摘要
水流条件改变以及河床变形会影响鱼类栖息地适宜性水平。为了定量评估和预测长江中下游不同分汊河段对鱼类栖息地的影响,我们选取中国鲤鱼作为目标鱼类构建相应的生态水力模型。通过模型模拟,得到该种鱼成鱼和幼鱼不同流量条件下的生境指标。结果表明:两段河流的成鱼栖息地适宜度随着流量的增加而增加,幼鱼栖息地适宜度随着流量的增加则先增加后减小。此外,从长期来看,鱼类栖息地适宜度会随着时间的延长而降低。在20年以后,由于河床变形而导致的水动力条件变化,使得两段河流可能不再适合中国鲤鱼生存。
Changes in water flow conditions and riverbed deformation can affect the suitability of fish habitat.To quantitatively evaluate and predict the impact of different bifurcation river sections in the middle and lower reaches of the Yangtze River on fish habitat,we selected Chinese carp as the target fish species and constructed a corresponding ecological hydraulic model by using model simulation.Habitat indicators for the fish under different flow conditions for adults and juveniles was obtained.The results showed that the suitability of adult fish habitat in the two river sections increased with increasing flow,while the suitability of juvenile fish habitat increased first and then decreased with increasing flow.In addition,in the long term,the suitability of fish habitat will decrease over time.After 20 years,due to changes in water dynamics caused by riverbed deformation,the two river sections may no longer be suitable for the survival of Chinese carp.
作者
李宜珂
包美霞
王茜茜
王逸航
葸玉千
姚慰炜
LI Yike;BAO Meixia;WANG Qianqian;WANG Yihang;XI Yuqian;YAO Weiwei(State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu,Sichuan 610065,China)
出处
《水利与建筑工程学报》
2023年第3期241-247,共7页
Journal of Water Resources and Architectural Engineering
关键词
长江中下游
分汊河段
中国鲤鱼
栖息地适宜性
middle and lower reaches of the Yangtze River
braided sections
Chinese carp
habitat suitability
