GIS TECHNOLOGY FOR COASTAL MANAGEMENT: HISTORICAL EVOLUTION OF THE SOUTHERN MARCHE COASTLINE AND MONITORING OF SAN BENEDETTO DEL TRONTO BEACH (AP) A. Acciarri, G. Di Pancrazio, G. Pasquini UNIVERSITY OF CAMERINO School of Science and Technology Geology Division
Study area Conero Mount PESARO NE ANCONA E SE -The whole Marche coastline has a length of ca. 172 km: 28 km of cliff coast and 144 km of beaches SAN BENEDETTO D.T. - The study area has a length of ca. 74 km - Orientation NNO-SSE Tronto River - Normally the littoral sediment drift goes from S to N
RASTER DATA Catasto Gregoriano IGM Topografic Maps Ortofotocarta Regionale Aerial Photos RAF flight GRID VECTORIAL DATA CTR Shorelines Defense works Sampling sites Information layers Bathymetric Maps DEM RELATED TABLES Sedimentological analysis Beach profiles METADATA Accessorial data of instruments Cronology of events Data informations
Steps of study 1) Finding of previous maps Maps Years Catasto Gregoriano 1835 e 1874 Carta Topografica d Italia IGM 1892/94 e 1948/53 Foto aeree Volo Raf 1943/45 Ortofotocarta regionale 1978 1984-1989 Carta tecnica Regionale 2000 Foto aeree 2000 e 2006 2) Co-georeferencing and analysis of maps with the software ESRI ArcGis 9.3 3) Data processing, based on techniques of spatial analysis as DSAS (Digital Shoreline Analisys System 3.2), allowed to evaluate changes in shoreline position for each time interval
Digital Shoreline Analisys System - DSAS - The Digital Shoreline Analysis System (DSAS) is a GIS-based software computing rate-ofchange statistics from multiple historic shoreline positions. It is also useful for computing rates of change for any other fluctuation problem involving clearly identified feature positions at discrete times. DSAS generates transects casted perpendicular to the baseline with a user-specified spacing alongshore. Transect/shoreline intersections along this baseline are then used to calculate rate-of-change statistics.
19 th century 1835 1892-94 1892-94 1835 1835 1892-94 1874
20th century 189294 189294 1988 194853 1988 1948-53 1892-94 1988 194853
1835 1845 1855 1865 1875 1885 1895 1905 1915 1925 1935 1945 1955 1965 1975 1985 1995 2005 111.150 99.916 103.788 99.948 With of river mouths (m) 113.781 143.078 132.325 135.818 154.715 147.128 Wooded areas (ha) 256.170 Wooded areas variations 900 800 700 600 250.000 230.000 210.000 500 190.000 400 170.000 300 200 100 130.692 131.066 136.651 150.000 130.000 110.000 0 90.000 Years
62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DECREASE Shoreline variations (m) INCREASE Porto Recanati Beach (MC) Musone R. 80 70 60 Physiographic Unit 2 Musone R. mouth - Potenza R. mouth 1894-1945 Groyns1930 Potenza R. 50 40 30 20 10 0-10 -20-30 -40-50 -60-70 -80 Scossicci Beach Porto Recanati Beach Transect numbers
62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DECREASE Shoreline variations (m) INCREASE Porto Recanati Beach (MC) Physiographic Unit 2 Musone R. mouth - Potenza R. mouth F. Musone 80 70 60 50 40 30 20 10 0-10 -20-30 -40-50 -60-70 -80 1894-1945 1945-1953 Scossicci Beach GROYNS 1930 Porto Recanati Beach Potenza R. Transect numbers
62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DECREASE Shoreline variations (m) INCREASE Porto Recanati Beach (MC) Physiographic Unit 2 Musone R. mouth - Potenza R. mouth F. Musone 80 70 60 50 40 30 20 10 0-10 -20-30 -40-50 -60-70 -80 1894-1945 1945-1953 Scossicci Beach Potenza R. BREAKWATERS 1960 GROYNS 1930 Porto Recanati Beach Transect numbers
62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DECREASE Shoreline variations(m) INCREASE Porto Recanati Beach (MC) Physiographic Unit 2 Musone R. mouth - Potenza R. mouth F. Musone 80 70 60 50 40 30 20 10 0-10 -20-30 -40-50 -60-70 -80 1894-1945 1945-1953 1953-1978 Scossicci Beach Potenza R. BREAKWATERS 1960 GROYNS 1930 Porto Recanati Beach Transect numbers
Porto Recanati Beach (MC) VIEW TO NORTH The development of the most of the beaches in the Marche Region matches with this evolutionary trend: in fact, over 67% (116 km out of 172 km) of the regional coastline is presently protected by some kind of defense works VIEW TO SOUTH
Monitoring of San Benedetto del Tronto beach (AP)
Study area 1 2 1 2
Issues related to erosion December 2008 January 2012
Monitoring of S. Benedetto del Tronto coastline: Geographical information system for data management ESRI ArcGIS 9.3 upgradability integration multidisciplinary creation of thematic maps previous data vectorial and raster data Multitemporality & Storage
Monitoring of S.Benedetto del Tronto coastline 1) Sedimentological analysis FINE SAND 2) GPS survey of the coastline 3) Bathymetric survey
GPS survey of the coastline
GPS survey of the coastline
Bathymetric survey
Possible causes of erosion
Possible causes of erosion
Conclusions A complete and homogeneous database has been realized. It allows to obtain a multidisciplinary, multitemporal and multiscale analysis. The historical evolution analysis of the coastline is the first step to set up a beach monitoring, aimed to individuate the possible erosion processes and planning future events.
THANK YOU FOR ATTENTION Working group: Prof. Carlo Bisci Prof. Gino Cantalamessa Ing. Giorgio Di Pancrazio