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    Current flood risk assessments for ring levee systems may be inaccurate. A new method using synthetic storms provides a more precise estimation of interior flood depths and potential damage in coastal areas.

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    Area of Science:

    • Coastal engineering
    • Hydrology
    • Risk assessment

    Background:

    • Current U.S. Army Corps of Engineers methods estimate flood risk in ring levees by modeling surge exceedances at discrete points.
    • This approach may oversimplify storm impacts, as simultaneous extreme surge levels across an entire levee system are improbable.
    • Inaccurate flood depth probabilities can lead to significant under or overestimations of potential damage, particularly in vulnerable regions like coastal Louisiana.

    Purpose of the Study:

    • To compare two distinct methodologies for estimating interior flood depth exceedances within ring levee systems.
    • To identify and quantify differences in projected flood depths and economic damages between the two approaches.
    • To advocate for a more robust method for risk-based design standards in coastal flood protection.

    Main Methods:

    • Method 1: Traditional approach estimating surge exceedances at boundary points and modeling resultant overtopping volumes and interior flood depths.
    • Method 2: Preferred approach simulating a diverse set of synthetic storms, modeling each individually, and weighting results by storm likelihood to derive empirical flood depth distributions.
    • Both methods were applied to analyze storm surge flooding within multiple Louisiana protection systems.

    Main Results:

    • Significant differences were observed in estimated flood depth exceedances and projected economic damages between the two modeling approaches.
    • Even minor variations in predicted flood depths (less than 0.2 m) resulted in substantial discrepancies in damage assessments.
    • The synthetic storm approach offers a more comprehensive understanding of flood risk by accounting for storm variability and geospatial characteristics.

    Conclusions:

    • The traditional point-based surge exceedance method may not accurately represent interior flood risk probabilities for ring levee systems.
    • The coupled dynamics approach, utilizing synthetic storms, provides a more realistic estimation of flood depth distributions and associated damages.
    • This study highlights the need for advanced modeling techniques to inform effective, risk-based design standards for coastal flood defenses.