Optimization_Stdy_Batiquitos_Lagoon_Bridge_Apr12
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Optimization_Stdy_Batiquitos_Lagoon_Bridge_Apr12
BATIQUITOS LAGOON BRIDGE OPTIMIZATION STUDYFinal ReportInterstate 5 North Coast Corridor Project SAN DIEGO COUNTY, CALIFORNIA DISTRICT 11-SD-5 (PM R28 Optimization_Stdy_Batiquitos_Lagoon_Bridge_Apr128.4/R55.4)EA 235800 (P ID 11-000-0159)41000Batiquitos LagoonBridge Optimization studyFinal Report41000Prepared for: Dokken Engineering andThe California Department of TransportationPrepared by:MH moffott & nichol 3780 Kilroy Airport Way Suite 600 Long Beach, CA 90806moffott ft nichoiEXECUTIVE SUMMAR Optimization_Stdy_Batiquitos_Lagoon_Bridge_Apr12YFor the past several years, the California Department of Transportation (Caltrans) and the San Diego Association of Governments (SANDAG) have been woOptimization_Stdy_Batiquitos_Lagoon_Bridge_Apr12
rking on the development and implementation of a large-scale transportation improvement project In Northern San Diego County known as the Interstate 5BATIQUITOS LAGOON BRIDGE OPTIMIZATION STUDYFinal ReportInterstate 5 North Coast Corridor Project SAN DIEGO COUNTY, CALIFORNIA DISTRICT 11-SD-5 (PM R28 Optimization_Stdy_Batiquitos_Lagoon_Bridge_Apr12nty. The project will include new bridge structures across most of the lagoons. Including Batiquitos Lagoon. The objective of this study is to evaluate a range of channel widths and depths under the 1-5 and Railroad (RR) bridges These evaluations will be used to determine bridge length and to identi Optimization_Stdy_Batiquitos_Lagoon_Bridge_Apr12fy a combination of channel widths and depths that provides the most favorable conditions for conveyance of tides and stormflows throughout the lagoonOptimization_Stdy_Batiquitos_Lagoon_Bridge_Apr12
.The TABS2 numerical modeling system, including the RMA-2 hydrodynamic model and the RMA-4 water quality model, was used for this study A finite elemeBATIQUITOS LAGOON BRIDGE OPTIMIZATION STUDYFinal ReportInterstate 5 North Coast Corridor Project SAN DIEGO COUNTY, CALIFORNIA DISTRICT 11-SD-5 (PM R28 Optimization_Stdy_Batiquitos_Lagoon_Bridge_Apr12 recorded in the lagoon in July 2008 The calibrated and verified numerical model was then used in the channel dimensions optimization modeling. The RMA-4 model was used in this study to predict the residence time The dispersion coefficients used in the RMA-4 model are based on modeling calibrations Optimization_Stdy_Batiquitos_Lagoon_Bridge_Apr12performed for other similar lagoons, as no data are available from Batiquitos Lagoon for calibration.The selection of optimum channel widths and depthOptimization_Stdy_Batiquitos_Lagoon_Bridge_Apr12
s for bridge lengths was based on a sensitivity analysis conducted for each bridge crossing under 1) typical dry weather tidal fluctuations and 2) extBATIQUITOS LAGOON BRIDGE OPTIMIZATION STUDYFinal ReportInterstate 5 North Coast Corridor Project SAN DIEGO COUNTY, CALIFORNIA DISTRICT 11-SD-5 (PM R28 Optimization_Stdy_Batiquitos_Lagoon_Bridge_Apr12nd ecosystem. Extreme flood elevations were used to evaluate the high water surface elevations in the lagoon in comparison with bridge soffit elevations, although potential flooding of adjacent areas is not currently an issue at Batiquitos Lagoon. Using these indicators, the optimum channel width an Optimization_Stdy_Batiquitos_Lagoon_Bridge_Apr12d depth at each bridge were Identified as the point at which tidal range and flood conveyance are most favorable and further increases in channel widtOptimization_Stdy_Batiquitos_Lagoon_Bridge_Apr12
h and depth result in only minimal benefit. The tidal inlet under the Carlsbad Boulevard bridges was originally sized and designed to achieve a stableBATIQUITOS LAGOON BRIDGE OPTIMIZATION STUDYFinal ReportInterstate 5 North Coast Corridor Project SAN DIEGO COUNTY, CALIFORNIA DISTRICT 11-SD-5 (PM R28 Optimization_Stdy_Batiquitos_Lagoon_Bridge_Apr12urther optimization is required for that channel.Table ES-1 presents the existing and optimum channel widths and depths for the I-5 and RR Bridges.CALTRANS Bridge Optimization StudyBatiquitos Lagoon41000Ibù'molfoH ik nlchoiTable ES-1 Summary of Existing and Optimized Channel DimensionsInfrastructure Optimization_Stdy_Batiquitos_Lagoon_Bridge_Apr12Recommended Based on OptimizationDesign ConditionChannel Invert (ft)Bottom Width (ft)Channel Invert (ft)Bottom Width (ft)NGVDMLLWNGVDMLLWInlet-8.0-5.7Optimization_Stdy_Batiquitos_Lagoon_Bridge_Apr12
96-8.0-5.796RR-7.0•4.7202-7.0•4.7162I-5-7.0-4.7134-7.0-4.766Key findings from the optimization modeling study are summarized belowBATIQUITOS LAGOON BRIDGE OPTIMIZATION STUDYFinal ReportInterstate 5 North Coast Corridor Project SAN DIEGO COUNTY, CALIFORNIA DISTRICT 11-SD-5 (PM R28BATIQUITOS LAGOON BRIDGE OPTIMIZATION STUDYFinal ReportInterstate 5 North Coast Corridor Project SAN DIEGO COUNTY, CALIFORNIA DISTRICT 11-SD-5 (PM R28Gọi ngay
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