Shoreline development is a measure of the complexity of the lake shoreline. It is simply the ratio of the shoreline length (i.e. perimeter) to the perimeter of an equally sized circle.
An object of
Returns a numeric value for the shoreline development of the lake
Florida LAKEWATCH (2001). A Beginner's guide to water management - Lake Morphometry (2nd ed.). Gainesville: Florida LAKEWATCH, Department of Fisheries and Aquatic Sciences. Link