Department of Energy Management (DEM)
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Tokuyama Dam
Tokuyama Dam --The Largest Rockfill Dam in Japan Creating a Beautiful Reservoir in Harmony with Nature -- Commissioned by: the Japan Water Agency 28 Tokuyama Dam Diversion tunnel No.1 L=1,474m Diversion tunnel No.2 L=1,135m Elevator Upstream Selective intake facility Downstream side side Top of dam Power Station Spillway g Buildin stration Admini National Highway No.417 Figure 1. Plan EL.(m) Upstream side Downstream side Normal Water Level EL.400.0m Elevation of Crest EL.406.0m 161.0m Rock Core Rock Filter Filter Gallery Blanket grouting Curtain grouting Figure 2. Cross Section EL.(m) EL.(m) Left bank Right bank Length of Crest 427.1m Elevation of Crest EL.406.0m Spillway Low Water Level EL.363.5m Diversion tunnel No.2 Diversion tunnel No.1 Figure 3. Longitudinal Section of Dam Axis 28 Tokuyama Dam Table 1. SPECIFICATIONS ITEM SPECIFICATIONS Purpose(s) Flood control, Nonspecific use/ecological discharge, Water supply, Irrigation, Power generation Location Chubu Region (Ibigawa town, Ibi-gun, Gifu Pref.) River Ibi River, Kiso River System Catchment Area 254.5 k m2 Completed 2008 Total Storage Capacity 660,000,000 m3 Reservoir Effective Storage Capacity 380,400,000 m3 Reservoir Area Approx. 13 km2 Type Central Core Type Rockfill Dam Height 161 m Dam Length of Crest 427.1 m Volume Approx. 13,700,000 m3 Orifice Radial Gates Crest Spillway W 4.1m × H 4.1m × 2 Gates Spillway Emergency Spillway Radial Gates Overflow W13.4 m × H10.95 m × 4 Gates Design Flood 4,200 m3/s Water Discharge Main Gate: Jet Flow Gate, φ 1,900 mm System for Water discharge Gates Auxiliary Gate: High Pressure Slide Gate, φ 2,150 mm Utilization Straight Multi-step Gate Intake Equipment Water Intake Gate W 11.0 m × H 45.5 m × 5 Steps-shutters Dam Body Kumagai Gumi Co.,Ltd, Taisei Corp., Asunaro Aoki Primary Firms Construction Co.,Ltd. -
History of Flood Fighting in the Kisosansen River Basin
Flood Recovery, Innovation and Response I 123 History of flood fighting in the Kisosansen River Basin Y. Takeuchi1, M. Takezawa2 & H. Gotoh2 1Japan Infrastructure Partners, Japan 2Civil Engineering of Science & Tech., Nihon University, Japan Abstract The Isewan Typhoon caused considerable damage to the downstream regions of the Kisosansen River Basin on 26th September 1959. It caused approximately 4,500 deaths in and around Nagoya City, the most industrial city in Japan. This study describes the history surrounding the major flood mitigation projects related to land use in the Kisosansen River Basin since 100 A.D. when paddy fields were first established on the alluvial plain. Land use of the area gradually evolved to cover the entire alluvial plain, developing from subsistence farming to modern sophisticated industry. This study shows that economic development in the both side plains of the river has been altered since the construction of the eastern side dike on the Kiso River. The Kisosansen River Basin, with a catchment area of 9,100 km2, is drained by the Kiso River, the Nagara River and the Ibi River. These rivers previously flew in the Nobi Plain as a single river, with successive floods producing a change in the main channel. Keywords: Isewan Typhoon, Kisosansen River, history of flood mitigation works, benefits associated with flood mitigation works. 1 Introduction While flood damage has always been associated with agriculture and human settlement, they have increased in size and frequency as land use has changed for settlement, agriculture, commerce and industry. The Isewan Typhoon affected the downstream regions of the Kisosansen River Basin on September 26, 1959. -
Dams in Japan Overview 2018
Dams in Japan Overview 2018 Tokuyama Dam JAPAN COMMISSION ON LARGE DAMS CONTENTS Japan Commission on Large Dams History … …………………………………………………………………… 1 Operation … ………………………………………………………………… 1 Organization… ……………………………………………………………… 1 Membership… ……………………………………………………………… 1 Publication…………………………………………………………………… 2 Annual lecture meeting… …………………………………………………… 2 Contribution to ICOLD… …………………………………………………… 2 Dams in Japan Development of dams … …………………………………………………… 3 Major dams in Japan… ……………………………………………………… 4 Hydroelectric power plants in Japan… ……………………………………… 5 Dams completed in 2014 − 2016 in Japan … ……………………………… 6 Isawa Dam… ……………………………………………………………… 7 Kyogoku Dam … ………………………………………………………… 9 Kin Dam…………………………………………………………………… 11 Yubari-Shuparo Dam… …………………………………………………… 13 Tokunoshima Dam………………………………………………………… 15 Tsugaru Dam… …………………………………………………………… 17 Introduction to Dam Technologies in Japan Trapezoidal CSG dam … …………………………………………………… 19 Sediment bypass tunnel (SBT)… …………………………………………… 19 Preservation measures of dam reservoirs… ………………………………… 19 Advancement of flood control operation… ………………………………… 20 Dam Upgrading Vision… …………………………………………………… 21 Utilization of ICT in construction of dam… ………………………………… 22 Papers in ICOLD & Other Technical Publications Theme 1 Safety supervision and rehabilitation of existing dams…………… 23 Theme 2 New construction technology … ………………………………… 26 Theme 3 Flood, spillway and outlet works… ……………………………… 29 Theme 4 Earthquakes and dams… ………………………………………… 30 Theme 5 Reservoir sedimentation and sustainable development…………… -
Dams in Japan.Indd
Dams in Japan Overview 2015 Tokuyama Dam JAPAN COMMISSION ON LARGE DAMS 1 DAMS IN JAPAN - OVERVIEW 2015 Japan Commission on Large Dams History Membership In 1931, three years after the International Commission on The members of JCOLD are incorporated bodies involved Large Dams (ICOLD) was established, Japan joined in dam construction. They include government bodies ICOLD as the Japan National Committee on Large Dams. concerned with dam construction, electric power companies, In 1944, Japan withdrew from ICOLD during the World survey and research bodies, academic associations, War II, then rejoined in March 1953. On September 13, industrial associations, construction consultants, 1962, the Japan Commission on Large Dams was construction companies, and manufacturers (75 members as established, and in January 2012, it became a General of January 2015). Incorporated Association. Operation JCOLD is involved in operations such as surveys, research, international technology exchanges, etc. concerning large dams and related facilities (below, “large dams”), in order to improve the design, construction, maintenance, and operation of large dams and to contribute to the development of the Japanese economy. Responsibilities include: Collection of information, surveying, and research concerning large dams (1) Exchange of technology and guidance concerning large dams (2) Participation in ICOLD, assistance with its activities, and international exchange of technology concerning large dams (3) Introduction of and spreading awareness of the achievements of surveys and research concerning large dams (4) Other activities necessary to achieve the goals of JCOLD In recent years, JCOLD has actively conducted a program of surveys and research on methods of harmonizing dam development with the environment and on ways to mitigate their environmental impacts to achieve the sustainable development of dams.