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Uchiyama, Y., Kobe University, Kobe, Japan, uchiyama@harbor.kobe-u.ac.jp
Ishii, S., Kobe University, Kobe, Japan, shota070428@gmail.com
Tuy, P., Ritsumeikan University, Kusatsu, Japan, tuy_phan@yahoo.com
Wells, J., Ritsumeikan University, Kusatsu, Japan, jwells@se.ritsumei.ac.jp
Kirkey, W. D., Clarkson University, Potsdam, NY, USA, jbonner@clarkson.edu
Islam, M. S., Clarkson University, Potsdam, NY, USA, jbonner@clarkson.edu
Bonner, J. S., Clarkson University, Potsdam, NY, USA, jbonner@clarkson.edu

TRANSIENT THERMAL PLUME DISPERSAL IN THE HUDSON RIVER ESTUARY

A three-dimensional, transient thermal plume dispersal in the Hudson River estuary is examined with Regional Oceanic Modeling System (ROMS) with an empirical near-field buoyant source submodel for approximately two spring-neap cycles. We focus on the area of 13.4 km x 67.7 km between the USGS monitoring stations at Poughkeepsie and Piermont, resolved by 160 x 800 longitudinally-stretched curvilinear horizontal grids with 20 vertical sigma layers. The Indian Point Power Plant, located about 65 km upstream from the mouth, continuously discharges thermal effluent at 109.8 m^3/s heated by +9.6 deg. C from the intake. The model output is compared with the USGS gauges and HADCP data at West Point to show a reasonable agreement. With a modest mean river discharge, the thermal plume from the plant tends to be restricted near the source location, generally traveling back and forth. However, the topographically-generated eddies and vorticity significantly enhance the mechanical and buoyant mixing. Tidally-driven longitudinal flows are highly skewed in the lateral direction near the bend, leading to substantial secondary circulations.

Oral presentation

Session #:GS01
Date: 7/11/2012
Time: 17:00