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Opracowanie scenariuszy erozji brzegu i jej skutków w okolicach Trzęsacza w latach 2005-2105 przy użyciu narzędzi geoinformacyjnych

Szakowski I., Benedyczak R.

Roczniki Geomatyki

2007

T. 5, z. 1

105-111

Evaluation of erosion threats was the main aim of the European Commission project called EUROSION. To fulfill this task many European programs and plans for coastal management were reviewed. Geographic Information Systems were present in all of them as one of the most important tools. Based on that experience some recommendations for designing a dedicated system were prepared. Another project MESSINA - .Managing European Shoreline and Sharing Information on Near-Shore Areas. was aimed at implementation of those recommendations and their verification. The Laboratory of Remote Sensing and Marine Cartography localized at the University of Szczecin was responsible for collecting data and implementing it into comprehensive GIS system for the Rewal community within the MESSINA Project. The main emphasis was placed on erosion problems and hazards of a long term near-shore investment connected with this issue. Many sets of data both graphic and attribute ones were collected for the pilot area of the Rewal community. The data reaching back even to year 1933 consisted of archival and present raster and vector maps, pictures, high resolution space images, coefficients of erosion rate and future investment plans up to 2015. All data was organized in one coordinate system with the use of ArcGIS software and presented in a way to enable display and analysis of plots and their development over any other available data. Calculation of shoreline changes was based on coefficients of erosion rate and prepared with the use of buffering tool leading to results of predicted changes that are supposed to occur in 20, 50 and 100 years. All analyses were conducted in two different scenarios. One assuming that the cliff where ruins of Trzęsacz church are standing will be protected and the second one assuming no human interference. To automate this time-consuming analyzis a Model Builder module was used. Both scenarios representing different changes of the coastline included two different forecasts. Depending on the erosion rate we can call them optimistic and the second one is a pessimistic forecast. Beside the value of erosion range and information about parcels spatial distribution both scenarios include estimated losses for each plot. Also parts that are not under any threats within the period of 20, 50 or 100 years are available for display. All results can by compared with the investment plans and for better perception they may be strengthened with the remote sensing data displayed below the basic information. This effective tool created within the MESSINA Project to predict shoreline behavior can be used in the decision making process by the community council. Additionally, the created system was used to explain complicated shoreline issues and its results in social consultations.