Abstract
Barrier response to sea-level rise involves a dynamic interplay between the shoreface and the subaerial portion affected by overwashing. Focusing on feedbacks between these two, here we discuss a morphodynamic approach to modeling barrier transgression. In contrast with the steady transgression portrayed by morphokinematic models (which transport mass based on geometric considerations), a simple morphodynamic model predicts two modes of long-term barrier failure: width and height drowning. For barriers that survive sea-level rise, a most likely mode of barrier motion consists of punctuated and abrupt periodic transgression of the shelf, which can arise even from constant driving conditions. These intermittently migrational barriers spend most of their existence staying essentially in place, a stark contrast to the continuous behavior suggested by morphokinematic models of barrier retreat. Even small perturbations to a barrier system traversing the shelf in dynamic equilibrium can kick-start an oscillating retreat. Looking alongshore, shoreline interconnectivity can have a significant effect on shoreline behavior across both space and time. Overall, our morphodynamic modeling results motivate a need to investigate the internal dynamics of barrier systems to understand the full range of past and potential future response of barrier systems to sea-level rise.
| Original language | English |
|---|---|
| Title of host publication | Barrier Dynamics and Response to Changing Climate |
| Publisher | Springer International Publishing |
| Pages | 277-304 |
| Number of pages | 28 |
| ISBN (Electronic) | 9783319680866 |
| ISBN (Print) | 9783319680842 |
| DOIs | |
| State | Published - 15 Feb 2018 |
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Keywords
- Alongshore connectivity
- Alongshore transport
- Barrier rollover
- Dynamic equilibrium
- Height drowning
- Moving boundary
- Overwash
- Periodic retreat
- Shoreface
- Width drowning
Cite this
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Morphodynamics of barrier response to sea-level rise. / Ashton, Andrew D.; Lorenzo Trueba, Jorge.
Barrier Dynamics and Response to Changing Climate. Springer International Publishing, 2018. p. 277-304.Research output: Chapter in Book/Report/Conference proceeding › Chapter
TY - CHAP
T1 - Morphodynamics of barrier response to sea-level rise
AU - Ashton, Andrew D.
AU - Lorenzo Trueba, Jorge
PY - 2018/2/15
Y1 - 2018/2/15
N2 - Barrier response to sea-level rise involves a dynamic interplay between the shoreface and the subaerial portion affected by overwashing. Focusing on feedbacks between these two, here we discuss a morphodynamic approach to modeling barrier transgression. In contrast with the steady transgression portrayed by morphokinematic models (which transport mass based on geometric considerations), a simple morphodynamic model predicts two modes of long-term barrier failure: width and height drowning. For barriers that survive sea-level rise, a most likely mode of barrier motion consists of punctuated and abrupt periodic transgression of the shelf, which can arise even from constant driving conditions. These intermittently migrational barriers spend most of their existence staying essentially in place, a stark contrast to the continuous behavior suggested by morphokinematic models of barrier retreat. Even small perturbations to a barrier system traversing the shelf in dynamic equilibrium can kick-start an oscillating retreat. Looking alongshore, shoreline interconnectivity can have a significant effect on shoreline behavior across both space and time. Overall, our morphodynamic modeling results motivate a need to investigate the internal dynamics of barrier systems to understand the full range of past and potential future response of barrier systems to sea-level rise.
AB - Barrier response to sea-level rise involves a dynamic interplay between the shoreface and the subaerial portion affected by overwashing. Focusing on feedbacks between these two, here we discuss a morphodynamic approach to modeling barrier transgression. In contrast with the steady transgression portrayed by morphokinematic models (which transport mass based on geometric considerations), a simple morphodynamic model predicts two modes of long-term barrier failure: width and height drowning. For barriers that survive sea-level rise, a most likely mode of barrier motion consists of punctuated and abrupt periodic transgression of the shelf, which can arise even from constant driving conditions. These intermittently migrational barriers spend most of their existence staying essentially in place, a stark contrast to the continuous behavior suggested by morphokinematic models of barrier retreat. Even small perturbations to a barrier system traversing the shelf in dynamic equilibrium can kick-start an oscillating retreat. Looking alongshore, shoreline interconnectivity can have a significant effect on shoreline behavior across both space and time. Overall, our morphodynamic modeling results motivate a need to investigate the internal dynamics of barrier systems to understand the full range of past and potential future response of barrier systems to sea-level rise.
KW - Alongshore connectivity
KW - Alongshore transport
KW - Barrier rollover
KW - Dynamic equilibrium
KW - Height drowning
KW - Moving boundary
KW - Overwash
KW - Periodic retreat
KW - Shoreface
KW - Width drowning
UR - http://www.scopus.com/inward/record.url?scp=85047071565&partnerID=8YFLogxK
U2 - 10.1007/978-3-319-68086-6_9
DO - 10.1007/978-3-319-68086-6_9
M3 - Chapter
AN - SCOPUS:85047071565
SN - 9783319680842
SP - 277
EP - 304
BT - Barrier Dynamics and Response to Changing Climate
PB - Springer International Publishing
ER -