|
Abstract The aims of this study were to quantitatively measure the spatial distribution structure of regional landslides，to reveal the differences and causes of distribution patterns between regional landslides of different sizes. The diameter of a landslide was graded into classes(scales) according the data from the database of Loess landslides. The spatial distribution structure and causes of loess landslides on various scales of diameter were quantitatively analyzed with the methods of the correlated fractal dimension，the kernel density and the GIS spatial analysis. The loess landslide with the diameter within the scale of 50–75 m occupied the maximum proportion，comprising 28.87% of the total landslides. The landslide on the scale larger than 100 m was the least which accounted for 15.12%. The spatial structure of landslide on various scales had multi-fractal characteristics. There was a distinct inflection point on the scale of 30 km. On the scale smaller than 30 km，the correlated fractal dimension was raised with the increase of diameter scale，and the distribution pattern was turned from the aggregation into the dispersion pattern gradually. On the scale larger than 30 km，the distribution of regional landslide exhibited an aggregation pattern. The loess landslides were mostly affected by topography and landforms during its process of development. Among selected 3 major factors influencing the distribution patterns，the distance to river stream was the most influential factor followed by the relief amplitude. A higher proportion of the landslide with small diameter scale was found to take place near the stream with smaller relief amplitude. However，a larger proportion of the landslide with large diameter scale occurred at the places with larger relief amplitude and far away from river. Slope had negligible effect on the distribution pattern.
|
|
Received: 23 April 2014
|
|
|
|
2015, Vol. 34 
