Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 103521 |
| Fachzeitschrift | Coastal engineering |
| Jahrgang | 152 |
| Frühes Online-Datum | 1 Juli 2019 |
| Publikationsstatus | Veröffentlicht - Okt. 2019 |
Abstract
Migration of nearshore sandbars results from nonlinear interacting hydro- and morphodynamic processes in the surf zone of wave dominated sandy shorelines. To gain new insights in the largely varying temporal effects of shoreface nourishments within these areas, the principle component analysis is applied to sixteen data sets with i) natural sandbar migration on different timescales and ii) interfering shoreface nourishments. The statistical methodology is able to separate the non-stationary effects of shoreface nourishments from the natural stationary migration of the sandbars. Depending on other long-term morphodynamic changes and nourishment interactions in the data, the duration of these interferences (the nourishment lifetimes) can be quantified. Relating these nourishment lifetimes (L n) with respect to the bar cycle return periods (T r) of these areas (e.g. the relative nourishment lifetime) of twenty-one shoreface nourishments with several design parameters, and parameters of the sandbar system in which they were placed, remained inconclusive. A negative exponential fit with the bar cycle return period itself was the most significant (r 2 = 0.41). Assuming a linear system of the parameters increases the predictive capability (r 2 = 0.67). The most influential parameters in this relation are the nourishment concentration (+), the nourishment depth (+), the concentration of the migrating sandbars (−) and the bar cycle return period (−), thereby indicating the prominent roles of both nourishment design and natural sandbar system in the inter-site variability of shoreface nourishment lifetimes.
Schlagwörter
- Nearshore sandbar migration, Nourishment lifetime, Principal component analysis, Relative nourishment lifetime, Shoreface nourishments, Coastal engineering, Linear systems, Nearshores, Non-stationary effects, Predictive capabilities, Principle component analysis, Shoreface nourishment, Statistical methodologies, beach nourishment, morphodynamics, nearshore dynamics, principal component analysis, sandbar, sea level change, shoreline change, surf zone
ASJC Scopus Sachgebiete
- Ingenieurwesen (insg.)
- Meerestechnik
- Umweltwissenschaften (insg.)
- Environmental engineering
Zitieren
- Standard
- Harvard
- Apa
- Vancouver
- BibTex
- RIS
in: Coastal engineering, Jahrgang 152, 103521, 10.2019.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - The lifetime of shoreface nourishments in fields with nearshore sandbar migration
AU - Gijsman, Rik
AU - Visscher, Jan Hendrik
AU - Schlurmann, Torsten
N1 - Funding Information: This study was funded by the German Federal Ministry of Education and Research (BMBF) through the project STENCIL (contract number 03F0761 ). The authors gratefully acknowledge Rijkswaterstaat for providing the data sets.
PY - 2019/10
Y1 - 2019/10
N2 - Migration of nearshore sandbars results from nonlinear interacting hydro- and morphodynamic processes in the surf zone of wave dominated sandy shorelines. To gain new insights in the largely varying temporal effects of shoreface nourishments within these areas, the principle component analysis is applied to sixteen data sets with i) natural sandbar migration on different timescales and ii) interfering shoreface nourishments. The statistical methodology is able to separate the non-stationary effects of shoreface nourishments from the natural stationary migration of the sandbars. Depending on other long-term morphodynamic changes and nourishment interactions in the data, the duration of these interferences (the nourishment lifetimes) can be quantified. Relating these nourishment lifetimes (L n) with respect to the bar cycle return periods (T r) of these areas (e.g. the relative nourishment lifetime) of twenty-one shoreface nourishments with several design parameters, and parameters of the sandbar system in which they were placed, remained inconclusive. A negative exponential fit with the bar cycle return period itself was the most significant (r 2 = 0.41). Assuming a linear system of the parameters increases the predictive capability (r 2 = 0.67). The most influential parameters in this relation are the nourishment concentration (+), the nourishment depth (+), the concentration of the migrating sandbars (−) and the bar cycle return period (−), thereby indicating the prominent roles of both nourishment design and natural sandbar system in the inter-site variability of shoreface nourishment lifetimes.
AB - Migration of nearshore sandbars results from nonlinear interacting hydro- and morphodynamic processes in the surf zone of wave dominated sandy shorelines. To gain new insights in the largely varying temporal effects of shoreface nourishments within these areas, the principle component analysis is applied to sixteen data sets with i) natural sandbar migration on different timescales and ii) interfering shoreface nourishments. The statistical methodology is able to separate the non-stationary effects of shoreface nourishments from the natural stationary migration of the sandbars. Depending on other long-term morphodynamic changes and nourishment interactions in the data, the duration of these interferences (the nourishment lifetimes) can be quantified. Relating these nourishment lifetimes (L n) with respect to the bar cycle return periods (T r) of these areas (e.g. the relative nourishment lifetime) of twenty-one shoreface nourishments with several design parameters, and parameters of the sandbar system in which they were placed, remained inconclusive. A negative exponential fit with the bar cycle return period itself was the most significant (r 2 = 0.41). Assuming a linear system of the parameters increases the predictive capability (r 2 = 0.67). The most influential parameters in this relation are the nourishment concentration (+), the nourishment depth (+), the concentration of the migrating sandbars (−) and the bar cycle return period (−), thereby indicating the prominent roles of both nourishment design and natural sandbar system in the inter-site variability of shoreface nourishment lifetimes.
KW - Nearshore sandbar migration
KW - Nourishment lifetime
KW - Principal component analysis
KW - Relative nourishment lifetime
KW - Shoreface nourishments
KW - Coastal engineering
KW - Linear systems
KW - Nearshores
KW - Non-stationary effects
KW - Predictive capabilities
KW - Principle component analysis
KW - Shoreface nourishment
KW - Statistical methodologies
KW - beach nourishment
KW - morphodynamics
KW - nearshore dynamics
KW - principal component analysis
KW - sandbar
KW - sea level change
KW - shoreline change
KW - surf zone
KW - Nearshore sandbar migration
KW - Nourishment lifetime
KW - Principal component analysis
KW - Relative nourishment lifetime
KW - Shoreface nourishments
UR - http://www.scopus.com/inward/record.url?scp=85069613575&partnerID=8YFLogxK
U2 - 10.1016/j.coastaleng.2019.103521
DO - 10.1016/j.coastaleng.2019.103521
M3 - Article
VL - 152
JO - Coastal engineering
JF - Coastal engineering
SN - 0378-3839
M1 - 103521
ER -