Abstract Gantzer PA, Preece EP, Nine B, Morris J. 2019. Decreased oxygenation demand following hypolimnetic oxygenation. Lake Reserv Manage. 35:292–307. We analyzed long-term oxygenation dynamics in 3 waterbodies: Spring Hollow Reservoir (SHR) and Carvins Cove Reservoir (CCR), which are water supply reservoirs, and North Twin Lake (NTL), a natural lake. Bubble plume line diffuser hypolimnetic oxygenation system (HOS) operation was for 13, 10, and 7 yr for SHR, CCR, and NTL, respectively. Water column profiles were measured in all 3 waterbodies. Additionally, remotely deployed sensors were used to monitor dissolved oxygen (DO) in NTL year-round, specifically to capture winter conditions during ice cover. Hypolimnetic oxygen demand (HOD) was observed to decrease after several years of HOS operation in all 3 waterbodies. Annual HOD decreased more for HOS operated year-round compared to recovery-based operation where HOS was started after DO decreased below 5.0 mg/L. Additionally, HOD throughout the summer stratified period was lower following maintenance of higher DO during spring prior to onset of stratification. An analogous result was observed during winter ice cover relative to DO conditions following fall turnover. Prior work showed increased HOD during HOS operation compared to pre-HOS. The increased HOD during HOS operation was termed diffuser-induced oxygen demand and implied the HOS was inducing oxygen demand. However, the current work shows HOS operation is not actually inducing oxygen demand; rather, it is addressing the existing oxygen demand already in the sediments. Our data suggest that a HOS is an effective tool to maintain hypolimnion DO in stratified lakes and reservoirs. When operated year-round or before DO decreases, HOS can decrease HOD and reduce overall long-term operational costs.

中文翻译：

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水下氧合操作后氧合需求减少

摘要 Gantzer PA、Preece EP、Nine B、Morris J. 2019 年。低水位氧合后氧合需求减少。湖泊保护区管理。35:292-307。我们分析了 3 个水体的长期氧合动态：Spring Hollow Reservoir (SHR) 和 Carvins Cove Reservoir (CCR)，它们是供水水库，以及 North Twin Lake (NTL)，一个天然湖泊。SHR、CCR 和 NTL 的气泡羽流线扩散器潜水氧合系统 (HOS) 运行时间分别为 13、10 和 7 年。在所有 3 个水体中都测量了水柱剖面。此外，远程部署的传感器用于全年监测 NTL 中的溶解氧 (DO)，专门用于捕捉冰盖期间的冬季条件。在所有 3 个水体的 HOS 运行几年后，观察到低脑需氧量 (HOD) 下降。与基于恢复的操作（在 DO 降至 5.0 mg/L 以下后开始居屋）相比，全年运营的居屋的年度 HOD 下降更多。此外，在分层开始之前的春季维持较高的 DO 后，整个夏季分层期间的 HOD 较低。与秋季周转后的 DO 条件相比，在冬季冰盖期间观察到类似的结果。先前的工作表明，与居屋前相比，居屋操作期间的居屋增加了。HOS 操作期间增加的 HOD 被称为扩散器引起的需氧量，并暗示 HOS 正在引起需氧量。然而，目前的工作表明居屋操作实际上并没有引起需氧量；相反，它正在解决沉积物中已有的氧气需求。我们的数据表明，居屋是维持分层湖泊和水库中水下溶解氧的有效工具。当全年或在 DO 减少之前运营时，HOS 可以降低 HOD 并降低整体长期运营成本。