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原位监测滨海盐渍土的水盐运移对合理开发利用水土资源具有重要价值。本文通过一维垂直入渗试验,采用自主研发的电阻率自动监测装置实时测定黄河三角洲滨海盐渍土淋洗过程中土柱电阻率的垂向变化并基于电阻率监测结果对一维垂直入渗试验中的淋洗过程以及淋洗后土壤脱盐效果进行了分析。结果表明:通过该监测装置的实时数据可以监测到淋洗过程中电阻率峰值的下移和逐渐消失的过程。伴随着淋洗次数的增加,土柱由上部依次向下脱盐且每次淋洗后土柱脱盐的深度基本一致,约为10 cm。电阻率读数与含盐量呈现显著的幂指数相关,相关系数为0.941。该监测装置可以按照实际需求设置其时间和空间分辨率从而实现水盐运移的远程、原位、动态监测,为盐渍化的监测、评估和预警提供了一种有效的手段。
In situ monitoring of water and salt transport in coastal saline soil is of great value to the rational development and utilization of soil and water resources. In this paper, one-dimensional vertical infiltration test, the use of self-developed resistivity automatic monitoring device for real-time determination of the Yellow River Delta Coastal saline soil during elution levitation vertical change of soil column resistivity and monitoring results based on the one-dimensional vertical infiltration The leaching process in the experiment and the effect of soil desalting after rinsing were analyzed. The results show that the real-time data of the monitoring device can be used to monitor the process of decreasing and disappearing of the peak resistivity during the leaching process. With the increase of rinsing times, the soil column desalinated downward from the top and the depth of soil column desalination after each rinsing was basically the same, about 10 cm. The resistivity readings were significantly related to the salinity index, with a correlation coefficient of 0.941. The monitoring device can set its spatial and temporal resolution according to the actual demand so as to realize the remote, in situ and dynamic monitoring of water and salt migration and provide an effective measure for the monitoring, assessment and early warning of salinization.