Sustainable. Infrastructure and Asset. Management. Kiyoshi KOBAYASHI

Transcription

1 Sustainable Infrastructure and Asset Management Kiyoshi KOBAYASHI

2 What is Asset Management? The optimal allocation of the scare budget between the new arrange-ment of infrastructure and rehabilitation/maintenance of the existing infrastructure to maximize the value of the stock of infrastructure and to realize the maximum outcomes for the citizens

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5 Asset management Pavement management (highway, runway) Railway management Bridge management Facility management Tunnel management Water supply system management Port facility management Embankment management Slope management River facility/dam am facility management Forest management

6 Dam Facility Management Long-term Sustainable Infrastructure Comprehensive management of sedimentation systems ( environmental change, ecological impacts, riverbed degradation, river morphology change, and coastal erosion ) Large-scale risks ( socio-economic change, volatility in sedimentation, green house effects )

7 Dam facilities based on renewal duration and management points Renewal duration Short Several yrs - Several 10 yrs Long Several 10 yrs - Several 100 yrs Facilities Mechanical Electrical Architectural Reservoir (Sedimentatio n) Management points Reduction of total cost of Inspection, Maintenance, Repair and Long Renewal Life Reduction of Life Cycle cost Others Improvement of service level Technical Innovation Renewal duration will be expanded by proper countermeasures Extra long Occasional Dam body Reservoir slope Land slide Earthquake Reduction of Inspection and Maintenance cost Risk assessment Inspection Immediate action No Renewal will be necessary for extra long duration and present value of the renewal can not be Respond evaluatedup to certain level during construction period

8 Hierarchical asset management cycles See Plan Budget allocation benchmarking innovation See Plan R/M strategies Do Do Plan R/M activities See Do

9 Probabilistic analysis of reservoir sedimentation Specific sediment yield(m 3 /km 2 /year) Year KAWAMATA dam (Tone River) Annual record of specific sediment yield can be plotted on log-normal probability paper using Weibull plot. F(x i )=i/(n+1) Non-exceeding probability F(%) Specific sediment yield (m 3 /km 2 /year)

10 Expected gross storage capacity change without sedimentation management All new proposal and under construction projects included Existing storage capacity Capacity(100million m 3 ) Total storage capacity Total sedimentation Without new dams Sedimentation rate 0.24%/ yr 0 Year Capacity(100millionm 3 ) Total st orage capacit y Total sedimentation Without new dams Sedimentation rate 0.42%/yr Year Japan Chubu Region

11 Reservoir sedimentation in Sakuma dam J-Power (EPDC) 1956 Power generation Gravity concrete Height=155.5 m

12 Future estimation of reservoir sedimentation in Sakuma dam 平 岡 ダム 標 高 (ELm) クレスト 敷 高 EL246.5m 新 豊 根 発 電 所 放 水 口 101yr 201yr 豊 川 用 水 取 水 口 220 佐 久 間 発 電 所 取 水 口 昭 和 55 年 度 最 深 河 床 高 ダムからの 距 離 (km) 佐 久 間 ダム 建 設 前 の 河 床 高 予 備 放 流 水 位 常 時 満 水 位 堆 砂 101 年 後 堆 砂 201 年 後 建 設 前 河 床 勾 配 の1/ 2 勾 配 で 堆 砂 ( 泰 阜 ダムの 実 績 値 ) 建 設 前 河 床 勾 配 の1/ 3.2 勾 配 で 堆 砂 ( 平 岡 ダムの 実 績 値 ) 平 岡 地 区 護 岸 高 天 竜 中 学 校 構 内 平 岡 PS 放 水 位

13 Sedimentation management dams in Japan Classification Place Details of sediment control measures Examples in Japan Reducing sediment flowing into reservoirs Upstream reservoirs End of reservoirs Reduction of sediment production by hillside and valley works Regulation of reservoirs and sediment by erosion control dams and slit dams Reduction of discharged sediment and river course stabilization by channel works Sediment check dam Regurally excavating and recycling for aggregate or sediment supply to downstream river Sabo area, Changing from sediment check dams to sediment control dams (slit dams) Miwa Dam, Koshibu Dam, Nagashima Dam, Matsukawa Dam, Yokoyama Dam 57dams End of reservoirs Sediment bypass Asahi Dam, Miwa Dam, Koshibu Dam, Matsukawa Dam, Yokoyama Dam Sediment routing Sediment sluicing Sabaishigawa Dam Dashidaira Dam-Unazuki Dam (Coordinated sluicing ) Sediment management Inside reservoirs Non-gate botom outlets (natural flushing) Masudagawa Dam Density current venting Botom outlets for flood control Koshibu Dam, Futase Dam, Kigawa Dam Non-gate conduits with curtain wall Katagiri Dam Selective withdrawal works Yahagi Dam Drawdown flushing Sediment flushing outlet Dashidaira Dam-Unazuki Dam (Coordinated flushing ) Sediment flushing Inside reservoirs Partial flushing without drawdown Sediment scoring gate Senzu Dam, Yasuoka Dam Sediment scoring pipe Ikawa Dam Excavating & Dreging Recycling for concrete aggregate Miwa Dam, Koshibu Dam, Sakuma Dam, Hiraoka Dam, Yasuoka Dam Soil improving material, Farm Land filling, Banking material Miwa Dam, Yanase Dam Sediment replacing inside reservoir Sakuma Dam Sediment supplying to downstream rivers Akiba Dam, Futase Dam, Miharu Dam, Nagayasuguchi Dam, Nagashima Dam

14 Reservoir sedimentation Upstream Coarse sediment Fine sediment Dam body Excavated and utilized for Kobe Airport

15 Development of efficient and environmentally compatible sediment management techniques "Take", "Transport" and "Discharge" - Sediment flushing/sluicing and sediment bypassing should be introduced more. - The sediment trucking and supply, and the Hydro-suction Sediment Removal System (HSRS) are needs to be improved furthermore and introduced as supplementary measures.

16 Asset management Life cycle cost (LCC) minimization Rehabilitation and Maintenance from proactive maintenance to preventive maintenance Operation, Replacement, Expansion, Removal, Real Option

17 Asset management technology 1 Inspection technology Inventory Database Tool box Performance curve (Markov matrix) LCC evaluation (Markov decision model) Computer systems

18 Asset management technology 2 Process evaluation/reengineering Policy evaluation (outcome/output/input) Performance-based asset management contract Citizen participation

19 Two-staged project t 0 t 1 t Cost 30 billion JPY 70 billion JPY 100 billion JPY Benefit three scenarios 1/3 18 billion JPY 1/3 90 billion JPY 1/ 3 0 billion JPY

20 Cost-benefit analysis B = (1/3) (1/3) 90 + (1/3) 0 = 90 C = 100 B - C = = - 10 decline

21 Real Option Additional cost 70 billion JPY B C = = 110 Scenario 1 B C = = 20 Scenario 2 B C = 0-70 = - 70 Scenario 3 decline (1/3) 110+ (1/3) 20 + (1/30) 0 =43.3 Real Option = = 13.3 > 0 investment

22 Life cycle course decision making as a real option university occupation spouse

23 integrity responsibility accountability