Paul has conducted geomorphology research in fluvial, coastal and estuarine systems for over 25 years. His research has included sediment transport, channel evolution, hydrodynamics, field measurement techniques, urban impacts on rivers, and the evolution of restored rivers. Some of his projects include sediment transport studies, geomorphic assessments, stream and shoreline restoration, erosion assessments for both stormwater management and dewatering projects, hazard assessments, and site remediation.