| Influence mechanism and model construction of biogas slurry hole irrigation parameters on soil infiltration characteristics |
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| DOI：10.7606/j.issn.1000-7601.2025.06.17 |
| Key Words: biogas slurry hole irrigation hole parameter wetting front migration cumulative infiltration HYDRUS-2D model |
| Author Name | Affiliation | | TANG Xiaojuan | Gansu Provincial Research Institute of Water Resources, Lanzhou, Gansu 730070, China | | XIANG Peng | School of Civil and Hydraulic Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China | | ZHENG Jian | School of Civil and Hydraulic Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China | | WANG Ying | Gansu Provincial Research Institute of Water Resources, Lanzhou, Gansu 730070, China |
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| Abstract: |
| To explore the effects of biogas slurry ratio, hole diameter, and depth on the soil wetting front migration distance and cumulative infiltration during biogas slurry hole irrigation, the hole parameters of biogas slurry hole irrigation and crop irrigation amount were optimized, and an economical and efficient biogas slurry irrigation system was designed. The HYDRUS-2D model and the measured soil characteristic parameters were used to construct and verify the soil movement model of biogas slurry hole irrigation. The results showed that the cumulative infiltration and wetting front migration distance simulated by the HYDRUS-2D model closely matched the laboratory test results (NSE>0.966, PBIAS≤±0.3). Soil cumulative infiltration and wetting front migration distance decreased with the increase of biogas slurry ratio and increased with the increase of hole diameter and depth. The lateral and vertical migration distances of the wetting front exhibited a strong power function relationship with the stable infiltration rate and infiltration time (R2≥0.977). The wetting front curve could be accurately represented by an elliptic curve equation (R2≥0.957), and soil cumulative infiltration under biogas slurry hole irrigation demonstrated a linear relationship with the wetted body area (R2≥0.972). The established model for the wetting front migration distance model (NSE>0.976, PBIAS≤±0.13) and cumulative infiltration model (NSE>0.982, PBIAS≤±0.10) exhibited good reliability, accurately describing the impact of variations in biogas slurry hole irrigation parameters. This provides a theoretical basis for determining appropriate parameters and irrigation volumes for biogas slurry hole irrigation. |
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