Adaptation of river channels to a wetter or drier climate: Insights from the Lower Pilcomayo River, South America
نویسندگان
چکیده
Climate change has a direct influence on both hydrology and floodplain vegetation of water courses, which are key players in river morphodynamics. The system response to climate is complex the effects non-linear interactions between alterations water, sediment remain incompletely understood. Which these components becomes dominant shaping channel when drier or wetter? To answer this question, we investigate cross-sectional sand-bed rivers focusing width depth, respond directly changes boundary stresses. Thanks exceptional availability long time-series daily discharge profiles, Pilcomayo River an ideal living lab for investigation. We constructed two-dimensional model using open-source state-of-the-art, structured Delft3D code. highly dynamic behaviour quick morphological adaptation allowed reducing period time covered by simulations because cross-section adapts its morphology new value within hours days, crucial modelling investigations. Calibration validation were successfully performed comparison with historical data. considered several scenarios representing current, dryer wetter climates. results show that reduces depth enlarges width. A increases but produces negligible widening. Vegetation, sparser denser climate, found control This analysis unique shows can be expected alluvial natural vegetated banks due change.
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ژورنال
عنوان ژورنال: Journal of Hydrology
سال: 2022
ISSN: ['2589-9155']
DOI: https://doi.org/10.1016/j.jhydrol.2022.128254