河溪生態工法之設計及其高水分析

Design and High Water Level Analysis of River Ecological Engineering Methods

蔡西銘(S. M. Tsai) ； 陳獻(S. Chen) ； 張德鑫(T. H. Chang) ； 黃勝頂(S. T. Huang)

《中原學報》 33卷3期 (2005/09) Pp. 479-494

https://doi.org/10.6358/JCYU.200509.0479

摘要

在河川治理上，為了維護與創造河溪生態的生物多樣性空間，近年來政府大力推動生態工法。而台灣河川大多是既短且陡的特殊地形，且因歷年經常遭受颱風侵襲，許多平時低流量之河溪，經過暴雨後常造成下游地區嚴重淹水，造成了許多不可預期的傷害，因此本文從防洪的角度切入，探討當河溪治理採用自然或半自然之工程技術，如何來檢討生態工法在維護「安全」上的能力。本研究以台中地區筏子溪為案例提出相關生態工法規劃設計，並以美國水文研究中心所發展的河川分析系統(HEC-RAS)進行高水分析，比較規劃設計前後對河川水位之影響。模擬結果顯現以生態工法所設計之多孔隙自然護坡與光滑混凝土護岸之比較，生態工法者會造成河川水流流速變慢但水位提高。故河川用地上比一般混凝土平面護岸者要來得寬。

關鍵字

河溪生態工法 ； 高水分析 ； 水文分析系統

並列摘要

Formosa Taiwan is a place with diverse natural resources, and it also nurtures the creation and supplies the habitats for breeding and feeding in the river region. In order to maintain and create the biodiversity around the water environment, ”River Ecological Engineering Methods” are gradually considered in harnessing, utilizing and approaching the river region. The design and plan with River Ecological Engineering Method at Fa-Tzu River in Tai-Chung area is selected as simulated example. The River Analysis System developed by the Hydrologic Engineering Center (HEC-RAS) in America is performed one-dimensional steady flow hydraulics. Therefore, the high water level analyses those are compared before and after the design in Fa-Tzu River prove the ability of conveyance by the system HEC-RAS. As a result of the initial achievements about the cross section design and high water level analysis, the study aims at offing the suggestions to the application in harnessing the river by the plan with the Ecological Engineering Method.

並列關鍵字

River Ecological Engineering Methods ； High water level analysis ； HEC-RAS