Sediment type distribution in reservoirs: sediment source versus morphometry |
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| Authors: | J Abraham P M Allen J A Dunbar S I Dworkin |
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| Institution: | (1) Department of Geology, Baylor University, Waco, texas 76798, USA e-mail:abraham@earthlogic.baylor.edu, US |
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| Abstract: | Bottom sediments were collected from seven Texas reservoirs to assess the spatial distribution of sediment types in reservoirs.
The sediment samples were analyzed for water content, organic content, and grain-size distributions. The reservoirs are characterized
by distinct water content patterns (referred to in this paper as Types I, II, and III) that reflect the lithologic units comprising
their drainage area. The water content, organic content, and percent mud decreases from Type I (shale, marl) through Type
II (limestone-marl-sandstone) to Type III (granite-gneiss-schist-sandstone) reservoirs. Reported elemental concentrations
in the reservoir sediments are consistent with concentrations in the dominant rocks within their drainage area. While water
depth accounts for part of the spatial distribution, sediment source explains the overall distribution of sediment types.
Coarse-grained source rocks, multiple source rocks, and multiple tributaries which input sediment at different points contribute
to an inconsistent sediment type distribution. Depending on the sediment source, sand and gravel-size sediments are present
in the deeper regions of some reservoirs. This disrupts the classical morphometry (water depth, slope) controlled sediment
distribution pattern (coarser sediments in shallower regions and finer sediments in deeper regions) of natural lakes. Thus,
the location of tributaries and the type of sediments they carry are the dominant factors that control the sediment type distribution
in reservoirs.
Received: 16 June 1998 · Accepted: 24 August 1998 |
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| Keywords: | Reservoir sediments Sediment type Sediment source |
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