Working Paper Article Version 1 This version is not peer-reviewed

Erosion Gully Restoration by Soil Reconstructed with Coal Gangue in Black Soil Area of Northeast China

Version 1 : Received: 7 November 2019 / Approved: 8 November 2019 / Online: 8 November 2019 (06:54:43 CET)

How to cite: Wang, Z.; Li, D.; Wang, B.; Zhang, J. Erosion Gully Restoration by Soil Reconstructed with Coal Gangue in Black Soil Area of Northeast China. Preprints 2019, 2019110090 Wang, Z.; Li, D.; Wang, B.; Zhang, J. Erosion Gully Restoration by Soil Reconstructed with Coal Gangue in Black Soil Area of Northeast China. Preprints 2019, 2019110090

Abstract

The influence of hydraulic erosion in the black soil slope cultivated land area of Northeast China is serious, but the study of gully restoration in black soil area is less. In this paper, based on the principle of soil reconstruction, coal gangue is used as the filling matrix of gully repaired and the surface soil is used to simulate gully restoration. In order to explore the influence of the thickness of coal gangue and the combined structural change of soil thickness on the reconstruction of soil physical and chemical properties, the tests of hydraulic properties and physical and chemical properties were carried out in the soil column. In this study, a total of 36 large-diameter coal gangue (30cm, 40cm, 50cm), small-diameter coal gangue (30cm, 40cm, 50cm, 60cm) and covering soil (50cm, 60cm, 70cm) deal with. The effects of various component changes on infiltration performance, water storage capacity and physical and chemical properties were discussed. The results showed that coal gangue thickness has varied effects on the infiltration rate and cumulative infiltration of the reconstructed soil. The combination of large-sized coal gangue thickness of 50cm, small-sized coal gangue thickness of 50-60cm, and soil thickness of 50cm was found to be the best. In addition, the Philp, Kostiakov and Horton models were used to fit the infiltration data from each treatment. The Kostiakov model most suitably applied to the infiltration of reconstructed soil. The water storage capacity of the reconstructed soil indicated that the soil cover thickness determines its water storage capacity and that the interaction between the large-sized coal gangue and the topsoil thickness has a significant effect on the maximum retained water storage capacity. The soil layer was also found to be positively correlated with the chemical components of the reconstructed soil, and the large-sized and small-sized coal gangue contributed to reducing the loss of chemical components from the reconstructed soil. In addition, coal gangue had significant or extremely significant effects on the total porosity, reconstructed soil subsidence and drainage-irrigation ratio. The interaction between large-sized coal gangue and topsoil had significant effects on the reconstructed soil subsidence and drainage-irrigation ratio, which is beneficial to reconstructed soil stability and surface water-groundwater conversion. The results indicate that the coal gangue-reconstituted soil structure significantly changed the hydraulic properties and physico-chemical properties of the soil and that large-sized coal gangue of 50cm thickness, small-sized coal gangue of 50-60cm thickness, and topsoil of 50-70cm thickness should be used to fill and repair erosion gullies.

Subject Areas

soil reconstructed; erosion restoration; slope cultivated land use; infiltration processes; soil conservation

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