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Trends in gully erosion as evidenced from repeat photography (North Ethiopia)

Frankl A., Nyssen J., De Dapper M., Haile M., Deckers J., Poesen J.

Landform Analysis

2011

Vol. 17

47-50

Repeat photography offers a valuable tool for assessing gully erosion development over the past 140 years in North Ethiopia. From a dataset of 57 repeated historical photographs that display gully cross-sections, this study demonstrates that a gully incision phase took place in the second half of the 20th century. At present, thanks to the successful implementation of soil and water conservation measures, most gullies are stabilizing.

Repeat photography: a useful tool for understanding short-term geomorphological dynamics in Nepal Himalayas

Fort Monique

Studia Geomorphologica Carpatho-Balcanica

2019/2020

Vol. 53/54

33--58

The Himalayan Range is subject to both tectonic forces and climatic variations, each operating on different time scales, as observed in Nepal. Through the use of repeated photos, we try to illustrate some examples of very rapid geomorphological evolution, especially over the last 10 years, showing both the intensity of the processes in action (landslides, floods) and their potential impacts on inhabited areas and infrastructures under construction. We selected four sites from the middle Kali Gandaki valley (Annapurna–Dhaulagiri Himal) where frequent natural hazards are threatening the two-lane highway under construction, and two more sites in the south of the Everest massif to illustrate the changes brought about by the last 2015 earthquake.