The Consistent Development in the Whole River System

Transcription

1 IEA :Implementing Agreement for Hydropower Technologies & Programs Workshop; Best Practices for Renewal and Upgrading of Hydropower Facilities to Maintain and Provide Value to the Power System, July 18, 2011 The Consistent Development in the Whole River System July 18, 2011 The KANSAI Electric Power Co., INC Takashi AKIYAMA

2 Contents 1 Consistent development of the whole river system Integrated management of water resources in the Kiso River system History of hydropower development Improvement of the river flow Redevelopment of existing power plants Integrated management of sedimentation in the Kurobe River system Sediment Flushing Operation

3 Consistent development of the whole river system 2 The concept in Japan Consistent river-system development involves setting up a reservoir at the most upper-reach of the river system for improved river flow, and making maximum use of the river's elevation head and water flow to achieve a large peak output across the whole river system.

4 The position of each river system The Sea of Japan Sho River Jinzu River 3 Lake Biwa Kurobe River Osaka Kiso River Osaka Tokyo Pacific Ocean 0 50km 150 hydropower stations

5 Contents 4 Consistent development of the whole river system Integrated management of water resources in the Kiso River system History of hydropower development Improvement of the river flow Redevelopment of existing power plants Integrated management of sedimentation in the Kurobe River system Sediment Flushing Operation

6 Year The history of hydropower development in the Kiso River 5 Elevation Miura Dam Dam-type Waterway-type Waterway-type Hydropower development 1910~1920 Dam-type Hydropower development 1920~1945 Consistent development in the whole river system Large dam development 1945~1960 Redevelopment of existing plants 1960~1980 Maximum Discharge Electricity demand In Japan 1,000MWh Nuclear Hydro Thermal

7 Hydropower Development in Kiso River System 6 Hydropower 32 stations Total:1,040MW Miura Dam Miura Takikoshi Otaki River Ontake Tokiwa Mio Nezame Suhara Kiso Okuwa Hashiba Agematsu Momoyama Inagawa Inagawa No.2 Ainosawa Tako Yomikaki Yogawa Shizumo Yamaguchi Tsumago Araragigawa Shin ochiai Ochiai Minokawai Kaneyama Imawatari Yaotsu(closed) Maruyama Shin maruyama Kasagi Shin ohi Ohi Kiso River River channel length: 227km Catchment area: 9,100km (km) Downstream

8 Miura power plant 7 Following the startup of Miura Dam, the annual river flow of Kiso river was improved as illustrated below (m3/s) 30 Flow duration curve for Kiso River Before startup of Miura Dam After startup of Miura Dam Maximum discharge of Miura power plant 15 Miura Dam (Miura Power Plant) Maximum output:7,700kw Maximum discharge:17.5m3/s Effective head:54.7m (days)

9 Redevelopment of hydropower plant, Kiso & Yomikaki P/S 8 Elevation Elevation Following completion of the Miura Reservoir in 1942, the duration of Kiso River was improved Miura(7,700kW, startup in 1945) Kiso (116,000kW,startup in 1968) Nezame(35,000kW,startup in 1938) Agematsu(8,000kW,startup in 1947) Momoyama(24,600kW,startup in 1922) Suhara(10,000kW,startup in 1921) Okuwa(12,100kW,startup in 1920) Yomikaki#1(42,100kw,startup in 1923) Kiso power plant makes use of surplus river flow which is generated by operation of Miura Dam Nezame Agematsu Momoyama Suhara Okuwa Yomikaki No.2 (70,000kw,startup in 1960) Maximum discharge(m3/s) Maximum discharge(m3/s)

10 The position of Kiso power plant Miura Dam 9 New power system with higher efficiency Prioritized operation bottom top Kiso Dam Nezame P/S Kiso water intake Dam weir Kiso P/S m3/s m3/s m3/s m3/s m3/s Nezame P/S

11 Development image of Yomikaki No.2 power plant 10 : Old system : New system Weir Dam Yomikaki No.1 power plant Yomikaki No.2 power plant

12 Optimal use of existing facilities 11 No.1 plant headrace tunnel Cross-section of No.1 plant intake Newly constructed Yomikaki Dam Redeveloped plant intake No.1 Newly constructed No.2 plant intake Decommissioned part of No.1 plant headrace tunnel

13 Contents 12 Consistent development of the whole river system Integrated management of water resources in the Kiso River system History of hydropower development Improvement of the river flow Redevelopment of existing power plants Integrated management of sedimentation in the Kurobe River system Sediment Flushing Operation

14 Hydropower development in the Kurobe River System 13 The sea of Japan Kurobe River O River Sasa River Unazuki Aimoto Otozawa Yanagawara Kuronagi No.2 Kurobe No.2 Shin kurobe No.2 Kurobe No.3 Shin kurobe No.3 Kurobe No.4 Kurobe Dam (km)

15 Kurobe Dam Height:186m (the highest in Japan) Kurobe Dam 14 Kurobe River No.4 Power Plant Maximum output: 335,000kW

16 Elevation [m] River profiles 15 Kurobe River Shou River Average river gradient : 1/40 River gradient around the source of the river: 1/20~1/ Kiso River Shinano River 0 Seine River Distance (km)

17 Background of flushing operation 16 Situation The amount of inflowing sediment into dams is huge compared with reservoir capacities. It is difficult to transport excavated or dredged materials to the downstream under the conditions of steep gorge. Blocking the flow of sand and soil causes raising the riverbed at the upstream lowering the riverbed or coastline set back at the downstream A more comprehensive soil management approach is needed.

18 Upstream Longitudial section Outline of Dashidaira dam 17 Head tank Power Station Catchment area Power Plant Dam Reservoir Flushing channel Flushing gate km 2 Name Otozawa Maximum Output 124MW Type Concrete gravity Height 76.7m Length 136.0m Total Capacity 9.01 x 10 6 m 3 Effective Capacity 1.66 x 10 6 m 3 Operation area 18m Number 2 Area 5.0 x 5.0m Upstream Slide gate Center Roller gate Downstream Radial gate Spillway gate Slide Gate Roller gate Radial gate Flushing channel Flushing channel

19 Outline of flushing facilities 18 Flushing channel Slide gate For maintenance Radial gate For prevention of seepage Flow Moving protection flame Roller gate For flushing control

20 Flushing operation 19 Drawdown Unazuki Dam Dashidaira Dam Flushing through a low-level outlet Unazuki Dam Dashidaira Dam Dashidaira Dam Refill Unazuki Dam

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22 Sedimentation volume of Dashidaira reservoir 21 Accumulated sediment [x10 4 m 3 ] Huge flood Initial flushing 460,000m 3 Trial flushing 20,000m 3 Emergency flushing 1,720,000m 3 340,000m 3 Emergency flushing 800,000m 3 Emergency flushing 460,000m 3 60,000m 3 590,000m 3 280,000m 3 90,000m 3 120,000m 3 350,000m 3 160,000m Data /6 Test flushing 80,000m 3 700,000m 3 Flushing 1995/7 1995/ ,000m 3 240,000m 3 370,000m 3 Cooperative flushing /7 2004/7 2005/7 2006/7 2007/6 2008/6 2009/7 2010/6

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