MORPHOLOGICAL VULNERABILITY INDEX: A SIMPLE WAY TO DETERMINING BEACH BEHAVIOUR

Oscar Ferreira, Rui Taborda, J. Alveirinho Dias

Abstract


A simple morphological based index to determine beach vulnerability is proposed in this paper. The presented morphological vulnerability index (Iy) relates maximum annual volumetric difference and average beach volume for each particular site. High index values are representative of coastlines vulnerable to After the index application to 15 Portuguese sites it was possible to determine empirical threshold values, defining limits between beach stages. Based on these limits the beaches can be classified as: robust beaches, for Iv < 0.35; fragile beaches, for 0.35 < Iy <0.9; and extremely fragile beaches, for Iv > 0.9. The index validation tests against field observations and recent shoreline evolution gave good results, indicating that the Iv has a strong potential application to characterise medium to long-term beach evolution.

Keywords


morphological vulnerability index; beach behavior

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