| Taking Shanxi Jinzhong basin and Yunnan Gejiu basin as examples,the landscape pattern,regional crustal stability and geological disaster coupling structure of typical mountain basins are studied.For typical mountain basin landscape planning,ecological restoration,project site selection and disaster prevention,it has a positive meaning.Based on the method of tectonic lithofacies,this paper studies the landscape pattern and stability evolution of the Jinzhong and Gejiu basins from 1980 to 2020,and analyzes the relationship between the regional crustal stability and geological disasters in the Jinzhong and Gejiu basins.Qualitative analysis+quantitative evaluation is carried out,and then the susceptibility of geological disasters is divided,and disaster prevention suggestions are put forward.Finally,the relationship between regional crustal stability and landscape pattern stability is discussed.The main research results are:(1)After 2000,the stability of the landscape pattern in the Jinzhong Basin declined sharply.The fragmentation of woodland and grassland in the erosive middle-low mountain bedrock landscape area intensified,and the construction land in the mountain open flow basin landscape area continued to be distributed in clusters.On the contrary,the Gejiu basin dropped sharply before 2000 and rebounded slightly after2000,indicating that the Gejiu mine’s production is developing towards green and sustainable development.(2)Coupled with rock and soil structure,fractures and topography,it is qualitatively considered that the basin-mountain transition zone in the Jinzhong Basin is a region of regional crustal instability,and the types of geological disasters are mainly ground fissures and land subsidence;Yungui in Gejiu area The original landscape areas of the second and third grade karst platforms on the southeastern margin of the plateau are regions of regional crustal instability,and the main types of geological disasters are ground collapse and ground fissures.(3)Using a series of internal and external dynamic factors to quantitatively reveal that the crustal stability in the northern Jinzhong basin is dominated by sub-stable areas,accounting for 44%of the area,and the susceptibility of geological disasters is dominated by the moderately prone areas.The proportion is 46%,which is the key disaster prevention area;in the Laochang mine field,the karstification is dominated by strong areas,accounting for 34%of the area,and the regional crustal stability is dominated by sub-unstable areas,accounting for the area.It is 65%.The susceptibility of geological disasters is mainly in the middle-prone area,covering an area of 83km~2,accounting for 53%.(4)The coupling structure of landscape pattern and geological hazard reveals:the landscape pattern in the northern Jinzhong basin promotes the stable development of the landscape area of the basin-mountain transition zone,and promotes the unstable surface development of the landscape area of the open-flow basin between mountains,which is more erosive.The surface stability of the bedrock landscape area in the middle and low mountains can both promote and reduce.The landscape pattern of the Gejiu karst landscape area promotes the stability of the surface of the area to develop in an unstable direction. |
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