植生渠道水理性質之研究

Study on the hydraulic properties of vegetation channels

洪偉哲(Wei-Che Hung)

指導教授 ： 邱金火

中原大學/工學院/土木工程學系/碩士(2006年)

https://doi.org/10.6840/cycu200600592

摘要

近年來，生態與環保意識的抬頭，各項工程均以生態工程為理念，常採用表面粗糙、孔隙透水或植生的護岸，多樣性組合之水路以符合水域之生態性。本研究以生態渠道為題，考慮渠床粗糙和護岸植生或野草入侵下，探討渠道的阻力係數。進行植生護岸和粗糙渠床之渠槽試驗，以三種人造草皮分別模擬渠道護岸植生，分析渠道在不同植物種類之水理特性。試驗數據分析時，將渠床斷面視為渠床面積和護岸面積等兩部份，分別估算渠床和護岸的曼寧係數，推估生態渠道之綜合曼寧係數。經由分離法計算阻力係數顯示，渠道側岸之曼寧n值大於渠道綜合n值。在常態流況下，渠道側岸nw值大小為帶花長草＞長草＞短草，帶花長草側岸n值逐漸趨近0.0675，長草側岸n值逐漸趨近0.0525，短草側岸n值逐漸趨近0.044。此研究成果可解決不同型式渠床和護岸之曼寧係數推估需多次水工試驗的問題。

關鍵字

多樣性生態渠道 ； 植生護岸 ； 水工試驗 ； 曼寧係數 ； 生態工法

並列摘要

Recently, the ecological environment and environmental protection consciousness are gradually taken by the populace. Ecological engineering method is a major trend in engineering methods nowadays. In irrigation engineering, a revetment with coarse surface, permeable pores, or vegetation, and their diverse combination channel are often adopted to fit to the ecology for the water ways. This research concerned with the ecological diversity channel. One considered the channel resistance coefficients under the circumstance with coarse channel bed, vegetation revetment, or weeds invasion, and did the according hydraulic model test. One separately simulated the vegetation revetment channel by three kind of artificial sod. One also analyzed the water characteristic and security of the channel with different kinds and height of vegetation. While analyzing the data, one first separated the influence on the coarse coefficients of the channel bed and revetment, and estimated their Manning coefficients separately. Next, the composite Manning coefficient was evaluated for the ecological channel. The results showed that the Manning coefficients of channel revetment are greater than those of whole channel cross-section. Under the normal flow conditions, the experimental results also showed that the Manning coefficients are long grass with flowers＞long grass＞short grass. Manning coefficients of channel revetment of long grass with flowers converge gradually to the value 0.0675；long grass converges gradually to that of 0.0525；short grass converges gradually to that of 0.044. The results in this research can solve tedious experimental problems on estimation of Manning coefficients for different types of channel beds and revetments.

並列關鍵字

Ecological engineering method ； Ecological diversity channel ； Manning coefficient ； Vegetation revetment ； Hydraulic model test

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