福建省崩岗侵蚀的地质地貌背景分析

为探讨福建省崩岗侵蚀的地质地貌背景,从而为崩岗侵蚀防治提供依据,作者运用GIS技术,将福建地质图和数字高程模型(DEM)等地质地貌因子经过处理后与福建省崩岗分布图进行叠加分析,结果表明:在地质构造上,崩岗主要发育在断裂带上,且分布在不稳定区域内;崩岗主要发育在易风化的花岗岩母岩上;从地貌背景来看,崩岗主要分布在海拔高度为100~800m的丘陵和低山地区,并且与相对高程密切相关,主要集中在坡度为10~25°的斜坡和陡坡地区,特别是15~25°的陡坡区,具有坡向选择发育的规律,多分布于向阳坡或半阳坡的位置。

Background Analysis on the Geology and Land Form of Clo lapse Erosion in Fujai n Province

The essay is to probe into the geology and land form background by the collapse erosion in Fujian Province so as to provide the evidence for the collapse prevention. The analysis was conducted by overprinting the geological and land form factors in the Geological map of Fujian Province and DEM after the treatment together with the Collapse Distribution Map of Fujian Province. The results showed that,in terms of the geological structure,the collapse mainly developed on the fault zone and distributed in the unstable areas. Collapse mainly developed on the easily weathered granite bedrock. In terms of the land form background,collapse mainly distributed at the hills and low mountains with the altitude between 100 m to 800 m,closely related with the relative elevation. The collapse concentrated at the slope and steep slope with the degree between 10 to 25 degrees,especially at the steep slope between the 15 to 25 degrees.With the rules of slope selection development,the collapses mostly distributed at the sunny or half sunny slopes.