MODELING OF STORM INDUCED ISLAND BREACHING AT THE BALTIC SEA COAST

摘要

A process-based morphodynamic coastal area model (TIMOR3) is applied to simulate the virtual breaching of Hiddensee Island at the southwestern coast of the Baltic Sea during a storm flood. Furthermore the medium-term (3 years) development of the initial breach and of an adjacent inlet is simulated using a new approach of model input filtering for a nontidal site. The input filtering of forcing- and boundary conditions is based on typical weather patterns and on wind statistics. The modeled island breach is similar to a historic breach measured in 1866. The adjacent inlet adapts its morphology to the new hydraulic situation due to the island breach mainly within one year. A comparison study with and without a breaching of Hiddensee Island reveals that sedimentation in the adjacent inlet is less in the case of breaching.