| Summary: | 碩士 === 國立臺北大學 === 都市計劃研究所 === 93 === Urban development is closely related to river. Take Tansui River Basin for example, in early Ching Dynasty, due to the fertile soils along Tahan Creek, Yingge and Shulin had developed into agricultural settlements. Hsinchuang and Meng-chia were known for their water transport due to the location near the river. As the riverbed of Tansui River gradually filled by sedimentation, Da Dao Cheng replaced Meng-chia and became major commerce center. Currently, due to the abundant water resources, as well as the flat topography of Taipei Basin, Tansui River Basin has become the most populated area in Taiwan. Therefore, the development of levee, reservoir, and sewage treatment plant has resulted in severe urban development. It is observed that the inter-relationships and function between urban area and river have changed over times. Thus, the interaction and interrelationship between Tansui River and urban development in Taipei should be investigated to understand how the energy flows of Tansui River, Hsin-Tien Creek, Tahan Creek, and Keelung River distribute spatially and contributed to the urban development, and to study the effects of urban development on rivers.
Since the city and river have different geographic context, and the natural system of the rivers is difficult to quantify, a common energyl unit “emergy” is applied to discuss the interactive relationship between the urban development and natural environment. Therefore, this study discussed the functions that rivers contributed to the city, the effect of urban development on the river, and the interactive relationship between the city and the river; applied ecological energetic analysis to develop four subsystems; discussed the types and transformations of the energy flow of four subsystems -Tahan Creek, Hsin-Tien Creek, Keelung River, and Tansui River, using emergy synthesis, in order to understand the reciprocal relationships between Tansui River and its urban development.
The results of this research are as follows：(1) The natural process of the river: the energy of Tansui River Basin varies in time, and distributed differently from upstream to downstream urban area. Downstream Tansui River ranked highest in river emergy and river sand transport. (2) Emergy concentration: the concentration of emergy use is affected by the input from urban economic system to the river management, which is correlated to population density and economic activities. It is higher in downstream because more emergy is invested on the construction of levees. (3) Sewage treatment: urbanized area on downstream area, especially along Keelung River, has better sewage treatment. (4) EYR and ESI: Keelung River has the lowest EYR and ESI. The overall ranking is Tansui River > Hsin-Tien Creek > Tahan Creek; but as time changes, the downstream of Tansui River has declined significantly; due to the damages from rapid urban development and more investment the construction of levees and resulted in the decrease of environment sustainability. In order to enhance the sustainability of river and city, it is necessary to recognize the importance of symbiosis between city and river.
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