Abstract
The Erchung Floodway, one of the successful measures of the Taipei Flood Prevention System, was constructed to mitigate the Tanshui River floods in the Taipei metropolitan area. The Taipei metropolitan area is the most crowded region in Taiwan. More than one-third of the total population of the country resides in this area. However, its function has changed due to urban development and natural alterations over time. The main concerns of this study are to investigate the current diversion capacity and the current vulnerability of the Taipei Flood Prevention System in accordance with influential environmental factors, including anthropogenic effects and climate change threats. Thirty-two scenarios were established for sensitivity analysis using HEC-RAS model. The results indicate that the capacity of the Erchung Floodway diversion has noticeably decreased from 9,200 to 6,300 m3/s under a 200-year recurrence flood. Three vulnerable locations have been identified: Shihtzutou, Shezi, and Wugu. It was also found that the Taipei Flood Prevention System will encounter challenges if the roughness of the riverbed within the Erchung Floodway increases by over 50 %, the roughness of the riverbed within the Tanshui River increases by over 25 %, the water stage at the river mouth rises to 5.03 m, or the 200-year recurrence flood increases to 28,300 m3/s. Two proposed cost-effective mitigation strategies in the present study are: (1) to remain or decrease the riverbed elevation and roughness within the Tanshui River (Taipei Bridge section); (2) to decrease the riverbed roughness by at least 25 % within the upstream and midstream of the Erchung Floodway.
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References
Botzen WJW, Bergh van den JCJM, Bouwer LM (2010) Climate change and increased risk for the insurance sector: a global perspective and an assessment for Netherlands. Nat Hazards 52:557–598
Changnon SA (1998) The historical struggle with floods on the Mississippi River basin—impacts of recent floods and lessons for future flood management and policy. Water Int 23(4):263–271
Chen AS, Hsu MH, Tsng WH, Huang CJ, Yeh SH, Lien WY (2006) Establishing the database of inundation potential in Taiwan. Nat Hazards 37:107–132
Chow VT (1959) Open-channel hydraulics. McGraw-Hill, New York
Dang NM, Babel MS, Luong HT (2011) Evaluation of food risk parameters in the day river flood diversion area, Red River Delta, Vietnam. Nat Hazards 56:169–194
Green C (2004) The evaluation of vulnerability to flooding. Disaster Prev Manag 13(4):323–329
Harman J, Bramley ME, Funnell M (2002) Sustainable flood defence in England and Wales. Proc Inst Civil Eng 150:3–9
Hsieh LS, Hsu MH, Li MH (2006) An assessment of structural measures for flood-prone lowlands with high population density along the Keelung River in Taiwan. Nat Hazards 37:133–152
Huang SL, Hsu WL (2003) Materials flow analysis and energy evaluation of Taipei’s urban construction. Landsc Urban Plan 63:61–74
IPCC (2001) Climate change 2001: impacts, adaptation and vulnerability—contribution of working group II to the third assessment report of the intergovernmental panel on climate change. Cambridge University Press, Cambridge
IPCC (2012) Summary for policymakers. In: Field CB, Barros V, Stocker TF, Qin D, Dokken DJ, Ebi KL, Mastrandrea MD, Mach KJ, Plattner GK, Allen SK, Tignor M, Midgley PM (eds) Managing the risks of extreme events and disasters to advance climate change adaptation. A special report of working groups I and II of the intergovernmental panel on climate change. Cambridge University Press, Cambridge, pp 1–19
Klijn F, Van Buuren M, Van Rooij SAM (2004) Flood-risk management strategies for an uncertain future: living with Rhine river floods in the Netherlands. Ambio 33(3):141–147
Kundzewicz ZW, Ulbrich U, Brucher T, Graczyk D, Kruger A, Leckebusch GC, Menzel L, Pinskwar I, Radziejewski M, Szwed M (2005) Summer floods in Central Europe—climate change track? Nat Hazards 36:165–189
Lehner B, Doll P, Alcamo J, Henrichs T, Kaspar F (2006) Estimating the impact of global change on flood and drought risks in Europe: a continental, integrated analysis. Clim Change 75:273–299
Li MH, Yang MJ, Soong R (2005) Simulating typhoon floods with gauge data and mesoscale-modeled rainfall in a mountainous watershed. J Hydrometeorol 6:306–323
Lowe AS (2003) The federal emergency management agency’s multi-hazard flood map modernization and the national map. Photogramm Eng Remote Sens 69(10):1133–1135
Murphy D (2003) Strategy for flood risk management (2003–2008). Environment Agency, UK
Pan TY, Chang LY, Lai JS, Chang HK, Lee CS, Tan YC (2012) Coupling typhoon rainfall forecasting with overland-flow modeling for early warning of inundation. Nat Hazards. doi:10.1007/s11069-011-0061-9
Pappenberger F, Beven K, Horritt M, Blazkova S (2005) Uncertainty in the calibration of effective roughness parameters in HEC-RAS using inundation and downstream level observations. J Hydrol 302:46–69
Rodriguez LB, Cello PA, Vionnet CA, Goodrich D (2008) Fully conservative coupling of HEC-RAS with MODFLOW to simulate stream–aquifer interactions in a drainage basin. J Hydrol 353:129–142
Shi PGY, Yuan Y, Guo W (2005) Integrated risk management of flood disaster in metropolitan areas of China. Water Resour Dev 21(4):613–627
Shih SS, Yang SC, Lee HY, Hwang GW, Hsu YM (2011) Development of a salinity-secondary flow-approach model to predict mangrove spreading. Ecol Eng 37:1174–1183
Tenth River Management Office WRA MOEA (2011) On evaluating the capability for water conveyance of Erchong Floodway (1/2). Water Resources Agency MOEA, Taiwan (in Chinese)
Tenth River Management Office WRA MOEA (2012) On evaluating the capability for water conveyance of Erchong Floodway (2/2). Water Resources Agency MOEA, Taiwan (in Chinese)
US Army Corps of Engineers (2010a) HEC-RAS hydraulic applications guide: version 4.1. Institute for Water Resource, Davis
US Army Corps of Engineers (2010b) HEC-RAS hydraulic user’s manual: version 4.1. Institute for Water Resource, Davis
Water Resources Agency MOEA (1996) Experimental report for hydraulic model of the Tanshui River establishment and Taipei flood prevention performance. Water Resources Agency MOEA, Taiwan (in Chinese)
Water Resources Agency MOEA (2009) Planning of integrated management for the Danshuei River Basin (1/2). Water Resources Agency MOEA, Taiwan (in Chinese)
Water Resources Planning Institute WRA MOEA (2010) Hydrological review of Tanshui River system. Water Resources Planning Institute WRA MOEA, Taiwan (in Chinese)
Woody LC (1956) Estimating hydraulic roughness coefficients. Agric Eng 37(7):473–475
Yang SC, Shih SS, Hwang GW, Adams JB, Lee HY, Chen CP (2013) The salinity gradient influences on the inundation tolerance thresholds of mangrove forests. Ecol Eng 51:59–65
Acknowledgments
We wish to thank the Water Resources Planning Institute WRA MOEA for funding support (2009–2011) and the Tenth River Management Office WRA MOEA for providing the data of riverbed bathymetry and relevant hydrological data. The useful suggestions from two anonymous reviews have been incorporated into the paper.
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Shih, SS., Yang, SC. & Ouyang, HT. Anthropogenic effects and climate change threats on the flood diversion of Erchung Floodway in Tanshui River, northern Taiwan. Nat Hazards 73, 1733–1747 (2014). https://doi.org/10.1007/s11069-014-1166-8
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DOI: https://doi.org/10.1007/s11069-014-1166-8