Long-term morphological change in the Ribble Estuary, northwest England. Mar. Geol. 2002, 189, 249–266. [CrossRef] 47. Van der Wal, D.; Pye, K. The use of historical bathymetric charts in a GIS to assess morphological change in estuaries. Geogr. J. 2003, 169, 21–31. [CrossRef]...