摘要
高坝泄洪造成的总溶解气体(TDG)过饱和威胁河道生态安全,目前尚无较好的解决方法。因此,采用平面二维数值模型,针对日调节水库运行特征,研究了不同间歇性泄洪工况下的TDG饱和度分布。结合鱼类对TDG饱和度的耐受能力,分析了间歇性泄洪工况下可供鱼类躲避区域面积的变化规律。结果表明,在等时段间歇性泄洪模式下,随着间歇时间增加,鱼类可躲避区域面积平均值逐渐增加,但可躲避区域面积最小值随间歇时间增加先减小后增大;在不等时段间歇性泄洪模式下,提高间歇时间与泄洪时间之比将增加鱼类可躲避区域面积,降低可躲避区域面积最小值。研究结果可为高坝工程制定生态调度提供方法参考,对维护河流生态安全具有一定的生态意义。
The total dissolved gas(TDG)supersaturation induced by high dam flood discharge have a threat to the ecological safety of river,and this problem has not been solved well.In this study,a two-dimensional numerical model was used to study the TDG saturation distribution under different intermittent flood discharge conditions according to the operation characteristics of the daily regulation reservoir.Based on the tolerance of fish to the stress of supersaturated TDG,the avoidance space for fish under intermittent flood discharge conditions was analyzed.The results indicate that in the intermittent flood discharge mode with equal time intervals,as the interval time increased,the average avoidance space gradually increased,but the minimum avoidance space first decreased and then increased with the increase of interval time;In the intermittent flood discharge mode of unequal time periods,increasing the ratio of intermittent time to flood discharge time will increase the average avoidance space and reduce the minimum avoidance space.The research can provide a method reference for formulating ecological scheme for high dam projects,and has certain ecological significance for maintaining river ecological security.
作者
王莉
唐琦
冀前锋
梁瑞峰
李克锋
WANG Li;TANG Qi;JI Qian-feng;LIANG Rui-feng;LI Ke-feng(PowerChina Chengdu Engineering Co.,Ltd.,Chengdu 611130,China;Sichuan Water Development Investigation,Design&Research Co.,Ltd.,Chengdu 610072,China;Changjiang Water Resources Protection Institute,Wuhan 430051,China;State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China)
出处
《水电能源科学》
北大核心
2025年第2期78-83,共6页
Water Resources and Power
基金
国家自然科学基金项目(U2240212)。
关键词
调度方案
数值模拟
TDG过饱和
可躲避区域
间歇性泄洪
operation scheme
numerical simulation
TDG supersaturation
avoidance space
intermittent flood discharge
