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iDEA: Drexel E-repository and Archives > Drexel Academic Community > College of Engineering > Department of Civil, Architectural,and Environmental Engineering > Proceedings of the 7th International Conference on HydroScience and Engineering (ICHE 2006) [ISBN: 0977447405] > Flow stratification due to groundwater inflow in a small urban stream

Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/1413

Title: Flow stratification due to groundwater inflow in a small urban stream
Authors: Ryan, Robert J.
Boufadel, Michel
Keywords: Urban hydrology;Hydrology
Issue Date: 12-Sep-2006
Publisher: Michael Piasecki and College of Engineering, Drexel University
Citation: Proceedings of the Seventh International Conference on Hydroscience and Engineering, Philadelphia, PA, September 2006. http://hdl.handle.net/1860/732
Abstract: Conservative solute tracer experiments were conducted in Indian Creek, a small urban stream located in Philadelphia, Pennsylvania, USA with estimated low flow rates between 50 L s-1 and 70 L s-1. The stream was typically 5.5 m wide and 0.2 m deep. Streams of this size are usually modeled as one-dimensional, assuming that downstream of some initial ""mixing zone"", the stream is completely mixed both vertically and laterally, and remains completely mixed throughout the remainder of the reach of interest. However, we observed vertical stratification of a tracer cloud in a 0.95 m deep by 30 m long pool. The tracer cloud was initially completely mixed both laterally and vertically across the stream prior to entering the pool. We suggest that the cause of limited mixing is due to a balance between groundwater inflow and transverse dispersion at the cross section. We show that the unsupported assumption of complete mixing may result in a wide range, and thus increased uncertainty, of the values of streamflow parameters, and in particular, the longitudinal dispersion coefficient estimated from these data. We conclude that the assumption of complete mixing and one-dimensional modeling must be checked against actual field conditions, even in small streams.
Description: Paper presented at The Seventh International Conference on HydroScience and Engineering (ICHE) hosted by the College of Engineering at Drexel Univeristy on September 10-13, 2006 in Philadelphia, Pennsylvania. The conference theme was IT in the Field of HydroSciences. It included several mini-symposia that emphasized IT topics in HydroSciences and the yearly meeting of the metadata group of the International Oceanographic Data and Information Exchange organization.
URI: http://hdl.handle.net/1860/1413
ISBN: 0977447405
Appears in Collections:Proceedings of the 7th International Conference on HydroScience and Engineering (ICHE 2006) [ISBN: 0977447405]

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