Collaborative Research on Flood Resilience in Urban Areas (CORFU) Final Workshop Taipei Case Study Taipei, 27 th May 2014

Transcription

1 Collaborative Research on Flood Resilience in Urban Areas (CORFU) Final Workshop Taipei Case Study Taipei, 27 th May 2014 Workshop Agenda 1. Reception of the participants 2. Welcome and introduction 2.1. Workshop introduction - Ming-Hsi Hsu 2.2. The CORFU project - Slobodan Djordjevic 2.3. The CORFU movie 3. Taipei case study within the CORFU project 3.1. WP1-Driver and WP2-Modeling -Tsang-Jung Chang 3.2. WP3- Damage and WP4-Adaptive - Wen-Cheng Liu 4. COFFEE BREAK 5. Barcelona case study - Xavi Llort 6. LUNCH 7. Integrated flood simulation on basin scale and its application in emergency response - Jiun-Huei Jang 8. Early warning system for disaster preparedness using ensemble precipitation system - Tsun-Hua Yang 9. COFFEE BREAK 10. Monitoring and simulation of flood water stage for early warning in the storm-sewer system - Jihn-Sung Lai 11. Inundation forecast system for cities - Chi-Ming Chen 12. Discussions: Wrap-up and conclusions of the workshop - Ming-Hsi Hsu Purpose Date & Venue Participants Attendees Workshop Taipei case study presentation 27 May 2014, Howard Civil Service International House, Taipei, Taiwan, R.O.C Ming-Hsi Hsu (MH) UoE Slobodan Djordevic (SD) National United University Tsang-Jung Chang (TJ) National Taiwan University Wen-Cheng Liu (WC) National United University Xavier Llort (XL) HYDS Jiun-Huei Jang (JH) NCDR Tsun-Hua Yang (TH) TTFRI Jihn-Sung Lai (JS) Hydrotech Research Institute, NTU Chi-Ming Chen (CM) Sinotech Engineering Services, Ltd Please check the list in the annex.

2 Minutes Item Minute Action 1. Reception of the participants 2. Welcome and introduction 2.1 Workshop introduction MH starts his speech welcoming all attenders and remarking the honor of presenting this workshop after four years of hard work. He explains that final results of the project will be presented, going through the methodology that was applied to the case studies in Europe and Asia with the main aim of studying flood events to improve resilience in urban areas. Special attention will be dedicated to Taipei Case Study during the workshop. Finally the meeting agenda is presented. 2.2 The CORFU project SD gives a brief overview about the project, pointing out aspects such as what can be understood by CORFU project, its budget, scope and other general issues. Project aims are listed; among those four can be underlined: Assessment of flood impacts for future scenarios Evaluation of resilience measures and strategies Sharing learning between Europe and Asia Improvement of resilience Also important drivers and their evolution such as population growth and urbanization are mentioned due to their affection to vulnerability and therefore to resilience. The flood impact methodology (direct, indirect, tangible and intangible), development of Flood Damage Assessment Tool to include health impacts and the Flood Resilience Index are explained in a few words by SD. At the end, he remarks that the main objective of the workshop is not only to present results but also to see which of these results will be taken forward and how research will affect policies. Barcelona case study is mentioned because of the great contribution provided to CORFU project. 2.3 The CORFU movie Such movie was created by the École Polytech Nice-Sophia, which director Philippe Gourbesville could not attend the workshop. The film showed the importance of flood management and the catastrophic effects that it is able to cause in poor areas. The video was focused principally on Bangkok (Thailand) and New Jersey (the U.S.) areas. 3. Taipei case study within the CORFU project 3.1 WP1-Driver and WP2-Modeling TJ introduced Taipei case about drivers and urban flood modeling. He talks about the key flood drivers (baseline state, climate change conditions and population structure) and recent flood events bringing serious damage. Among his presentation about drivers, he indicates there are 3 steps to estimate the social vulnerability index (SVI): The factors and weights suggested by experts. Project the factors and weights in the future. Normalize the SVI. After this, he talks about the Mike urban Model to simulate the results of flooded area under the baseline and climate change, and shows some examples of flood

3 maps and compared them. To the end of his presentation, he indicates both A1B and B1 scenarios give more serious flood hazards in Taipei city. Taipei city is facing less population with more elderly people for the next decade, indicating higher SVI values in the future. 3.2 WP3- Damage and WP4-Adaptive WC introduced Taipei case about damage and adaptive. He explained there are two ways to present the impact of flood: Depth-damage curves (DDCs) and inundation depth (hazard) to calculate damage losses for different return period events under baseline and climate change. Quantitative Risk Analysis (QRA) was used to evaluate the flood risk which included social vulnerability index (SVI) and hazard. After that, he talks about adaptation measures resulted from climate change were used including the increase of water storage and reduction of social vulnerability. WC shows the results of direct damage loss and risk maps, and compared them with baseline. He points out the serious risk, due to high value of social vulnerability and hazard. He tells the attenders which two adaptations can actually decrease the residents living in medium- and high-risk regions in CTA. 4. COFFEE BREAK 5. Barcelona case study XL stars his presentation talking about the Barcelona case study within the CORFU project. He tells all attendees the detailed 1D/2D coupled model (analyzed domain, main characteristics and innovations of the model) and shows the results of sewer flow validation, surface flow validation and the video recorded during about the event of 30/07/2011. He points out a specific analysis on the computational time proved that it is possible to carry out simulations in few minutes. This aspect allows to use simulation results for real time strategies and early warning systems. After that, he talks about the Damage Curves have been created for the case study area. He points out the calibration and validation process has lead to a set of curves that are able to accurately represent the damages of the area. He also explains the Damage Curves have been used to assess the impact of different adaptation strategies. To the end of this presentation, he introduces the real-time Early Warning System (EWS) for urban flood alert which based on radar precipitation estimates and Nowcasting has been developed. The EWS allows linking the realtime information with off-line hazard maps, damage curves, etc. 6. LUNCH 7. Integrated flood simulation on basin scale and its application in emergency response JH tells attendees Central Emergency Operation Center (CEOC) integrates central government s departments associated with disaster prevention, mitigation, and response. He also introduces National Science and Technology Center for Disaster Reduction (NCDR) is assigned to chair the information analysis group. JH explains the Rainfall Threshold Model: To meet the need for timeliness and effectiveness in delivering warning information, rainfall threshold method is the most commonly used approach for preliminary flood forecast. Rainfall threshold is the cumulative rainfall depth for a given time period

4 and soil condition that generates critical runoffs. After that, he shows the model calibration and validation, then points out the uncertainty between theory and reality come from Simplification of mathematical formulation. Diversity of computer hardware Inaccuracy of rainfall estimate Warning message translation Lack of social / economic considerations JH explains the components in flood risk analysis is related with probability and consequence for quantify the uncertainty, and could expected flood risk at village level. He also shows the Flood Risk Forecast On-line including rainfall, flood probability, population impact and town impact. To the end of his presentation, he tells attendees Disaster emergency response is like a war that from The Art of War, Sun Tzu, 515 B.C. As water retains no constant shape, so in warfare there are no constant conditions. Rely not on the likelihood of the enemy's not coming, but on our own readiness to receive him. 8. Early warning system for disaster preparedness using ensemble precipitation system TH talks about the early warning system for disaster preparedness in Taiwan, and he tells attenders not only working with WRA s existing warning system but also implementing measures in advance to win the fight against floods. He mentions the warning, alarm and response were in the condition of disaster preparedness and necessary evacuation. After that, he says they doing differently about Integrating TAPEX with 72 hours. Developing a flood warning system considering local characteristics. TH explains the 72 hours is long enough or not. TH says the systems only considering river stage do not satisfy our needs and points out the insufficient drainage inside our levees causes flooding in Taiwan. To the end of his presentation, he advocates Hope for the best but be prepared for the worst with 72 hours. 9. COFFEE BREAK 10. Monitoring and simulation of flood water stage for early warning in the stormsewer system JS talks about manage the flooding problems during heavy rainstorms through computer solutions for many storm-sewer simulation models in the world. This includes building computer models for the drainage or sewer system, such as MOUSE, InfoWorks and SWMM. He mentions the calibration and verification are the processes of modifying the input parameters to a drainage model until the output from the model matches observed set of data. The record and survey data, include: Water stage of the drainage system Inundation depth Inundation zone Inundation duration JS tells attendees there have uniform and non-uniform rainfall distribution data of typhoon events that were used for model calibration and verification. After that, he explains the Warning water stage is defined and related to the

5 rising rate of water stage and the time of evacuation (Lead time). In his presentation, consider the historical inundation data in storm to find the critical manhole for calculating the rising rate of water stage. 11. Inundation forecast system for cities CM starts his presentation talking about the Sino-Topo Model, the flood simulation has the ability to respond the mechanism of cross-flowing between ground water and overland is recommended. Also explains that model is same as with the SWMM, and the backwater computation. To investigate and analyze the basic information of hydrology, physiography, society, economy, public facilities, and inundation. After that, he introduces the forecasting system in Jhuoshuei River Watershed. He mentions the advantages of system about disaster prevention and river regulation. He explains the contents of system and the data applications telemeter and communicate subsystem. CM tell the attenders the forecasting and early warning for flood about To estimate rainfall intensity, river fluid or river level To procedure for announcing early warning To announce by program and equipments To browse hydrologic information on internet or cell phone To the end of his presentation, he says the control and management of system was completed the planning in He also says the design and construction of the software, hardware and hydrologic system model were completed in Discussions: Wrap-up and conclusions of the workshop MH thanks all attenders attend the CORFU Taipei case study workshop. He hoped the flood control planning within Taipei case could provide to Taipei City Government to refer. Annex List of attendees Nº Surname Name Organization 1 Chang Ling-Hsin National United University 2 Chang Tsang-Jung 3 Chen Albert University of Exeter 4 Chen Chi-Ming Sinotech Engineering Services, Ltd 5 Chen Chih-Hung 6 Chen Kuan-Wen 7 Chen Ming-Jen Hydrotech Research Institute, National Taiwan University

6 8 Chen Po-Han 9 Djordjevic Slobodan University of Exeter 10 Doong Dong-Jiing 11 Hammond Michael University of Exeter 12 Hsu Ling-Chen Architecture and Building Research Institute, Ministry of The Interior Department of Marine Environmental Informatics, National Taiwan Ocean University 13 Hsu Ming-Hsi National United University 14 Hsu Tzu-Yao 15 Hu Fang-Yu 16 Huang Chen-Jia 17 Huang Chieh-Li 18 Huang Chin-Yu 19 Jang Jiun-Huei 20 Lai Jihn-Sung 21 Liu Wen-Cheng 22 Llort Xavier HYDS 23 Sánchez-Diezma Rafael HYDS 24 Tan Yih-Chi 25 Tsai Cho-Fang 26 Wang Chia-Huo 27 Wang Wey Hydraulic Engineering Office, Public Works Department, Taipei City Government National Science and Technology Center for Disaster Reduction, NCDR Hydrotech Research Institute, National Taiwan University Department of Civil and Disaster Prevention Engineering, National United University Hydrotech Research Institute, National Taiwan University Architecture and Building Research Institute, Ministry of The Interior 28 Wang Yu-Chi Taiwan Typhoon and Flood Research Institute, TTFRI 29 Yang Sheng-Chi Taiwan Typhoon and Flood Research Institute, TTFRI 30 Yang Tsun-Hua Taiwan Typhoon and Flood Research Institute, TTFRI

7 Photos of CORFU Taipei case study workshop All attenders Ming-Hsi Hsu

8 Slobodan Djordjevic Tsang-Jung Chang

9 Coffee Break Coffee Break

10 Wen-Cheng Liu Xavier Llort

11 Jiun-Huei Jang Tsun-Hua Yang

12 Jihn-Sung Lai Chi-Ming Chen