Ciaran Harman

co-PI, Associate Professor

BedrockBEDROCK

Johns Hopkins University

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I study the movement of water from rainfall through the landscape to streams and beyond, and how landscape structure evolves over time by the action of water. Mostly I try to connect theory and data in interesting ways that shed a little light on how the world works. Much of my work is concerned with finding new ways to mechanistically describe physical processes at landscape scales – new ways that capture the emergent effects of the landscape’s multiscale complexity, without requiring its minute details to be represented explicitly. This addresses a fundamental knowledge gap that inhibits reliable predictions of streamflow quantity and quality in headwater catchments. My students and I combine theory, experiments, modeling, fieldwork, and data analysis to study a range of topics from the effect of drought on streamflow, to sewage backups in Baltimore basements, to the evolution of planetary topography over millions of years.