Investigations into spatial and temporal variations in sources of baseflow for mesoscale watersheds (1-100 km2) are relatively unexplored within hydrologic literature. To fill this data gap, this study observed changes in active channel length, flow, and water chemistry in the Birch Creek watershed in the Catskill Mountains. Not unexpectedly, reduced baseflow was related to reduced extent of the active channel network, but the scaling relationship greatly differed between subbasins. Generally, topography can describe flow under wet watershed conditions, however this relationship falls apart as Birch Creek dries out and baseflow becomes the dominant control on streamflow. Comparing baseflow variations to mapped soil, topography, geological features, and water chemistry failed to predict baseflow variations. Thus, spatial variations in baseflow appear to be due to variations in subsurface features that are not captured by standard maps. These results indicate the need for further fieldwork to better understand hydrologic processes at the mesoscale.
|Advisor:||Shaw, Stephen B.|
|Commitee:||Chandler, David G., Daley, Douglas J., Domaszczynski, Piotr|
|School:||State University of New York College of Environmental Science and Forestry|
|Department:||Environmental & Resources Engineering|
|School Location:||United States -- New York|
|Source:||MAI 55/03M(E), Masters Abstracts International|
|Keywords:||Baseflow, Catskill mountains, Groundwater seeps, Hydrologic scaling, Mesoscale watersheds, Stream channel network|
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