Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Non-perennial"”.
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Habitat modeling in perennial and non-perennial rivers: developments and applications
L'abstract è presente nell'allegato / the abstract is in the attachment
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Non-perennial streamflow & geomorphic patterns in a semi-arid rangeland slated for development
… these impacts can be difficult, especially for non-perennial streams in semi-arid rangelands. Non-perennial streams tend to lack a historical baseline with complete records of streamflow presence and absence. A historical pre-development baseline allows for better consideration when making …
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The spatiotemporal dynamics of bacterial and fungal abundance in Great Plains non-perennial streams
Non-perennial streams comprise approximately 50% of global stream length and 59% across the continental U.S. Non-perennial streams are also predicted to become more common, since increased length and time of drying in rivers and streams is a widespread symptom of climate change. These substantial …
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Form and function: quantifying geomorphic heterogeneity and drivers in dryland non-perennial river corridors
Non-perennial rivers, including intermittent rivers and ephemeral streams, comprise the majority of drainage networks globally. However, ephemeral streams remain understudied compared to perennial counterparts, and the majority of extant studies focus on in-channel dynamics. Floodplains along …
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Investigating the role of groundwater - surface water connectivity in supporting non-perennial river systems, Sandveld, Western Cape, South Africa
Non-perennial rivers are characterised by a discontinuous and variable hydrological flow regime which may retreat to form isolated pools along the watercourse during prolonged dry periods. The resulting spatio-temporal variability in hydrological characteristics provides support for a variety of …
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Investigation of factors influencing borehole yields in the Nzhelele-Makhado Area in Limpopo Province, South Africa
… The high yields in boreholes closer to non-perennial streams compared to perennial rivers is due to the fact that non-perennial streams are comprised of thick layer of overburden capable of supporting high yielding boreholes, whereas the overburden along the perennial rivers are washed …
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Headwater stream network connectivity: biogeochemical consequences and carbon fate
… have been under- examined compared to dendritic, perennial streams. This oversight complicates efforts to identify biogeochemical patterns at larger scales. This dissertation sets out to expand our knowledge of stream biogeochemical responses to variable connections both within the channel and the …
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A geochemical investigation of the Lake Sibiya system, Northern Zululand
… A water sample was also· collected from the non-perennial Mseleni River, although the river is known to contribute minimally to the lake volume. The majority of laboratory analyses were conducted within the Department of Geological Sciences at the University of Cape Town, adhering to standard …
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Spatio-temporal change in riparian woodlands of the Kruger National Park: drivers and implications
… cover for 18 approx. 10 km long sites along five perennial and nine non-perennial rivers in KNP. This change was compared in a multivariate time-series with river flow and rainfall data from nearby gauging and weather stations, respectively. Particular attention was paid to cumulative flow …
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The partitioning and mobility of metals in the Blesbokspruit
… 1930, the Blesbokspruit was altered from a non-perennial to a perennial stream and a wetland due to the construction of roads and embankments as well as the discharge of mine effluent. Various studies have highlighted the detrimental impact South African gold mines and their slimes dams have …
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Tolerating climate change: a study on the influence of thermal history on thermal tolerance of Galaxias zebratus in rivers of the Cape Peninsula, South Africa
… water abstraction, pollution and impacts of non-native species, climate change is predicted to further exacerbate negative impacts on fish communities. The endemic CFR fish species, Cape Galaxias, Galaxias zebratus Castelnau, 1861, is widespread throughout the region, and occurs in both …
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Molecular screening of potential bat-borne hantavirus and determination of species richness and composition of bats in selected habitats within the woodland and savanna biomes in Namibia
… Habitats characterised by riparian vegetation, non-perennial riverine vegetation, and semi-urban environments were up to four times more species rich than other habitats. These habitats may represent important areas that support high species richness of bats characterised by variable patterns of …
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Geohydrological studies of the Western Shores of lake St Lucia
… salinity of St Lucia, most of these rivers are non-perennial and have been exploited by developments within their catchments. In this study the aquifer system of the southern portion of the western shores area of Lake St Lucia is delineated with the specific intention of defining the coastal …