Hydro-geomorphic dynamics in the Makgadikgadi Okavango Zambezi Basin, Northern Botswana

dc.contributor.advisorCrews, Kelley A.
dc.contributor.advisorGeography and the Environment
dc.contributor.committeeMemberBeach, Timothy
dc.contributor.committeeMemberD'Odorico, Paolo
dc.contributor.committeeMemberKocurek, Gary A
dc.contributor.committeeMemberMeyer, Thoralf
dc.contributor.committeeMemberYoung, Kenneth R
dc.creatorBean, Robert Allen
dc.creator.orcid0000-0001-5940-9757
dc.date.accessioned2019-02-04T17:39:29Z
dc.date.available2019-02-04T17:39:29Z
dc.date.created2018-12
dc.date.issued2018-12-05
dc.date.submittedDecember 2018
dc.date.updated2019-02-04T17:39:29Z
dc.description.abstractThe Makgadikgadi-Okavango-Zambezi (MOZ) basin of Northern Botswana is examined through a series of connected studies at different spatio-temporal scales. With an aim of using different techniques to look at changes and drivers of change in hydrology where the MOZ terminates (Mababe, Ngami, Makgadikgadi), this work looks at dynamics from three perspectives in three chapters: 1) a historical approach (chapter) that examines changes in hydrology and causal factors over the last 200 years; 2) an examination of the soils and their origins (parent materials) in the terminal basins; 3) a case study using Lake Ngami to monitor seasonal changes to surface water over the last 20 years. For the historical chapter, reports and surveys including photographs were used and digitized to complete a catalog of changes to hydrology. Soil pits were excavated at 31 locations and to further investigate provenance elemental analyses, radiocarbon dating, and carbon isotope analyses were conducted. For analysis of change in the areal extent of Lake Ngami Google Earth Engine was used to review and calculate indices from complete Landsat and Sentinel archives. Results from the historical approach provide new photographic evidence combined with longitudinal stream profiles that shed light on the floods of 1925, previously thought to be the largest in this area. Soils that were radiocarbon dated confirm with other studies that 3000 ybp Lake Ngami was much larger and some massive shift in the system caused the regular seasonal inflows to the lake to cease. Similar lacustrine deposits were not found in excavations from either the Makgadikgadi or Mababe basins at topographic lows where deposits would have been expected if these were all filled simultaneously through a connected system. Water indices created for Lake Ngami over the last 20 years were comprised of over 100 scenes from 3 sensor platforms. Key findings include a direct correlation between water indices derived from atmospherically-corrected Landsat-8 and those derived from Sentinel-2 that were not atmospherically corrected. This finding allows for more complete time-series to be constructed in the future without the need for further processing as previously indicated in the literature.
dc.format.mimetypeapplication/pdf
dc.identifierdoi:10.15781/T23776G2S
dc.identifier.urihttp://hdl.handle.net/2152/72730
dc.language.isoen
dc.subjectGeomorphology
dc.subjectHydrology
dc.subjectOkavango Delta
dc.subjectSouthern Africa
dc.titleHydro-geomorphic dynamics in the Makgadikgadi Okavango Zambezi Basin, Northern Botswana
dc.typeThesis
dc.type.materialtext
thesis.degree.departmentGeography and the Environment
thesis.degree.disciplineGeography
thesis.degree.grantorThe University of Texas at Austin
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

Access full-text files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
BEAN-DISSERTATION-2018.pdf
Size:
8.14 MB
Format:
Adobe Portable Document Format

License bundle

Now showing 1 - 1 of 1
No Thumbnail Available
Name:
LICENSE.txt
Size:
1.84 KB
Format:
Plain Text
Description: