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近年来,全国各省市陆续在开展1/5万地质灾害调查工作,不同地貌区地质灾害发育情况不同,调查方法与要求亦有区别。平原岗丘地区往往存在地质灾害点达不到观测点数量要求,需要增加地质环境点来满足精度;而西南高山区灾害点少但规模大,许多灾害点往往要通过大比例尺的测绘才能调查清楚。相比之下,低山丘陵地区地质灾害点具有点多面广的特点,规模多为小型,调查任务艰巨。本文以江西省定南县为例,阐述低山丘陵地区1/5万县(市)地质灾害调查的技术方法与认识,以期对类似地区的调查有所帮助。
In recent years, all provinces and municipalities in China successively carried out 1/5 million geological disasters investigation work. The development of geological disasters in different topography areas is different, and the survey methods and requirements are also different. There are often geological disasters in the hilly area of the plain that can not meet the requirements of the observation points, and geological environment points need to be increased to meet the accuracy. However, the disasters in the southwest mountainous areas are small but large in scale, and many disaster sites are often surveyed through large-scale mapping . In contrast, geological disasters in hilly areas have a wide range of point characteristics, the scale of small and more difficult task of the investigation. This paper takes Dingnan County of Jiangxi Province as an example to illustrate the technical methods and understanding of geological hazards survey in 1/50000 counties (cities) in hilly areas, with a view to helping the investigation in similar areas.