地形起伏度提取及其在区域滑坡灾害评价中的应用——以四川省为例

The Extraction of Relief Amplitude and Its Application in the Regional Landslide Hazard Assessment

四川省位于我国西南部,省内地形地貌复杂多样,地势高差大,汶川—茂江、北川—映秀等几条大的断裂带广泛分布,地壳构造不稳定,地质灾害频繁发生,其中尤以滑坡灾害较为典型。滑坡灾害的发生与地形有着密切关系。探讨了四川省地形起伏度最佳统计单元的求证过程,经试验得出,2.25 km2为适宜四川省滑坡发育的地形起伏度计算的最佳单元。基于ArcGIS平台,结合区域滑坡灾害调查资料,初步研究了地形起伏度与滑坡灾害的相关性,并用信息量模型进行验证,在该基础上探讨了地形起伏度与区域滑坡灾害发生的规律,对区域防灾减灾具有重要的指导意义。

Sichuan Province is in the southwest of China,its terrain and landscape are complex and diverse,and the relief is large.Fracture zones like Wenchuan-Maojiang and Beichuan-Yingxiu are widely distributed and the tectonic is instability.On account of the reasons above,geological disasters happen frequently.Among all the disasters,the landslide hazard is very typical.The occurrence of landslides is closely related with the terrain.The verification process of the best statistical unit of the relief amplitude in Sichuan Province is discussed,according to the experiment results,2.25 km2 is the best unit for calculating the relief amplitude during landslide occurrence.Based on the ArcGIS platform,and combining with regional landslide hazard survey,the relationship between landslide hazard and relief amplitude is studied preliminary,and the information amount model is verified.At last,the occurrence law of regional landslide hazard and relief amplitude is discussed,which is of great guide significance in regional disaster prevention and mitigation.