Adaptation Strategy for Climate Change in Japan

Transcription

1 French Japanese Dutch workshop on impacts of climate change on hydrology Adaptation Strategy for Climate Change in Japan July 15, 2008 Toshio Okazumi Director for International Water Management Coordination Ministry of Land, Infrastructure, Transport and Tourism Government of Japan

2 Japan is vulnerable to climate change. Kinki Region 1. Present conditions in Japan Kanto Region Amagasaki Station Yodo River Shin-Osaka Station Osaka Station Osaka Castle Tennouji Station Kanzaki River Neya River Hirano River Ikebukuro Station Shinjuku Station Shibuya Station Tokyo Station Ueno Station Kanda River Shibuya River Meguro River Sumida River Tone River Ayase River Ara River Shinnaka River Kameido Station Kinsicyo Station Old Edo River Elevation Elevation 3m 4m 1m 3m 0m 1m -1m 0m -1m Water Area About 50% of population and about 75% of property on about 10% of land lower than water levels in rivers during flooding 3m 4m 1m 3m 0m 1m -1m 0m -1m Water Area

3 Japan, France and the Netherlands 1. Present conditions in Japan France The Netherlands About km About 1/1,650 largest flow discharge Seine River 2,400 About 1,000mm About 79.4mm (Montsouris) About 47.4mm (Montsouris)

4 Mechanism of global warming and climate change (impacts on water-related disasters) 2. Outline of the IPPC AR4 Report Large volumes of greenhouse gas emissions cause CO 2 concentration in the air to rise and increase heat absorption, resulting in temperature rise. Thus, global warming occurs. Melting of glaciers, ice caps and ice sheets Thermal expansion of sea water Change in evapotranspiration Change in snow accumulation condition Sea level rise (Maximum rise: 59 cm) More intense typhoons Increase of precipitation by a factor of 1.1 to 1.3* More frequent heavy rains and droughts Earlier snow melt and reduction of discharge Increase of river flow rate Change in water use pattern More frequent high tides and coastal erosions More frequent floods More serious debris flow Higher risk of drought

5 Rises of temperature and sea level 2. Outline of the IPPC AR4 Report -Temperature is expected to rise by about 0.2per decade in the next 20 years. -Global average surface temperature is expected to rise by 1.8 to 4.0in 100 years' time from now. -Global average sea level is expected to rise by 18 to 59 cm in 100 years' time from now. -Global warming and sea level rise will continue over several centuries even if green-house gas emissions are controlled. Average temperature Average sea level Rise of global average surface temperature () Case where CO 2 concentration in 2000 will remain unchanged 20th century Year Rise of 4.0 Rise of 1.8 A1: High growth oriented society A1Fl: Dependent on fossil energy sources A1T: Dependent on non-fossil energy sources A1B: Emphasis on the balance among various energy sources A2: Multipolarized society B1: Sustainable growth oriented society B2: Emphasis on regional initiatives Source: IPCC AR4 WG1 (Working Group 1) Summary for Policymakers (Japan Meteorological Agency) -Solid lines indicate rises of global average surface temperature in each scenario identified using multiple models. -Shaded areas indicate the range of standard deviations of average annual temperature for each model. Change in sea level (mm) 590mm Peak Source: Data prepared by the River Bureau based on the IPCC AR4 WG1 Report Rises of average temperature and sea level at the end of the 21st century Temperature rise Sea level rise Source: IPCC AR4 WG1 Report Society achieving both global environmental protection and economic development About 1.8 (from 1.1to 2.9) Sea level rise Society achieving high economic growth dependent on fossil energy sources About 4.0 (from 2.4to 6.4)

6 Resolution of climate change prediction models 3. Impacts of heavy rains Resolution of climate change prediction models has been improved year by year. IPCC First Assessment Report (1990): Horizontal resolution of about 500km 500 km 250km IPCC Second Assessment Report (1996): Horizontal resolution of about 250 km IPCC Third Assessment Report (2001): Horizontal resolution of about 180km 180 km IPCC Fourth Assessment Report (2007): Horizontal resolution of about 110km 110 km GCM20 GCM20RCM20 and RCM20: Horizontal resolution of about 20 20km Mesh sizes are simply indicated regardless of actual mesh locations. Prediction model in this study

7 Estimation of increased rainfall in region 3. Impacts of heavy rains Future rainfall amounts were projected as a median value in each region of Average rainfall in period Average rainfall in period The above equation was obtained based on the maximum daily precipitation in the year at each survey point identified in GCM20 (A1B scenario). Hokkaido Tohoku Kanto Hokuriku Chubu Kinki Southern Kii San-in Legend Setouchi Southern Shikoku Kyushu

8 Declining return period by increasing rainfall 3. Impacts of heavy rains Return period of flood is declining by increasing rainfall in the future. Therefore declining future flood safety level is estimated. Image of declining return period at certain area Maximum daily rainfall 1.2 return period current future 1/100 1/ 50 current data projected data Rainfall probability sheets r rainfall

9 annual exceedance probabilitythe degree of safety level Impact for flood safety level by changing rainfall after 100 years Number of Number of Number of river system river system river system annual exceedance probability Declining All Japan Current Target Hokkaido Tohoku Kanto Hokuriku Cyubu Kinki Southern Kii Saninn Setouchi Southern Shikoku Kyuusyuu Declining the degree of safety against flood by increasing future rainfall Flood safety levelannual exceedance probabilityflood safety level Current Target Current Target Hokkaido Hokkaido Tohoku Tohoku Kanto Kanto Hokuriku Hokuriku Cyubu Cyubu Kinki Kinki 3. Impacts of heavy rains Circled number is number of calculated river system Southern Kii Southern Kii Saninn Saninn Setouchi Setouchi Southern Shikoku Southern Shikoku Kyuusyuu Kyuusyuu Flood safety level

10 Changes of peak runoff by future rainfall 3. Impacts of heavy rains Estimations of future rainfall are about compare to current rainfall. Peak runoff will be estimated about compare to current rainfall in 9 major rivers. Design Rainfall Ishikari Riv. Design Level (Hokkaido) Basin Area 12,697 2 Peak Runoff of Design Flood 18,000 m 3 s 20,500 23,000 25,600 30,700 Kitakami Riv. (Tohoku) 7, ,600 m 3 s 15,700 17,800 19,900 24,000 Tone Riv. (Kanto) 5,114 2 About 21,000 m 3 s (Calculated by 1/200) 23,600 25,900 27,900 31,800 Kurobe Riv. (Hokuriku) ,200 m 3 s 8,100 8,900 9,700 11,300 Izumo Riv. (Cyubu) ,000 m 3 s 9,000 9,900 10,900 12,800 Kinokawa Riv. (Kinki) 1, ,000 m 3 s 17,600 19,700 21,600 25,400 Oota Riv. (Cyugoku) 1, ,000 m 3 s 13,100 14,700 16,300 19,400 Naga Riv. (Shikoku) ,200 m 3 s 12,800 14,500 16,100 19,300 Kase Riv. (Kyusyu) ,400 m 3 s 3,800 4,100 4,500 5,300

11 More frequent and serious droughts 4. Impacts of droughts Comparison between present rainfall and predicted rainfall after 100 years shows decrease in most area in March - June Comparison between present conditions(1979 to 1998) and future rainfall(2080 to 2099) in Class A river Reduction of river flow in the periods requiring irrigation water, e.g. during the surface soil puddling in paddy fields, may be deteriorated to water use for rice farming. Legend Future water volume/present water volume Future water volume/present water volume < Future water volume/present water volume < Future water volume/present water volume < 1.0 Future water volume/present water volume < 0.8 Spring (March through June) Source: Water Resources in Japan 2007, Land and Water Bureau, Ministry of Land, Infrastructure and Transport

12 Frequent and more serious droughts 4. Impacts of droughts In the upper Tone River, snow cover is likely to decrease considerably. That will accompany the reduction of river flow rate in the snow melt season or in early spring. With global warming, (i) earlier snow melt and (ii) reduction of snowfall induce changes in river flow rate, and (iii) earlier surface soil puddling in paddy fields is expected to cause the annual water demand pattern to change and to have serious impacts on water use. Snow cover (cm) Change in snow cover in 100 years' time due to further global warming (Fujiwara) Average Future October 1 November 1 December 1 January 1 February 1 March 1 April 1 May 1 *Prepared by Water Resources Department, Water and Land Bureau, Ministry of Land, Infrastructure and Transport based on Regional Climatic Model (RCM) 20, a global warming prediction model, developed by Japan Meteorological Agency. (ii) Reduction of river flow rate due to reduction of the amount of snowfall River flow (m 3 /sec) Future (i) Earlier discharge due to earlier snow melt Reduction of river flow during the surface soil puddling in paddy fields Present (iii) Insufficient river flow even when the surface puddling starts earlier (requiring large amounts of irrigation water) Source: Water Resources in Japan 2007, Land and Water Bureau, Ministry of Land, Infrastructure and Transport January April Surface soil puddling period Release of reservoir water not contributing to effective water use Where the reservoir is full, released water is not used effectively. July October

13 Impacts of sea level rise: Increase of areas below sea level, and of risks of inundation due to high tides 5. Impacts of sea level rise Increases of below-sea-level areas in three large bay areas (Tokyo Bay, Ise Bay and Osaka Bay) Ashiya City to Osaka City Kawagoemachi to Tohkai City Yokohoma City to Chiba City Osaka Bay Ise Bay Tokyo Bay Areas with flood risks due to high tides will increase. *Prepared by the River Bureau based on the national land-use digital information. *Shown are the areas at elevations lower than sea level shown in a three-dimensional mesh (1 km x 1 km). Total area and population are based on three-dimensional data. *No areas of surfaces of rivers or lakes are included. *A premium of 60% is applied to the potential flood risk area and to the population vulnerable to flood risk in the case with a one-meter rise of sea level. Present After sea level rise Rate of increase Area (km k 2 ) Population (Million)

14 Recommendations of this study 6. Japan's response to climate change Climate change due to global warming is expected to induce the following phenomena in coastal and low-lying areas. -More frequent heavy rains and more intense typhoons Frequent and serious flood and sediment disasters -Sea level rise and more intense typhoons Frequent and serious high tides and coastal erosions -Wider range of variation of rainfall intensity and change of river flow regime Frequent and serious droughts Recommendation1. Basic concept for Future ideal society Combining mitigation and adaptation aiming at Sustainable and Water Disaster Adaptable Society Recommendation2. Basic direction of climate change adaptation measures 1. Adaptation measures to achieve "zero casualty" should be considered because Zero damage from disasters is difficult. 2. In a nerve center like the Tokyo metropolitan area, intensive efforts should be made such as preventing from ceasing national function

15 Recommendations3. Multiple measures for increasing in hazard 6. Japan's response to climate change Red figures indicate present degree of safety against flood. Present Image of flood disaster adaptation measures Future For example, after 100 years Blue figures indicate future degree of safety against flood. 1/150 1/150 Degree of safety against flood presently aimed at Degree of safety against flood presently aimed at would deteriorate with future increase of precipitation. Reconfiguration of river improvement for increasing external force Adaptation by Structural measures 1/70 Degree of safety against flood presently secured Degree of safety against flood currently aimed at in 100 years' time Deterioration of the degree of safety against flood currently secured 1/40 1/20 Degree of safety against flood aimed at Degree of safety against flood secured 1/20 Comprehensive flood control measures Adaptation measures based on regional development through such actions as restrictions on and review of land use

16 Recommendation4. Importance of Flood Risk Assessment ex) Adaptation measures programming in river basin 6. Japan's response to climate change Flood Analysis in Tone River Flooding area IV Flooding Area V Bank of Road and Railway Small River Flooding Area I Flooding Area II Flooding Area VI Flooding Area III Image of Flooding Area II Each flooding area divides into blocks by river, bank of road and railway. Measures will be set up by each blocks. Divide flooding areas based on Its phenomena

17 Recommendation4. Importance of Flood Risk Assessment Concept of Flood Risk Assessment 6. Japan's response to climate change [Hazard Index] is increasing by Climate Change. For reduction of [Disaster risk], increasing [Disaster Prevention Index] and reducing [Affection Index] by adaptation measures such as improvement of facility, revise of land use, enforce of emergency response Disaster Risk Hazard Index Affection Index Disaster Prevention Index Hazard Index : Natural hazard and Land condition Climate, Hydrology, Land Feature, Geologic Condition, etc and Scale of Hazard Affection Index : Social vulnerability of disasters Inundation people, Inundation houses, impacts of Road, Railway, Lifeline, etc Disaster Prevention Index : Disaster prevention activity by Central Government, Local Government, community Present status of facility improvement, Public preparedness for disasters Probability block Index of Potential Victims f=index of Potential Victims Flood areas are Frequency Probability divided into blocks by considering land Category by Risk Scale feature such as bank High Middle Low High Middle Low Probability Probability Probability Probability Probability Probability of river, road, railway. Index of Victims Index of Victims High Risk

18 Recommendation4. Importance of Flood Risk Assessment Evaluation of risks and programming adaptation measures 6. Japan's response to climate change Programming based on considering evaluation items, alternates and costs in each and mutual drafts Necessity of considering multiple index of affection 1 2 i i Ci i Maximize target function under restriction of assessment contents and adaptation measures etc. i i Weighting factor of each assessment Affection Index n

19 Recommendation4. Importance of Flood Risk Assessment Evaluation Risks and Programming adaptation measures 6. Japan's response to climate change Expression effectiveness of risk reduction by adaptation measures by color difference Bank Improvement ST Bank of Road and Railway Risk reduction by adaptation measures High Risk medium and small size rivers

20 Recommendation5. Appropriate combination of practical measures Adaptation measures by using structural method 6. Japan's response to climate change Improvement of the credibility of structure, effective and multipurpose and long-life utilization of existing structure International Stadium Yokohama Final game of the World Cup was held in 2002 Improvement structure Multipurpose retarding basin of Tsurumi River Overflow levee Tsurumi River tide gate Before Karasuyama River Multipurpose retarding basin of Tsurumi River aging revetment by deteriorated concrete After flood control Dam River improvement of Tsurumi river Rehabilitation of aging revetment by setting up anterior wall

21 Recommendation5. Appropriate combination of practical measures Adaptation measures by using regional development 6. Japan's response to climate change Response to floods that cannot be dealt with by facility-based measures, through land use or community development allowing inundation. Shift to land use or ways of living that minimize damage circle levee River improvement of continuous levee River improvement for protection of specified areas by using circle levees Designation of potential disaster hazard area Restrictions on land use by designating potential disaster hazard areas Shift to community planning resistant to inundation Class 2 disaster hazard area Class 4 disaster hazard area Class 3 disaster hazard area Class 1 disaster hazard area Sample ordinance restrictions (Nagoya City) Adopting pilotis to prevent damage to buildings during a flood

22 Recommendation5. Appropriate combination of practical measures Adaptation measures centering around risk management 6. Japan's response to climate change Building of a wide-area disaster prevention network that connects embankments, roads on the dry river bed for emergency traffic and elevated roads to wide-area disaster prevention bases. Reinforcement of actions in the initial stages of a disaster for minimizing damage and restoring infrastructure early, and enhancement of an organizational setup to achieve the goal Technical Emergency Control Force (TEC-FORCE) TEC-FORCE Organizational setup Staff of Regional Development Bureaus and Offices Field support center Engineers of National Institute for Land and Infrastructure Management and Public Works Research Wide-area infrastructure force Institute (rivers, roads, sediment control, ports, etc.) Technical support group (engineers) Sewerage system force Building land force Buildings force Private sector construction organizations Contract/ agreement (operators of equipment) Coordination Staff of local public entities Network of roads and river embankments Inundation of Route 34 during a flood in July 1990 Image of road-embankment connection Activities -Investigation of damage -Quick repairing -Prediction of degree of damage risk -Planning of control measures -High-level technical guidance -Assistance in reconstruction Drainage pumping vehicle Disaster control helicopter

23 Recommendation5. Appropriate combination of practical measures Adaptation measures based on risk management 6. Japan's response to climate change Share preliminary information concerning the degree of flood risk Water levels in built-up areas in the past floods are indicated on the hazard map. Information dissemination channel Flood hazard map of xx City Locations and names of shelters Points of contact -Administrative organizations -Medical institutions -Lifeline systems management organizations Underground space Toyooka City, Hyogo Prefecture Flood Embankment Shelter (building) Hints on escape and necessities Potential inundation areas and depths of inundation Image of a flood hazard map Easily recognizable signs

24 Recommendation5. Appropriate combination of practical measures Adaptation measures based on risk management 6. Japan's response to climate change Share real-time information Provision of rainfall amounts and water levels real-time via cellular phone, the Internet or local disaster prevention radio Flood forecasting through real-time simulation Rainfall measurement station Radar observation station Rainfall measurement station Radar precipitation prediction Relay station Gauging station Gauging station Information provision via cellular phone or personal computer Delivery of an image to a TV screen Flood alarm office Surveillance camera River office Flood (water level) prediction system Meteorological observatory Floodwater prediction through real-time simulation

25 Considerations to be taken for implementation 6. Japan's response to climate change (1) Inter-governmental efforts (2) Promotion of cooperative work with the public (3) Priority investment in preventive measures (4) Clear prioritization (5) Preparation of road maps (6) Adoption of a flexible approach (7) Cooperation with related organizations (8) Developing new technologies and contributing to the international community (9) Promotion of research and application of their results to plan flood control, water use, and environmental conservation

26 Future timeline for implementation of this study 6. Japan's response to climate change Flood Risk Monitoring Phase Examination about improvement of adaptation measures Make road map Drawing up adaptation measures Reduction risks by adaptation measures Phase Range of prediction Accuracy enhancement Range of prediction Evaluation of Phase I activity Implementation adaptation measures by result of evaluation Revise the road map Revising adaptation measures by analysis of water-related disaster risks with improvement of flood prediction by monitoring changes of climate change and social condition. Now 5 years later

27 Introduction on adaptation measures in Tsurumi river

28 Outline of Tsurumi River (Geography) 8. Adaptation measures in Tsurumi River Hill / tableland 70 Alluvial lowland 30 Riverbed gradient : 1/250 Tokyo Kanagawa Pref. Chiba Pref. Tsurumi river basin Middle section with stepped cross section Tsurumi River elevation 020m Onda River Tsurumi River Hayase- River Tsurumi River Densely-populated downstream section Toriyama River Upstream section below grand level Riverbed gradient 1/1,000

29 Outline of Tsurumi River (Urbanization and population increase) Urbanization ration has increased by 75% in 50years 8. Adaptation measures in Tsurumi River Rapid economic growth has turned natural area into urban area % Typhoon Karinogawa in Sep , , % Present 85% Typhoon No.17 in Sep ,200,000 1,880,000 Natural Area Urbanization Population Urban Area

30 Outline of Tsurumi River (Effect of urbanization) 8. Adaptation measures in Tsurumi River Population increased by 1.4 million in 50 years Function of keeping and retarding water became weakened 85% of river basin area urbanized Typical urban river As a result Before development Slight urbanization 1,300 m 3 /s Peak runoff Volume Doubles After development Significant urbanization Discharge into river has become faster Peak runoff has becomes bigger Present Difference 770 m 3 /s Before Development Runoff reaches its peak in 1/3 of time 23 3 hours 10 hours

31 Basic strategy for controlling inundation damage (Runoff allocation) Runoff allocation by target rainfall Peak runoff without discharge control 2,110m 3 /s Allocation in river basin250m 3 /s Existing and newly developed rainfall storage and infiltration facilities Rainfall storage and infiltration measures by municipalities Rainfall storage tubes by sewerage administrators Allocation in river 1,860m 3 /s Controlled by rivers Storage in flood control facilities and in retarding basins 8. Adaptation measures in Tsurumi River 205m 3 /s 15m 3 /s 30m 3 /s 1,500m 3 /s 360m 3 /s Under the future land use, runoff is estimated at Sueyoshibashi point based on the largest rainfall after 1945.

32 River related projects in Tsurumi River Basin inundation control plan 8. Adaptation measures in Tsurumi River Future flood control Existing retarding basin Administrator MLIT Tokyo Metropolitan Kanagawa Prefecture Yokohama City

33 Sewerage projects in Tsurumi River Basin inundation control plan 8. Adaptation measures in Tsurumi River Natural drainage area Pump drainage area (Name) Rainwater storage tube (Name)

34 Rainwater storage facilities 8. Adaptation measures in Tsurumi River Development of facilities for target rainfall Planned discharge in pump drainage areas City Yokohama Kawasaki Total Discharge area Tsuzuki Kouhoku Hokubu Kase Planned discharge 17m 3 /s 142m 3 /s 189m 3 /s 55m 3 /s 402m 3 /s City Yokohama Kawasaki Planned storage of major facilities Storage facility Shin hasue trunk line 410,000m 3 Kozukue chiwaka trunk line 256,000m 3 144,000m 3 Shibukawa rainwater storage tube Egawa rainwater storage tube Planned Storage 81,000m 3 Pump facilities Rainwater storage tube

35 Storage, infiltration and forest conservation 8. Adaptation measures in Tsurumi River Storage facilities in schools, parks and public houses Infiltration by permeable pavement Infiltration Inlet Infiltration trench Infiltration Inlet Infiltration trench Purchase and conservation of forest in developing area

36 Operation rule of pumping station 8. Adaptation measures in Tsurumi River Preparation of basic operation rules, communication, command and control, information sharing and public announcement Basic rules of restricted pump operation -River and sewerage administrators make basic rules of restricted pump operation to effectively decrease urban flood and inundation caused by heavy rainfall that exceeds the current project design target. Image of flood damage by drainage pump Drainage with a pump P P P Sewer Communication and information sharing -Related organizations jointly establish communication system for effective and efficient pump operation. -The administrators provide hazard information beforehand and ask for cooperation from residents. When pump operation is restricted, the administrators supply necessary information for residents smooth evacuation. Stopping drainage with a pump River River P P P :Drainage pump Although surface water damage along river is mitigated by pump drainage, river water flood may occur at the bottle neck of water way in the downstream Sewer :Drainage pump Surface water damage may occur around the drainage pump due to drainage restrictions

37 Public awareness to mitigate damages 8. Adaptation measures in Tsurumi River (Public awareness and education on disaster preparedness) To organize local meetings and raise public awareness on preparedness on disaster Education for pupils Disaster preparedness caravan Annual educational course for pupils on disaster preparedness at the Center Tsurumi River Administration Center To visit local meetings and explain to residents

38 Public awareness on flood damages (Advance dissemination of flood and inundation prone information) By simulating urban flood and inundation, municipalities prepare Hazard Maps Urban flood prone area River administrator Flood is estimated by levee break or overtopping. Urban inundation prone area (Sewerage administrator) Inundation by insufficient drainage On the basiscapacity is estimated. 8. Adaptation measures in Tsurumi River Hazard Map released by Yokohama City

39 Other measures (follow-up the plan) 8. Adaptation measures in Tsurumi River Implementation, monitoring, evaluation and modification of the plan Progress of major projects Implementation of river and sewage project Installation of rainwater storage and infiltration facilities Installation of rainwater storage and infiltration facilities Countermeasures against blocking rainwater infiltration Progress of rainwater storage and infiltration facilities constructed for development based on regulations and guidelines Changes of river basin Re-evaluation of latest development (area, location, type etc.) Modification of the plan

40 International Activities

41 Contribution to International Organization 7. International Activities Contribution to WMO/GWP (the Associated Programme on Flood Management) Purpose of Guideline Sustainable development considering flood risks which are changed by development Maximized social benefit in flood prone area for reduction of social vulnerability Minimized loss of life Conservation of environment Contribution to WMO/ESCAP Typhoon committee Technical contribution to hydrological component in terms of reduction of typhoon damages in asiapacific region 2 regional incorporation programme (RIP) (Hazard Map and Landslide Warning System) are ongoing and holding workshop Contribution to WWAP (World Water Assessment Programme) WWAP from phase I in Oct 2000 to ongoing phase III, Since Japanese government strongly support WWAP financially and technically Japanese expert who related in WMO contribute to APFM which is producing IFM (Integrated Flood Management) guideline (2002) Contribution to UNESCO s IRBM (Integrated River Basin Management) MLIT, JWA, ICHARM contribute their expertise and technology

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43 Increasing External Forces and Impacts on Land and Society Regional Climate Models (RCM20 and GCM20) The recently developed simulation model enables more detailed regional climate prediction. Regional Climate Models Coupled Atmosphere-Ocean-Sea Ice Model for the Earth Simulator (CFES) Spatial resolution Atmosphere: 280 km x 280 km (30 layers) Ocean: Longitude 2.5 degrees/latitude 0.5 to 2.0 degrees (23 layers) GCM20 (General Circulation Model) RCM20 (Regional Climate Model) Areas to be Calculated Horizontal Resolution Number of Vertical Layers Global scale About 20 km Number of meshes 1920 x 960 Japan and surrounding areas About 20 km 60 layers 36 layers Number of meshes 129 x 129 Climate model for Asia 60 km x 60 km (36 layers) Lateral Boundary Conditions N/A, as this is a global scale model. Climate model for Asia Climate model for Japan 20 km x 20 km (36 layers) Concept of lateral boundary conditions of RCM20