujihara, T. Watanabe, T. Kojiri and S. Ikebuchi :
The Impact of Climate Change on the Surface Water Balance in Semi-arid Region,
Proc of the 3rd APHW Conference on Wise Water Resources Management towards
Sustainable Growth and Poverty Reduction, ST1-01-A07-433, 2006 (CD-ROM).
- Ito, Y., Q. Moteki, K. Souma, K. Yorozu, K. Tanaka, S. Ikebuchi :
Effects of Urban Heating on the Rainfall Event by a Cloud Resolving Model,
Proc of the 3rd APHW Conference on Wise Water Resources Management towards
Sustainable Growth and Poverty Reduction, ST1-05-A26-427, 2006 (CD-ROM).
- Yorozu, K., K. Tanaka, S. Ikebuchi : The Analysis of Inter-annual
Variability of Irrigation Water Requirement by Land Surface Model,
Proc of the 3rd APHW Conference on Wise Water Resources Management towards
Sustainable Growth and Poverty Reduction, ST1-05-A29-432, 2006 (CD-ROM).
- Yoshikawa, K., Y. Motonaga, A. Toda, M. Hayashi : On the Regeneration of
River Basin Zones and Urban Areas in Accord with Nature in the Tokyo Metropolitan Area
- A Study of river-based urban regeneration, focusing on the area around the Japanese capital -,
Proc of the 3rd APHW Conference on Wise Water Resources Management towards
Sustainable Growth and Poverty Reduction, 2006 (CD-ROM).
- Yoshikawa, K., Y. Motonaga : Waterfront Restoration of the Chao Phraya River –
On the Urban Embankment from the View of Water-Amenity -,
Proc of the 3rd APHW Conference on Wise Water Resources Management towards
Sustainable Growth and Poverty Reduction, 2006 (CD-ROM).
- Yoshikawa, K., Y. Motonaga : Post-Evaluative Study of Flood Damage Mitigation
Measures in the Basin of Gentle-Flowing Rivers on Low-Lying Plains,
Proc of the 3rd APHW Conference on Wise Water Resources Management towards
Sustainable Growth and Poverty Reduction, 2006 (CD-ROM).
- Kawaguchi, T., T. Kojiri : Development of Distributed Hydrological Model
Representing Relationship between Water Cycle and Human Activities for Whole River
Basin Environmental Assessment, 3rd Inter. Symp. on Integrated Water Resources
Management Reducing the Vulnerability of Societies Against Water Related Risks
at the Basin Scale, 2006.
- Takemon, Y. : Ecohydrological Roles of Debris-Flow and Flood in Stream
Ecosystemsand Challenges for Their Restoration, The 6th Japan-Taiwan Joint Seminar
on Natural Hazard Mitigation, Kyoto, Japan, 2006.
5ページpdfファイル
ABSTRACT: Historical evidences in sediment strata indicate frequent events of
flood and/or debris-flow in Japan. It means that most of the species in
biological communities have experienced such hazards repeatedly and ecosystems
have been maintained in relation to the catastrophic physical disturbance
at the hazards. In this paper, possible roles of flood and debris-flow in an
ecological context, such as habitat creation and maintenance by sedimentation
processes, reset of biological succession by disturbance, seal with toxic
material accumulated under undisturbed conditions, etc. are reviewed based on
some empirical data obtained in river and coastal ecosystems. Considering with
the state of human life owing to products of ecosystems, it could be concluded
that we had better associate with natural hazards not by prevention oriented
but by control or use oriented manner. This way of thinking is coherent with
the concept of “risk management” which emphasize as well as predicting
natural disasters efficiently enough for taking refuge before and after
the crises.
- Shimamura, T., Osaka K., Itoh, M.,Ohte, N. and Takemon, Y. : Spatial distribution
of nitrate in a Mizoro-ga-ike, a pond with floating mat bog, Proceedings of AOGS, 2007 (in press).
- Fujihara, Y., K. Tanaka, T. Nagano, T. Watanabe, T. Kojiri : Assessing the Impact
of Climate Change on the Water Resources of the Seyhan River Basin Turkey, International
Congress on River Basin Management, Vol.1, pp.453-463, 2007.
- Fujihara, Y., K. Tanaka, T. Watanabe, T. Kojiri : Potential Impacts of Climate
Change on the Hydrology and Water Resources of the Seyhan River Basin,
Proceedings of the International Symposium on Water and Land Management for
Sustainable Irrigated Agriculture, 2006(CD-ROM).
- Umetsu, C., K. Palanisami, Z. Coskun, S. Donma, T. Nagano, Y. Fujihara, K. Tanaka :
Climate Change and Alternative Cropping Patterns in Lower Seyhan Irrigation Project:
A Simulation Analysis, The 3rd International Groundwater Conference (IGC2007),
Water, Environment and Agriculture: Present Problems and Future Challenges, Coimbatore,
India, February 2007.
- Umetsu, C., K. Palanisami, Z. Coskun, S. Donma, T. Nagano, Y. Fujihara, K. Tanaka :
Climate Change and Alternative Cropping Patterns in Lower Seyhan Irrigation Project:
A Simulation Analysis, The Agricultural Economics Society of Japan Annual Meeting, Ginowan,
Japan, March 2007.
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