Landscape Planning of the Flood-prone Areas in Extreme Climate -A Case Study of Dongshan River Basin in Yilan County

• Main Authors: WANG,YU-SHI, 王宇石
• Other Authors: HUANG,YI-YU
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/ejrvn2

碩士 === 東海大學 === 景觀學系 === 107 === Recently, the global extreme climate has become an irreversible trend. The sea level rises, the rainfall intensity increases, and the scale of the typhoon increases. The disasters are becoming more and more serious. Among them, the flooding problem is the most one. Especially for the "Flood-prone Areas ", the probability of flooding and the frequency increase. Water helps people not to live，produce and appreciate, but to be a disaster. To face and slow down such trends, it is necessary to fully understand the natural, human and landscape environment of the base, and analyze the causes of flooding to come up with a response strategy. Taking the Dongshan River Basin as an example, it has always been a typical base in flood-prone areas. Under the trend of extreme weather, the flooding problem that has been temporarily relieved by intercepting straight and constructing dikes has begun to stand out. Re-examine the causes of flooding, divided into two categories, natural and artificial. Natural factors include: increased rainfall intensity, increased typhoon and heavy rain, upstream silt deposition, high groundwater level, sea level rise at the estuary, etc. The artificial factors include: the increase in land use area, the increase in impervious pavement, the straightening of the cut, the destruction of the original environment, and the construction of buildings and production in flood-prone areas. Based on the above analysis, this plan transforms traditional ideas and uses the theory of “sponge city” and “landscape ecology”. Organize the patches in the Dongshan River Basin, repair the functions of the river corridors, add new artificial wetlands as a link between the nodes and the rivers, and construct a network-like “water resources plan”. It regulates water structure in space and time, reducing flood risk. At the same time, it traces the wisdom of the ancients and develops a "farm and production model" suitable for "Yilan". It restores the memory and history of the people on the ground in response to the flood. Finally, by finding the right location to handle the river silt and reuse, it not only increases the water passage area of the river, but also turns waste into treasure, and supports the implementation of the two projects to achieve the relative balance of land resources. To sum up the above, combined with the forces of nature and man-made, transforming the disadvantages as an advantage, and providing reference for the future "Flood-prone Areas" in the face of extreme weather intensification.