台灣沖積河川廊道界定手法初探

Planning the Extent of Fluvial Corridors in Taiwan

10.29417/JCSWC.202012_51(4).0004

楊佳寧(Chia-Ning Yang)；郭鎮維(Cheng-Wei Kuo)

河川廊道 ； 河相學 ； 河川治理規劃 ； Fluvial corridor ； fluvial morphology ； river planning

中華水土保持學報

51卷4期（2020 / 12 / 01）

159 - 168

繁體中文

面臨極端氣候，歐美各國紛紛提出以河川自然沖淤作用所需的廊道空間，作為河川管理依據。本研究參考各國作法，應用河相學原理，發展一套適用於台灣之河川廊道界定方法，使用歷史廊道範圍、未來變動範圍、主要堆積範圍及溢淹範圍等四條界線界定河川廊道，並進一步將廊道分成侵蝕作用區、堆積作用區與溢淹區，作為後續管理的參據。本文以烏溪埔里盆地及曾文溪二溪河段為例，界定河川廊道，並提出未來順應河相之改善方向。研究成果期可應用至河川治理與國土規劃，使河溪能在最少量工程介入下，兼顧河防安全與環境生態等多重價值。

In response to the challenges of extreme climatic conditions, various countries have used fluvial geomorphology to determine the extent of fluvial corridors, areas where a river is allowed to move freely and display its processes of sedimentation and erosion. This study proposed a procedure for demarcating Taiwan's fluvial corridors. Four boundaries mapping area of historical channels, area of potential occupation, area prone to deposition, and area prone to inundation are used to determine the extent of fluvial corridors. The corridors can then be subdivided into zones of erosion, deposition, and inundation for management purposes. The Wu River and the Zengwen River were used as examples for determining the extent of fluvial corridors and suggestions were made to improve their flood-control measures. The recommended procedure of mapping and subdividing fluvial corridors can be used in flood control planning to allow river adequate space for energy dissipation, minimize cost on flood-control works, while enabling the river to provide its valuable eco-system services.

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