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进行农田灌溉和排水试验时,常需要测量地下水位,测量地下水位目前使用的方法有直尺测量、软尺测量,也有使用电子式或电流式水位测量计的。由于田间试验,地下水位测孔较多,用直尺或软尺测量,不仅工作量大,而且误差也较大,而使用电子式或电流式水位计,价格又较昂贵,故难以普遍使用,而且感应头容易氧化,导致测量误差。我们在科研实践中,自制了一种用泡膜塑料作浮子的浮尺,经长期使用,该浮尺制作简便,造价低廉,使用可靠,误差小。现介绍如下,供参考。
When conducting field irrigation and drainage tests, it is often necessary to measure the groundwater level and to measure the groundwater level. There are currently available methods of ruler measurements and soft foot measurements, as well as the use of electronic or current water level gauges. Due to field tests, there are many holes in the groundwater table. Measuring with straightedge or ruler not only requires a lot of work but also has a large error. However, the use of electronic or current-type water level gauges is expensive and therefore difficult to be used universally. And the sensor head easily oxidized, resulting in measurement error. In our research and practice, we made a floating ruler made of bubble plastic film as a float. After long-term use, the floating ruler is easy to manufacture with low cost, reliable operation and small error. Now introduced as follows for reference.