MEASUREMENTS OF TIDAL EFFECTS ON STAGE AND DISCHARGE ON THE JOURDAN AND PASCAGOULA RIVERS NEAR THE MISSISSIPPI GULF COAST

by P.C. Floyd

Prepared by the U.S. Geological Survey in cooperation with the Mississippi Department of Transporation

1997

CONTENTS

Introduction
Descriptions of measurement locations
    Jourdan River
    Pascagoula River
Description of Tidal Effects on Discharge
    Jourdan River
    Pascagoula River
Results
    Jourdan River
    Pascagoula River

FIGURES

1. Location of discharge measurement section on the Jourdan River near U.S. Interstate Highway 10 near the Mississippi Gulf Coast

2. Location of discharge measurement sections on the Pascagoula River system near U.S. Interstate Highway 10 near the Mississippi Gulf Coast

3. Stage-discharge hydrograph for the Jourdan River near U.S. Interstate Highway 10 near the Mississippi Gulf Coast (September 19-20, 1996)

4. Stage-discharge hydrograph for the Pascagoula River near U.S. Interstate Highway 10 near the Mississippi Gulf Coast (September 21-22, 1996)

5. Plot of data from Acoustic Doppler Current Profiler measurement showing bi-directional flows at Jourdan River near U.S. Interstate Highway 10

ABSTRACT

During September 19-22, 1996, the U.S. Geological Survey (USGS) measured stages and discharges on the Jourdan and Pascagoula Rivers near U.S. Interstate Highway 10 (I-10) near the Mississippi Gulf Coast (figs. 1, 2). These mea- surements were made in cooperation with the Mississippi Department of Transporation and are being used to better understand how tides affect river flows and brige hy- draulics in the gulf coast region.

Discharge measurements were made continuously at both sites during low-flow conditions throughout a complete tidal cycle when river stages and discharges were con- trolled primarily by the tides. Temporary staff gages were installed at each site and datums were established. River stages were determined from the staff gage readings during each measurement. The data collected during these two studies are summarized in this report.


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