Capturing complex star dune dynamics—repeated highly accurate surveys combining multitemporal 3D topographic measurements and local wind data
نویسندگان
چکیده
Morphologies of highly complex star dunes are the result aeolian dynamics in past and present times. These reflect climatic conditions associated forces like sediment availability vegetation cover, as well feedbacks with adjacent environments. However, an understanding on dune morphometries is still lacking sufficient detail, their influence formation evolution remains unclear. We therefore investigate a (Erg Chebbi, Morocco) by analysing wind measurements compared to morphometric changes derived from multitemporal high-accuracy 3D observations during two surveys (October 2018 February 2020). Using real-time kinematic global navigation satellite system (RTK-GNSS) terrestrial laser scanning (TLS), reaction surface observed constant unimodal sand-moving presented. TLS point clouds used for analysis direct change analysis, which relates sand transport. RTK-GNSS enable assessment horizontal crest movement. Observed lead identification overall shielding effect, resulting accumulation mainly windward slopes. Our results self-sustained growth, has not yet been described such spatial detail. Steep slopes, often found around globe, seem partly hinder upslope Though comparatively short observation period, we hypothesize that, besides intensity alone, slope angles more decisive transport than previously assumed. methodological approach combining meteorological data high-resolution elevation models can be monitoring all forms contributes general evolution.
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ژورنال
عنوان ژورنال: Earth Surface Processes and Landforms
سال: 2022
ISSN: ['1096-9837', '0197-9337']
DOI: https://doi.org/10.1002/esp.5420