The design conditions, such as the design wave height and the damage number, are described in a limit state. A limit state is defined by standard NEN-EN 1990:2002 (2002), as the state beyond which the structure no longer fulfils the relevant design criteria. Two of the most common limit states are:
- The Ultimate Limit State (ULS), which is the state associated with collapse of the breakwater or with other similar forms of failure
- The Serviceability Limit State (SLS), which is the state that corresponds to the conditions beyond which specified service requirements for the breakwater or part of the breakwater are no longer met.
breakwater.conditions.LimitState
Design criteria for coastal structures require, among other parameters, a certain type of characteristic wave height, for instance the significant wave height. In deep water the behaviour of the waves can be determined with the characteristic of the Rayleigh distribution. However, in shallow water the waves are no longer Rayleigh distributed, but a designer still wants to determine the significant wave height.
Two methods have been implemented to determine the nearshore wave characteristics. The first is Battjes and Groenendijk, which determines the wave characteristics from the output of a wave energy model (Battjes and Groenendijk, 2000). Secondly, the formulation by Goda (2000) which is based on experimental data.
breakwater.core.battjes.BattjesGroenendijk
breakwater.core.goda.goda_wave_heights
breakwater.utils.wave.shoaling_coefficient