Ralph Cheng or Ralph T. Cheng U.S. Geological Survey -- Access USGS

Links to Real-Time Physical Oceanographic and Wind Data:

-- San Francisco Bay Physical Oceanographic Real-Time System (SFPORTS)

-- Real-Time Wind Pattern over San Francisco Bay Region

Links to Recent presentations:

-- Seminar, USGS Alaska Science Center, Anchorage, AK March 15, 2005
UnTRIM Modeling of Environmental Flows in Rivers, Lakes and Estuaries
An Introduction to UnTRIM Model
Animation of flood routing through White River, AR

-- USGS Seminar, Reston, VA January 7, 2005
Physics, Measurements, and Numerical Modeling of Wind-Driven Circulation
in Upper Klamath Lake, Oregon

-- WRD Seminar, Menlo Park, CA December 2, 2004
Physics, Measurements, and Numerical Modeling
-- The Italian Connections
Streaming Video of the seminar, 1 hour and 5 minutes

-- Seminar Presented at SPAWAR, U. S. Navy, San Diego, CA March 24, 2004
Two Tales of UnTRIM Applications
The River Plume Problem and Upper Klamath Lake Circulation

Modeling a Three-dimensional River Plume over Continental Shelf
uisng a 3D Unstructured Grid Model (Download)

-- Seminar Presented at Department of Water Resources, State of California, Sacramento, CA March 11, 2004
The UnTRIM Model for Rivers Lakes, and Estuaries
An Introduction to UnTRIM Model
Evaluation of the UnTRIM Model for 3D Tidal Circulation (Download)

National Research Program:
Estuarine Hydrodynamics

(proj chief pict)

Project Chief: Ralph T. Cheng

US Geological Survey MS-496
Water Resources Division
345 Middlefield Rd
Menlo Park, CA 94025

Phone: (650) 329-4500
Fax: (650) 329-4327
e-mail: rtcheng@usgs.gov


Curriculum Vita
Selected Publications (last 6 years)


Major Research Topics and Objectives:
  • Estuarine Hydrodynamic Processes and Numerical Modeling:

  • San Francisco Bay PORTS (A partnerhip with NOAA)

  • Three-Dimensional (3-D) Riverine and Estuarine Hydrodynamics:
    a. Enhancement of an Unstructured Grid TRIM model (UnTRIM)
    b. 3-D Application of the UnTRIM to model San Francisco Bay
    c. Applications of the UnTRIM model for 3D flow in river channels
    d. Collection and analysis of 3-D field data in rivers and estuaries
    e. Investigation of turbulence mixing by numerical model and supported by measurements

  • USGS Hydro-21 Committee -- An Update of Activities
    Defining Hydrologic Instrumentation for the 21-st Century

    WHY: Background and Motivations
    WHO: Hydro-21 Committee
    WHAT: Objectives

    To provide vision and leadership in WRD, USGS for identifying and evaluating new technologies that might have potentials to change the paradigm in WRD data collection program.

    View a Power-Point Presentation of the Missions and Updates of Hydro-21


    • Partial List of research collaborators:

    1. Jeffrey W. Gartner ,NRP, WRD, USGS
    2. Richard E.Smith NRP, WRD, USGS
    3. Chad A. English NRP, WRD, USGS
    4. Vincenzo Casulli, University of Trento, ITALY
    5. Guenther Lang, BAW, Hamburg, Germany
    6. Harry Wang, Virginia Institute of Marine Science (VIMS)
    7. Jen Shen, Virginia Institute of Marine Science (VIMS)
    8. P. F. Wang, SPAWAR, U. S. Navy, San Diego, CA
    9. Kenneth Richter, SPAWAR, U. S. Navy, San Diego, CA
    10. Peter E. Smith, California District, WRD, USGS

    Collection of Photos

    HYdro-21: Selecting a Field Site on the East Coast

    Photos of CODAR/USGS Experiment

    Photos of Cruise 9/9/99

    Photos of Prof. Okuno's Visit

    Photos of Sending Chad Off to Grad School

    Curriculum Vita

    For more information, please send e-mail to: Ralph T. Cheng

    U.S. Geological Survey -- Access USGS -- Environmental Research -- California Water Resources
    The URL of this page is http://sfports.wr.usgs.gov/rtcheng
    Is updated by Ralph T. Cheng
    Last Updated April 18, 2005 Thanks for visiting!