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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
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| 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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