Compound flooding in convergent estuaries: insights from an analytical model
<p>We investigate here the effects of geometric properties (channel depth and cross-sectional convergence length), storm surge characteristics, friction, and river flow on the spatial and temporal variability of compound flooding along an idealized, meso-tidal coastal-plain estuary. An analyti...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2022-08-01
|
| Series: | Ocean Science |
| Online Access: | https://os.copernicus.org/articles/18/1203/2022/os-18-1203-2022.pdf |
| _version_ | 1798040374472605696 |
|---|---|
| author | R. Familkhalili S. A. Talke D. A. Jay |
| author_facet | R. Familkhalili S. A. Talke D. A. Jay |
| author_sort | R. Familkhalili |
| collection | DOAJ |
| description | <p>We investigate here the effects of geometric properties (channel depth and
cross-sectional convergence length), storm surge characteristics, friction,
and river flow on the spatial and temporal variability of compound flooding
along an idealized, meso-tidal coastal-plain estuary. An analytical model is
developed that includes exponentially convergent geometry, tidal forcing,
constant river flow, and a representation of storm surge as a combination of
two sinusoidal waves. Nonlinear bed friction is treated using Chebyshev
polynomials and trigonometric functions, and a multi-segment approach is
used to increase accuracy. Model results show that river discharge increases
the damping of surge amplitudes in an estuary, while increasing channel
depth has the opposite effect. Sensitivity studies indicate that the impact
of river flow on peak water level decreases as channel depth increases,
while the influence of tide and surge increases in the landward portion of
an estuary. Moreover, model results show less surge damping in deeper
configurations and even amplification in some cases, while increased
convergence length scale increases damping of surge waves with periods of 12–72 h. For every modeled scenario, there is a point where river discharge
effects on water level outweigh tide/surge effects. As a channel is
deepened, this cross-over point moves progressively upstream. Thus, channel
deepening may alter flood risk spatially along an estuary and reduce the
length of a river estuary, within which fluvial flooding is dominant.</p> |
| first_indexed | 2024-04-11T22:06:45Z |
| format | Article |
| id | doaj.art-06f3ef18d8ad4c0985edf9b93c95511d |
| institution | Directory Open Access Journal |
| issn | 1812-0784 1812-0792 |
| language | English |
| last_indexed | 2024-04-11T22:06:45Z |
| publishDate | 2022-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Ocean Science |
| spelling | doaj.art-06f3ef18d8ad4c0985edf9b93c95511d2022-12-22T04:00:42ZengCopernicus PublicationsOcean Science1812-07841812-07922022-08-01181203122010.5194/os-18-1203-2022Compound flooding in convergent estuaries: insights from an analytical modelR. Familkhalili0S. A. Talke1D. A. Jay2Department of Civil and Environmental Engineering, Old Dominion University, Norfolk, VA, USADepartment of Civil and Environmental Engineering, California Polytechnic State University, San Luis Obispo, CA, USADepartment of Civil and Environmental Engineering, Portland State University, Portland, OR, USA<p>We investigate here the effects of geometric properties (channel depth and cross-sectional convergence length), storm surge characteristics, friction, and river flow on the spatial and temporal variability of compound flooding along an idealized, meso-tidal coastal-plain estuary. An analytical model is developed that includes exponentially convergent geometry, tidal forcing, constant river flow, and a representation of storm surge as a combination of two sinusoidal waves. Nonlinear bed friction is treated using Chebyshev polynomials and trigonometric functions, and a multi-segment approach is used to increase accuracy. Model results show that river discharge increases the damping of surge amplitudes in an estuary, while increasing channel depth has the opposite effect. Sensitivity studies indicate that the impact of river flow on peak water level decreases as channel depth increases, while the influence of tide and surge increases in the landward portion of an estuary. Moreover, model results show less surge damping in deeper configurations and even amplification in some cases, while increased convergence length scale increases damping of surge waves with periods of 12–72 h. For every modeled scenario, there is a point where river discharge effects on water level outweigh tide/surge effects. As a channel is deepened, this cross-over point moves progressively upstream. Thus, channel deepening may alter flood risk spatially along an estuary and reduce the length of a river estuary, within which fluvial flooding is dominant.</p>https://os.copernicus.org/articles/18/1203/2022/os-18-1203-2022.pdf |
| spellingShingle | R. Familkhalili S. A. Talke D. A. Jay Compound flooding in convergent estuaries: insights from an analytical model Ocean Science |
| title | Compound flooding in convergent estuaries: insights from an analytical model |
| title_full | Compound flooding in convergent estuaries: insights from an analytical model |
| title_fullStr | Compound flooding in convergent estuaries: insights from an analytical model |
| title_full_unstemmed | Compound flooding in convergent estuaries: insights from an analytical model |
| title_short | Compound flooding in convergent estuaries: insights from an analytical model |
| title_sort | compound flooding in convergent estuaries insights from an analytical model |
| url | https://os.copernicus.org/articles/18/1203/2022/os-18-1203-2022.pdf |
| work_keys_str_mv | AT rfamilkhalili compoundfloodinginconvergentestuariesinsightsfromananalyticalmodel AT satalke compoundfloodinginconvergentestuariesinsightsfromananalyticalmodel AT dajay compoundfloodinginconvergentestuariesinsightsfromananalyticalmodel |