Dr. Haowen Xu is a research scientist in the Computational Sciences and Engineering Division at Oak Ridge National Laboratory. Dr. Haowen Xu received his Ph.D. in Civil and Environmental Engineering and a graduate certificate in Geoinformatics at the University of Iowa in 2019. Before that, he got his MS degree in Civil and Environmental Engineering from the University of Iowa in 2015. His research interests primarily include watershed management, sediment transport, erosion controls, hydro-informatics, developing web-based environmental Decision Support Systems (DSS), and visual analytics. After joining the ORNL, he is particularly interested in developing large-scale digital twins, visual analytics interfaces, cyberinfrastructure to support urban research and management from a holistic aspect.