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07020500 Mississippi River at Chester

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SIMULATION OF FLOW AND EVALUATION OF BRIDGE SCOUR AT HORSE ISLAND CHUTE BRIDGE NEAR CHESTER, ILLINOIS WRIR 01-4176

Link to weather for Chester, Illinois, Forecast

 

 

DESCRIPTION OF STUDY AREA

The study reach and surrounding area begins near river mile 108 and ends near river mile 111 on the Mississippi River, near Chester, Illinois. The total width of the Mississippi River floodplain throughout this reach is roughly 5 miles. Horse Island dissects an old river channel which empties into the Mississippi River toward the upper end of the reach.  The southern most fork of the old dissected river channel is known as Horse Island Chute which is crossed by MoDOT overflow structure L-1004R1 on Missouri State Highway 51.

OBJECTIVE

The objective of this study was to quantify hydraulic parameters and subsequent scour through the overflow structure crossing Horse Island Chute.  Due to the confluence of Horse Island Chute with the Mississippi River, it was necessary to acknowledge a two-dimensional, Finite Element Surface-Water Modeling System (FESWMS) numerical model to determine hydraulic parameters needed for an evaluation of potential pier, contraction, and abutment scour. 

RESULTS

Scour computations were developed by the U.S. Department of Transportation, Federal Highway Administration presented in Hydraulic Circular 18.  Three simulations were analyzed in this study.  A measured simulation was considered for calibration of observed conditions (944,000 CFS), a maximum discharge simulation was considered for the record peak discharge (1,000,000 CFS), and an impendent discharge was considered for the case of impending road overflow (894,000 CFS) at Horse Island Chute Bridge.

Study Reach Description
Finite Element Mesh
Land Use Coverage 
Table of Material Properties 

Hydraulic Results
Water Surface Profile-Measured Discharge
Simulated Water Surface Elevation-Measued Discharge
Simulated Water Surface Elevation-Maximum Discharge
Simulated Water Surface Elevation-Impendent Discharge
Simulated Velocity Magnitude-Maximum Discharge
Table of Final Results for Three Discharges 

Scour Results
Total Scour Depths for all Discharges
Table of Contraction Scour Depth Parameters and Results
Table of Pier Scour Depth Parameters and Results
Table of Abutment Scour Depth Parameters and Results

Photos — Courtesy of the U.S. Army Corps of Engineers, St. Louis, Missouri.

Photo-Mississippi River at Chester, July 20, 1993.   Photo-Mississippi River at Chester, July 22, 1993, Bois Brule Levee Break approximately 12 miles downstream of Horse Island Chute Bridge.   Photo-Mississippi River at Chester, July 24, 1993.   Photo-Mississippi River at Chester, July 25, 1993.
MISSISSIPPI RIVER AT CHESTER, JULY 20, 1993.   MISSISSIPPI RIVER AT CHESTER, JULY 22, 1993, BOIS BRULE LEVEE BREAK APPROXIMATELY 12 MILES DOWNSTREAM OF HORSE ISLAND CHUTE BRIDGE.

  MISSISSIPPI RIVER AT CHESTER, JULY 24, 1993.   MISSISSIPPI RIVER AT CHESTER, JULY 25, 1993.
             
Photo,  Mississippi River at Chester, July 26, 1993, note inundation east of levee 4 days after levee break.   Photo-Mississippi River at Chester, July 28, 1993, note inundation east of levee 6 days after levee break.   Photo-1994 Infrared Image of Horse Island Chute Confluence.   Photo-1997 Oblique Image of Horse Island Chute Confluence.
MISSISSIPPI RIVER AT CHESTER, JULY 26, 1993, NOTE INUNDATION EAST OF LEVEE 4 DAYS AFTER LEVEE BREAK   MISSISSIPPI RIVER AT CHESTER, JULY 28, 1993, NOTE INUNDATION EAST OF LEVEE 6 DAYS AFTER LEVEE BREAK   1994 INFRARED IMAGE OF HORSE ISLAND CHUTE CONFLUENCE   1997 OBLIQUE IMAGE OF HORSE ISLAND CHUTE CONFLUENCE
             
Photo-1994 Infrared Image of Old River Channel and Horse Island Chute.   Photo-1994 Infrared image of Horse Island Chute Bridge and Mississippi River.   Photo-1997 Oblique Image of Horse Island Chute Confluence.   Photo-1997 Oblique Image of Old River Channel  Confluence above Horse Island Chute Bridge.
1994 INFRARED IMAGE OF OLD RIVER CHANNEL AND HORSE ISLAND CHUTE   1994 INFRARED IMAGE OF HORSE ISLAND CHUTE BRIDGE AND MISSISSIPPI RIVER   1997 OBLIQUE IMAGE OF HORSE ISLAND CHUTE CONFLUENCE   1997 OBLIQUE IMAGE OF OLD RIVER CHANNEL CONFLUENCE ABOVE HORSE ISLAND CHUTE BRIDGE

For more information contact:
Paul H. Rydlund, Hydrologist  or  Richard J. Huizinga, Hydrologist
U.S. Geological Survey-WRD
1400 Independence Road, MS-100
Rolla, MO 65401
Telephone: (573) 308-3664
Fax: (573) 308-3645

 

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