School of Public Policy & Manage, China University of Mining & Technology
Engineering Research Center of Ministry ofEducation for Mine Ecological Restoration, China University of Mining & Technology

The landform of the inner dump in the grassland open-pit coal mine is affected by factors such as the shapingmethod and the amount of earthwork in the mining-dumping-reclaiming activities, and it faces ecological and environmentalproblems such as landscape fragmentation and soil erosion. Based on the existing technologies and the team'sachievements, in order to further realize the integration of the reshaped landform and the surrounding hydrology in themining area, an optimization model for the delineation of the mining complex sub-area based on the hydrological preservationsurface (HPCS) was constructed. Taking the inner dump site in the Heishan open-pit coal mine in Xinjiang as an example, the optimized near-natural design landform under HPCS (MNNDL_HPCS) was used as the experimental group,and the NNDL_HPCS, the original natural landform (PNL) and the traditional design landform (TDL) were used as thecontrol group. Combined with spatial superposition analysis and geomorphological evolution simulation technology, theoptimization effects of the MNNDL_HPCS in hydrological integration, earthwork allocation and soil water erosion resistancewere evaluated. The result shows: ① in the delineation of the mining sub-area, except for the adjustment of the locationof the mining sub-area in the MNNDL_HPCS, the positions of the rest of the areas remain unchanged. ② Comparedwith hydrological fusion, with the PNL as the benchmark, the MNNDL_HPCS has the best visual effect. Specifically, thespatial overlap rate of hydrological channels is 52.84% higher than that of the NNDL_HPCS and 66.66% higher than thatof the TDL; the index of hydrological fusion rate is 7.04% higher than that of the NNDL_HPCS and 18.11% higher thanthat of the TDL. ③ Compared with earthwork deployment, the average earthwork distance of the MNNDL_HPCS isabout 0.98 m/m3 shorter than that of the NNDL_HPCS, and about 4.93% higher than that of the TDL. Therefore, the earthmoving cost is slightly lower than that before optimization. ④ Comparing soil water erosion resistance, theMNNDL_HPCS can reduce the total amount of soil water erosion by about 31.65%, 56.86% and 80.59% over 10 yearscompared with the PNL, NNDL_HPCS and TDL, respectively. In addition, the average slope mitigation (0.28°) is themain reason why the soil water erosion resistance of the MNNDL_HPCS is better than that of the PNL, which is realizedby the slope mitigation optimization module in the HPCS model. The research results can restore the original runoff channelsand original landforms and landscapes in the mining area to the maximum extent, improve the stability of ecologicalrestoration in the mining area.

国家自然科学基金新疆联合基金资助项目(U1903209)；国家重点研发计划资助项目(2016YFC0501107)；国家科技基础性工作专项资助项目(2014FY110800)

夏嘉南，李根生，李园园，等. 水文融合的草原露天矿内排土场地貌重塑优化[J]. 煤炭学报，2023，48(4)：1673−1686

XIA Jianan，LI Gensheng，LI Yuanyuan，et al. Landform reshaping optimization of inner dump based on hydrological fusion in grassland open-pit coal mine[J]. Journal of China Coal Society，2023，48(4)：1673−1686