生态丁坝在齐口裂腹鱼产卵场修复中的应用

通过水深平均二维水动力学模型，模拟不同流量下生态丁坝附近水流沿纵向和横向的水深、流速等分布规律，绘制L形及正交情况下生态丁坝其周围流场特征，研究生态丁坝对齐口裂腹鱼产卵场水力生境的影响范围；根据齐口裂腹鱼适宜性曲线，得到一定流量下研究河段的Weighted Usable Area (WUA)值。研究成果表明：长度与稳定河宽之比介于0.25至0.33之间，而坝头与坝长之比介于0.20至0.25范围之内的L形及正交生态丁坝，交错放置于河道中，可以营造出合适的水流流态，使其满足齐口裂腹鱼产卵的水力特性，增加WUA值；修复后的产卵场水力生境与天然产卵场的水力生境相似度高。

Application of Ecological Spur Dike Repairing Schizothorax Prenanti Spawning Ground

By using depth-averaged two-dimensional hydrodynamic model to simulate water depth and velocity distribution under different flow rates around L-shape and orthogonal shape ecological spur dikes, and drawing characteristic of its flow field, the impact range was acquired on setting spur dikes around Schizothorax Prenanti spawning ground. Based on Schizothorax Prenanti suitability curves, WUA value can be got from repairing river. Research results show that L-shape and orthogonal shape ecological spur dikes, the ratio of its body length to river width kept between 0.25 and 0.33 and the ratio of its head length to the length stayed between 0.2 and 0.25, staggered in the river, which can create a suitable flow pattern and satisfy the hydraulic characteristics of Schizothorax Prenanti spawning and increase WUA value. After the rehabilitation measures were carried out, the hydraulic condition similarity was high.