Dryland avulsion sequences: Insights from data-model comparison of a terminal dryland river system
نویسندگان
چکیده
An advection–diffusion model of fluvial processes was used to analyze the stratigraphic expression avulsions in terminal river systems and understand their control on basin-fill architecture. The initial boundary conditions runs (i.e., catchment area, smoothed topographic surface, grain-size distribution sediment supply rates) were extracted from modern Rio Colorado dryland system Altiplano Basin (Bolivia). Water-discharge sediment-load values derived global regression curves BQART equation, respectively. To evaluate robustness simulations, tested under increasing scenarios ranging 0.003 m3/s 0.095 m3/s. Data-model comparison provided insights into role geomorphological evolution systems. observed stacking sediments, as captured by geospatial geochronological data Colorado, is consistent with high scenarios, which start a single-thread channel that time radially expands over floodplain successive account alluvial-ridge aggradation channel-floor elevation above surrounding floodplain. output shows laterally extensive, convex-upwards lobate topography agreement lateral longitudinal geomorphology upper lower coastal plain Colorado. simulated inter-avulsion period, period between two full (or stabilized) model, varies 0.18 1.2 kyr OSL-age determination periods up 1.28 ± 0.34 kyr.
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ژورنال
عنوان ژورنال: Sedimentary Geology
سال: 2022
ISSN: ['0037-0738', '1879-0968']
DOI: https://doi.org/10.1016/j.sedgeo.2022.106169