CS34 River Dynamics
Date: Wednesday, June 12, 2002
Location: Poster Session - VCC
 
HagertheySE, University of Alabama, Tuscaloosa, USA, shagerth@bsc.as.ua.edu
Ward, A, K, University of Alabama, Tuscaloosa, USA, award@biology.as.ua.edu
Ward, G, M, University of Alabama, Tuscaloosa, USA, mward@biology.as.ua.edu
Pritchard, K, H, University of Alabama, Tuscaloosa, USA, kpritcha@biology.as.ua.edu
Smith, K, M, University of Alabama, Tuscaloosa, USA, 
 
FLUVIAL TRANSPORT OF PARTICULATE AND DISSOLVED MATTER IN TRIBUTARIES OF THE MOBILE RIVER SYSTEM AS REGULATED BY GEOLOGY AND LANDUSE
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The Cahaba River and Sipsey River are the only remaining large, unimpounded rivers in the Alabama Mobile River Basin. However, the rate of landuse changes within these basins (e.g., urban development, logging, agriculture, and mining) continues to increase and ultimately threatens the astounding diversity of fishes, mollusks, and insects of Alabama rivers. To predict the impact of increased sediment and nutrient delivery associated with these changes, we assessed the geological setting and human landuse activities on promoting the transport of particulate and dissolved materials. Results indicate that elevated nutrient levels were associated with urban development whereas detrimental impacts associated with other landuse activities were not detected. Two geologic signals were identified. First, sites situated in shale belonging to the Pottsville Formation tended to have high alkalinity and specific conductance. Second, suspended particulate material (SPM) increased as the rivers traversed the upper geologic regions into the coastal plain. Stream discharge accounted for part of the seasonal variability in particulate and dissolved matter.