Structure and genesis of the Cubango Megafan in northern Namibia: implications for its hydrogeology

Deep, semi-fossil aquifers in southern Africa: A synthesis of hydrogeological investigations in northern Namibia

“…Clay-mineralogical investigations showed that the presence of swelling clay minerals in the pore spaces is responsible for the strong hydraulic sealing eff ect of the aquitard . The low permeability was confi rmed by hydraulic tests on watersaturated and triaxially pressurised sediment samples Lindenmaier et al, 2014). Although the dry core material appeared to be of high porosity, the hydraulic tests carried out under the aforementioned conditions showed that swelling of the clay minerals caused very low hydraulic conductivities on the order of 10 -9 m s -1 .…”

“…Within SASSCAL, the opportunity to carry out scientifi c research on the deep aquifer system emerged. Together with a local partner, the University of Namibia (UNAM), and with the support of the German Aerospace Center (DLR), key questions related to the deep Ohangwena 2 aquifer (KOH-II; Lindenmaier et al, 2014) were investigated:…”

“…Satellite radar interferometry (InSAR) has been shown previously to be a useful Figure 3: Example of sedimentological and well log as well as geophysical tests from one of the deep drillings in northern Namibia (modifi ed after Lindenmaier et al, 2014) tool for the analysis of ground uplifts and subsidence processes on a regional scale, which can be used to study groundwater recharge or aquifer depletion (i.e., Bell et al, 2008;Ferretti et al, 2014, Hanssen 2001). Here, we apply the concepts of InSAR to evaluate the possibility of infi ltration at the foothills of the Angolan highlands to the outcrops of the KOH-II aquifer .…”

A deuterium-based labeling technique for the investigation of rooting depths, water uptake dynamics and unsaturated zone water transport in semiarid environments

“…The Cuvelai-Etosha region is home to a large number of people both on the Namibian and Angolan side, mainly due to the fact that shallow groundwater and relatively fertile soils are accessible to many areas (Mendelsohn et al, 2013). The basin has vivid hydrogeological history as both the deltas of the Cunene and Okavango Rivers were once situated within the CEB (Lindenmaier et al, 2014;Miller et al, 2010). In recent history, a deep aquifer containing fresh water was discovered in the 9 northeastern part of the basin (Lindenmaier et al, 2014), likely a remainder of the former Okavango Delta.…”

Spatio-temporal variations of hydrochemical and isotopic patterns of groundwater in hand-dug wells: the Cuvelai-Etosha Basin, Namibia

“…1). CEB is the Namibian part of the Cuvelai catchment which is a huge sedimentary basin extending from the southern Angolan highlands into north central Namibia covering an area of about 165 000 km 2 (Lindenmaier et al, 2014). Two core study areas were defined, namely Ohangwena and Omusati regions ( Table 1).…”