Application of HEC-RAS to Hydraulic Analysis– A Case Study of Agongdian River

• Main Authors: Chang Shu Wei, 張書偉
• Other Authors: 曾文哲
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/33539365366441047194

碩士 === 正修科技大學 === 營建工程研究所 === 100 === The rapid industrial development of the world in 21st century has caused emission of a large number of gases, such as carbon dioxide, thus resulting in drastic depletion of ozone layer in the stratosphere.The subsequent occurrence of greenhouse effect leads to fast melting of glaciers in Arctic, which makes sea level rise year by year. In such a crisis of global warming, Taiwan is even an area belonging to “high risk group.” When there is overall rise of sea level in future, impacts will be caused to Linbian of Pingtung, Dongshi of Chiayi, Donggang and Lanyang Plain, and all these coastal areas may be submerged under seawater.Under the impacts caused by such environmental change, how we march to a sustainable and safe future will be a great issue that all the people of Taiwan have to face together. With steep topography, Taiwan area has concentrated rainfall, and is attacked by strong typhoons for several times every year. In recent years, due to greenhouse effect and global warming, the frequency of torrential rain is increased and concentrated continuously, leading to frequent occurrence of disasters and great loss of properties amounting to over tens of billions of dollars per year in average. Based on the greater severity of flooding disaster, it is necessary to make reasonable hydraulic analysis and planning; otherwise, any disaster prevention or flood control project causes not only a waste of money, but also more serious threats to the lives and properties of people.As a result, the promotion of infrastructure construction of Taiwan may even be affected. In fact HEC-RAS can be applied to a rather extensive scope in hydraulic analysis, such as floating channel realignment, hydraulic force analysis of river course, hydraulic simulation, flood prediction, reservoir management and planning, all of them achieving quite excellent results. In view of this, the paper employs HEC-RAS to carry out hydraulic algorithm. Besides, taking Agongdian River for example, the paper explores and analyzes the hydraulic properties of the river, and gives suggestions for flood control and disaster prevention of the river in order to achieve the goal of safe realignment of floating channel. Furthermore, these suggestions can be provided to relevant departments as a reference for making floating channel realignment in future, and for achieving the effect of inducing others to actively offer more valuable contributions.