Portal de Periódicos da CAPES

A Simple Method of Measuring Beach Profiles

2006; Coastal Education and Research Foundation; Volume: 224; Linguagem: Inglês

10.2112/04-0387.1

1551-5036

Francisco Andrade, Maria Adelaide Ferreira,

Ocean Waves and Remote Sensing

Beach profiles provide useful information for coastal monitoring studies and management processes. In 1961, Emery proposed a simple method of beach profiling based on the use of two graduated rods, whose alignment and reading of the intersection with the horizon allow for the determination of differences in level along the profile. In spite of some shortcomings, and because of its simplicity and low cost, researchers and volunteers alike use the "Emery method" in monitoring studies of sand dunes and beaches, mainly in the USA. Modern techniques in current usage are expensive and require specialized technicians. An alternative method is presented, based on the physical principle of communicating vessels, that consists of the sequential measurement of differential elevation as read on two graduated rods connected by a hose filled with water. In terms of accuracy, this method compares favorably with standard topographic instruments, having significantly lower costs, higher portability, and greater ease of use and constitutes a valid alternative to the Emery method. It is faster, because the distance between the rods is adjustable to the shape of the beach and to the amount of detail required; does not need a visible horizon, allowing its use in lakes and in situations of limited visibility caused by beach relief or weather conditions; and requires no correction for the Earth's curvature. The method's simplicity makes it appropriate for use by volunteers in the collection of relevant data for the study and management of coastal zones, contributing to the environmental and scientific education of the participants.