The Analysis On Landslide To The Status Of Settlement Based On GIS And RS In Lixian

The landslide has been one of the most serious natural disasters in the world,which has brought incalculable losses to social and economic development and daily work life.As one of the most important natural disasters,it is closely related to the life and property of the people.In this paper,based on remote sensing and geographical information technology,to a large of the upper reaches of Zagunao River which is a branch of Minjiang River as the study area,from the spatial distribution of settlements and landslides and the landslide vulnerability of settlements,through these two aspects made the following conclusions:(1)The distribution pattern of the settlement in the upper reaches of minjiang river is mainly dominated by the strip distribution of the valley,and scattered in some high mountain areas on both sides of the river valley.Landslide distribution of a large scale and elevation of the upper reaches of minjiang river each are not identical,mainly distributed in the area in 1422-2500 meters altitude,the distribution of settlement in this area accounted for 78.25%of the total landslide hit lixian.Settlements are mainly concentrated in valley town called Gan Bao Xiang,Za Gu Nao,Mu Ka Xiang and Tao Ping.A large landslide distribution reflects and the general consistency of settlements,the elevation 1422-2500 m area,the area accounted for 58.3%of the total landslide,the second is the region of 2500-3500 meters high,accounting for 40.97%of the total.The landslide is mainly concentrated in the town of Za Gu Nao Valley,Gu Er Gou Town and Pu Tou Town.(2)Respectively from the relationship between landslide elevation and the elevation of settlements,the position of landslide and the correlation of settlement of the location,the landslide area and the area of the correlation of three respects of settlements of Li Xian on the spatial distribution of landslide.In settlement area and landslide area distribution from 0 to 5×10~4?landslide distribution of settlement area between 0-4×10~4?with landslide size exponential function distribution;For landslide size within the range of 5×10~4?to 22×10~4?area and the scope of distribution of settlement mostly within the scope of 1×10~4?to 2×10~4?.The curve fitting graph of landslide latitude and settlement latitude shows that the plane distribution relationship of landslide and settlement is roughly a function distribution.As for the large curvature curve of the elevation between 1600m to 2500m,which is close to proportional function,the landslide and settlement are mostly distributed in this interval.The curve shows a fluctuating relationship between 2500 to 3600 meters,and the distribution number is lower than that between 1600 to 2500 meters,and the number of landslides and settlements in the area between 2500 to 3000 meters is more than 3000 to 3600 meters.(3)From the study of hazard-affected body and hazards to make a vulnerabilityassessment.Theassessmentresultsarehierarchiestoget distribution map of a large landslide density,population,economic and ecological vulnerability,finally calculate the three to get comprehensive vulnerability distribution map.From the economic loss of the settlement,this paper analyzed the landslide impact on the settlement of the status quo.The vulnerability is divided into four levels,and the areas with the highest vulnerability are in the Mu Ka Town,Mi Ya Luo Town,Za Gu Nao Town and Gu Er Gou Town.Through the analysis of the influence of landslide on settlement,the research results can be more scientific for the prevention,treatment and settlement of landslide,and it is of great significance to the sustainable development of mountain settlements.