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Open AccessArticle

Mapping Paleohydrology of the Ephemeral Kuiseb River, Namibia, from Radar Remote Sensing

1
UMR CNR-5804, Université de Bordeaux, 33615 Pessac, France
2
Gobabeb Research and Training Centre, P.O. Box 953, Walvis Bay 13103, Namibia
3
European Space Agency, ESRIN, 00044 Frascati, Italy
*
Author to whom correspondence should be addressed.
Water 2020, 12(5), 1441; https://doi.org/10.3390/w12051441
Received: 30 March 2020 / Revised: 11 May 2020 / Accepted: 12 May 2020 / Published: 19 May 2020
(This article belongs to the Special Issue Advances in Paleohydrology Using Remote Sensing)
The Kuiseb River is one of the major ephemeral rivers of Western Namibia, setting the northern limit of the Namib Sand Sea and outflowing in the Atlantic Ocean at Walvis Bay. Such ephemeral rivers are of the highest importance for the country since they are related both to recent past climatic conditions and to potential water resources. Using high-resolution radar images from the Japanese ALOS-2 satellite, we mapped for the first time the numerous channels hidden under the surface aeolian sediments: while the non-permanent tributaries of the Kuiseb River appear north of its present-day bed, a wide paleochannel system running westward, assumed by previous studies, could be clearly observed in the interdune valleys in the south. Radar-detected channels were studied during fieldwork in May 2019, which produced both subsurface ground-penetrating radar profiles and high-resolution drone-generated digital elevation models. It allowed us to confirm the existence of the “Paleo–Kuiseb” drainage system, a remnant of the Holocene history of the Kuiseb River, moving northward under the progression of the Namib Sand Sea. Our observations also contribute to the explanation of the young age of the linear dunes at the northern edge of the Namib Sand Sea, which are currently active and are pushing the Kuiseb River course toward the north.
Keywords: Kuiseb River; Namib Desert; radar; paleochannels; subsurface Kuiseb River; Namib Desert; radar; paleochannels; subsurface
MDPI and ACS Style

Paillou, P.; Lopez, S.; Marais, E.; Scipal, K. Mapping Paleohydrology of the Ephemeral Kuiseb River, Namibia, from Radar Remote Sensing. Water 2020, 12, 1441.

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