Long waves generation and coastal amplification due to atmospheric pressure disturbances

Metin, Ayşe Duha
The cause of the occurrence of ebb or abnormal waves which are occasionally observed on the coasts is related to the spatial and temporal changes of atmospheric pressure. Because, low atmospheric pressure leads to static water level rise in a part of the marine area and high atmospheric pressure leads to static water level drop in another zone, water level throughout the entire marine area is deformed. This deformation moves as wave, sometimes amplifies on the shore. Due to the changes of atmospheric pressure, the respective small amplitude long waves propagate along the entire marine area. This type of waves can propagate through long distances and can also be amplified due to resonant effects in the enclosed basins and nearshore/offshore coastal morphology. The investigation of the amplification of the long-period waves which occurred by the spatial and temporal changes of atmospheric pressure is the one of the objectives of this study. For the different types of regular shaped basins, tests are conducted by numerical modeling solving nonlinear shallow water equations. In the tests, basins with flat, triangular, shelf, upward and downward sloping sections are simulated by using high pressure zone propagating with certain velocity (faster, equal or slower than wave velocity). The change in the sea level is calculated and compared with the theoretical outcomes. Finally, the time histories of water surface fluctuations at selected numerical gauge points are computed in each simulation and compared to identify the effects of different bottom topographies on the amplification of long waves. 


Long waves generation by atmospheric pressure disturbances and case study
Çabuk, Özge; Yalçıner, Ahmet Cevdet; Department of Civil Engineering (2019)
One of the interesting marine events is the long wave generation due to spatial and temporal changes of atmospheric pressure and wind fields during storm events. These kind of phenomena is called as storm surge and cause basin wide and local water level changes in sea surface and sometimes amplifies at some regions. There are examples of these kinds of event in all over the world. In this study the atmospheric pressure and wind fields are used as the input to the numerical model NAMI DANCE which solves Nonl...
Long wave generation and coastal amplification due to propagating atmospheric pressure disturbances
Dogan, Gozde Guney; Pelinovsky, Efim; Zaytsev, Andrey; Metin, Ayse Duha; Özyurt Tarakcıoğlu, Gülizar; Yalçıner, Ahmet Cevdet; Yalçıner, Bora; Didenkulova, Ira (2021-02-01)
Meteotsunamis are long waves generated by displacement of a water body due to atmospheric pressure disturbances that have similar spatial and temporal characteristics to landslide tsunamis. NAMI DANCE that solves the nonlinear shallow water equations is a widely used numerical model to simulate tsunami waves generated by seismic origin. Several validation studies showed that it is highly capable of representing the generation, propagation and nearshore amplification processes of tsunami waves, including inu...
Ocean acidification research in the Mediterranean Sea: Status, trends and next steps
Hassoun, Abed El Rahman; Bantelman, Ashley; Canu, Donata; Comeau, Steeve; Galdies, Charles; Gattuso, Jean-Pierre; Giani, Michele; Grelaud, Michael; Hendriks, Iris Eline; IBELLO, VALERİA; Idrissi, Mohammed; Krasakopoulou, Evangelia; Shaltout, Nayrah; Solidoro, Cosimo; Swarzenski, Peter W. W.; Ziveri, Patrizia (2022-09-01)
Ocean acidification (OA) is a serious consequence of climate change with complex organism-to-ecosystem effects that have been observed through field observations but are mainly derived from experimental studies. Although OA trends and the resulting biological impacts are likely exacerbated in the semi-enclosed and highly populated Mediterranean Sea, some fundamental knowledge gaps still exist. These gaps are at tributed to both the uneven capacity for OA research that exists between Mediterranean countries,...
Nonlinear viscous higher harmonics generation due to incident and reflecting internal wave beam collision
Aksu, Anil A. (2017-09-01)
In this paper, we have considered the non-linear effects arising due to the collision of incident and reflected internal wave beams. It has already been shown analytically [Tabaei et al., "Nonlinear effects in reflecting and colliding internal wave beams," J. Fluid Mech. 526, 217-243 (2005)] and numerically [Rodenborn et al., "Harmonic generation by reflecting internal waves," Phys. Fluids 23, 026601 (2011)] that the internal wave beam collision generates the higher harmonics and mean flow in a linear strat...
Tsunami induced wave and current amplification and sedimentation in closed basins
Kian, Rozita; Yalçıner, Ahmet Cevdet; Department of Civil Engineering (2015)
Wave and current amplification inside the basins are related to different parameters. Wave period is one of the important parameters which governs the amplification inside the basins. If the period of incident wave coincides with one of the periods of free oscillations in the basin then resonant oscillation and amplification happens. Resonance inside harbors due to tsunami waves can exacerbate the damages by amplifying the water level changes, and currents. This phenomenon is important and cause unexpected ...
Citation Formats
A. D. Metin, “Long waves generation and coastal amplification due to atmospheric pressure disturbances,” M.S. - Master of Science, Middle East Technical University, 2016.