| Summary: | 碩士 === 中華大學 === 土木工程學系碩士班 === 101 === In Taiwan, the impact of climate change has become increasingly severe in recent years. The result is no longer a single-aspect disaster, but a multifaceted catastrophe with consequences in livelihoods and economics, politics, and social stability of the entire nation. Among them, the incident of torrential rainfall is responsible for most large-scaled washout disasters in mountain areas. The natural environment of Taiwan is extremely complicated. With numerous constructions constantly in progress, the natural rivers and mountains as well as manmade roads and bridges are continually changing, formulating a delicate dynamic balance. Failing to maintain this dynamic balance will inevitably put the safety of the people and the development of our nation at risk. Therefore, disaster prevention should be addressed with a throughout and comprehensive scheme. By recognizing the cause-and-effect chain in these disasters, identifying disaster-causing factor, and determining the key factors leading to breakage of the chain, we shall develop a strategy that best fits our local conditions, thus fulfill the goal of a permanent disaster management.
Several historic torrential rainfall events are investigated in this study. Cases about the damage of mountain roads and related facilities are collected. Format of destruction and the cause of disasters are examined. Finally, recommendations for project planning and construction design are proposed, in accordance to the unique natural environment, to pursue the sustainability of our land. Our results show that a throughout consideration should be given at the early stage of the construction planning by evaluating the dynamic effects on future environment, in order to determine the best resolution. Our analyses also indicate that the destructions of roads were most severe in subgrades and retaining walls. Furthermore, bridges should be long spanned with minimum piers, and river dikes should allow for overflow of flooding so as to minimize the risk of dike’s breaching.
Our current study presents the ideas of “co-management of mountains, rivers and roads” as well as the “disaster chain.” It is hoped that these concepts will be enforced at the planning and designing stage of future constructions. Though construction at the early stage may trigger different degrees of negative impacts on the stability of our mountains and rivers, a long-term concordance between constructions and environment sustainability can still be achieved with proper engineering practices.
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