جستجوی مقالات مرتبط با کلیدواژه "geomorphic hazards" در نشریات گروه "آبخیزداری، بیابان، محیط زیست، مرتع"

Neotectonic activity plays an important role in increasing the occurrence of landslides. The purpose of this study is to investigate the relationship and the extent of landslide occurrence from active tectonics in the Kheirabad River Basin River. For this purpose, neotectonic activity in four sub-basins of this river and based on six morphotectonic indicators; V/A, Bh, P, BR, Ff, and Tf were calculated. The mentioned indices were extracted in each sub-basin using Arc GIS 10.4 software and digital elevation model (DEM 10 M) as well as the Archydro plugin. Each index was divided into three categories in terms of tectonic activity, and finally, based on the segmentation of each index, the level of tectonic activity of the region was determined on the basis of the index of relative tectonic activity index (Iat). And the area of the study was divided into 3 categories. The results showed that neotectonic activity is very high in Shahbahram sub-basin and high tectonic activity in Dehdasht and Sarpari sub-basins and low tectonic activity in Kheirabad sub-basin., Finally, by cross overlaying of the landslide inventory map to the relatively active tectonic zonation map, the percentage of landslides that occurred in each tectonic region and the role of active tectonics in landslide occurrence was determined. The results showed that 74.69% (587.75 ha) of landslides occurred in the area with high tectonic activity, which covers only 33.11% of the total area of the study basin. Accordingly, 199.09 hectares of landslides occurred in areas with moderate and low tectonic activity, which constitutes more than 66/89% of the total basin. This distribution indicates the dependence of the landslide occurring with active tectonics, in other words, the role of active tectonics in the occurrence of landslides.

Landslide is one of the natural hazards in watersheds that cause a lot of damage every year. Neotectonic activity plays an important role in increasing the occurrence of landslides. The purpose of this study is to investigate the relationship between active tectonics and landslide inventory using morphotectonic indices in the ​​Fahlian River Basin. For this purpose, landslides distribution in the region were first mapped out and stored with the help of Google Earth images, LANDSAT-8 images, aerial photographs and field visits. Next to the extraction and calculation of four morphotectonic indices; volume to basin surface index (V/A), bifurcation index (BR), surface canal density index (P) and relative relief index (Bh). Morphotectonic indices were measured in each sub-basin. Preparation of these indicators has been done using topographic and geological maps, satellite images, field visits and using geometric and mathematical principles with the help of the features available in ArcGIS10/4. Each index was divided into three categories in terms of tectonic activity, and finally, based on the segmentation of each index, the level of tectonic activity of the region was determined on the basis of the index of relative tectonic activity index (Iat). Finally, by cross ovrlaying of the landslide inventory map to the relatively active tectonic zonation map, the percentage of landslides occurred in each tectonic zone was determined. The results showed that 67.34% (428.34 ha) of landslides occurred in the area with high tectonic activity, which covers only 45.73% of the total area of ​​the study basin. This result indicates the role of active tectonics in increasing landslide occurrence.