钙质砂电导率与相关性问题初探

Preliminary study of conductivity and correlation problems of calcareous sand

处于海洋环境中的钙质砂一般饱水含盐,将盐度评价重要参量电导率用于钙质砂中,以钙质砂的电导率反映其中的水体含盐量,对海洋环境下钙质砂土水质评价有重要意义。在某灰沙岛上选取裸露空旷的钙质砂地,距地面0.5、1.0、1.5 m的深度处埋设土壤电导率、体积含水率和温度传感器,观测记录不同深度范围钙质砂的电导率和体积含水率。基于现场钙质砂土电导率、体积含水率观测、室内不同级配的钙质砂电导率测试以及Manta2水质传感器室内测试校核,分析钙质砂电导率与孔隙水电导率的关系。结果表明,钙质砂电导率与体积含水率和孔隙水的电导率均呈线性关系,提出了适用于钙质砂电导率的计算模型。

Calcareous sand is generally saturated with salt water in marine environment. Conductivity is an important parameter in salinity evaluation which can reflect the salinity of the water. Therefore, the conductivity of calcareous sand has great significance in water quality evaluating of calcareous sand in marine environment. In this paper, we selected an exposed open calcium sand on a calcareous sand island, and buried triple sensors of soil conductivity, volumetric water content and temperature at the depths of 0.5, 1.0, 1.5 m to monitor the calcareous sand conductivity and volumetric water content. The relationship between calcareous sand conductivity and pore water conductivity is analyzed based on conductivity and volumetric water content site observation, conductivity indoor testing and Manta2 water quality sensor verification of calcareous sand with different gradations. The results show that the conductivity of calcareous sands has linear relationship with the volumetric water content and the conductivity of pore water respectively, and then promote a calculation model for the conductivity of calcareous sand.