Akademik Veri Yönetim Sistemi
İMO 10. Kıyı Mühendisliği Sempozyumu, İzmir, Türkiye, 16 - 17 Kasım 2023, ss.251-258
As a result of climate change, sea level rise is anticipated. Consequently,
coastal flooding will happen more frequently and with greater intensity, making
coastal cities more vulnerable. A major portion of the residential area is offered
by the Izmir Bay. For those who live close to structures in these environments,
coastal flooding brought on by rising sea levels can present serious issues. The
municipality of coastal cities like İzmir should take higher risk levels into
consideration. Hard measures and soft measures are the two main types of
measures. Since no artificial structures are used, utilizing soft solutions to
prevent coastal flooding is an environmentally friendly strategy.
To reduce incidence wave energy, the natural shoreline will quickly adapt to
new sea-level conditions. The flood level behind the shoreline should be
measured in the latest circumstance to see if it is above or below the threshold
values. Beach nourishment can be seen of as a risk-reduction measure in any
situation. Beach nourishment is seen as a soft solution that restores the
beach and creates a safe area that absorbs the force of incoming waves and
sea level rise situations. Izmir Bay has a lot of natural shorelines. Based on
the distinctive features of the chosen coastal zones, soft solutions will be
developed.
Numerical models will be used to explore how the bottom changes under the
increased hydrodynamic conditions imposed on by sea level rise. At Delft University, XBeach was created as a useful and potent tool for simulating
morphological changes in harsh environments. It can simulate both non dispersive and dispersive wave situations. From selected site requirements,
hydrodynamic condition, seabed sediment properties, and model bathymetry
were determined.
The XBeach model's calibration is based on the outcomes of physical model
testing carried out at METU's wave flume (Işık, 2019). The wave flume has the
following measurements: 29.0 meters long, 6.0 meters wide, and 1.0 meters
deep. Under various wave conditions, the physical model replicates changes
to the seabed and shoreline. The beginning condition for the tests is an
artificial, uniform coastline made with uniform sand. To determine the newly
created bottom shape, bathymetry is measured after each test. Physical test
results demonstrated that a rise in wave steepness and height has a major
impact on beach erosion. The XBeach model findings are then verified using
various physical test setups that are not considered during calibration
processes. Finally, the calibrated model will run for the conditions of the
natural coastline of İzmir Bay under the changing sea level and extreme wave
conditions to evaluate the soft solution option as a measure against coastal
flooding.