Integrated Surface—Subsurface Hydrological Models (ISSHMs) are based on mechanistic formulations of physical, biological, and geochemical processes in terrestrial systems and have received growing attention in recent years. By providing a holistic view of the integrated water, energy, and matter cycles in the terrestrial hydrological cycle, ISSHMs represent a unified and physically consistent framework for testing and validating advanced scientific hypotheses. Moreover, owing to the recent boost in computational capacities, ISSHMs are also gaining recognition as advanced hydrological decision-support tools, as they can now be used for evaluating the impacts of new water management strategies and natural hazard mitigation policies in the face of climate and land use changes.

This Research Topic aims to collect research contributions on recent developments and applications of ISSHMs, from local to catchment and continental scales. Besides innovative integrated simulations that consider natural interactions between the different compartments of the terrestrial hydrological cycle, we also seek studies that tackle human-water systems, such as drinking water supply, managed aquifer recharge, agricultural water use, or flood protection measures, with ISSHMs. Ultimately, our goal is to showcase how powerful and practical ISSHMs have become today and a new path forward for advancement and applications.

We invite submissions of original research, review, mini review, perspective, and opinion papers pertaining to all aspects of integrated surface-subsurface hydrological modeling, including, but not limited to:

- Coupling methods for natural and anthropogenic processes across different compartments of the terrestrial hydrological cycle, as well as between water, energy, carbon, and nutrient cycles;

- Novel insights into the interactions and feedback between groundwater, surface water, vegetation and/or atmospheric processes, as well as society;

- Incorporation of novel ecological, biological, and geochemical processes;

- Coupled surface-subsurface heat, mass, and sediment transport;

- New benchmarks for process representation in ISSHMs;

- Data assimilation in ISSHMs.

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Frontiers in Water

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