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ELBE Restoration project: Spadenlander Busch / Kreetsand

ELBE Restoration project: Spadenlander Busch / Kreetsand. Dr. Annedore Seifert, Hamburg Port Authority. Changing Estuary – dynamic nature. Elbe river mouth. 1976. 2002. within 30 years, loss of 100 million m³ of sediment  more tidal energy can enter the estuary. 1.

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ELBE Restoration project: Spadenlander Busch / Kreetsand

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  1. ELBERestoration project: Spadenlander Busch / Kreetsand Dr. Annedore Seifert, Hamburg Port Authority Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  2. Changing Estuary – dynamic nature Elbe river mouth 1976 2002 within 30 years, loss of 100 million m³ of sediment  more tidal energy can enter the estuary Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority 1

  3. Changing Estuary - uses Past Present Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  4. Changing Estuary: tidal range Elbe Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  5. Changing Estuary: tidal pumping Nachteilige Veränderung: Verlandung silting up of anabranches and embankments More sedimentation in port and fairways Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  6. Restoration of the Estuary: The Tidal Elbe Concept Three main Objectives for a Future Action Plan: • Attenuation of the Tidal Energy through River Engineering in the Mouth of the Estuary, • More Space for the River (Tidal Volume) in the upper Part • Optimisation of the Sediment- management considering the whole System of the Elbe Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  7. Spadenlander Busch / Kreetsand Project: Spadenlander Busch / Kreetsand Tidal Volume: New shallow water area Hamburg Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  8. Project: Spadenlander Busch / Kreetsand • former spoil area / dewatering field, partially dyke foreland with alluvial forest • dyke realigned in 1999 • planning area ~ 47 ha • mean surface level +5,50 m NN Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  9. Project: Spadenlander Busch / Kreetsand Tidal Volume: New shallow water area • Operational Objectives • increaseoftidalvolume • reductionoftidalrange (supporting MTLW) • reductionoftidalpumpingeffects (lessdredgingefforts) • Further Objectives • Project integrating all needsofuses (natureandwaterconservation, tidalriverdevelopment,recreationetc.) • Maintainingandimprovingthediversityofbiotopes • Enhancepublicexperience on interactionsoftidalactionsandnature • Usetheprojectfor a newcommunciationschemeoftheTidal Elbe Concept Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  10. Comparison, selection and technical planning of the final version Planning process / examinated criteria Design and evaluation of the preferential alternatives Earth works planning • Soil-mechanical and –chemical examination • Removal: concept of re-useand disposal • Geotechnical analysis Hydrodynamics • 2-D-modelling • evaluation of the flow conditions • evaluation of the sedimentation processes Nature conservation • Inventory and assessment of the status quo • Definition of required compensation • Strategic environmental assessment Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  11. Selectionofthepreferential versionsandmodelling Preselection of 8 different alternatives Selection of 3 preferential alternatives Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  12. Modelling ofthecurrents Alternative 1 Alternative 3 Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  13. Modelling ofsedimentationprocesses Alternative 1 Alternative 3 Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  14. Evaluation matrixandcriteria • Rating of the alternatives by using different evaluation criteria to the topics • Target achievement • Impact on nature conservation objectives • Time line • Costs • Scoring to give more weight to extra important criteria • Attenuation of the tidal range support of MTLW • Sustainability  restriction of sedimentation • Nature  alluvial forest, biotopes • Sensitivity analyses to verify the results Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  15. Selectionanddetailedplanningofthe final version Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  16. TIDE: Applicationof a newcommunicationconceptat Elbe estuary: „Deichbude (dykeshed)“ Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  17. Time line • Application for the planning approval: June 2010 • Public hearing: October 2010 • expected permission: end of 2011 • anticipated start of construction: end of 2011 / beginning of 2012 • The entire project will be finished end of 2014 / beginning of 2015 Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  18. Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  19. www.tide-project.eu www.hamburg-port-authority.de Thank you! Annedore.Seifert@hpa.hamburg.de | Hamburg Port Authority | Neuer Wandrahm 4, 20457 Hamburg, Germany

  20. Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  21. Constructionprogress: • soundingandclearingofexplosives Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  22. Constructionprogress: • Removalof 2 Mio. m³ in threephasesofconstruction • eachwith: • Hot Spots • otherfilled in soil • unspoiltclayandsand • Shaping Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  23. Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  24. Restoration of the Estuary: The Tidal Elbe Concept Three main Objectives for a Future Action Plan: • Attenuation of the Tidal Energy through River Engineering in the Mouth of the Estuary, • More Space for the River (Tidal Volume) in the upper Part • Optimisation of the Sediment- management considering the whole System of the Elbe Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  25. TIDE Pilot Projects: Elbe • 1. Feasibility study: engineering measures (creation of sandbars) in the estuary mouth • Modelling of expected behavior/effects 3. Evaluation of sediment trap as part of a • sediment management scheme • Functioning and effectiveness of the new approach Depth ~ 2m Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  26. In folgenden Kriterien weisen die Varianten bewertungsrelevante Unterschiede auf: • Nachhaltigkeit, einschließlich der daraus resultierenden Betriebskosten • Dämpfung • Erlebbarkeit, über potentielle Weglänge • Erzeugte Insellagen • Rückgebaute Tidegehölze • V1 dämpft signifikant besser als V2 und V3 • V3 erzeugt deutlich weniger Sedimentationen als V1 und V2 • V1 und V3 liegen in der Zielerreichung dicht beieinander • V1 und V2 liegen in den Auswirkungen dicht beieinander • Dauer und Kosten wirken sich nur unmaßgeblich auf die Auswertung aus • V1 erhält vor V2 und vor V3 in der Summe die meisten Punkte Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  27. ZIELFUNKTIONEN NATURSCHUTZ • Minimierung des Eingriffes in schützenswerte Flächen bzw. Schaffung von Ersatz für rückzubauende Teilflächen des Auwaldes, der Röhrichtflächen und des Deichgrabens • Förderung einer naturnahen Dynamik und biologischen Vielfalt Weitere Zielsetzungen ERLEBBARKEIT • Wahrnehmbarkeit der Wasserflächen und -bewegung vom Deich aus !!! Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  28. Aufstellung Bewertungskriterien und Auswertungsmatrix • Einstufung der Varianten nach verschiedenen Kriterien • Bildung von Bewertungsblöcken • Zielerreichung • Auswirkungen auf Schutzgüter • Termine • Kosten • Vergabe von Wichtungspunkten zur Abwägung der Kriterien • Herausarbeitung besonders wichtiger Kriterien • Dämpfung Tidehub  Stützung Tideniedrigwasser • Nachhaltigkeit  Beschränkung Sedimentation • Schutzgut Natur  Auwald, Lebensräume • Sensitivitätsanalyse zur Ergebniskontrolle Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  29. Installation of the rating criteria and - matrix • Rating of the alternatives using different criteria • Creation of valuation units • target achievement • impact on subjects of protection • time line • costs • Scoring to give extra important criteria more weight • attenuation of the tidal hub subsidy of the tidal low water • Sustainability  restriction of sedimentation • nature  alluvial forest, biotopes • Sensitivity analyis to verify the results Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

  30. Naturschutzfachliche Aspekte BESTANDSAUFNAHME UND BEWERTUNG: • Tide-Auwald (ca. 7,5 ha) • Der Tide-Auwald stellt einen prioritären Lebensraumtyp dar • Tideröhricht (ca. 6 ha) • Die Tideröhrichtflächen sind nach § 28 HmbNatSchG geschützt • Deichnaher Graben • Der deichnahe Graben stellt einen wertvollen Biotyp dar (nicht nach § 28 HmbNatSchG geschützt) Meeting TIDE - GIP Seine-Aval, 08.06.2011 | Annedore Seifert | Hamburg Port Authority

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