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 6 of 6 for “"Ephemeral rivers"”.
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An ephemeral perspective of fluvial ecosystems: Viewing ephemeral rivers in the context of current lotic ecology
Hydrologic and material dynamics of ephemeral rivers were investigated in the Namib Desert to assess how hydrologic regimes shape the physical habitat template of these river ecosystems. An analysis of long-term hydrologic records revealed that the variation in mean annual runoff and peak discharge …
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Ephemeral river systems at the Skeleton Coast, NW-Namibia - Sedimentological and geomorphological studies on the braided river dominated Koigab Fan, the Cenozoic succession in the Uniabmond area and comparative studies on fluvio-aeolian interaction between ephemeral rivers and the Skeleton Coast Erg
… coastline of NW Namibia comprising several ephemeral rivers, which flow west-southwest towards the Atlantic Ocean. The area is hyper-arid with less than 50 mm average annual rainfall and a rainfall variability of 72%. Therefore, the major catchment areas of the rivers are about 100-200 km …
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Hydrogeological investigation of the Naukluft mountains, southwest Namibia
… run-off catchments of the Tsauchab and Tsondab ephemeral rivers; second is the Nama Aquifer, largely stratified aquifer with limited fractures to the east of the Naukluft Karst Aquifer and third, is the Namib Aquifer, which is a porous phreatic aquifer to the west and south of the Naukluft Karst …
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Facies patterns and controls on sedimentation in the Triassic Chinle formation of Northeast New Mexico
… Formation in northeastern New Mexico consists of ephemeral-stream deposits adjacent to the Ancestral Rocky Mountain uplift and perennial braided-stream deposits on the plains to the east. The two fluvial systems were contemporaneous with the ephemeral rivers existing as transverse tributaries to a …
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Water sourcing by riparian tree species in ephemaral rivers
In arid southern Africa, many rivers are ephemeral, and surface flow occurs for less than 10% of the year. Floods, which occur erratically, recharge groundwater resources on which riverine vegetation depends. Trees and shrubs are the most common life forms along these river systems, because surface …
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Top-down or bottom-up?: Impacts of giraffe browse and water abstraction on two keystone tree species of the Kgalagadi Transfrontier Park
… considered as keystone species especially along ephemeral rivers. My focus is on the impact of the introduction of an extralimital megaherbivore, Giraffa camelopardalis, (top-down) and anthropogenic water abstraction (bottom-up) on the reproductive output and vegetation structure of Acacia …