Hypolimnetic oxygenation 4. Effects on turbidity in Camanche Reservoir and its downstream fish hatchery
Hypolimnetic oxygenation 4. Effects on turbidity in Camanche Reservoir and its downstream fish hatchery
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DOI：
10.1080/10402381.2020.1739180
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发表时间：
2020-05-15
影响因子：
1.5
通讯作者：
Horne，Alex J.
中科院分区：
文献类型：
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作者：
Horne，Alex J.
霍恩AJ。2019年b。4.对Camanche水库及其下游鱼类孵化场浊度的影响。湖和保护区管理。36：360- 375.泥沙是水库、河流和孵化场管理人员的主要关注点，部分原因是沉积物会使鱼卵窒息。的Camanche水库hypolimnetic氧化系统（HOS）的氧化羽足够接近沉积物，以抑制释放的营养物质，硫化氢和甲基汞。实验和模型预测很少有沉积物再悬浮的羽。在居屋运作的第一年（1993年），水库内的开/关测试显示，平均浊度在300米范围内有小幅（x= 1.4 NTU）且无统计学意义的增加，在1.5公里处最小（0.3 NTU），在第二年（1994年）并不明显。浊度增加是由于微小的（<2 μm）方解石颗粒所造成的湖泊白化在强烈的光合作用期间蓝藻水华之前，HOS。在鱼类孵化场的Turkish大幅下降（4至2 NTU，1991年夏季与1994年），平均2.5 NTU在1999年和2009年。这种下降可能是由于79%的HOS诱导的叶绿素减少，因为底部浊度与藻类水华（R2= 0.57），如果滞后4周，让藻类下沉。其结果将是更少的浮游生物遗骸和更少的湖泊白化颗粒下沉到深水中。显微镜检查、粒度谱分析和颗粒化学指纹分析表明，卵盘沉积物（主要为无机硅硅藻硅藻壳和风成尘，粒度谱均匀，从0 ~ 200 μm）与库底流出物（主要为有机物和<2 μm的方解石颗粒）不同。
Horne AJ. 2019b. Hypolimnetic oxygenation 4. Effects on turbidity in Camanche Reservoir and its downstream fish hatchery. Lake and Reserve Manage. 36:360–375.Turbidity is a major concern for reservoir, river, and hatchery managers, partially because sediments smother fish eggs. The oxygenated plume of the Camanche Reservoir hypolimnetic oxygenation system (HOS) is close enough to the sediments to suppress releases of nutrients, hydrogen sulfide, and methylmercury. Experiments and models predicted little sediment resuspension from the plume. On/off in-reservoir tests in the initial year of HOS operation (1993) showed a small (x= 1.4 NTU) and not statistically significant increase in average turbidity that extended over 300 m, was minimal at 1.5 km (0.3 NTU), and was not apparent in the next year (1994). Increased turbidity was attributed to tiny (<2 μm) calcite particles caused by lake whitening during intense periods of photosynthesis during cyanobacterial blooms prior to HOS. Turbidity in the fish hatchery declined substantially (4 to 2 NTU, summer 1991 vs. 1994) and averaged 2.5 NTU in 1999 and 2009. This decline is likely due to the 79% HOS-induced decrease in chlorophyll, because bottom turbidity was related to algae blooms (R2= 0.57) if lagged by 4 weeks to allow the algae to sink. The result would be less planktonic remains and fewer lake whitening particles sinking to deep water. Microscopic examination, size spectrum analysis, and chemical fingerprinting of particles showed that egg tray sediments (mostly inorganic silica diatom frustules and aeolian dust with an even size spectrum from 0 to 200 μm) were not like those in the reservoir bottom water outflow (mostly organic and <2-μm calcite particles).