黄河三角洲滨海盐渍土水盐运移监测研究

Experimental Research to Monitor The Yellow River Delta Saline Soil Water and Salt Transport

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 coastal saline soil water and salt transport is of great value on the rational exploitation of water and soil resources.In this paper,a vertical infiltration experiment was conducted to monitor the vertical variation of resistivity in the leaching process by the designed automatic monitoring device for analyzing the leaching process and desalination.The experimental results showed that the resistivity peak fade away in the course of leaching.With the increase of leaching times,the desalination depth was about 10 cm each time from the top to bottom of soil column,remaining unchanged.Resistivity indication and salinity content showed a significant exponential correlation with the coefficient of 0.941.The temporal and spatial resolution of this monitoring device can be adjusted according to the actual requirement.So the device can not only achieve the remote,in situ and dynamic monitoring data of water and salt transport,but also provide an effective method in monitoring,assessment and early warning of salinization.