The important part of the tsunami research is focused on studying the considerable influence of natural geographical objects, like islands and near-coastal bathymetry, on tsunami waves. Complementing the physical modeling, we are designing a system for computer simulations of crucial coastal areas. The Bathymetry and Tsunami Source Data Editor is a basic system tool for editing bathymetric and tsunami source data by including/removing artificial seawalls and submerged barriers having different shapes and sizes. Results of numerical experiments are presented for the gridded hybrid bathymetry for several coastal areas of Japan. This system can help to issue recommendations for better protection of some crucial objects on a coastline.
The big part of the tsunami science is focused on studying the considerable influence of natural geographical objects, like islands and near-coastal bathymetry, on the tsunami waves. While the complete damage assessment for the Great Tohoku Earthquake event is still underway, the immense impact of this tsunami raises questions about mitigating the impact for such an event at different time scales, from real-time tsunami warning guidance to long-term hazard assessment. The necessity to embed modeling tools is shown for Earthquake and Tsunami Warning System for Natural Disaster Prevention and Defense Systems (Marchuk et. al., 2012), (Pararas-Carayannis, 2015), (Terrier et. al., 2013), (Venturato et. al., 2007). One such example known as "Matsushima effect" showed big influence of placement and sizes of natural geographical objects like islands and bathymetry on the tsunami wave parameters such as wave height and flow velocity (Martin et. al., 2011).
Currently, such investigations are mostly implementing by physical modeling in basins (several meters in length and less than one meter in depth) (Fridman et. al., 2010), (Fukuyama et. al., 2015). It was also shown that parameters of simulations could be transformed to natural conditions. Experiments described in (Fridman et. al., 2010) showed good results for impacting submarine barriers on tsunami wave propagation but actually very expensive. In addition to the physical modeling, we are designing a system allowing numerical computer simulations for crucial coastal areas supporting so-called hybrid bathymetry combining natural and artificial underwater objects as well as tools allowing the user manipulate with them (Hayashi et. al., 2014), (Marchuk et. al., 2015) in order to make it more intensive. Our research is based on the original programming approach named Virtual Model- View-Controller (VMVC) that is an adaptation of the traditional MVC to requirements of Service-Oriented Architectures (SOA). Accordingly, the aim of modeling process is in finding preliminary suitable number, sizes, and placement of submarine bathymetry objects in order to minimize the dangerous tsunami wave parameters (height and flow velocity). Accordingly, it may be possible to design and build a set of digital artificial objects (islands) that can be used to protect the coastal areas. In particular, such protection could be maximized in highly populated areas, as well as in industrial areas.