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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Ground-penetrating radar observations of enhanced biological activity in a sandbox reactor
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Ground-penetrating radar observations of enhanced biological activity in a sandbox reactor

机译：在沙箱反应堆中增强生物活动的探地雷达观测

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In this study, we evaluate the use of ground-penetrating radar (GPR) to investigate the effects of bacterial activity in water saturated sand. A 90-day laboratory-scale controlled experiment was conducted in a flow-through polycarbonate sandbox using groundwater from the Kansas River alluvial aquifer as inoculum. After 40 days of collecting baseline data, bacterial growth was stimulated in the sandbox by the addition of a carbon and nutrient solution on a weekly basis. Radar signal travel time and attenuation were shown to increase downgradient of the nutrient release wells relative to upgradient locations. After 60 days, the frequency of nutrient injections was increased to twice per week, after which gaseous bubbles were visually observed downgradient of the nutrient release wells. Visual observation of active gas production correlated spatially and temporally with a rapid decrease in radar signal travel time, confirming that GPR can monitor the generation of biogenic gases in this system. Analysis of the sediments indicated microbial lipid biomass increased by approximately one order of magnitude and there were no changes in the inorganic carbon content of bulk sediment mineralogy. These findings suggest that the increase in biomass and gas production may be responsible for the observed changes in radar signal travel time reported in this study. Therefore, this study provides evidence that GPR can be used to monitor biological activity in water saturated sand.
机译：在这项研究中，我们评估了探地雷达（GPR）的使用，以研究在饱和水砂中细菌活动的影响。在一个流通聚碳酸酯砂箱中，使用堪萨斯河冲积含水层的地下水作为接种物，进行了90天的实验室规模的对照实验。收集基线数据40天后，通过每周添加碳和营养液刺激沙箱中细菌的生长。雷达信号传播时间和衰减显示出相对于向上位置，营养物释放井的向下位置增加。 60天后，养分注入的频率增加到每周两次，然后肉眼观察到养分释放井的降级现象。目视观察活性气体的产生在空间和时间上与雷达信号传播时间的迅速减少相关，这证实了GPR可以监视该系统中生物气的产生。对沉积物的分析表明，微生物脂质生物量增加了大约一个数量级，并且整体沉积物矿物学中的无机碳含量没有变化。这些发现表明，生物量和气体产量的增加可能是本研究报告的观测到的雷达信号传播时间变化的原因。因此，这项研究提供了证据，表明GPR可用于监测水饱和砂中的生物活性。

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