Integrated interpretation of helicopter and ground-based geophysical data recorded within the Okavango Delta, Botswana

Archie, 1942, The electrical resistivity log as an aid in determining some reservoir characteristics, Trans. Am. Inst. Min. Metall. Eng., 146, 54

Auken, 2004, Layered and laterally constrained 2D inversion of resistivity data, Geophysics, 69, 752, 10.1190/1.1759461

Auken, 2005, Piecewise 1D laterally constrained inversion of resistivity data, Geophys. Prospect., 53, 497, 10.1111/j.1365-2478.2005.00486.x

Auken, 2006, A survey of current trends in near-surface electrical and electromagnetic methods, Geophysics, 71, G249, 10.1190/1.2335575

Baster, 2003, High-resolution seismic stratigraphy of an Holocene lacustrine delta in western Lake Geneva (Switzerland), Eclogae Geol. Helv., 96, S11

Bauer, 2004

Bräuer, 2007, Shallow seismic velocity structure of the Karoo Basin, South Africa, S. Afr. J. Geol., 110, 439, 10.2113/gssajg.110.2-3.439

Brunner, 2007, How can remote sensing contribute in groundwater modeling?, Hydrogeol. J., 15, 5, 10.1007/s10040-006-0127-z

Büker, 1998, Shallow seismic refection study of a glaciated valley, Geophysics, 63, 1395, 10.1190/1.1444441

Burke, 2008, The African erosion surface: a continental scale synthesis of geomorphology, tectonics, and environmental change over the past 180 million years, Geol. Soc. Am. Mem., 201

Burrough, 2009, Mega-Lake in the Kalahari: a Late Pleistocene record of the Palaeolake Makgadikgadi system, Quat. Sci. Rev., 28, 1392, 10.1016/j.quascirev.2009.02.007

Burrough, 2009, Late Quaternary hydrological dynamics in the Middle Kalahari: forcing and feedbacks, Earth Sci. Rev., 96, 313, 10.1016/j.earscirev.2009.07.001

Campbell, 2006, Airborne geophysical mapping of aquifer water quality and structural controls in the Lower Okavango Delta, Botswana, S. Afr. J. Geol., 109, 475, 10.2113/gssajg.109.4.475

Christiansen, 2009, The transient electromagnetic method, 179

Cooke, 1980, Landform evolution in the context of climatic change and neotectonism in the middle Kalahari of north central Botswana, Trans. Inst. Br. Geogr., 5, 80, 10.2307/622100

Cox, 1989, The role of mantle plumes in the development of continental drainage patterns, Nature, 342, 873, 10.1038/342873a0

Du Toit, 1927, The Kalahari and some of its problems, S. Afr. J. Sci., 24, 88

Fairhead, 1971, The seismicity of Africa, Geophys. J. R. Astron. Soc., 24, 271, 10.1111/j.1365-246X.1971.tb02178.x

Garstang, 1998, The contribution of aerosol- and water-borne nutrients to the functioning of the Okavango Delta ecosystem, Botswana, S. Afr. J. Sci., 94, 215

Gieske, 1996, Vegetation driven groundwater recharge below the Okavango Delta (Botswana) as a solute sink mechanism: an indicative model, Botsw. J. Earth Sci., 3, 33

Gomez-Trevino, 1983, Electromagnetic sounding in the sedimentary basin of southern Ontario—a case history, Geophysics, 48, 311, 10.1190/1.1441470

Greenwood, 1973, Geophysical Surveys in the Okavango Delta

Gumbricht, 2005, The micro-topography of the wetlands of the Okavango Delta, Botswana, Earth Surf. Process. Landf., 30, 27, 10.1002/esp.1124

Haddon, 2005, The Mesozoic–Cenozoic interior sag basins of Central Africa: the Late-Cretaceous–Cenozoic Kalahari and Okavango basins, J. Afr. Earth Sci., 43, 316, 10.1016/j.jafrearsci.2005.07.008

Haimberger, 2005, High-resolution seismic survey on the Rhine River in the northern Upper Rhine Graben, Int. J. Earth Sci., 94, 657, 10.1007/s00531-005-0514-z

Harinarayana, 1999, Combination of EM and DC measurements for upper crustal studies, Surv. Geophys., 20, 257, 10.1023/A:1006681604433

Hutchison, 1973, A mathematical model to aid management of outflow from the Okavango swamp, Botswana, J. Hydrol., 19, 92, 10.1016/0022-1694(73)90073-5

Jørgensen, 2012, Transboundary geophysical mapping of geological elements and salinity distribution critical for the assessment of future sea water intrusion in response to sea level rise, Hydrol. Earth Syst. Sci. Discuss., 9, 2629, 10.5194/hessd-9-2629-2012

Kalscheuer, 2015, New insights into the hydrological system beneath the central Okavango Delta (Botswana) from joint inversions of three types of electromagnetic data explicitly constrained by seismic observations, Geophys. J. Int., 10.1093/gji/ggv184

Karp, 2012, Structure and stratigraphy of the Lake Albert Rift, East Africa: observations from seismic reflection and gravity data, AAPG Mem., 95, 299

Key, 2000, The 1998 edition of the National Geological Map of Botswana, J. Afr. Earth Sci., 30, 427, 10.1016/S0899-5362(00)00030-0

Kinabo, 2007, Early structural development of the Okavango rift zone, NW Botswana, J. Afr. Earth Sci., 48, 125, 10.1016/j.jafrearsci.2007.02.005

Kinabo, 2008, Fault growth and propagation during incipient continental rifting: insights from a combined aeromagnetic and Shuttle Radar Topography Mission digital elevation model investigation of the Okavango Rift Zone, northwest Botswana, Tectonics, 27, TC3013, 10.1029/2007TC002154

Kirkegaard, 2011, Salinity distribution in heterogeneous coastal aquifers mapped by airborne electromagnetics, Vadose Zone J., 10, 125, 10.2136/vzj2010.0038

Knight, 2005, An introduction to rock physics principles for near-surface geophysics, vol. 3, 31

Lanz, 1998, Refraction tomography over a buried waste disposal site, Geophysics, 63, 1414, 10.1190/1.1444443

Loke, 1996, Rapid least-squares inversion of apparent resistivity pseudosections by a quasi-Newton method, Geophys. Prospect., 44, 131, 10.1111/j.1365-2478.1996.tb00142.x

Lyons, 2011, Late Quaternary stratigraphic analysis of the Lake Malawi Rift, East Africa: an integration of drill-core and seismic-reflection data, Palaeogeogr. Palaeoclimatol. Palaeoecol., 303, 20, 10.1016/j.palaeo.2009.04.014

Mallick, 1979, Time-domain electromagnetic sounding computation of multi-layer response and the problem of equivalence in interpretation, Geophys. Prospect., 27, 137, 10.1111/j.1365-2478.1979.tb00962.x

Mandl, 1981, Gravitational gliding in deltas, Geol. Soc. Lond. Spec. Publ., 9, 41, 10.1144/GSL.SP.1981.009.01.05

McCarthy, 2006, Groundwater in the wetlands of the Okavango Delta, Botswana, and its contribution to the structure and function of the ecosystem, J. Hydrol., 320, 264, 10.1016/j.jhydrol.2005.07.045

McCarthy, 2013, The Okavango Delta and its place in the geomorphological evolution of southern Africa, S. Afr. J. Geol., 116, 1, 10.2113/gssajg.116.1.1

McCarthy, 1994, The effect of vegetation on soil and ground water chemistry and hydrology of islands in the seasonal swamps of the Okavango Fan, Botswana, J. Hydrol., 154, 169, 10.1016/0022-1694(94)90216-X

McCarthy, 1986, The roles of sedimentation and plant growth in changing flow patterns in the Okavango Delta, Botswana, S. Afr. J. Sci., 82, 579

McCarthy, 1993, The influence of neo-tectonics on water dispersal in the northeastern regions of the Okavango swamps, Botswana, J. Afr. Earth Sci., 17, 23, 10.1016/0899-5362(93)90019-M

McCarthy, 1997, The gradient of the Okavango fan, Botswana, and its sedimentological and tectonic implications, J. Afr. Earth Sci., 24, 65, 10.1016/S0899-5362(97)00027-4

McCarthy, 1998, Observations on the hydrology and geohydrology of the Okavango Delta, S. Afr. J. Geol., 101, 101

McCarthy, 1998, Some observations on the geomorphological impact of hippopotamus (Hippopotamus amphibius L.) in the Okavango Delta, Botswana, Afr. J. Ecol., 36, 44, 10.1046/j.1365-2028.1998.89-89089.x

McGlue, 2006, Facies architecture of flexural margin lowstand delta deposits in Lake Edward, East African Rift: constraints from seismic reflection imaging, J. Sediment. Res., 76, 942, 10.2110/jsr.2006.068

Meier, 2014, Hydrogeophysical investigations in the western and north-central Okavango Delta (Botswana) based on helicopter and ground-based transient electromagnetic data and electrical resistance tomography, Geophysics, 79, B201, 10.1190/geo2014-0001.1

Miall, 1985, Architectural-element analysis: a new method of facies analysis applied to fluvial deposits, Earth Sci. Rev., 22, 261, 10.1016/0012-8252(85)90001-7

Milzow, 2009, Regional review: the hydrology of the Okavango Delta, Botswana—processes, data and modelling, Hydrol. J., 17, 1297

MMEWR (Ministry of Minerals, Energy and Water Resources), 2004

Modisi, 2000, Rift kinematics during the incipient stages of continental extension: evidence from the nascent Okavango rift basin, northwest Botswana, Geology, 28, 939, 10.1130/0091-7613(2000)28<939:RKDTIS>2.0.CO;2

Moore, 2001, Drainage evolution in south-central Africa since the breakup of Gondwana, S. Afr. J. Geol., 104, 47, 10.2113/104.1.47

Moore, 2012, The evolution and ages of Makgadikgadi palaeo-lakes: consilient evidence from Kalahari drainage evolution, S. Afr. J. Geol., 115, 385, 10.2113/gssajg.115.3.385

Nyboe, 2010, Integrated inversion of TEM and seismic data facilitated by high penetration depths of a segmented receiver setup, Near Surf. Geophys., 8, 467, 10.3997/1873-0604.2010026

Oldenburg, 1999, Estimating depth of investigation in dc resistivity and IP surveys, Geophysics, 64, 403, 10.1190/1.1444545

Podgorski, 2013, Processing and inverting commercial helicopter time-domain electromagnetic data for environmental assessments and geological and hydrological mapping, Geophysics, 78, E149, 10.1190/geo2012-0452.1

Podgorski, 2013, Paleo megalake and paleo megadelta in southern Africa, Geology, G34735-1

Post, 2013, Offshore fresh groundwater reserves as a global phenomenon, Nature, 2013, 71, 10.1038/nature12858

Prior, 1984, Submarine slope instability, 419

Raiche, 1985, The joint use of coincident loop transient electromagnetic and Schlumberger sounding to resolve layered structures, Geophysics, 50, 1618, 10.1190/1.1441851

Reeves, 1972, Rifting in the Kalahari, Nature, 237, 95, 10.1038/237095a0

Reiser, 2014, Constraining helicopter electromagnetic models of the Okavango Delta with seismic-refraction and seismic-reflection data, Geophysics, 79, B123, 10.1190/geo2013-0278.1

Schmelzbach, 2008, P- and SV-velocity structure of the South Portuguese Zone fold-and-thrust belt, SW Iberia, from traveltime tomography, Geophys. J. Int., 175, 689, 10.1111/j.1365-246X.2008.03937.x

Scholz, 1995, Deltas of the Lake Malawi Rift, East Africa: seismic expression and exploration implications, AAPG Bull., 79, 1679

Scholz, 1976, Evidence for incipient rifting in Southern Africa, Geophys. J. R. Astron. Soc., 44, 135, 10.1111/j.1365-246X.1976.tb00278.x

Scholz, 2003, Paleolimnology of Lake Tanganyika, East Africa, over the past 100kyr, J. Paleolimnol., 30, 139, 10.1023/A:1025522116249

Siemon, 2011, Application of frequency-domain helicopter-borne electromagnetic for groundwater exploration in urban areas, Phys. Chem. Earth, 36, 1373, 10.1016/j.pce.2011.02.006

Spies, 1991, Electromagnetic sounding, vol. 2, 285

Stanistreet, 1993, The Okavango Fan and the classification of subaerial fan systems, Sediment. Geol., 85, 115, 10.1016/0037-0738(93)90078-J

Steuer, 2009, A comparison of helicopter borne electromagnetic in frequency- and time-domain at the Cuxhaven valley in Northern Germany, J. Appl. Geophys., 67, 194, 10.1016/j.jappgeo.2007.07.001

Stümpel, 1984, The use of seismic shear waves and compressional waves for lithological problems of shallow sediments, Geophys. Prospect., 32, 662, 10.1111/j.1365-2478.1984.tb01712.x

Thomas, 1988, Late Cainozoic drainage evolution in the Zambezi Basin: geomorphological evidence from the Kalahari rim, J. Afr. Earth Sci., 7, 611, 10.1016/0899-5362(88)90111-X

Thomas, 1991

Viezzoli, 2008, Quasi-3D modeling of airborne TEM data by spatially constrained inversion, Geophysics, 73, F105, 10.1190/1.2895521

Wood, 1994, Seismic expression and geological significance of a lacustrine delta in Neogene deposits of the Western Snake River Plain, Idaho, AAPG Bull., 78, 102