Talus movement in the high equatorial andes: A synthesis of ten years of data
Abstract The surficial movement of debris was monitored on a talus cone in the Venezuelan Andes for about a decade. The talus surface was classified into three textures (blocks, pebbles, sand). Painted stones were placed along four transects perpendicular to the slope; many markers (≈︁ 36%) were los...
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crwiley:10.1002/ppp.3430040303 2024-09-09T20:03:24+00:00 Talus movement in the high equatorial andes: A synthesis of ten years of data Pérez, Francisco L. 1993 http://dx.doi.org/10.1002/ppp.3430040303 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.3430040303 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.3430040303 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 4, issue 3, page 199-215 ISSN 1045-6740 1099-1530 journal-article 1993 crwiley https://doi.org/10.1002/ppp.3430040303 2024-06-20T04:25:14Z Abstract The surficial movement of debris was monitored on a talus cone in the Venezuelan Andes for about a decade. The talus surface was classified into three textures (blocks, pebbles, sand). Painted stones were placed along four transects perpendicular to the slope; many markers (≈︁ 36%) were lost, mostly in pebble and sand areas, owing to burial. Mean stone movement decreased downslope, being much lower on the talus base (33.8 cm) than on the lines above (157.9, 239.9 and 107.8 cm). Tracers on blocks shifted a shorter distance (36.9 cm) than those on either pebbles (152.3 cm) or sand (225.1 cm). A regression showed that annual movement rates on 46 plots were inversely correlated with mean particle size (r=−0.878). An ANOVA indicated that the difference in rates between textures was more significant than that found between slope positions. Markers below outcrops also moved less than those on open talus. A line painted on the rockwall at the talus apex showed alternate periods of debris erosion and accretion, with an overall drop of 22.2 mm of the talus surface during a period of 11.5 years. Rates of debris movement vary substantially between talus textures because these are affected by different transport processes. Mean rates of debris movement remained essentially erratic during the study period, showing no consistent trends through time. Article in Journal/Newspaper Permafrost and Periglacial Processes Wiley Online Library Permafrost and Periglacial Processes 4 3 199 215 |
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Open Polar |
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Wiley Online Library |
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language |
English |
description |
Abstract The surficial movement of debris was monitored on a talus cone in the Venezuelan Andes for about a decade. The talus surface was classified into three textures (blocks, pebbles, sand). Painted stones were placed along four transects perpendicular to the slope; many markers (≈︁ 36%) were lost, mostly in pebble and sand areas, owing to burial. Mean stone movement decreased downslope, being much lower on the talus base (33.8 cm) than on the lines above (157.9, 239.9 and 107.8 cm). Tracers on blocks shifted a shorter distance (36.9 cm) than those on either pebbles (152.3 cm) or sand (225.1 cm). A regression showed that annual movement rates on 46 plots were inversely correlated with mean particle size (r=−0.878). An ANOVA indicated that the difference in rates between textures was more significant than that found between slope positions. Markers below outcrops also moved less than those on open talus. A line painted on the rockwall at the talus apex showed alternate periods of debris erosion and accretion, with an overall drop of 22.2 mm of the talus surface during a period of 11.5 years. Rates of debris movement vary substantially between talus textures because these are affected by different transport processes. Mean rates of debris movement remained essentially erratic during the study period, showing no consistent trends through time. |
format |
Article in Journal/Newspaper |
author |
Pérez, Francisco L. |
spellingShingle |
Pérez, Francisco L. Talus movement in the high equatorial andes: A synthesis of ten years of data |
author_facet |
Pérez, Francisco L. |
author_sort |
Pérez, Francisco L. |
title |
Talus movement in the high equatorial andes: A synthesis of ten years of data |
title_short |
Talus movement in the high equatorial andes: A synthesis of ten years of data |
title_full |
Talus movement in the high equatorial andes: A synthesis of ten years of data |
title_fullStr |
Talus movement in the high equatorial andes: A synthesis of ten years of data |
title_full_unstemmed |
Talus movement in the high equatorial andes: A synthesis of ten years of data |
title_sort |
talus movement in the high equatorial andes: a synthesis of ten years of data |
publisher |
Wiley |
publishDate |
1993 |
url |
http://dx.doi.org/10.1002/ppp.3430040303 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.3430040303 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.3430040303 |
genre |
Permafrost and Periglacial Processes |
genre_facet |
Permafrost and Periglacial Processes |
op_source |
Permafrost and Periglacial Processes volume 4, issue 3, page 199-215 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.3430040303 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
4 |
container_issue |
3 |
container_start_page |
199 |
op_container_end_page |
215 |
_version_ |
1809935350230941696 |