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A Typhoon Early Warning System for Guangxi Province, China

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A Typhoon Early Warning System for Guangxi Province, China Introduction Climate Decision: A Typhoon Early EXTRA slide Warning System for Guangxi Province, China China Resilience through knowledge [email protected] Guangxi Province, China Guangxi Province has a relatively small exposure – 125 miles of coastline as the crow flies – yet on average 5 tropical storms make landfall here every year. The coast of Southern China has seen China record-breaking typhoons for four years in a row: Vicente in 2012 Guangxi Province Haiyan in 2013 Rammasun in 2014 Mujigae in 2015. Vietnam Philippines At the same time, this region of China is undergoing unprecedented development placing population and assets at risk. Resilience through knowledge [email protected] Tropical storm hazards: wind, wave and storm surge Tropical storms present three types of hazards: Wind Wave Storm surge Our discussion today will focus on storm surge which is the rise of water generated by a storm above normal astronomical tides. Source: NOAA http://www.nhc.noaa.gov/surge/ Resilience through knowledge [email protected] Storm surge impacts Tropical storm fatalities: major events since 1900 Worldwide since 1960, storm surge is responsible for the greatest share of 400,000 fatalities due to natural catastrophes. (Dube, 2007) 350,000 300,000 In China, coastal flooding from Typhoons Rammasun (2014) and Mujigae (2015) led 250,000 to loss of life and widespread property 200,000 damage. TS Nargis Death Toll Death 150,000 100,000 50,000 0 Source: http://www.wmo.int/pages/prog/arep/wwrp/pdf%20files/6%20Nov/SDube.pdf https://en.wikipedia.org/wiki/List_of_natural_disasters_by_death_toll Resilience through knowledge [email protected] Why do you need a storm surge model? Tropical storm track forecasts have improved markedly over the last four Washington, DC decades. The average error for a 72-hour Atlantic forecast improved from 330 miles (1985) to 80 miles (2015). However, storm surge is sensitive to track position, angle of approach and slight changes in storm intensity, forward speed, size, central pressure and the shape and characteristics of coastal features such as Wind direction bays and estuaries. Hurricane Sandy (2012) storm We ran simulations of the Hurricane Sandy params (RMW, vmax . ) storm on the Hurricane Isabel track. Results showed water levels in Washington, Hurricane Isabel (2003) track DC exceeding 17 feet – high enough to top levees protecting the central core of the city. Source: NOAA http://www.nhc.noaa.gov/verification/verify5.shtml Resilience through knowledge [email protected] How do you use it? A storm surge model can be used for multiple purposes: Risk assessment Forecasting and emergency response Damage assessment Stakeholders on the Guangxi typhoon early warning system include: Sun Yat-sen University, Guangxi Province Weather Bureau and Climate Decision, LLC. The system owner, Guangxi Province Weather Bureau, is located in Nanning and is currently using the system for risk assessment. Resilience through knowledge [email protected] How do you run a storm surge model? Run model . ~2 hours Output: water levels (meters above mean sea level) Track files are available from authorities including China (CMA), Japan (JMA), EU (ECMWF), United States Input: storm track file (Joint Typhoon Warning Center) and vendors such as Kinanco. 1 Mujigae2015_run01 2 Date_Time(GMT) Center_Lat Center_Lon Max_Wind_Speed Min_Pressure Radius_Max_Wind 3 yyyymmddHH degrees_N degrees_E m/s mb km 4 China 5 2015100106 14.4 124.0 15.4 1000 83.3 6 2015100112 15.2 122.7 18.0 996 83.3 7 2015100118 15.5 121.4 15.4 1000 64.8 8 . Resilience through knowledge [email protected] Design Challenge: Data Challenge Solution Data required to build a storm surge Global open data: model: GEBCO (UK) bathymetry Bathymetry SRTM (US) digital elevation model Digital elevation model NGA (US) coastline Coastline Water level (tide gauge) We used the best global open data available and spent considerable effort on improving In China, as in many countries, these the data quality and fit. We supplemented it datasets are considered sensitive and are with research provided by our university generally not made publically available. partner, e.g., maximum water level reports from recent storms. A virtue of this approach is that it can be applied to any coastal area in the world. Resilience through knowledge [email protected] Design Challenge: Run time Challenge Solution A good storm surge model is both Optimize design to focus on the accurate and fast. Guangxi coast and estuaries. The Guangxi model grid has 60,000 nodes with resolution varying from 50 km at the ocean boundary to as high as 300 meters at the coastline. This design allows the model to run on a Linux workstation in less than 2 hours. It will efficiently run a single forecast for an approaching storm or tens of thousands of simulations from an event catalog. Resilience through knowledge [email protected] Challenge: Typhoon Mujigae Challenge Today is October 2, 2015. Typhoon Mujigae GUANGXI is projected to make landfall on October 4, GUANGDONG 2015. We need three decision makers: Manager shipping company Power grid operations chief University facility operations director HAINAN Philippines Mujigae October 1 track (Kinanco) Mujigae October 2 track (Kinanco) with past, current and forecast 6-hour positions Resilience through knowledge [email protected] Challenge: Marine shipping Shipping company manager As manager of a shipping company located GUANGXI in Beihai you have to decide whether to GUANGDONG suspend marine operations on October 3-4 between the ports of Beihai and Hong Hong Kong Kong. Beihai HAINAN Philippines Mujigae October 1 track (Kinanco) Mujigae October 2 track (Kinanco) with past, current and forecast 6-hour positions Resilience through knowledge [email protected] Challenge: Power grid operations GUANGXI Guangxi Power grid manager GUANGDONG Roads are likely to be blocked by debris or flooding after Mujigae makes landfall. As operations chief for Guangxi Power Grid you have to decide to which of these cities you will preposition resources that will Qinzhou Yangjiang support restoration efforts. You only have Tieshangang enough time to get trucks to two locations. Zhanjiang Tieshangang Qinzhou Zhanjiang Yangjiang HAINAN Mujigae October 1 track (Kinanco) Mujigae October 2 track (Kinanco) with past, current and forecast 6-hour positions Resilience through knowledge [email protected] Typhoon early warning system: Mujigae (wave) Typhoon early warning system simulation of TS Mujigae showing significant wave height (meters). Resilience through knowledge [email protected] Typhoon early warning system: Mujigae (maximum storm surge) GUANGXI GUANGDONG Qinzhou Yangjiang Simulation results for TS Mujigae showing Tieshangang maximum storm tide (meters above mean sea Zhanjiang level). HAINAN Resilience through knowledge [email protected] Typhoon Mujigae forecast tracks Forecast tracks for Typhoon Mujigae were GUANGXI quite accurate. GUANGDONG Landfall occurred within 30 miles of the 48-hour forecast. HAINAN Mujigae October 1 track (Kinanco) Mujigae October 2 track (Kinanco) Mujigae October 3 track (Kinanco) Mujigae October 4 track (Kinanco) with past, current and forecast 6-hour positions Resilience through knowledge [email protected] Typhoon Mujigae Impacts 2015年10月04日，湛江市处于台风中心，最大达到十五级大风。 10月5日8时，广西电网10千伏及以上线路跳闸579条次，故障停运变电 上午一切水上旅游全部停止，台风势力范围一切航班全部取消。 站9座，停电影响居民户数105.8万户。停电的区域主要集中在玉林的博 台风登陆时放鸡岛多名游客被困。 白、陆川，北海的铁山港、合浦山口、公馆、白沙镇、钦州的郊区和浦 北、灵山县，以及南宁的武鸣、横县等地。广西电网有399支队伍6000 余人、400余台发电设备投入停电抢修复电，截至5日上午8时，已有 October 4, 2015, Zhanjiang City (Guangdong) was 20.9万户因灾停电的居民恢复供电。由于台风“彩虹”对广西沿海地区 in the center of the typhoon, maximum winds 的影响减弱，5日7时开始，原计划安排停运或更改区段运行的进出广西 沿海地区14趟动车恢复正常通行，车票同步正常发售。 reached the 15th level. All marine tourism had stopped; all flights have been cancelled . At 0800 on October 5, Guangxi Power Grid’s 10 kV or higher powerlines had tripped more than 579 times, and 9 substation experienced outage, affecting 1.058 million households. Blackout areas mainly 2015年10月6日15时，广东民政厅通报称，“彩虹”造成广东湛江等9市 concentrated in Yulin Bobai, Lu Chuan, Tieshangang, 42个县不同程度受灾，累计受灾人口353.4万人，因灾遇难者升至18人， Hepu, Gongguan, Baisha and Qinzhou . 4人失踪，紧急转移安置17.04万人，农作物受灾面积28.27万公顷，倒 塌房屋3374间，直接经济损失232.4亿元。 At 15:00 on October 6 2015, the Guangdong Civil October 5, 2015, Guangdong Ocean University in Affairs Department announced that Typhoon Mujigae Zhanjiang city suffered heavy losses. Many trees had impacted Zhanjiang, 8 other cities, 42 counties were uprooted and are blocking roads. All glass at varying degrees, affected a total population of 3.53 doors in the university’s Marine Life Museum have million people; 18 people lost their lives and 4 people been broken. are missing . China Southern Power Grid has sent workers from neighboring areas to Zhanjiang, but restoration of the power supply will take longer time due to damage to the local grid. Resilience through knowledge [email protected] Typhoon Mujigae Impacts Even with an accurate forecast emergency responders face a steep challenge – especially when changes occur within 24 hours before landfall. Packing winds up to 60 meters per second, the typhoon landed in Zhanjiang, Guangdong at 2:10 p.m. Sunday. "Mujigae is a super-fast attacker that has not been seen in decades. At least I have not seen in the last 30 years as a forecaster," said Lin Liangxun, chief expert at Guangdong provincial meteorological station. "From its formation to landing, the typhoon traveled 800 miles in 57 hours, while most other typhoons land in Guangdong three to four days after formation," said Lin. Resilience through knowledge [email protected] Conclusion More information at: http://climatedecision.net/ Huge waves dwarfed six-storey buildings as Typhoon Chan-hom approached Wenling in Zhejiang province. (AFP) Source: http://www.abc.net.au/news/2015-07-12/extensive-damage-from-typhoon-chan-hom-reported-in-eastern-china/6613770 Resilience through knowledge [email protected].
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