Journal of Ecology and Rural Environment ›› 2019, Vol. 35 ›› Issue (4): 529-537.doi: 10.19741/j.issn.1673-4831.2018.0506

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Representation and Inversion of Reconstructed Soil Volumetric Water Content in Loess Open Pit Mining Area

LUO Gu-bai1, CAO Yin-gui1,2, BAI Zhong-ke1,2, KUANG Xin-yu1, WANG Shu-fei1, SONG Lei1   

  1. 1. School of Land Science and Technology, China University of Geosciences, Beijing 100083, China;
    2. Key Laboratory of Land Consolidation and Rehabilitation, Ministry of Natural Resources, Beijing 100035, China
  • Received:2018-08-21 Online:2019-04-25 Published:2019-04-25

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Abstract:

The south dumping site of the Pingshuo Antaibao Open-Pit Coal Mine of China Coal Energy was taken as a research object, aiming to reveal the characteristics of the depth difference of the soil volumetric water content in the reconstructed soil profile of the reclaimed land in the ground penetrating radar(GPR) signal map, and a fitting model of Soil volumetric water content and dielectric constant was established. The volumetric water content of the reconstructed soil profile at different locations of the dump site in the mining area was obtained by two methods:ring knife sampling weighing and GPR detection. The test results were analyzed by means of analysis of variance, fitting analysis and comparative analysis. The results show that the volumetric water content of reconstructed soil profiles in different positions of dump and different depths of the same section is obviously different;the P2 profile showed two distinct peaks at 10-20 and 50-60 cm depth. Within 0-20 cm depth of P5 profile, soil volumetric water content was higher, and the standard deviation was 4.84%. By comparison, the soil volumetric water content calculated by the Topp model was slightly higher than the measured soil volumetric water content. The absolute value of the difference of soil volumetric water content calculated by sampling and Topp model was 3.20% and the minimum was 0.13%, and the average deviation rate was 13.42%. The soil volumetric water content of the model inversion was slightly lower than the measured soil volumetric water content. The absolute value of the difference in soil volumetric water content measured by the two methods was 3.11%, the minimum was 0.23%, and the average deviation rate was 9.83%. GPR can analyze the difference of soil volumetric water content in the reconstructed area of the mining area. In addition, the research results in this paper are helpful to enrich the basic principles of soil reconstruction in mining areas and to provide strong support for GPR non-destructive detection of soil volumetric water content.

Key words: soil volumetric water content, soil reconstruction, land reclamation, ground penetrating radar, dielectric constant

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