Thesis: Geomorphology of the Guadalupe River

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¶ … geomorphologic information available on the Guadalupe River in Texas. The Guadalupe River is located in central Texas and is comprised by a mixed alluvial-bedrock channel with limestone bedrock "slightly incised and covered with a spatially discontinuous veneer of fine and coarse alluvial deposits that varies in thickness. (Keen-Zebert, 2007) the underlying geologic units of the Guadalupe river channel are stated to be "Pleistocene fluvial deposits and Cretaceous limestone." (Keen-Zebert, 2007) there are variations of geomorphologic evidence in the Guadalupe river channel region.

Geomorphology of the Guadalupe River

Geomorphology of the Guadalupe River

The Upper Guadalupe River

Observational Reports

Upper Guadalupe River Bar

The Guadalupe River region

Bibliography

Geomorphology of the Guadalupe River

INTRODUCTION

The Guadalupe River in Texas is 25,231 square kilometers in size in the drainage basin area. This is much shallower than the majority of U.S. rivers although there are a few smaller and approximately the same size. Land-use in terms of forest cover is 0% as compared to most rivers in the U.S. most of which are to a great extent forest-use area. Reports state that the Geomorphology of the river floodplain systems can be altered in terms of "magnitude, frequency, duration, timing and sediment loads of floods known to shape floodplain as well as its features and functions. (Keen-Zebert, 2007, paraphrased) by regulated streamflow.

The Guadalupe River, in central Texas is comprised by a mixed alluvial-bedrock channel with limestone bedrock slightly incised and covered with a spatially discontinuous veneer of fine and coarse alluvial deposits that varies in thickness." This area of the Guadalupe River is pictured in the following illustration labeled Figure 2 in this study.

Figure 1

Shaded Relief of Upper Guadalupe River Watershed

Keen-Zebert, 2007

It is reported that the underlying geologic units of the Guadalupe river channel are "Pleistocene fluvial deposits and Cretaceous limestone." (Keen-Zebert, 2007) Five primary geologic units appear in the surficial geology of the Guadalupe River and from youngest to oldest are stated to include the Fluvaiatile Terrace Deposits Formation (comprised of gravel, sand, silt and clay ranging from 9 to 15 m thick).

Also included is the Trinity Aquifer group which contains all limestones. The Glenn Rose Limestone (upper and lower members) are inclusive with the upper members comprised of alternating beds of thicker, more cemented hardened limestone and thicker soft, marley slightly clayey limestone; (5) Lower member -- massive fossilferous limestone with thin beds of limestone, dolomite, marl and shale. (Keen-Zebert, 2007, paraphrased) it is reported that the Hensell Sand and Cow Creek limestone are "both members of the Travis Peak Formation." The Hensell Sand Member is a red to gray clay, silt, sand conglomerate with thin beds of limestone. The Cow Creek limestone is a fossilferous dolomitic limestone with thinly bedded layers of shale, sand, and lignite. Several locations on the river have two lithologies in cross section where the river flows on a naturally boundary between the two units." (Keen-Zebert, 2007) the following illustration labeled Figure 1 in this study lists the 'Channel type' and 'Geologic Units' on the Guadalupe River.

Figure 3

Channel Type and Geologic Units on the Guadalupe River

Keen-Zebert, 2007

II. The Upper Guadalupe River

The Upper Guadalupe River is reported to be comprised of a mixed alluvial-bedrock channel and instead of the thin alluvium veneer that is observed quite frequently in bedrock dominant channels, the veneer is reported to be thick in spots and providing some channel reaches with an alluvial character. The channel is stated to have "...downcut into its floodplain and the banks are composed of fine-grained alluviaum that ranges from none at all toe approximately 8 meters thick." (Keen-Zebert, 2007)

These more alluvial-tending reaches are reported to be "interspersed with bedrock-tending reaches." (Keen-Zebert, 2007) These reaches are stated to be a closer fit to the bedrock river profile where "greater than 50% of the boundary is exposed bedrock, incision not bedrock is more significant, and the channel is bounded by steep limestone bluffs." (Keen-Zebert, 2007)

III. Observational Reports

Observation has rendered reports of the following erosional features:

(1) longitudinal grooves;

(2) knockpoints,

(3) potholes; and (4) quarrying scars; and (5) sediment deposits… [END OF PREVIEW]

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