Dynamic changes in the lower Gállego River (Ebro Basin, NE Spain) and their relationship with anthropic activities and the quaternary substrate
The lower Gállego River has been strongly degraded since the 1960s due to human activity (gravel mining, dump accumulation, channeling works), which has produced a deep channel incision. Although these human-driven processes are usually reported in fluvial bibliography, in this case, more complex re...
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| Format: | Article |
| Language: | English |
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Universidad de La Rioja
2020-09-01
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| Series: | Cuadernos de Investigación Geográfica |
| Subjects: | |
| Online Access: | https://publicaciones.unirioja.es/ojs/index.php/cig/article/view/4409 |
| _version_ | 1818294900233338880 |
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| author | J.L. Peña-Monné L.A. Longares-Aladrén V. Rubio-Fernández M.M. Sampietro-Vattuone M. Sánchez-Fabre |
| author_facet | J.L. Peña-Monné L.A. Longares-Aladrén V. Rubio-Fernández M.M. Sampietro-Vattuone M. Sánchez-Fabre |
| author_sort | J.L. Peña-Monné |
| collection | DOAJ |
| description | The lower Gállego River has been strongly degraded since the 1960s due to human activity (gravel mining, dump accumulation, channeling works), which has produced a deep channel incision. Although these human-driven processes are usually reported in fluvial bibliography, in this case, more complex results are observable. For instance, regarding the depth and incision rates, we observed no relationship between the most anthropically impacted areas and the sections with the deepest incisions; moreover, the deepening process continues 40 years after the human interventions ceased. The reason for this maladjustment is the role played by the exhumation of the underlying Pleistocene substrate, affected by the synsedimentary processes of karstification. The appearance of paleodolines filled with fine sediments on the incision bottom and sides is the main factor conditioning the continuity and magnitude of the process. Besides, these paleodepressions direct the river dynamics and course, thus favoring its widening when they appear and causing the development of a new riverbed (Qt13) while the 1960s floodplain (Qt12) is becoming an old terrace located between 5 and 11 m above the new alluvial bottom. There are no previous records about this kind of consequences in the regional fluvial dynamics. |
| first_indexed | 2024-12-13T03:39:05Z |
| format | Article |
| id | doaj.art-763379d30407478aafd67b790be0022b |
| institution | Directory Open Access Journal |
| issn | 0211-6820 1697-9540 |
| language | English |
| last_indexed | 2024-12-13T03:39:05Z |
| publishDate | 2020-09-01 |
| publisher | Universidad de La Rioja |
| record_format | Article |
| series | Cuadernos de Investigación Geográfica |
| spelling | doaj.art-763379d30407478aafd67b790be0022b2022-12-22T00:00:58ZengUniversidad de La RiojaCuadernos de Investigación Geográfica0211-68201697-95402020-09-0146237139310.18172/cig.44093453Dynamic changes in the lower Gállego River (Ebro Basin, NE Spain) and their relationship with anthropic activities and the quaternary substrateJ.L. Peña-Monné0L.A. Longares-Aladrén1V. Rubio-Fernández2M.M. Sampietro-Vattuone3M. Sánchez-Fabre4Universidad de ZaragozaUniversidad de ZaragozaUniversidad Autónoma de MadridCONICETUniversidad de ZaragozaThe lower Gállego River has been strongly degraded since the 1960s due to human activity (gravel mining, dump accumulation, channeling works), which has produced a deep channel incision. Although these human-driven processes are usually reported in fluvial bibliography, in this case, more complex results are observable. For instance, regarding the depth and incision rates, we observed no relationship between the most anthropically impacted areas and the sections with the deepest incisions; moreover, the deepening process continues 40 years after the human interventions ceased. The reason for this maladjustment is the role played by the exhumation of the underlying Pleistocene substrate, affected by the synsedimentary processes of karstification. The appearance of paleodolines filled with fine sediments on the incision bottom and sides is the main factor conditioning the continuity and magnitude of the process. Besides, these paleodepressions direct the river dynamics and course, thus favoring its widening when they appear and causing the development of a new riverbed (Qt13) while the 1960s floodplain (Qt12) is becoming an old terrace located between 5 and 11 m above the new alluvial bottom. There are no previous records about this kind of consequences in the regional fluvial dynamics.https://publicaciones.unirioja.es/ojs/index.php/cig/article/view/4409fluvial terracesfluvial dynamicsgravel miningincisionpaleodolines |
| spellingShingle | J.L. Peña-Monné L.A. Longares-Aladrén V. Rubio-Fernández M.M. Sampietro-Vattuone M. Sánchez-Fabre Dynamic changes in the lower Gállego River (Ebro Basin, NE Spain) and their relationship with anthropic activities and the quaternary substrate Cuadernos de Investigación Geográfica fluvial terraces fluvial dynamics gravel mining incision paleodolines |
| title | Dynamic changes in the lower Gállego River (Ebro Basin, NE Spain) and their relationship with anthropic activities and the quaternary substrate |
| title_full | Dynamic changes in the lower Gállego River (Ebro Basin, NE Spain) and their relationship with anthropic activities and the quaternary substrate |
| title_fullStr | Dynamic changes in the lower Gállego River (Ebro Basin, NE Spain) and their relationship with anthropic activities and the quaternary substrate |
| title_full_unstemmed | Dynamic changes in the lower Gállego River (Ebro Basin, NE Spain) and their relationship with anthropic activities and the quaternary substrate |
| title_short | Dynamic changes in the lower Gállego River (Ebro Basin, NE Spain) and their relationship with anthropic activities and the quaternary substrate |
| title_sort | dynamic changes in the lower gallego river ebro basin ne spain and their relationship with anthropic activities and the quaternary substrate |
| topic | fluvial terraces fluvial dynamics gravel mining incision paleodolines |
| url | https://publicaciones.unirioja.es/ojs/index.php/cig/article/view/4409 |
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