(Keen-Zebert, 2007)
Bar types group together spatially in the Upper Guadalupe River. The fluvial landscape of the Upper Guadalupe river is one that is stated to be likely the result of "regional geologic structural controls, large fluctuations in discharge and sediment supply, and the geochemical and mechanical process operating on the channel bed." (Keen-Zebert, 2007) There is a macrochannel in the Guadalupe River that has resulted from "large floods [and] an active channel formed to more common flow conditions.
V. The Guadalupe River region has a 'Mixed Morphology' or to be a 'Hybrid River' in the work of Keen-Zebert (2007) entitled "Bar Spacing in Alluvial and Bedrock Reaches of the Guadalupe River, a Mixed Morphology or Hybrid River in Central Texas" states that the Guadalupe River in Central Texas is a "...mixed or hybrid streamchannel..." which is "shallowing incised into bedrock and largely overlain by thick alluvial deposits." (Keen-Zebert, 2007)
he Guadalupe River's channel distribution type and gravel bars were mapped on 140km and the grain size distribution of bars measured in the field with the bar spacing for the study reaching four times greater than the generally common range for alluvial channels. When comparisons were made between alluvial and bedrock reaches it was found that "although the percent coverage by bars is similar for both types, the bar spacing is five times greater in bedrock reaches than alluvial reaches. In several locations in both channel type reaches, bars are spaced less than one channel width and are grouped together. Grain size distributions show that there is no significant difference between bars that occur in bedrock and alluvial reaches. In the study area, grain size distributions reveal neither downstream fining nor coarsening."( Keen-Zebert, 2007)
Findings of the study state that there were few differences found in bar measurements between alluvial and bedrock reaches." (Keen-Zebert, 2007) in addition it is reported that there is no regular variation in the geologic or channel type in the bar length, density or surface grain size distribution. The Guadalupe River's bars are reported to be "complex landforms...difficult to distinguish from gravel terraces in some cases. Overall, the mixed channel while being comprised of both alluvial and bedrock sections "has...
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