The book "Applied Hydrogeophysics" offers a comprehensive analysis of the application of hydrogeophysical methods to address challenges faced by professionals in the fields of environmental engineering, geophysics, agronomy, hydrology, soil science, and hydrogeology. It discusses the use of these methods to investigate hydrological processes and tackle environmental issues related to water flow as well as the transport of substances and pollutants. The structure of the book consists of process-oriented chapters written by leading experts. Topics covered include infiltration and substance transport processes, biogeochemical functions of soil-water systems, interactions between coastal groundwater and cold region hydrology, as well as engineering structures and landfill processes. Additionally, the development of new data fusion techniques relevant to many hydrogeophysical investigations is addressed, along with the application of the rapidly evolving self-potential technique to provide valuable information about water flows and hydrochemical conditions in the subsurface.