| Vol. 16 (1999) | |||
- Bestimmung der Grundwasserneubildung
im semiariden Bereich Namibias mittels der Chlorid-Bilanz-Methode.
[Estimation of Groundwater Recharge in Semiarid Namibia Using the Chloride-Mass-Balance-Approach]
Wrabel, Jens (1999), 155 p., 94 Fig., 54 Tab.
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Abstract
Bestimmung der Grundwasserneubildung im semiariden Bereich
Namibias mittels der Chlorid-Bilanz-Methode.
[Estimation of Groundwater Recharge in Semiarid Namibia Using the Chloride-Mass-Balance-Approach]
Jens Wrabel
Abstract: In arid and semi-arid areas the estimation of groundwater
recharge as a prerequisite for sustainable water resources management
still poses major problems. Apart from vegetation and climatological factors
the amount of infiltrating water and the rate of groundwater recharge
strongly depends on the characteristics of the unsaturated zone. The thickness
and the parameters describing the soil physics determine the infiltration
capacity, evaporation and eventually groundwater recharge.
For the study area 'Hochfeld' in Namibia the estimation of groundwater
recharge is carried out, using the chloride mass balance approach. In
several soil profiles the chloride content in the soil matrix and pore
waters is determined together with the parameters of soil physics. Using
these parameters and chemical data, water and solute transport through
the unsaturated zone at the study site is modelled.
The regionalisation of groundwater recharge is based on additional hydro-chemical
groundwater data using a Geographical Information System (GIS). By means
of cluster analysis different groundwater types are identified highlighting
the heterogenity of groundwater composition in the study area. The processes
explaining the local variations of groundwater compositions are explored
with GIS techniques. Finally this allows the transfer from local data
to regional maps of groundwater rechargeand the regionalisation of groundwater
recharge.
Paper language: german; german
abstract
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