Effects of reducing river flow on pulse residence time in Little Manatee River, USA

Wenrui Huang; Xiaohai Liu

doi:10.1007/s12209-009-0017-2

Transactions of Tianjin University ›› 2009, Vol. 15 ›› Issue (2) : 95 -100. DOI: 10.1007/s12209-009-0017-2

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Effects of reducing river flow on pulse residence time in Little Manatee River, USA

Wenrui Huang ¹^,^a
, Xiaohai Liu ¹

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Abstract

Residence time is an important indicator for river environmental management. In this paper, a 3D hydrodynamic model has been successfully applied to Little Manatee River to characterize the mixing and transport process and residence time. The model employs horizontal curvilinear orthogonal grids to represent the complex river system that consists of branches and bayous. The model has been satisfactorily calibrated and verified by using two continuous data sets. The data sets consist of hourly observations of all forcing boundaries, including freshwater inputs, tides, winds, salinity and temperatures at bay boundary, and air temperatures for model simulations. The data sets also consist of hourly observations of water levels, salinity, and temperature at several river stations. The calibrated and verified hydrodynamic model was used to predict residence time in the Little Manatee River. Under the minimum flow of 0.312 m³/s, the pulse residence time (PRT) is 108 days. Model simulations were also conducted for 17 flow scenarios. Empirical regression equations have been satisfactorily derived to correlate PRT to freshwater inflow. Correlation coefficient R ² is 0.982 for PRT.

Keywords

hydrodynamic modeling / estuary / residence time / tidal river

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Wenrui Huang, Xiaohai Liu. Effects of reducing river flow on pulse residence time in Little Manatee River, USA. Transactions of Tianjin University, 2009, 15(2): 95-100 DOI:10.1007/s12209-009-0017-2

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