Zhonglong Zhang, PHD, PH, PE, is a Senior Scientist with 25 years of experience, recently specializing in the research and development of innovative watershed and environmental models for the USACE. Dr. Zhang is the lead developer of aquatic nutrient (NSM) and contaminant (CSM) simulation modules constructed for the HEC-RAS and other hydrologic and hydraulic models. He is the co-developer of the riparian vegetation simulation module (RVSM) for riverine hydraulic models. He supported the development of multimedia transport/fate/risk assessment models in the Training Range Environmental Evaluation and Characterization System (TREECS) for forecasting the fate and transport of munitions constituents in training ranges. He added new water quality features and the benthic sediment diagenesis module into CE-QUAL-W2. He has applied these and additional tools in support of the USACE, DOE, and DOD environmental studies. Zhonglong works at one of LimnoTech’s other staff locations in Davis, California.