Exploration and thinking on soil erosion effect of coal mining subsidence area in the upper and middle reaches of the Yellow River

SONG Shijie; ZHANG Jiajie; YANG Shuai; LIU Zhijian; JIANG Ning; CHEN Ping; LIU Hanbin; WEI Jiangbo; LIU Lu; CHEN Baodeng; LI Yuanhong

Abstract：Solving the contradiction between coal mining and soil and water conservation is a major scientific issue and strategic demand for ecological protection and high-quality development in the upper and middle reaches of the Yellow River.On the basis of systematically combing the relevant research progress,it is pointed out that insufficient under-standing of the regional characteristics of coal mining subsidence areas,incomplete understanding of the key factors of soil erosion in the process of coal mining subsidence,lack of research on soil erosion effect of different mining dam-age types in coal mining subsidence areas are the main problems in the research of soil erosion effect and prevention and control in coal mining areas in China.The sharp contradiction and development trend between coal mining and soil and water conservation in the seven national coal bases in the upper and middle reaches of the Yellow River are analyzed.The focus of the contradiction is mainly manifested in:first,the high overlap between the coal mining con-centration area and the key control area of soil and water loss leads to the double pressure of energy security supply and soil and water loss prevention;second,the background of regional natural soil erosion leads to a small and difficult space to solve the contradiction between coal mining and soil and water conservation.Third,the continuously expanding coal mining subsidence area during the 14 th Five-Year Plan period will become the main battlefield for soil and water conservation.It is proposed that the spatial and temporal evolution law and mechanism of soil erosion under the coupling of underground mining+underground overburden+surface natural micro-topography,the soil ero-sion effect of different damage types and the spatial and temporal evolution law and mechanism,and the key technology system of precise prevention and control of soil erosion in the whole life cycle under the strategy of underground joint surface are the key research directions for the prevention and control of soil erosion effect in the coal mining subsid-ence area in the upper and middle reaches of the Yellow River in the future.It is hoped to provide a useful reference for solving the contradiction between coal mining and soil and water conservation in the upper and middle reaches of the Yellow River and supporting the ecological protection and high-quality development of the upper and middle reaches of the Yellow River.