Development of JMA storm surge model
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1 2 nd JCOMM Scientific and Technical Symposium on Storm Surges 8-13 November 2015, Key West, Florida, USA Development of JMA storm surge model Hiroshi HASEGAWA Office of Marine Prediction, Global Environment and Marine Department Japan Meteorological Agency 1
2 Contents JMA storm surge model Storm Surge Watch Scheme (SSWS) Multi-Scenario predictions for SSWS Finite Element Method (FEM) model 2
3 Contents JMA storm surge model Storm Surge Watch Scheme (SSWS) Multi-Scenario predictions for SSWS Finite Element Method (FEM) model 3
4 JMA storm surge model JMA operates two storm surge models. 1. Japan area (to issue warning and advisory for Japan) 2. Asia area (to provide SSWS information for Typhoon Committee members) Japan area model Asia area model RSMC Tokyo region 4
5 Specifications Japan Area Asia Area Model 2 dimensional non-linear model 2 dimensional linearalized model Coordinate Lat/Lon Cartesian grid Arakawa C-Grid Lat/Lon Cartesian grid Arakawa C-Grid Area 20.0N~50.0N, 117.5E~150.0E 0.0N~46.0N, 95.0E~160.0E Resolution 45 x30 ~12 x8 (1km~16km) Adaptive Mesh Refinement (AMR) 2 x2 (~3.7km) Time step 4 seconds 8 seconds Forecast range 39 hours 72 hours Calculation run 8 times/day (3 hourly) 4 times/day (6 hourly) Initial time 00,03,06,09,12,15,18,21 UTC 00,06,12,18 UTC Number of prediction courses In case of typhoons: 6 courses (Center, 4 courses on the forecast circles, NWP predicted course) No typhoon: 1 course (NWP predicted course) In case of typhoons: 1 course (Center on the forecast circles) No typhoon: 1 course (NWP predicted course) Forcing MSM (Meso Scale Model) GPV (5km) GSM (Global Spectral Model) GPV (20km) Typhoon bogus Pressure profile: Fujita (1952) Gradient wind (with inflow angle 30 deg.) Asymmetric component by typhoon movement Both models don t include inundation, ocean wave and river water. 5
6 Adaptive Mesh Refinement We are interested in storm surges in beaches, not offshore. Shallow water: fine mesh Deep water: coarse mesh Fine mesh only in coastal area Number of grid < 1/10 Fast calculation 6
7 Runs for 5 possible typhoon tracks The model runs for 5 possible tropical cyclone tracks to cover a major set of scenarios. 1. Center track with highest possibility 2. Faster track 3. Rightward biased track 4. Slower track 5. Leftward biased track (Ensemble prediction system for Japan area storm surge model is being developed.) 7
8 Contents JMA storm surge model Storm Surge Watch Scheme (SSWS) Multi-Scenario predictions for SSWS Finite Element Method (FEM) model 8
9 History th WMO Executive Council (Geneva, ) Request to WMO/SG to facilitate development of Storm Surge Watch Scheme th Regional Association II (Tashkent) st Typhoon Committee (Chiang Mai) plan for the establishment of a Regional Storm Surge Watch Scheme suitable for the TC region nd Typhoon Committee (Singapore) request to Members of providing tidal data & bathymetric data to RSMC Tokyo. (System development in JMA) RSMC Tokyo has started operation to provide storm surge distribution maps through its Numerical Typhoon Prediction (NTP) website RSMC Tokyo has started to provide storm surge time series charts. 9
10 Outline of SSWS JMA NWP routine GSM (Sea level pressure, wind) Typhoon information (location, central pressure, wind etc.) Products Products are provided to Typhoon Committee members via JMA Numerical Typhoon Prediction (NTP) website. Time series chart (currently provided for 51 locations) Asia area storm surge model Storm surge distribution map (3 hourly, up to 72 hours) 10
11 Problem Asia area storm surge model is based on one scenario by GSM and bogus. Deterministic forecast is insufficient for risk management. JMA plans to introduce multi-scenario predictions into the Asia area storm surge model. 11
12 Contents JMA storm surge model Storm Surge Watch Scheme (SSWS) Multi-Scenario predictions for SSWS Finite Element Method (FEM) model 12
13 JMA Typhoon EPS Multi-Scenario predictions for SSWS are based on JMA Typhoon EPS (TEPS) which was upgraded in JMA TEPS employs a low-resolution version of GSM. Previous system Current System Ensemble size Initial time Forecast range 00,06,12,18 UTC 132 hours Horizontal resolution TL319 (~55 km) TL479(~40 km) 13
14 Cluster analysis We are planning to select five scenarios from TEPS 25 members. (from restriction of computer resources ) Cluster analysis is adopted to determine the scenarios. Cluster analysis K-means method (N=25, K=5) Center of typhoon: x i = lll i, lll i, (i = 1,, N) Center of cluster: C k = 1 N k x i, (k = 1,, K) x 1,, x 25 C 5 C 1 C 4 C 2 C 3 Initial clusters are given appropriate variance with each other. Fix last cluster. Adopt the nearest members from each centers of cluster. 14
15 Outline of multi-scenario predictions JMA NWP routine TEPS (25 members) (sea level pressure, wind, typhoon track) GPV Asia area storm surge model Products Storm surge distribution map Cluster analysis (select five members) Typhoon information (central pressure, wind etc.) If two or more typhoons exist in model region, typhoon out of Japan region has priority for cluster analysis. Time series chart 15
16 Example T1330 (Haiyan) 7.Nov 12UTC initial 12m 07m 05m Colors: selected members 00 12p 16
17 Plans Multi-Scenario system and its products are going to be started and issued in In the next JMA super computer system (2018?~), some members going to be added for Probabilistic forecast. 17
18 Contents JMA storm surge model Storm Surge Watch Scheme (SSWS) Multi-Scenario predictions for SSWS Finite Element Method (FEM) model 18
19 Finite Element Method (FEM) In FEM, Model region is divided to finite elements. Any forms of element are valid (unstructured grid). FEM is suitable for storm surge calculation. JMA is developing FEM storm surge model aiming for practical use in the next JMA super computer system. 19
20 Generating unstructured grid Delaunay triangulation Coastal data: GSHHG (NOAA) Topography data: ETOPO (NOAA) Coastal data is modified to target resolution. For extremely large area, Delaunay triangulation is adopted for divided small areas, they are combined to one later. Ex.) Okinawa area Max resolution is 1 minute. 20
21 Summary JMA operates two storm surge models (Japan area, Asia area). In framework of SSWS, products of Asia area model is provided for typhoon committee members. Multi-scenario predictions are going to be introduced to Asia area model in JMA is developing also FEM model for next super computer system. 21
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