GIS-‐based coastal sensi1vity map for Tanzania Christopher A. Muhando, Ins&tute of Marine Sciences – [email protected] Yves Barthélemy, OBSCOM Paris and MaBhew D. Richmond, Samaki Consultants Ltd. Dar es Salaam Supported by Oil and Gas Companies Statoil Tanzania BG Tanzania Petrobras 1 Outline • Introduc&on – Ra&onale & Objec&ve • Methodology • Results and lessons • Recommenda&ons 2 Tanzania Coastal resources and ac1vi1es • Coastal zone is important – Communi&es dependence is high • • • • Important habitats Fisheries resources Transporta&on Oil and gas • Threatened – by natural disasters and – Anthropogenic ac&vi&es leading to pollu&on and degrada&on 3 Lack or little information to guide decisions • • • Habitat distribu&on and status Fisheries resources distribu&on and status Other human ac&vi&es • What would be the impacts of oil spill accident or any coastal disasters – Which areas deserve high aDen1on – The mapping of the sensi&vity of the environment to accidental oil pollu&on is an essen&al step in oil pollu&on preparedness, response and coopera&on efforts, and maps are a crucial tool to assist responders during an incident. – Tz Government insisted that oil and gas explora1ons must have a con1ngency plans • A GIS-‐based coastal sensi1vity map for Tanzania was requested – Environmental sensi&vity analysis process ends up with a sensi&vity index (ESI) map 4 Environmental Sensi&vity Index (ESI) • ESI maps – provide a concise summary of coastal features, resources and ac&vi&es that are at risk if an oil spill occurs nearby. • sensi&ve shorelines • biological resources and • human-‐use resources • When an oil spill occurs, ESI maps can help in reducing the environmental consequences of the spill – iden&fy vulnerable loca&ons, – establish protec&on priori&es, and – iden&fy cleanup strategies. 5 GIS based Environmental Sensi&vity mapping benefits include: • Easy to update, • Clear graphical displays • GIS layers can be supplied with fully compa&ble viewing soaware • Support in the prepara&on of integrated spill con&ngency plans 6 Aproaches 1. To map shoreline features (or characteris&cs) 2. To map areas with important biological resources 3. To map socio-‐economic ac&vi&es 4. To evaluate combined ESI (1+2+3) 7 Methodology • Geo-‐referencing features – ranked based on their sensi&vity to oiling. • Consulted responders and coastal zone managers. • Made use of available sources 8 9 10 11 12 13 Biological features (lea) converted to Sensi&vity grids (right) 14 Biological sensi&vity (lea) and Human Resource use (right) 15 Reclassified table showing ESI input values and the final ESI values Input rela1ve sensi1vity value Output values 0 1 (Green) 1 1 (Green) 2 2 (Yellow) 3 2 (Yellow) 4 2 (Yellow) 5 3 (Orange) 6 3 (Orange) 7 3 (Orange) 8 4 (Red) 9 4 (Red) 10 4 (Red) 16 Environmental Sensi&vity Index (ESI) 17 18 19 Concluding Remarks – 1 • Data sets generally old, collec1on methods old and not really objec1ve – improvements required • Data set not backed up by strong thema1c surveys or reports –backup report are required • Generally characterized by low resolu1on (low accuracy). Not very useful at opera1onal (large scale) situa1ons – Opera1onal resolu1on required • Low representa1veness and low sampling intensity (generally low quality) but considered beDer than nothing -‐ improvements required • Datasets could be improved (updated geometrically and aDribute levels) -‐ improvements required Concluding Remarks -‐ 2 • GIS literacy (awareness) among managers and decision makers is the first main problem. Data needs, methods, analysis oWen not guided by decision makers. -‐ Educa1on and awareness required • Responsible na1onal GIS ins1tu1ons seem to be lagging behind research and projects or less interest in coastal and marine data. • There is adequate Na1onal spa1al data infrastructure as such. – developing it is encouraged. • Data gathering protocols and formats are not standardized to help the Na1onal ins1tu1ons to harvest sectoral data sets easily. -‐ improvements required • Tanzania Government is now working towards rec1fying all men1oned weaknesses. 21 TanSeA Maps (pdf) are available online • Downloadable at www.tansea.org and www.ims.udsm.ac.tz • Shape files and other datasets are freely available to government agencies and for educa&on purposes THANK YOU
© Copyright 2024