| China is located in the Himalayan tectonic belt and circum-pacific tectonic belt, plate movementaffected, the geological structure is complicated and diverse terrain from west to east, mainly inmountainous and hilly terrain, many species of Geologic Disaster.On the spatial distribution ofgeological disasters render sheet, depending on its location is divided Eastern, Central and WesternDistrict three major disasters area.Southwest disaster affected areas extensively developed karst topography, Geologic structuralcomplexity, surface rough, thin soil and the distribution of concentration, the increasingly tenserelationship between human and other factors, lead to over-exploitation of land, vegetation, soilerosion, accelerated the rocky land，Spring and summer storm makes topsoil weight increase,exacerbating the occurrence of landslides and other geological disasters, resulting in varyingdegrees to the area of economic loss and some casualties. With the advance of urbanization inrecent years, led to the rapid development of the degree of development rocky, the pace ofdevelopment of geological disasters in the southwest region, the number and intensity increasedyear by year, has seriously affected the local ecological environment, social and economic can besustainable development.Guizhou Province is located in the southwest karst region of central location, karst widespread.Under multivariate geology and geomorphology, meteorology, hydrology, lithology, seismic,hydrogeological features and human activities affect each other, leading to the landslide disaster inGuizhou Province-based geological disasters, has seriously hampered the development of the localeconomy and the personal rate life and property safety. Therefore, Guizhou Province, the regionaldistribution of spatial and temporal landslide hazard research and analysis.Firstly, from both natural factors and human activities in terms of the mechanism of landslidehazard in Guizhou Province are analyzed, and then combine the study area over the years,information and calendar data landslide Statistical Yearbook, plotted using Arcview software.Through the distribution of landslide hazards in different time scale trends, summarized in Guizhoulandslide disaster time, through drawing on the geographical location of each disaster points,summarized in Guizhou landslide disaster spatial distribution.Finally, faced with landslides have occurred in the scale of the disaster were analyzed from the landslide deaths and direct economiclosses tripartite summed distribution of landslide disaster in Guizhou Province.Thus Guizhoulandslide disaster prevention, exploitation of mineral resources, infrastructure and environmentalprotection and other aspects play a substantial role in guiding the planning, but also on thewidespread karst areas landslide hazard study has some reference value.The main contents of this paper include the following aspects:(1) Guizhou landslide disaster hazard elaborate mechanism of natural factors and human activitiesfrom both. Natural factors were analyzed from meteorological and hydrological, geological features,lithology, earthquake, five hydrogeological characteristics. Human activities are mainly from rapidurbanization, mining activities, agricultural activities and over-exploitation of groundwater in fourareas analyzed.(2) Through1940-2005, the number of geological disasters in various types of disaster occurrencestatistical analysis, the current situation of geological disasters in Guizhou province (the proportionof the various geological disasters), accounting for about55%of the total number of landslides,avalanches of22%, mudslides and9%, so the type of geological disasters in Guizhou landslidehazards based.(3) Through65years statistical landslide occurred, the season and the month and other data, drawnwith time excel software landslide distribution map drawn by the chart analysis time of landslidedistribution in Guizhou Province. Interannual trends in Guizhou landslide disaster occurred as earlysmall, medium gradually increased, a significant increase in the late. Seasonal variation of landslidedisasters are mainly concentrated in the spring and summer, less in autumn, winter minimum.Monthly variation of landslide hazard landslide disaster is the highest number for the month of July,concentrated in6-8months,4-5and8-10months period of moderate occurrence, and1-3months,11-12months low incidence of landslide.(4) According to65years landslide hazard location latitude and longitude drawing space, thussummed Guizhou landslide disasters distribution space for less Cistercian East, South, North andmore less. Distribution point landslide occurred more concentrated, the highest number is theTongren area, the average number of occurrences of4.06times a year followedQianxinan,Anshun,the total occurrence least, accounted for only1.5%of the total.(5)Analysis of Guizhou landslide disasters in the years to scale landslide occurred, the number ofdeaths and direct economic losses for the evaluation of three.Dominated by small-scale landslide, Deaths (including missing) caused by landslides over the years,the proportion of small andmedium-based disaster level display, about84%,The level of direct economic losses are mainlysmall-scale. |
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