Catchment response to lava damming: integrating field observation, geochronology and landscape evolution modelling
| Autor: | Tony Reimann, Darrel Maddy, Tuncer Demir, Jeroen M. Schoorl, Jan R. Wijbrans, Tom Veldkamp, Wouter van Gorp, Arnaud Temme |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Hydrology
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Thermoluminescence dating Pleistocene Lava Geography Planning and Development Drainage basin Climate change Fluvial STREAMS 010502 geochemistry & geophysics 01 natural sciences Aggradation Earth and Planetary Sciences (miscellaneous) Geology 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Earth Surface Processes and Landforms. 41:1629-1644 |
| ISSN: | 0197-9337 |
| DOI: | 10.1002/esp.3981 |
| Popis: | Combining field reconstruction and landscape evolution modelling can be useful to investigate the relative role of different drivers on catchment response. The Geren Catchment (~45 km2) in western Turkey is suitable for such a study, as it has been influenced by uplift, climate change and lava damming. Four Middle Pleistocene lava flows (40Ar/39Ar- dated from 310 to 175 ka) filled and dammed the Gediz River at the Gediz–Geren confluence, resulting in base-level fluctuations of the otherwise uplift-driven incising river. Field reconstruction and luminescence dating suggest fluvial terraces in the Geren Catchment are capped by Middle Pleistocene aggradational fills. This showed that incision of the Geren trunk stream has been delayed until the end of MIS 5. Subsequently, the catchment has responded to base-level lowering since MIS 4 by 30 m of stepped net incision. Field reconstruction left us with uncertainty on the main drivers of terrace formation. Therefore, we used landscape evolution modelling to investigate catchment response to three scenarios of base-level change: (i) uplift with climate change (rainfall and vegetation based on arboreal pollen); (ii) uplift, climate change and short-lived damming events; (iii) uplift, climate and long-lived damming events. Outputs were evaluated for erosion–aggradation evolution in trunk streams at two different distances from the catchment outlet. Climate influences erosion–aggradation activity in the catchment, although internal feedbacks influence timing and magnitude. Furthermore, lava damming events partly control if and where these climate-driven aggradations occur. Damming thus leaves a legacy on current landscape evolution. Catchment response to long-duration damming events corresponds best with field reconstruction and dating. The combination of climate and base level explains a significant part of the landscape evolution history of the Geren Catchment. By combining model results with fieldwork, additional conclusions on landscape evolution could be drawn. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text