Hydrogeology Group, Institute of Geological Sciences, Freie Universität Berlin, Malteserstr. 74-100, Berlin 12249, Germany.
Ground Water. 2011 May-Jun;49(3):450-3. doi: 10.1111/j.1745-6584.2010.00771.x. Epub 2010 Nov 18.
Submersible data loggers are widely used for groundwater monitoring, but their application often runs the risk of hardware and data loss through vandalism or theft. During a field study in India, the authors of this article experienced that well locks attract the attention of unauthorized persons and do not provide secure protection in unattended areas. To minimize the risk of losing data loggers, a cheap and simple solution has been invented to hide the instruments and associated attachments below the ground surface, inside observation wells. It relies on attaching the logger to a length of small-diameter pipe that is submerged at the bottom of the well, instead of attaching it to the top of the well. The small-diameter pipe with the logger is connected to a small bottle containing a magnet that floats on the water surface of the well and can be recovered using another bottle also with a magnet. A logger that is concealed in this way is difficult to detect and access without knowledge of the method and adequate removal tools. The system was tested and successfully applied for monitoring shallow observation wells at three field sites in Greater Delhi, India.
可潜式数据记录仪被广泛用于地下水监测，但它们的应用常常存在硬件和数据丢失的风险，这是由于人为蓄意破坏或盗窃造成的。本文作者在印度进行实地研究时发现，井锁会引起未经授权人员的注意，并且在无人值守的区域不能提供安全保护。为了最大限度地降低数据记录仪丢失的风险，发明了一种廉价且简单的解决方案，即将仪器和相关附件隐藏在地面以下的观测井内。该方案的原理是将记录仪固定在一段小直径的管道上，将管道的底部浸入井中，而不是将其固定在井口。带有记录仪的小直径管道与一个装有磁铁的小瓶子相连，该小瓶子漂浮在井的水面上，可以使用另一个也带有磁铁的瓶子将其回收。以这种方式隐藏的记录仪，如果不知道该方法和适当的移除工具，则很难被发现和访问。该系统在印度大德里的三个野外场地的浅层观测井中进行了测试和成功应用。
