Extraction Of Geomorphic Features Of Steppe And Near-natural Reshaping Of Inner Dump

As an important disturbance of human activities to the natural environment,openpit mining has the problems of regional hydrological characteristics loss and serious landscape fragmentation in its inner dump.The construction of a stable landform with high integration between the inner dump and the natural landscape plays a key role in land reclamation and ecological reconstruction in the mining area.Based on the theory of near-natural landform reshaping,in order to the inner dump of Shengli No.1 Openpit Coal Mine as the research object,by studying the steppe natural landscape and the regularity of channel morphological characteristics,establish landform reshaping the earthwork optimization techniques,on the basis of studying natural topographical features application,the near-natural landform reshape on coal mine inner dump based on Geo Fluv model,and the different geomorphic evolution simulation and reshape the landscape of stability evaluation.The main conclusions are as follows:(1)According to the topographic factor characteristics of the natural areas in the study area,three stable geomorphic areas under different slopes were selected as the natural learning samples.The slope profile was extracted from the natural slope in the steep slope and gentle slope area,and the anti-S type slope models were established respectively on the basis of statistics and analysis of the slope characteristic parameters.The anti-water erosion ability of the anti-S type slope model and the original dump slope model at different heights was compared by WEPP model.The results show that the soil and water conservation capacity and long-term stability of the anti-S type slope model are better than that of the original dump slope.This model can be used as the design scheme of the pre-surface in the topographic remolding of the dump in the mining area,and provide the parameter basis for the optimization design of the earthwork in the near-natural landform reshaping.(2)The channel in the natural learning area was extracted by the Geo Net component.On this basis,the geomorphic critical model of the study area was constructed by statistical analysis of the slope slope and the catchment area above the slope head,and the influence of the surface runoff process on the slope morphology was analyzed.The results show that the channel density is 21.83m/ha in the steep slope area,24.63m/ha in the gentle slope area,and 30.07m/ha in the micro-slope area.The relative shear force index of the geomorphic critical model is 0.899,and the critical constant is 0.1081.By analyzing the influence of surface runoff process on slope morphologic evolution,three characteristic parameters were obtained and the values of the characteristic parameters in natural areas were counted,which provided a data basis for the subsequent landform reshaping of the channel parameters.(3)According to the technical route of landform reshaping,the near-natural landform reshaping in the study area was carried out on the basis of learning the natural areas,and the stability of different reshaped geomorphic was evaluated according to the geomorphic evolution model.By calculating the optimal range of vegetation coverage of the dumps in the study area,vegetation parameters were provided for the subsequent geomorphic evolution simulation.Based on the study of the topographic and hydrological features of the natural region mentioned above,the geomorphological parameters were extracted and reconstructed.Based on the research of earthwork optimization technology of inner dump,the near-natural landform of earthwork balance is constructed as the base data.Based on Geo Fluv,the landform reshaping natural parameters were used to remodeling the near-natural reshape of the inner dump.On this basis,the geomorphological evolution of natural landform,traditional landform and near-natural reshaped landform were simulated for 100 years according to the CLIDE model.The results show that the near-natural landform have much better anti-erosion ability and water and soil conservation ability than the traditional landform,and can be used as the suitable scheme for the geomorphologic reshaping of inner dump.There are 36 figures,7 tables and 94 references in this paper.