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.