Simulation of Water Inundation Using Virtual Reality Tools for Disaster Study: Opportunity and Challenges Deepak Mishra Associate Professor Department of Avionics Indian Institute of Space Science and Technology Trivandrum Kerala [email protected]
Agenda • Introduction and motivations • What is Virtual Reality • What is Augmented Reality • Terrain mapping • Water flow model • advantages as well as potential drawbacks and challenges associated with VR
Introduction • Water plays a very important roles in human survival but its can also triumph every thing in it’s path as flood, tsunami. • Nowadays we are analyzing flood based on pre and post events, but recent development in technologies can help us to create a platform for visualizing and analyzing floods scenarios or to build a early warning system. • Effective training is a cornerstone of disaster preparedness efforts worldwide. • One such platform is virtual reality where User can create or load pre-defined scenarios into the scene and can control the environment parameters. Training in such environment will be an advantage.
Virtual Reality • Virtual reality is the term used to describe a three-dimensional, computer generated environment which can be explored and interacted with by a person. • That person becomes part of this virtual world or is immersed within this environment and whilst there, is able to manipulate objects or perform a series of actions. • Simply virtual reality replaces the real world with artificial
Augmented Reality • Augmented reality (AR) is a live direct or indirect view of a physical, real-world environment whose elements are augmented (or supplemented) by computergenerated sensory input such as sound, video, graphics or GPS data. • It is related to a more general concept called mediated reality, in which a view of reality is modified by a computer. • Simply Interaction of a computer generated scene with real world objects
Disaster Response training • disaster response training and exercises, preparedness efforts continue to primarily rely on three conventional training methods: • classroom-based instructive teaching; • web-based training that consists primarily of pre-recorded, user-paced presentation material; and • real-life drills and tabletop exercises of varying scales.
• The advent of technologically-based approaches to disaster preparedness through virtual reality (VR) environments appears promising in its ability to bridge the gaps of other commonly-held established training formats.
RATIONALE FOR VR-BASED TRAINING • During a disaster or public health emergency, the ability for responders to react appropriately is driven not only by pre-existing knowledge and skills, but also to a considerable degree, their psychological state of mind and familiarity with similar scenarios. • Particularly during high impact, low probability events, appropriate personnel response relies upon the ability to perform their designated roles.
ADVANTAGES OF VR-BASED TRAINING • Interactive VR-based disaster training can be tailored to specific users as well as organizations, based on their resources and hazard vulnerability analysis. • a VR-based exercise can also allow an organization to test its emergency response plans in order to assess its effectiveness, and in turn, identify gaps and areas for improvement. • VR-based applications can also facilitate consistent and repeated training over geographical and organizational divides. • Another significant advantage of VR-based systems is the ability to incorporate additional realistic audio-visual stimuli, such as video clips depicting a mock event in progress or news reports that convey further information from the disaster.
POTENTIAL DRAWBACKS • The lack of familiarity with VR applications among disaster planning leadership may be a significant barrier to adopt such technology. • The intuitive nature of VR-based training and its resemblance to commercial gaming platforms may lead some to perceive VR platforms as lacking credible and validated training benefit. • The initial development costs associated with a VR-based training and exercise applications is high. • Achieving the full immersion in the disaster scenario is difficult and its varies with person to person.
Some examples • New York City Office of Emergency Management (OEM): Advanced Disaster Management Simulator (ADMS). The system focuses on command element simulation and allows trainees to navigate through the virtual city by means of a joystick. Trainees can communicate emergency response needs through a facilitator who guides them through decision points and objectives. • Los Angeles Police Department (LAPD) • NRSC virtual reality lab for visualizing and fly throuugh
Terrain • Terrain is generated with the help of DEM(digital elevation modal) which is a 3D representation of terrain
Terrain generated with help of DEM
Water model • There are many methods to simulate water • Jerry model based on Bernoulli's equations, which is helpfull in creating source and ripples. • Pipe model( Kellomäki model) based grid system, which is help full in decreasing computational complexity and coupling with rigid body
• So we combined the above models where user can change the environmental conditions or interact with rigid body ,water and terrain
• Matlab simulation of water
A virtual dam created on terrain
inundation of water over terrain
Augmented reality overview • Augmented reality develops a composite view to the user which is a combination of the real scene visualized by the user and a virtual scene generated by computer • The tracking module calculates the correct location and orientation for virtual overlay
Flow chart of an AR system.
Augmented reality visualization mode of the platform
A cube augmented on the top marker
Conclusion • The emergence of virtual reality platform-based technologies applied to disaster preparedness and response training offers significant potential advantages over other traditional forms of training, and is gaining increasing acceptance. • In future virtual reality can play a major role in risk asset management. • one can make a better plan for withstand the flood severity in the scene and go for decision making. • VR is useful in planning of city and damage assessment • Comparative research between VR-based and traditional modalities of disaster training is needed to explore the various aspects of realism, cost, and ultimately disaster readiness.