HR: 1400h
AN: H33B-02    [Abstracts]
TI: Interactions Between Flow Patterns and Infrastructure in an Urban Stream
AU: * Lindner, G A
EM: glind1@umbc.edu
AF: Dept. of Geography and Environmental Systems University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, United States
AU: Miller, A J
EM: miller@umbc.edu
AF: Dept. of Geography and Environmental Systems University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, United States
AB: Channel form and flow pattern in urban streams are often strongly influenced by the configuration of urban infrastructure, with potential consequences for flowpaths, residence times, and biogeochemical cycling. Although there is a common perception that urban channels are characterized by simplified geometry and loss of habitat complexity, in some cases culverts and other in-channel structures may add hydraulic complexity and lengthen residence times for water and associated constituents. In this study we examine the influence of in- channel structures on longitudinal profiles and configuration of pools and riffles in two urban streams reflecting different periods of historical development and different practices with respect to stormwater management and encroachment on the riparian corridor. The analysis involves using a 2-D depth-averaged finite difference hydraulic model to simulate travel and residence times and flow patterns over a range of stages along stream reaches in the Dead Run and Red Run tributaries of Gwynns Falls, in the main study watershed of the Baltimore Ecosystem Study. This research seeks to assess 1) varying sensitivity of flow patterns and residence times to the influence of in-channel structures with changes in flow stage, and 2) differences in the relative influence of infrastructure in watersheds with differing age of development and management practices.
DE: 1821 Floods
DE: 1830 Groundwater/surface water interaction
DE: 1834 Human impacts
DE: 1847 Modeling
SC: Hydrology [H]
MN: 2009 Joint Assembly