Research at SER2L focuses on questions involving sediment sourcing, transport, mixing and accumulation, and related processes in rivers and their floodplains, marshes, deltas, lakes, estuaries, coastal and open ocean settings. In addition to methods in geochemistry, sedimentology, geomorphology, and spatial analysis, we utilize the unique temporal and chemical characteristics of fallout and lithogenic radionuclides (7Be, 137Cs, 210Pb, 239,240Pu, 234Th, 232Th, 230Th, 228Th) to examine a range of geological, biological, and chemical processes in these environments.