A Study on the Damages and Countermeasures at a Specific Highway Section Due to Typhoon Morakot

• Main Authors: Pan Sung-Bin, 潘祥斌
• Other Authors: Dr. Kerh Tienfuan
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/53599891746682222005

碩士 === 國立屏東科技大學 === 土木工程系所 === 102 === On 8th August of 2009, carrying extreme torrential rain within a short period of time, the landfall of Typhoon Morakot caused severe floods and mudslides at central, south and southeast of Taiwan with consequent severe damages to many sections of highways at remote mountain area. This is the worst catastrophic storm experienced since the severe flood caused by Typhoon Ellen on 7th August of 1959. Tai-20 highway provides major connection with outside world for the remote Cinhe~Fuxing section of Taoyuan District, Kaohsiung city. Due to the extreme torrential rain, flush flood at Laonong Creek carrying huge amount of mud from mudslides within its tributary and Butangbunasi creek caused serious damaged to this section of highway resulting complete covered up of the Cinheming tunnel by mudslide. Many sections of Tai-20 highway and bridges were flushed away by floods. Investigations were conducted recently from March to June of 2012 for bridge column conditions of bridged within this section of Laonong creek including Salaahwu Bridge. The results showing that the stratum of the creek elevated again, and the Fuxing Bridge located in Fuxing tribal community was nearly buried by depositions. These evidence showing that the stratum at upstream as well as at downstream of Taoyuan section of Laonong Creek and its estuary are unstable. Currently only minimal transportation functions are sustained via temporary road constructed within riverbed and temporary steel bridges. This study is to explore fundamental causes of these types of catastrophic damages to this section of the highway (Tai20 highway 95k-103k) in order to establish countermeasure strategies in consideration of watershed management, transportation strategy for flood and non-flood seasons etc. and long-term rehabilitation strategies to reach the ultimate goal of all time safe highway system. The phenomenon of flow path changes caused by deposition eventually become a serious threat to properties and lives of villages along the river banks is discovered and it is to anticipate the results from this study will benefit protection of the highway and residents at vicinity.