高滩地植生配置对河川洪流之试验分析-中华水土保持学会.PDFVIP

中華水土保持學報, 46(3): 181-188 (2015) 181 Journal of Chinese Soil and Water Conservation, 46 (3): 181-188 (2015) 高灘地植生配置對河川洪流之實驗分析 * 李津甫 王順昌 陳樹群 摘 要 河道植生雖有阻塞河道水流，抬高洪水位並造成下游淘刷的負面現象；卻亦有護堤固灘，減緩流速， 促使深槽穩定的正面效果。因此本研究以單邊植生及單邊間隔植生之設計，分析植生對水流之阻礙束縮效應， 並採用 3 種不同流量來模擬不同植生覆蓋情況對水流之影響。研究結果顯示，採用單邊間隔植生，可較有效 的達到減緩流速、穩定深槽 (導流) 、保護下游裸露淤地、節省經費等效果。 關鍵詞：灘地植生、流場、單邊間隔植生。 Experimental Analysis of the Flow Field Influenced by Plant Distribution on the Floodplain * Jin-Fu Li Shun-Chang Wang Su-Chin Chen ABSTRACT The plant distribution on the floodplain can induce negative phenomena, such as blocking river flow, raising flood level, and scouring of the riverbed downstream of the plant region. However, if we construct effi- ciently plant distribution on the floodplain, it can also protect the dike, reduce flood velocity, and increase the stabil- ity of the channel. Therefore, we designed the unilateral plant and unilateral interval plant arrangement patterns com- bined three different discharges to simulate the flow effects of plant distribution on the floodplain. The experimental result showed the unilateral interval plant was a beneficial method to reduce flood velocity, increase the stability of the main channel and protect the riverbed. Key Words : Floodplain plant, flow field, unilateral interval plant. 生對水中的流場變化及流速剖面，Chen et al. (2011) 以彈性纖 一、前 言 維束模擬隱沒植生在不同密度狀態下，流速剖面及河床型態的 台灣河川的流量在豐枯期間差異甚大