Lerczak James A.

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Lerczak
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James A.
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  • Article
    The evolution of a buoyant river plume in response to a pulse of high discharge from a small midlatitude river
    (American Meteorological Society, 2020-07-01) Lemagie, Emily ; Lerczak, James A.
    A unique feature of small mountainous rivers is that discharge can be elevated by an order of magnitude during a large rain event. The impact of time-varying discharge on freshwater transport pathways and alongshore propagation rates in the coastal ocean is not well understood. A suite of simulations in an idealized coastal ocean domain using the Regional Ocean Modeling System (ROMS) with varying steady background discharge conditions (25–100 m3 s−1), pulse amplitude (200–800 m3 s−1), pulse duration (1–6 days), and steady downwelling-favorable winds (0–4 m s−1) are compared to investigate the downstream freshwater transport along the coast (in the direction of Kelvin wave propagation) following a discharge pulse from the river. The nose of the pulse propagates rapidly alongshore at 0.04–0.32 m s−1 (faster propagation corresponds with larger pulse volume and faster winds) transporting 13%–66% of the discharge. The remainder of the discharge volume initially accumulates in the bulge near the river mouth, with lower retention for longer pulse duration and stronger winds. Following the pulse, the bulge eddy disconnects from the river mouth and is advected downstream at 0–0.1 m s−1, equal to the depth-averaged wind-driven ambient water velocity. As it transits alongshore, it sheds freshwater volume farther downstream and the alongshore freshwater transport stays elevated between the nose and the transient bulge eddy. The evolution of freshwater transport at a plume cross section can be described by the background discharge, the passage of the pulse nose, and a slow exponential return to background conditions.
  • Dataset
    Hudson River estuary 2004 field experiment
    (Woods Hole Oceanograpic Institution, 2023-08-08) Lerczak, James A. ; Ralston, David K. ; Geyer, W. Rockwell ; Conley, Margaret M.
    This dataset includes data from moorings and shipboard observations in the Hudson River estuary during the spring and summer of 2004. The moorings were deployed in the thalweg at 7 sites for 108 days and included a combination of bottom temperature, conductivity, and pressure measurements as well as upward-looking ADCPs. Each mooring site also had near-surface temperature and conductivity measurements. Shipboard CTD surveys were carried out along the estuary on 7 days just after the deployment and just before the recovery of the moorings.
  • Dataset
    Hudson River estuary 2002 field experiment: moorings
    (Woods Hole Oceanographic Institution, 2023-09-20) Geyer, W. Rockwell ; Chant, Robert J. ; Houghton, Robert ; Lerczak, James A. ; Hunter, Elias J. ; Conley, Margaret
    This dataset includes data from moorings deployed in the Hudson River estuary during the spring of 2002. The moorings were deployed at Spuyten Duyvil for 43 days and included a cross-channel array of temperature and conductivity sensors as well as 4 upward-looking ADCPs and 2 pressure sensors flanking the channel.