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Fiber Optic Measurements of Soil Moisture in a Waste Rock Pile
Ground Water ( IF 2.6 ) Pub Date : 2021-01-18 , DOI: 10.1111/gwat.13075
Robert Wu , Vincent Martin 1 , Jeffrey M McKenzie 2 , Stefan Broda 3 , Bruno Bussière 4 , John Selker 5 , Michel Aubertin 6
Affiliation  

The design and construction of a waste rock pile influences water infiltration and may promote the production of contaminated mine drainage. The objective of this project is to evaluate the use of an active fiber optic distributed temperature sensing (aFO-DTS) protocol to measure infiltration and soil moisture within a flow control layer capping an experimental waste rock pile. Five hundred meters of fiber optic cable were installed in a waste rock pile that is 70 m long, 10 m wide, and was covered with 0.60 m of fine compacted sand and 0.25 m of non-reactive crushed waste rock. Volumetric water content was assessed by heating the fiber optic cable with 15-min heat pulses at 15 W/m every 30 min. To test the aFO-DTS system 14 mm of recharge was applied to the top surface of the waste rock pile over 4 h, simulating a major rain event. The average volumetric water content in the FCL increased from 0.10 to 0.24 over the duration of the test. The volumetric water content measured with aFO-DTS in the FCL and waste rock was within ±0.06 and ±0.03, respectively, compared with values measured using 96 dielectric soil moisture probes over the same time period. Additional results illustrate how water can be confined within the FCL and monitored through an aFO-DTS protocol serving as a practical means to measure soil moisture at an industrial capacity.

中文翻译:

废石堆中土壤水分的光纤测量

废石堆的设计和施工会影响水的渗透,并可能促进受污染矿山排水的产生。该项目的目标是评估使用有源光纤分布式温度传感 (aFO-DTS) 协议来测量覆盖实验废石堆的流量控制层内的渗透和土壤湿度。500 米长的光缆安装在一个长 70 m,宽 10 m 的废石堆中,上面覆盖着 0.60 m 的细密实砂和 0.25 m 的非反应性碎石。通过每 30 分钟以 15 W/m 的功率加热 15 分钟热脉冲来评估体积含水量。为了测试 aFO-DTS 系统,在 4 小时内将 14 毫米的补给施加到废石堆的顶面,模拟大雨事件。在整个测试期间,FCL 中的平均体积含水量从 0.10 增加到 0.24。与使用 96 个介电土壤湿度探头在同一时期测量的值相比,在 FCL 和废石中使用 aFO-DTS 测量的体积含水量分别在 ±0.06 和 ±0.03 以内。其他结果说明了如何将水限制在 FCL 内并通过 aFO-DTS 协议进行监测,该协议作为以工业能力测量土壤水分的实用手段。
更新日期:2021-01-18
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