Abstract: In this paper, a digital elevation model (DEM) for the Dagujia River basin in Shandong Peninsula was created by 3S techniques, and the precipitation in this basin was calculated by interpolation method. Nine factors, including population, GDP and land use type that reflected human activities, and precipitation and air temperature that reflected climate changes, were adopted to analyze their effects on the runoff in the basin by using association analysis and principal component analysis (PCA). The results of association analysis showed that precipitation, woodland and orchard had significant correlation with runoff. The PCA results indicated that population, cropland, orchard, woodland and water land that reflected human activities were the major affecting factors of runoff, and their cumulative proportion reached to 73.96%. Precipitation was the second major factor of runoff, and its cumulative proportion reached to 11.38%.

Key words: Ecological spatial data, Simulation methods, Display formats