Arid
DOI10.1007/s10040-017-1615-z
Inverse modeling and uncertainty analysis of potential groundwater recharge to the confined semi-fossil Ohangwena II Aquifer, Namibia
Wallner, Markus1,2; Houben, Georg1; Lohe, Christoph1,3; Quinger, Martin1,3; Himmelsbach, Thomas1
通讯作者Wallner, Markus
来源期刊HYDROGEOLOGY JOURNAL
ISSN1431-2174
EISSN1435-0157
出版年2017
卷号25期号:8页码:2303-2321
英文摘要

The identification of potential recharge areas and estimation of recharge rates to the confined semi-fossil Ohangwena II Aquifer (KOH-2) is crucial for its future sustainable use. The KOH-2 is located within the endorheic transboundary Cuvelai-Etosha-Basin (CEB), shared by Angola and Namibia. The main objective was the development of a strategy to tackle the problem of data scarcity, which is a well-known problem in semi-arid regions. In a first step, conceptual geological cross sections were created to illustrate the possible geological setting of the system. Furthermore, groundwater travel times were estimated by simple hydraulic calculations. A two-dimensional numerical groundwater model was set up to analyze flow patterns and potential recharge zones. The model was optimized against local observations of hydraulic heads and groundwater age. The sensitivity of the model against different boundary conditions and internal structures was tested. Parameter uncertainty and recharge rates were estimated. Results indicate that groundwater recharge to the KOH-2 mainly occurs from the Angolan Highlands in the northeastern part of the CEB. The sensitivity of the groundwater model to different internal structures is relatively small in comparison to changing boundary conditions in the form of influent or effluent streams. Uncertainty analysis underlined previous results, indicating groundwater recharge originating from the Angolan Highlands. The estimated recharge rates are less than 1% of mean yearly precipitation, which are reasonable for semi-arid regions.


英文关键词Groundwater recharge Inverse modeling Arid regions Angola Namibia
类型Article
语种英语
国家Germany ; Namibia
收录类别SCI-E
WOS记录号WOS:000415195900008
WOS关键词CUVELAI-ETOSHA BASIN ; WATER-BALANCE MODEL ; SOUTHERN AFRICA ; EVOLUTION ; AGE ; KALAHARI ; CLIMATE ; REGIONS ; DESERT ; PAN
WOS类目Geosciences, Multidisciplinary ; Water Resources
WOS研究方向Geology ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/199468
作者单位1.Fed Inst Geosci & Nat Resources BGR, Stilleweg 2, D-30655 Hannover, Germany;
2.BPI Hannover, Mengendamm 16D, D-30177 Hannover, Germany;
3.Minist Agr Water & Forestry, Luther St Private Bag, Windhoek 13184, Namibia
推荐引用方式
GB/T 7714
Wallner, Markus,Houben, Georg,Lohe, Christoph,et al. Inverse modeling and uncertainty analysis of potential groundwater recharge to the confined semi-fossil Ohangwena II Aquifer, Namibia[J],2017,25(8):2303-2321.
APA Wallner, Markus,Houben, Georg,Lohe, Christoph,Quinger, Martin,&Himmelsbach, Thomas.(2017).Inverse modeling and uncertainty analysis of potential groundwater recharge to the confined semi-fossil Ohangwena II Aquifer, Namibia.HYDROGEOLOGY JOURNAL,25(8),2303-2321.
MLA Wallner, Markus,et al."Inverse modeling and uncertainty analysis of potential groundwater recharge to the confined semi-fossil Ohangwena II Aquifer, Namibia".HYDROGEOLOGY JOURNAL 25.8(2017):2303-2321.
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