Ray-Shyan Wu, Yan-Ru Chen, Yi-Liang Ge
Department of Civil Engineering, National Central University, Zhongli 32001, Taiwan, China.
Ying Yong Sheng Tai Xue Bao. 2012 Apr;23(4):923-30.
Based on the HEC-RAS and River 2D modes, and taking 5% change rate of weighted usable area (WUA) as the threshold to define the spur dike- affected area of target fish species Acrossocheilus paradoxus in Fazi River in Taiwan, this paper studied the affected area of the fish habitat by spur dike, and, in combining with the references about the installations of spur dikes in Taiwan in recent 10 years, analyzed the relative importance of related affecting factors such as dike height, dike length (water block rate), average slope gradient of river way, single or double spur dike, and flow discharge. In spite of the length of the dike, the affected area in downstream was farther, and was about 2-6 times as large as that in upstream. The ratio of the affected area in downstream / upstream decreased with increasing slope gradient, but increased with increasing dike length and flow discharge. When the discharge was approximate to 10 years return periods, the ratio of the affected area would be close to a constant of 2. Building double spur dike would produce a better WUA than building single spur dike.
基于HEC-RAS和River 2D模型，以加权可用面积（WUA）5%的变化率为阈值，界定台湾筏子溪台湾铲颌鱼的丁坝影响区域，本文研究了丁坝对鱼类栖息地的影响范围，并结合台湾近10年丁坝设置的相关资料，分析了坝高、坝长（阻水率）、河道平均坡度、单双丁坝及流量等相关影响因素的相对重要性。无论丁坝长度如何，下游的影响范围更远，约为上游的2至6倍。下游/上游影响面积之比随坡度增加而减小，但随坝长和流量增加而增大。当流量接近10年一遇时，影响面积之比将接近常数2。建造双丁坝比建造单丁坝能产生更好的WUA。
