HR: 09:15h
AN: H51G-06    [Abstracts]
TI: Time Series Stream Temperature And Dissolved Oxygen Modeling In The Lower Flint River Basin
AU: * Li, G
EM: Lgy@uga.edu
AF: Guoyuan Li, Warnell School of Forest Resources, University of Georgia, Athens, GA 30602 United States
AU: Jackson, C R
EM: RJACKSON@smokey.forestry.uga.edu
AF: Guoyuan Li, Warnell School of Forest Resources, University of Georgia, Athens, GA 30602 United States
AB: The tributaries of the Lower Flint River Basin (LFRB) are incised into the upper Floridan semi-confined limestone aquifer, and thus seepage of relatively old groundwater sustains baseflows and provides some control over temperature and dissolved oxygen fluctuations. This hydrologic and geologic setting creates aquatic habitat that is unique in the state of Georgia. Groundwater withdrawals and possible water supply reservoirs threaten to exacerbate low flow conditions during summer droughts, which may force negative impacts to stream temperature and dissolved oxygen (DO). To evaluate the possible effects of human modifications to stream habitat, summer time series (in 15 min interval) of stream temperature and DO were monitored over the last three years along these streams, and a Continuously Stirred Tank Reactor (CSTR) model was developed and calibrated with these data. The driving forces of the diel trends and the overall levels of stream temperature and DO were identified by this model. Simulations were conducted with assumed managed flow conditions to illustrate potential effects of various stream flow regimes on stream temperature and DO time series. The goal of this research is to provide an accurate simulation tool to guide management decisions.
DE: 1800 HYDROLOGY
DE: 1806 Chemistry of fresh water
DE: 1871 Surface water quality
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting