Constraining helicopter electromagnetic models of the okavango delta with seismic-refraction and seismic-reflection data

Geophysics

Volumn 79, Issue 3, 2014, Pages B123-B134

  Reiser, Fabienne ^a   Podgorski, Joel E ^a   Schmelzbach, Cedric ^a   Horstmeyer, Heinrich ^a   Green, Alan G ^a   Kalscheuer, Thomas ^b   Maurer, Hansruedi ^a   Kinzelbach, Wolfgang K H ^a   Tshoso, Gomotsang ^c   Ntibinyane, Onkgopotse ^c  

^a ETH ZURICH   (Switzerland)

^b UPPSALA UNIVERSITY   (Sweden)

^c Institute of Environmental Engineering ^*  (Botswana)

Author keywords

[No Author keywords available]

Indexed keywords

AQUIFERS; BUILDINGS; REFRACTION; SALINE WATER; SEISMIC WAVES;

CRYSTALLINE BASEMENT; ELECTRICALLY CONDUCTIVE; ELECTROMAGNETIC MODELS; HIGH-RESOLUTION SEISMIC REFRACTION; SEISMIC REFLECTION DATA; TRANSIENT ELECTROMAGNETICS; UNCONSOLIDATED SEDIMENT; WATER-SATURATED SAND;

SEISMOLOGY;

ELECTRICAL RESISTIVITY; ELECTROMAGNETIC METHOD; P-WAVE; SEISMIC REFLECTION; SEISMIC REFRACTION; SEISMIC VELOCITY; WAVE VELOCITY;

BOTSWANA; NGAMILAND; OKAVANGO DELTA;

EID: 84921824051     PISSN: 00168033     EISSN: 19422156     Source Type: Journal    
DOI: 10.1190/GEO2013-0278.1     Document Type: Article

References (71)

1. Ahmad, J., D. Schmitt, C. Rokosh, and J. Pawlowicz, 2009, High-resolution seismic and resistivity profiling of a buried Quaternary subglacial valley: Northern Alberta, Canada: Geological Society of America Bulletin, 121, 1570-1583, doi: 10.1130/B26305.1.
2. Archie, G. E., 1942, The electrical resistivity log as an aid in determining some reservoir characteristics: Transactions of the American Institute of Mining and Metallurgical Engineers, 146, 54-62.
3. Bachrach, R., J. Dvorkin, and A. Nur, 1998, High-resolution shallowseismic experiments in sand, Part II: Velocities in shallow unconsolidated sand: Geophysics, 63, 1234-1240, doi: 10.1190/1.1444424.
4. Bauer, P., R. Supper, S. Zimmermann, and W. Kinzelbach, 2006, Geoelectrical imaging of groundwater salinization in the Okavango Delta, Botswana: Journal of Applied Geophysics, 60, 126-141, doi: 10.1016/j.jappgeo.2006.01.003.
5. Bauer-Gottwein, P., B. Gondwe, L. Christiansen, D. Herckenrath, L. Kgotlhang, and S. Zimmermann, 2010, Hydrogeophysical exploration of three-dimensional salinity anomalies with the time-domain electromagnetic method (TDEM): Journal of Hydrology, 380, 318-329, doi: 10.1016/j.jhydrol.2009.11.007.
6. Bräuer, B., T. Ryberg, and A. Lindeque, 2007, Shallow seismic velocity structure of the Karoo Basin, South Africa: South African Journal of Geology, 110, 439-448, doi: 10.2113/gssajg.110.2/3.439.
7. Brunner, P., H.-J. Hendricks Franssen, L. Kgotlhang, P. Bauer-Gottwein, and W. Kinzelbach, 2007, How can remote sensing contribute in groundwater modeling?: Hydrogeology Journal, 15, 5-18, doi: 10.1007/s10040-006- 0127-z.
8. Büker, F., A. G. Green, and H. Horstmeyer, 1998a, Shallow 3-D seismic reflection surveying: Data acquisition and preliminary processing: Geophysics, 63, 1434-1450, doi: 10.1190/1.1444444.
9. Büker, F., A. G. Green, and H. Horstmeyer, 1998b, Shallow seismic reflection study of a glaciated valley: Geophysics, 63, 1395-1407, doi: 10.1190/1.1444441.
10. Büker, F., A. G. Green, and H. Horstmeyer, 2000, 3-D high-resolution reflection seismic imaging of unconsolidated glacial and glaciolacustrine sediments: Processing and interpretation: Geophysics, 65, 18-34, doi: 10.1190/1.1444709.
11. Burke, K., and Y. Gunnell, 2008, The African erosion surface: A continental scale synthesis of geomorphology, tectonics, and environmental change over the past 180 million years: GSA Memoirs, 201, 1-66, doi: 10.1130/2008.1201.
12. Campbell, F., A. Kaiser, H. Horstmeyer, and A. Green, 2010, Processing and preliminary interpretation of noisy high-resolution seismic reflection/ refraction data across the active Ostler fault zone, South Island, New Zealand: Journal of Applied Geophysics, 70, 332-342, doi: 10.1016/j.jappgeo.2009.05.001.
13. Cardimona, S., W. Clement, and K. Kadinsky-Cade, 1998, Seismic reflection and ground-penetrating radar imaging of a shallow aquifer: Geophysics, 63, 1310-1317, doi: 10.1190/1.1444432.
14. Cooke, H. J., 1980, Landform evolution in the context of climatic change and neotectonism in the middle Kalahari of north central Botswana: Transactions of the Institute of British Geographers, 5, 80-99.
15. De Iaco, R., A. Green, H. Maurer, and H. Horstmeyer, 2003, Seismic reflection and refraction study of a landfill: Journal of Applied Geophysics, 52, 139-156, doi: 10.1016/S0926-9851(02)00255-0.
16. Dorn, C., S. Carpentier, A. Kaiser, A. G. Green, H. Horstmeyer, F. Campbell, J. Campbell, R. Jongens, M. Finnemore, and D. Nobes, 2010, Highresolution seismic images of potentially seismogenic structures beneath the northwest Canterbury Plains, New Zealand: Journal of Applied Geophysics, 70, 317-331, doi: 10.1016/j.jappgeo.2009.06.003.
17. Du Toit, A. L., 1927, The Kalahari and some of its problems: South African Journal of Science, 24, 88-101.
18. Fradelizio, G., A. Levander, and C. Zelt, 2008, Three-dimensional seismicreflection imaging of a shallow buried paleochannel: Geophysics, 73, no. 5, B85-B98, doi: 10.1190/1.2969775.
19. Francese, R., M. Giudici, D. Schmitt, and A. Zaja, 2005, Mapping the geometry of an aquifer system with a high-resolution reflection seismic profile: Geophysical Prospecting, 53, 817-828, doi: 10.1111/j.1365-2478.2005.00506.x.
20. Gieske, A., 1996, Vegetation driven groundwater recharge below the Okavango Delta (Botswana) as a solute sink mechanism: An indicative model: Botswana Journal of Earth Sciences, 3, 33-37.
21. Giustiniani, M., F. Accaino, S. Picotti, and U. Tinivella, 2008, Characterization of the shallow aquifers by high-resolution seismic data: Geophysical Prospecting, 56, 655-666, doi: 10.1111/j.1365-2478.2008.00705.x.
22. Greenwood, P. G., and R. M. Carruthers, 1973, Geophysical surveys in the Okavango Delta: Report 15, Institute of Geological Sciences Geophysical Division, London.
23. Grey, D. R. C., and H. J. Cooke, 1977, Some problems in the quaternary evolution of the landforms of northern Botswana: Catena, 4, 123-133, doi: 10.1016/0341-8162(77)90014-5.
24. Heincke, B., H. Maurer, A. G. Green, H. Willenberg, T. Spillmann, and L. Burlini, 2006, Characterizing an unstable mountain slope using shallow 2D and 3D seismic tomography: Geophysics, 71, no. 6, B241-B256, doi: 10.1190/1.2338823.
25. Improta, L., and P. P. Bruno, 2007, Combining seismic reflection with multifold wide-aperture profiling: An effective strategy for high-resolution shallow imaging of active faults: Geophysical Research Letters, 34, L20310, doi: 10.1029/2007GL031893.
26. Juhlin, C., H. Palm, C. F. Müllern, and B. Wallberg, 2000, High-resolution reflection seismics applied to detection of groundwater resources in glacial deposits, Sweden: Geophysical Research Letters, 27, 1575-1578, doi: 10.1029/1999GL011295.
27. Kaiser, A. E., A. G. Green, F. M. Campbell, H. Horstmeyer, and E. Manukyan, 2009, Ultrahigh-resolution seismic reflection imaging of the Alpine fault, New Zealand: Journal of Geophysical Research, 114, B11306, doi: 10.1029/2009JB006338.
28. Key, R. M., and N. Ayers, 2000, The 1998 edition of the National Geological Map of Botswana: Journal of African Earth Sciences, 30, 427-451, doi: 10.1016/S0899-5362(00)00030-0. Kinabo, B. D., E. A. Atekwana, J. P. Hogan, M. P. Modisi, D. D. Wheaton, and A. B. Kampunzu, 2007, Early structural development of the Okavango rift zone, NW Botswana: Journal of African Earth Sciences, 48, 125-136. , doi: 10.1016/j.jafrearsci.2007.02.005.
29. Kinabo, B. D., E. A. Atekwana, J. P. Hogan, M. P. Modisi, D. D. Wheaton, and A. B. Kampunzu, 2007, Early structural development of the Okavangorift zone, NW Botswana: Journal of African Earth Sciences, 48, 125-136. , doi: 10.1016/j.jafrearsci.2007.02.005.
30. Kinabo, B. D., J. P. Hogan, E. A. Atekwana, M. G. Abdelsalam, and M. P. Modisi, 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, doi: 10.1029/ 2007TC002154.
31. Knight, R. J., and A. L. Endres, 2005, An introduction to rock physics principles for near-surface geophysics, in D. K. Butler, ed., Near-Surface Geophysics, vol. 3: SEG, 31-70.
32. Laletsang, K., M. P. Modisi, E. M. Shemang, L. Moffat, and O. R. Moagi, 2007, Shallow seismic refraction and magnetic studies at Lake Ngami, the Okavango Delta, northwest Botswana: Journal of African Earth Sciences, 48, 95-99, doi: 10.1016/j.jafrearsci.2006.05.009.
33. Lanz, E., H. Maurer, and A. G. Green, 1998, Refraction tomography over a buried waste disposal site: Geophysics, 63, 1414-1433, doi: 10.1190/1.1444443.
34. Lawton, D. C., 1989, Computation of refraction static corrections using firstbreak traveltime differences: Geophysics, 54, 1289-1296, doi: 10.1190/1.1442588.
35. McCarthy, T. S., 2006, Groundwater in the wetlands of the Okavango Delta, Botswana, and its contribution to the structure and function of the ecosystem: Journal of Hydrology, 320, 264-282, doi: 10.1016/j.jhydrol.2005.07.045.
36. McCarthy, T. S., andW. N. Ellery, 1994, The effect of vegetation on soil and ground water chemistry and hydrology of islands in the seasonal swamps of the Okavango Fan, Botswana: Journal of Hydrology, 154, 169-193, doi: 10.1016/0022-1694(94)90216-X.
37. Metwaly, M., A. G. Green, H. Horstmeyer, and H. R. Maurer, 2005, Combined seismic tomographic and ultra-shallow seismic reflection study of an early dynastic mastaba, Saqqara, Egypt: Archeological Prospection, 12, 245-256, doi: 10.1002/arp.261.
38. Miller, R., 1992, Normal moveout stretch mute on shallow-reflection data: Geophysics, 57, 1502-1507, doi: 10.1190/1.1443217.
39. Milzow, C., L. Kgotlhang, P. Bauer-Gottwein, P. Meier, and W. Kinzelbach, 2009, Regional review: The hydrology of the Okavango Delta, Botswanaprocesses, data and modeling: Hydrogeology Journal, 17, 1297-1328, doi: 10.1007/s10040-009-0436-0.
40. MMEWR (Ministry of Minerals, Energy andWater Resources), 2004, DWA Maun Groundwater Development Project: Phase 2, Resources Assessment and Wellfield Development. Final Report: Botswana Department of Water Affairs, Gaborone.
41. Modisi, M. P., 2000, Fault system at the southeastern boundary of the Okavango Rift, Botswana: Journal of African Earth Sciences, 30, 569-578, doi: 10.1016/S0899-5362(00)00039-7.
42. Modisi, M. P., E. A. Atekwana, A. B. Kampunzu, and T. H. Ngwisanyi, 2000, Rift kinematics during the incipient stages of continental extension: Evidence from the nascent Okavango rift basin, northwest Botswana: Geology, 28, 939-942, doi: 10.1130/0091-7613(2000)28<939: RKDTIS>2.0.CO;2.
43. Nitsche, F. O., A. G. Green, H. Horstmeyer, and F. Büker, 2002, Late Quaternary depositional history of the Reuss delta, Switzerland: Constraints from high-resolution seismic reflection and georadar surveys: Journal of Quaternary Science, 17, 131-143, doi: 10.1002/jqs.645.
44. Ogunsuyi, F. O., and D. R. Schmitt, 2010, Integrating seismic-velocity tomograms and seismic imaging: Application to the study of a buried valley, in R. D. Miller, J. D. Bradford, and K. Holliger, eds., Near surface seismology and ground penetrating radar: SEG, 361-378.
45. Phillips,W. S., and M. C. Fehler, 1991, Traveltime tomography: A comparison of popular methods: Geophysics, 56, 1639-1649, doi: 10.1190/1.1442974.
46. Podgorski, J. E., E. Auken, C. Schamper, A. V. Christiansen, T. Kalscheuer, and A. G. Green, 2013a, Processing and inverting commercial helicopter time-domain electromagnetic data for environmental assessments and geological and hydrological mapping: Geophysics, 78, no. 4, E149- E159, doi: 10.1190/geo2012-0452.1.
47. Podgorski, J. E., A. G. Green, L. Kgotlhang, W. K. H. Kinzelbach, T. Kalscheuer, E. Auken, and T. Ngwisanyi, 2013b, Paleo mega lake and paleo megafan in southern Africa: Geology, 41, 10.1130/ G34735.1.
48. Reeves, C. V., 1972, Rifting in the Kalahari?: Nature, 237, 95-96, doi: 10.1038/237095a0.
49. Reeves, C. V., and D. G. Hutchins, 1975, Crustal structures in central southern Africa: Nature, 254, 408-410, doi: 10.1038/254408a0.
50. Reeves, C. V., and D. G. Hutchins, 1976, The national gravity survey of Botswana 1972-3: Botswana Geological Survey Bulletin 5.
51. Robertsson, J., K. Holliger, A. Green, A. Pugin, and R. De Iaco, 1996, Effects of near-surface waveguides on shallow high-resolution seismic refraction and reflection data: Geophysical Research Letters, 23, 495-498, doi: 10.1029/96GL00384.
52. Robertsson, J. O. A., K. Holliger, and A. G. Green, 2012, Source-generated noise in shallow seismic data, in J. O. A. Robertsson, J. O. Blanch, K. Nihei, and J. Tromp, eds., Numerical modeling of seismic wave propagation: Gridded two-way wave-equation methods: SEG, vol. 28, of Geophysics Reprint Series, 101.
53. Ronen, J., and J. Claerbout, 1985, Surface-consistent residual statics estimation by stack-power maximization: Geophysics, 50, 2759-2767, doi: 10.1190/1.1441896.
54. Scales, J., P. Docherty, and A. Gersztenkorn, 1990, Regularisation of nonlinear inverse problems: Imaging the near-surface weathering layer: Inverse Problems, 6, 115-131, doi: 10.1088/0266-5611/6/1/011.
55. Schmelzbach, C., A. Green, and H. Horstmeyer, 2005, Ultra-shallow seismic reflection imaging in a region characterised by high source-generated noise: Near Surface Geophysics, 3, 33-46, doi: 10.3997/1873-0604.2004027.
56. Schmelzbach, C., C. A. Zelt, C. Juhlin, and R. Carbonell, 2008, P-and SV-velocity structure of the South Portuguese Zone fold-and-thrust belt, SW Iberia, from traveltime tomography: Geophysical Journal International, 175, 689-712, doi: 10.1111/j.1365-246X.2008.03937.x.
57. Scholz, C. H., T. A. Koczynski, and D. G. Hutchins, 1976, Evidence for incipient rifting in Southern Africa: Geophysical Journal of the Royal Astronomical Society, 44, 135-144, doi: 10.1111/j.1365-246X.1976.tb00278.x.
58. Schön, J. H., 1997, Physical properties of rocks: Fundamentals and principles of petrophysics: Elsevier Science, vol. 18, of Handbook of Geophysical Exploration.
59. Shemang, E. M., and L. N. Molwalefhe, 2009, DC resistivity and seismic refraction survey across the SE margin of Lake Ngami, NW Botswana: Acta Geophysica, 57, 728-742.
60. Stanistreet, I. G., and T. S. McCarthy, 1993, The Okavango Fan and the classification of subaerial fan systems: Sedimentary Geology, 85, 115- 133, doi: 10.1016/0037-0738(93)90078-J.
61. Steeples, D., A. Green, T. McEvilly, R. Miller, W. Doll, and J. Rector, 1997, A workshop examination of shallow seismic reflection surveying: The Leading Edge, 16, 1641-1647, doi: 10.1190/1.1437543.
62. Stümpel, H., S. Kähler, R. Meissner, and B. Milkereit, 1984, The use of seismic shear waves and compressional waves for lithological problems of shallow sediments: Geophysical Prospecting, 32, 662-675, doi: 10.1111/j.1365-2478.1984.tb01712.x.
63. Sumanovac, F., 2006, Mapping thin sandy aquifers by using high resolution seismics and 2-D electrical tomography: Journal of Applied Geophysics, 58, 144-157, doi: 10.1016/j.jappgeo.2005.06.005.
64. Viezzoli, A., A. V. Christiansen, E. Auken, and K. Sørensen, 2008, Quasi- 3D modeling of airborne TEM data by spatially constrained inversion: Geophysics, 73, no. 3, F105-F113, doi: 10.1190/1.2895521.
65. Whiteley, R. J., J. A. Hunterand, S. E. Pullan, and P. Nutalaya, 1998, Optimum offset seismic reflection mapping of shallow aquifers near Bangkok, Thailand: Geophysics, 63, 1385-1394, doi: 10.1190/1.1444440.
66. Woldearegay, A., P. Jaiswal, A. Simms, H. Alexander, L. Bement, and B. Carter, 2012, Ultrashallow depth imaging of a channel stratigraphy with first-arrival traveltime inversion and prestack depth migration: A case history from Bull Creek, Oklahoma: Geophysics, 77, no. 2, B87-B96, doi: 10.1190/geo2011-0218.1.
67. Yilmaz, O., 2001, Seismic data analysis: SEG.
68. Yordkayhun, S., C. Juhlin, and B. Norden, 2009a, 3D seismic reflection surveying at the CO2SINK project site, Ketzin, Germany: A study for extracting shallow subsurface information: Near Surface Geophysics, 7, 75-91, doi: 10.3997/1873-0604.2008036.
69. Yordkayhun, S., A. Tryggvason, B. Norden, C. Juhlin, and B. Bergman, 2009b, 3D seismic traveltime tomography imaging of the shallow subsurface at the CO2SINK project site, Ketzin, Germany: Geophysics, 74, no. 1, G1-G15, doi: 10.1190/1.3026553.
70. Zelt, C., A. Azaria, and A. Levander, 2006, 3D seismic refraction traveltime tomography at a groundwater contamination site: Geophysics, 71, no. 5, H67-H78, doi: 10.1190/1.2258094.
71. Zimmermann, S., P. Bauer, R. Held, W. Kinzelbach, and J. Walther, 2006, Salt transport on islands in the Okavango Delta: Numerical investigations: Advances in Water Resources, 29, 11-29, doi: 10.1016/j.advwatres.2005.04.013.