Towards the development of a cloud-based BIM platform and VR apps for complex heritage sites subject to the risk of flood and water level changes

3D acquisition methods and systems for totally or partially submerged cultural heritage (CH) allow the developments of methods able to integrate complex BIM projects for rivers, lakes, maritime structures and infrastructures with the world of Virtual Reality (VR) and BIM monitoring. Thanks to an open approach this paper shows the results obtained in the field of programming language for the development of an open-source BIM platform able to get e fusion between the application fields of BIM sensor, monitoring, historic building information modelling (HBIM) and VR. Several preliminary test results are reported in order to show the potential of the proposed method for multiple research case studies, and also proposing future perspectives and developments oriented to get a holistic, inclusive and unified platform able to manage complex scenarios accurately such heritage sites subject to the risk of flood and water level changes.