Dynamics of Mediterranean late Quaternary fluvial activity: An example from the River Ebro (north Iberian Peninsula)
| Autor: | Andreas Lang, Ángel Soria-Jáuregui, María José González-Amuchastegui, Barbara Mauz |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Floodplain Fluvial Sediment 010502 geochemistry & geophysics 01 natural sciences River terraces Overbank Alluvium Quaternary Geomorphology Geology Holocene 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Geomorphology. 268:110-122 |
| ISSN: | 0169-555X |
| DOI: | 10.1016/j.geomorph.2016.06.006 |
| Popis: | Late Pleistocene and Holocene fluvial evolution of the upper River Ebro (Miranda basin, north Spain) is analysed using geomorphological, sedimentological, and optical dating techniques. Maximum regional crustal uplift of 0.98 m/ka approximately helped preserve a suite of terraces in the Miranda basin: 5 river terraces (T1–5) were identified and their formation attributed to MIS 6 (T 1 ), MIS 5d (T 2 ), MIS 4 (T 3 ), MIS 2 (T 4 ), MIS 1 (T 5 ). Alluvium deposited in terraces T 1 , T 2 , T 3 , and T 4 is well-sorted, clast-supported gravels; whereas the T 5 deposit is exclusively composed of silt. Gravels were deposited during cold and dry periods when reduced vegetation cover on hillslopes increased sediment supply to the trunk river. Silt was deposited in overbank settings under warmer and wetter climate conditions when vegetation cover stabilised hillslopes and restricted sediment supply. It also resulted in lower peak discharge and reduced flow velocities over vegetated floodplains. The chronological sequence of terraces indicates that incision occurred during climatic transitions. We conclude that the upper River Ebro responded to fluctuations in sediment supply and discharge controlled by late Quaternary climate cycles. |
| Databáze: | OpenAIRE |
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