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Sediment grain size and hydrodynamics in Mediterranean coastal lagoons: Integrated classification of abiotic parameters |
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| Authors: | Emanuela Molinaroli Alessandro Sarretta Christian Ferrarin Emanuele Masiero Antonietta Specchiulli Stefano Guerzoni |
| Institution: | 1. Dipartimento di Scienze Ambientali Informatica e Statistica, Università Ca’ Foscari Venezia, Dorsoduro 2137, 30123, Venezia, Italy 2. CNR–Consiglio Nazionale delle Ricerche, ISMAR – Istituto di Scienze Marine in Bologna, via Gobetti 101, 40129, Bologna, Italy 3. CNR–Consiglio Nazionale delle Ricerche, ISMAR – Istituto di Scienze Marine in Venezia, Castello 2737/F, 30122, Venezia, Italy 4. CNR–Consiglio Nazionale delle Ricerche, IAMC – Istituto per l’Ambiente Marino Costiero in Oristano, 090782, Torregrande, Oristano, Italy 5. Urban Planning, Via S. Martino, 11-35030, Veggiano, Padova, Italy 6. CNR–Consiglio Nazionale delle Ricerche, ISMAR Istituto di Scienze Marine in Lesina, via Pola 4, 71010, Lesina (FG), Italy |
| Abstract: | Integrated classification maps were produced by combining sediment grain-size and hydrological data (water renewal time, WRT) from two Mediterranean lagoons, Lesina (LL) and Varano (LV), Italy. The geophysical characteristics of the two basins, derived from detailed bathymetric charts, are quite distinct: ～30% of LL (mean depth ～1 m) but only 3% of LV (mean depth ～3 m) is shallower than 1 m. The sediments of both lagoons are mainly composed of mud (～80%). A detailed multivariate analysis of grain-size data by EntropyMax classified the lagoon beds of LL and LV into five sedimentary facies. WRT data, computed by a hydrodynamic model, indicated different hydrological conditions in the two lagoons: LL showed a sharp west–east gradient, with a basin-wide average of ～190 days, whilst LV showed a fairly uniform distribution and a higher basin-wide average (～260 days). The distribution of sedimentary facies and water renewal times were combined in a composite map representing the distribution of environmental patterns. The approach outlined in this study can be used to improve zonation schemes by providing a hydromorphological perspective on transitional and coastal environments. |
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