TDG过饱和高含沙水体对岩原鲤的急性效应研究

发布时间：2018-03-22 21:33

本文选题：TDG过饱和　切入点：泥沙　出处：《水力发电学报》2017年10期 　论文类型：期刊论文

【摘要】：大坝泄洪水体具有泥沙浓度高且总溶解气体(Total Dissolved Gas,TDG)过饱和的特点,TDG过饱和含沙水体威胁着下游河道鱼类的生存,正成为日渐突出并日益受到广泛关注的生态环境影响之一。为进一步探讨TDG过饱和含沙水体对鱼类影响的规律,选一年龄岩原鲤幼鱼为实验对象,以中值粒径为7μm的泥沙为实验用沙,对TDG饱和度为100%、125%、130%、135%、140%的水体,分别设置0、200、600、800、1000 mg/L的含沙量实验工况,开展含沙水体TDG过饱和的持续暴露实验。实验结果表明:岩原鲤幼鱼受TDG过饱和含沙水体胁迫时,TDG饱和度越高,含沙量越大,岩原鲤幼鱼半致死时间越小,泥沙加速了该鱼类在过饱和TDG含沙水体中的死亡,但过饱和TDG仍是引起岩原鲤死亡的主要因素。此外,TDG饱和度为100%的各含沙实验组(200~1000 mg/L)中,泥沙单独作用未造成岩原鲤幼鱼死亡。
[Abstract]:The flood discharge water of the dam has the characteristics of high sediment concentration and total dissolved Dissolved gas (TDG) supersaturation. TDG supersaturation is threatening the survival of fish in the downstream channel. In order to further study the effect of TDG supersaturated sediment water on fish, we selected the juvenile of rock carp as the experimental object. Taking the sediment with the median diameter of 7 渭 m as the experimental sand, the experimental conditions of the sediment content of 0 200600800 ~ 1000 mg/L were set up for the water body with a TDG saturation of 100 ~ 125 and 130 ~ 135 ~ 140%, respectively. The continuous exposure experiment of TDG supersaturation in sand bearing water was carried out. The results showed that the higher the saturation and the higher the sediment content of the juvenile fish, the smaller the half lethal time of the juvenile fish, when the juvenile fish was under the stress of TDG supersaturated water body. Sediment accelerated the death of the fish in supersaturated TDG sediment water, but supersaturated TDG was still the main cause of death. Sediment alone did not result in the death of juvenile Carpio Carpio.
【作者单位】：西华大学能源与动力工程学院;西华大学流体及动力机械教育部重点实验室;四川大学水力学与山区河流开发保护国家重点实验室;
【基金】：国家自然科学基金(51509213;51409224) 流体及动力机械教育部重点实验室学术培育项目(SBZDPY-11-10)
【分类号】：Q958.8;TV143

【相似文献】