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Ikeda, Makoto; Munakata, Masahiro; Sakai, Ryutaro; Fuchiwaki, Hirotaka; Kimura, Hideo; Matsuba, Hisashi*
Nihon Chikasui Gakkai 2010-Nen Shuki Koenkai Koen Yoshi, p.282 - 287, 2010/11
no abstracts in English
Munakata, Masahiro; Sakai, Ryutaro; Namekawa, Maki; Fuchiwaki, Hirotaka
Proceedings of International Waste Management Symposia 2010 (WM 2010) (Internet), 8 Pages, 2010/03
Japan Atomic Energy Agency has started to investigate a regional groundwater flow system of sedimentary rock in an area in Boso Peninsula of Japan, where the topographic and geological features are relatively simple for mathematical modeling and hydraulic data are available. Groundwater flow on a horizontal 50 km scale is analyzed by using numerical code taking into account climate change. The analytical results for current (today's) steady conditions show that the groundwater flow is mainly from south-eastern area to north-western area in the direction of dip in the stratum. With, precipitation and topographic changes caused by climate change in 80,000 years, future conditions are estimated from existing and observed data. The analyzed results of groundwater flow in future steady conditions show that travel velocities change within a range of 10%. It is indicate that variance of groundwater flow caused by climate changes will be small in this study.
Fuchiwaki, Hirotaka; Matsuba, Hisashi; Munakata, Masahiro
no journal, ,
This study was conducted to develop methodologies of regional scale to be assessed for long-term groundwater flow systems. Through the GIS techniques, this study is being advanced. As the application case, at crystalline rock distribution area 3 examples and sedimentary rock distribution area 1 example, this study was executed respectively. In regard to latter 1 example, concerning the analytical object range when future topographical sea level change is considered it examined. As a result, concerning the analytical range for the underground water flow analysis presently for topography, what can set the analytical territory in the rational range making use of the GIS analytical result was found. In addition, it was found that supposition of the time scale is important concerning the analytical range which considers future topographical change and sea level change.
Munakata, Masahiro; Fuchiwaki, Hirotaka; Sakai, Ryutaro; Hanatani, Ikuo; Kimura, Hideo
no journal, ,
A long-term groundwater flow for reginal area of sedimentary rock was studied in order to develop the safety assessment code for groundwater flow. The area (40
50 km) consists of sandstone and mudstone with the monoclinal structure of their layers. The hydraulic data of the stratum was used from existing surveys and literatures. In addition, taking account of the geomorphic changes in long-term evaluation, uplift and erosion data in this area was adopted in the analysis. Analytical results show that the groundwater flow velocity after 100,000 years is increased by 5% in the 500 m depth of the center of the domain because of increasing hydraulic gradient caused by the geomorphic changes.
Kimura, Hideo; Munakata, Masahiro; Hanatani, Ikuo; Sakai, Ryutaro; Fuchiwaki, Hirotaka; Matsuba, Hisashi
no journal, ,
no abstracts in English
Fuchiwaki, Hirotaka; Munakata, Masahiro; Kimura, Hideo; Imai, Hisashi*; Shiozaki, Isao*; Yamashita, Ryo*
no journal, ,
It is thought that in an external factor that influences the underground flow, there is a climatic variation repeated at the cycle of the order of 100,000 years, the following phenomena are caused by this climatic variation, and it influences the underground flow. It is thought that the following phenomena are caused by this climatic variation, and it influences the underground flow. (1) Development and disappearance of glacier, (2) Change in precipitation, (3) Decrease in amount of training because of development of frozen soil, (4) Sea-level rhythms, (5) Upheaval and erosion by gaining the weight to the earth's crust according to development of river and disappearance, (6) Dilution of seawater according to glacier disappearance, etc. The analytical result and the evaluation are announced.
Munakata, Masahiro; Kimura, Hideo; Sakai, Ryutaro; Namekawa, Maki; Fuchiwaki, Hirotaka
no journal, ,
no abstracts in English
Namekawa, Maki; Munakata, Masahiro; Fuchiwaki, Hirotaka; Kimura, Hideo
no journal, ,
no abstracts in English
Fuchiwaki, Hirotaka; Namekawa, Maki; Munakata, Masahiro; Kimura, Hideo
no journal, ,
no abstracts in English
