| Title: | Integrated hydrologic-hydrodynamic modeling of estuarine-riverine flooding: 2008 Tropical Storm Fay |
| Authors: | Bacopoulos, P., Y. Tang, D. Wang and S.C. Hagen |
| Year: | 2017 |
| Journal: | Journal of Hydrologic Engineering |
| Volume (Issue): | 22(8) |
| Pages: | |
| Article ID: | 04017022 |
| DOI: | 10.1061/(ASCE)HE.1943-5584.0001539 |
| URL (non-DOI journals): | |
| Model: | SWAT |
| Broad Application Category: | hydrologic only |
| Primary Application Category: | model and/or data interface |
| Secondary Application Category: | hydrologic assessment |
| Watershed Description: | 7000 km^2 St. Johns River, which drains to the Atlantic Ocean in northeast Florida, U.S. |
| Calibration Summary: | |
| Validation Summary: | |
| General Comments: | |
| Abstract: | Soil and water assessment tool (SWAT) and advanced circulation (ADCIRC) models were integrated to generate a hydrologic
(SWAT)–hydrodynamic (ADCIRC) model applicable for flood prediction in coastal areas. The model is applied to the lower St. Johns River
Basin for a holistic postevent analysis of Tropical Storm Fay (2008). Validation of the model is presented, followed by physical-forcing
and temporal assessments of inundation within the river-adjacent watershed basins. The model validation and inundation assessment
demonstrates the need to apply watershed runoff as an additional boundary condition in order to more fully capture the peak surge and
recession, which added ∼0.5 m to storm tide elevation in the lower St. Johns River, extended the surge recession by nearly 5 days, and
increased the inundated watershed area by almost 50%. Watershed inundation ranges between ∼33 km2 for normal tide conditions
and ∼150 km2 for an approximate 1-in-100-year event (Tropical Storm Fay). Implementation of the approach requires careful definition
of the SWAT-ADCIRC interfaces at tributaries and river offshoots, which for the case of the lower St. Johns River Basin was accomplished
with 8 inflow boundary condition locations. Other details of the approach are discussed, and general guidance for application to other
estuaries is provided. |
| Language: | English |
| Keywords: | Flooding; Estuaries; Storm tide; Watershed runoff; Numerical modeling; Coupling |