廖晧宇潘宗毅譚義績賴進松蘇明道2020-03-052020-03-052018https://scholars.lib.ntu.edu.tw/handle/123456789/470091Taiwan located in Southeast Asia faces strong monsoon and three to four typhoons annually which may cause floods and may result in great damage as well as loss of property. The Water Resource Agency (WRA) has established a warning system as a non-structural measure. The concept of the warning system is based on rainfall threshold. When the cumulative rainfall reaches or exceeds rainfall threshold, the warning system will alert emergency response personnel. According to flood records provided by WRA between 2013 and 2015, the records of flood alarm showed that the warning accuracy of warning system needs to be improved. This study provides a methodology to build effective rainfall thresholds through the tabu search which optimizes rainfall thresholds based on 1、3、6、12 and 24 hour duration at the same time. The cases of study are in the Wenshan and Xindian district. And the rainfall events are divided into four situations, including correct alert (A), missed alert (B), false alert (C) and correct rejection (D). The results show that the rainfall thresholds of study have more alerting ability than official rainfall thresholds. The increasing maximum of accuracy is 40%, the increasing maximum of hitting flood during flooding time is 33.3%, and the increasing maximum of hitting flood during warning time is 5.7%. ? 2018, Taiwan Agricultural Engineers Society. All rights reserved.Cumulative rainfall; Flood disaster events; Inter-event time definition; Rainfall threshold; Tabu searchFloods; Tabu search; Water resources; Cumulative rainfall; Effective rainfall; Emergency response personnels; Flood disaster; Inter-event time definition; Rainfall event; Rainfall thresholds; Southeast Asia; Rain; flood; flood damage; flooding; methodology; natural disaster; rainfall; threshold; typhoon; warning system; China; Shanxi; Taipei; Taiwan; Wenshan; Xinding Basin; Yunnanjournal article10.29974/JTAE.201803_64