巢湖流域地形起伏度及其与人口分布的相关性研究

The Relief Degree of Land Surface and Its Correlation with Population Distribution of Chaohu Watershed

地形起伏度描述了某一范围内地形的起伏状况,是影响人口分布的重要因子之一。以Arcgis 10.0为数据处理平台,以分辨率为90 m×90 m的SRTM DEM为基础数据,采用邻域统计分析法,提取了巢湖流域不同分析窗口下的地形起伏度;然后运用均值变点法确定巢湖流域的最佳分析窗口,分析了巢湖流域最佳分析窗口下的地形起伏度的分布特点;并探讨了地形起伏度与人口分布的相关性。结果表明:1以90 m×90 m的SRTM DEM为基础数据下的巢湖流域地形起伏度的最佳分析窗口为11×11窗口单元;2巢湖流域地形起伏度介于0"701之间,整体趋势为以平坦为主,西高东低、南高北低,中部巢湖区域较低;3巢湖流域地形起伏度与人口密度呈显著负相关,其幂数拟合曲线拟合度为0.682。

The relief degree of land surface（ RDLS） is an important factor in describing the landform macroscopically of special region,and also is one of the key factors in influencing population spatial distribution. So,exploring the RDLS of Chaohu watershed and its correlation with population distribution can not only reflect the topography situation,but also can provide reference for residential environmental evaluation. Based on the 90 m resolution SRTM DEM data,by using Arcgis10. 0 software,the relief of different neighborhood windows with the neighborhood statistics analysis method was firstly extracted. Then,the best analysis window was calculated by using the mean change-point analysis method. Finally,the discipline of the relief degree of land surface and its relationship with the distribution of population in Chaohu watershed was analyzed systematically. The study has shown that：1 the 11 × 11 grid unit was the best analysis window for extracting the relief amplitude in Chaohu watershed based on the 90 m resolution SRTM DEM data. 2 The relief degree of land surface in Chaohu watershed is dominated by plains,which value lies between 0 and 701,with western areas higher than the east,and northern areas lower than the south. The relief degree of land surface of Chaohu is dominated by low value. 3 The RDLS with power fitting curve of population density fitting degree was 0. 682,and showed a significant negative correlation.