中文摘要：

在 1999 跟随时式的地震(ML=7.3 ) ，沉积相关的灾难例如山崩和碎片流动，在台湾变得更经常。因为工程结构不能是充分并且很快 emplaced，政府开始了非结构的危险缓解程序。开始，社区碎片流动撤退练习在 2000 被支持。在 2001 年 7 月引起众多的碎片流动事件的台风 Toraji，和一些社区根据练习撤离了，显著地减少可能的伤亡的数字。基于那结果，政府为撤退练习扩展了程序。第二，在时式的地震以后创造的早警告系统将阻止许多潜在的未来伤亡。为在不同区域的碎片流动警告的降雨阀值价值从从本地气象站收到并且为本地 geomorphologic 状况修改了的信息被决定。实时信息逐渐地正在是综合的创造一个碎片流动灾难警告系统，其目标是提供警告给碎片流动是可能的在地区。警告系统在 2005 被发射并且有闹钟的二个层次：黄、红。最后的、红警报扳机强制了撤退。总的来说，在时式的地震不是在数字的减少的结果或沉积的严厉联系灾难以后，在从碎片的伤亡的减少在十年期间流动，但是与逐渐地改进的早警告和撤退系统有关直接是更多。然而，从台风 Morakot 导致 2009 的复合危险提醒我们对改进存在缓解系统的进行中的需要。

英文摘要：

Following the Chichi Earthquake （ML=7.3） in 1999, sediment-related disasters, such as landslides and debris flows, have become more frequent in Taiwan. Because engineering structures cannot be fully and rapidly emplaeed, the government has initiated non-structural hazard mitigation programs. Initially, community debris flow evacuation drills were promoted in 2000. Typhoon Toraji caused numerous debris flow events in July 2001, and some communities evacuated according to the drills, significantly reducing the numbers of possible casualties. Based on that result, the government expanded the program for evacuation drills. Secondly, the early warning system created after the Chichi Earthquake will prevent many potential future casualties. Rainfall threshold values for debris flow warnings in different areas are determined from information received from local weather stations and modified for local geomorphologic situations. Real- time information is gradually being integrated to create a debris flow disaster warning system, the goal of which is to provide warnings to zones in which debris flows are likely. The warning system was launched in 2005 and has two levels of alarms： yellow and red. The final, red alarm triggers enforced evacuation. Overall, the decrease in casualties from debris flows during the decade after the Chichi Earthquake is not the result of a decrease in number or severity of sediment related disasters, but is more directly related to the gradually improved early warning and evacuation system. However, the compound hazards resulting from Typhoon Morakotin 2009 remind us of the ongoing need for improving the existing mitigation system.