EFDC+ implements a robust ice sub-model. Previously EFDC_DSI had relatively limited ice modeling ability such that the ice conditions had to be fully specified by the user for every cell for the model simulation period. The creation of the input files was also external to EE. With EFDC+, ice formation and melt is simulated using a coupled heat model and fully handled by EFDC_Explorer. Options include Heat Coupled Ice Model (ISICE = 3) and Heat Coupled Ice Model with Frazil Transport (ISICE = 4). Ice sub-model was added in 2015 for EE7.3.
(Note that ice dynamics are not modeled at this stage. An ice dynamics sub-model would simulate the constriction of the channel by ice and the resulting bed shear caused by the transport of ice chunks. An ice dynamics sub-model is being considered for a later release of the EE modeling system).