大藤峡一期工程运行期间水体总溶解气体变化特征  

Variation characteristics of total dissolved gas in water during the operation of the phase I of the Datengxia project

作　　者：高薪渊 吴文强[1] 甘霖 屈学友 杜剑威 GAO Xinyuan;WU Wenqiang;GAN Lin;QU Xueyou;DU Jianwei(Institute of Water Ecological Environment,China Institute of Water Resources and Hydropower Research,Beijing 100038,China)

机构地区：[1]中国水利水电科学研究院水生态环境研究所,北京100038

出　　处：《环境保护科学》2024年第3期89-95,共7页Environmental Protection Science

基　　金：国家自然科学基金青年项目(52000181)。

摘　　要：在大坝泄水时,大量空气被夹带溶入水体,导致水体中总溶解气体(TDG)过饱和,其负面生态影响会在下游河道持续存在一定距离,增加鱼类患气泡病的风险。为研究大藤峡水利枢纽一期工程建成运行后下游水体中TDG的变化规律,该研究开展了连续监测。结果显示:大藤峡库区水体中TDG过饱和现象不明显,对下游水生态影响很小,且过坝引起的TDG增量与大藤峡出库流量具有较好的线性关系。日均出库流量在6 000 m^(3)/s以下时,下游水体中TDG浓度在100%附近波动,不存在过饱和问题;日均出库流量达到8 000 m^(3)/s或更高时,在下游水体监测到120%以上的高TDG浓度,但在坝下20 km回落至标准限值110%以下,对下游生态影响不大。郁江支流汇入对干流水体中高浓度TDG逸散有较强的促进作用。When the dam is discharged,a large amount of air is absorbed into the water,resulting in supersaturation of total dissolved gas(TDG),and its negative ecological impact will persist for a certain distance in the downstream river,increasing the risk of bubble disease in fish.To study the change characteristics of TDG during the operation of Phase I of the Datengxia Project,continuous monitoring of TDG was carried out.The results showed that the phenomenon of TDG saturation in the water body of Dtengxia reservoir is not obvious,which had little effect on the downstream water ecology,and the TDG increment caused by dam crossing had a good linear relationship with the discharge of Dtengxia reservoir.When the daily average discharge was below 6000 m^(3)/s,the concentration of TDG in the downstream fluctuated around 100%,and there was no supersaturation problem.When the daily average discharge rate reached 8000 m^(3)/s or higher,a high TDG concentration of more than 120%was detected in the downstream water body but fell below the standard limit of 110%20 km below the dam,which had little impact on the downstream ecology.The merging of Yujiang tributaries had a strong promoting effect on the dispersion of high-concentration TDG in the mainstream water body.

关 键 词：大坝泄流 总溶解性气体 过饱和 干支流交汇 释放速率 

分 类 号：X143[环境科学与工程—环境科学] TV131.34[水利工程—水力学及河流动力学]