Urban Planning and cultural heritage

Transkript

1 GROUNDWATER AND CULTURAL HERITAGE 22nd NGU Seminar on Hydrology and Environment Trondheim May 2013 Urban Planning and cultural heritage The northbound light-rail alignment from the centre of Bergen, Norway Ole-Magne Nøttveit 15 May 2013

2 Introduction

3 Introduction

4 Agenda Introduction Objectives, organization, process Method: Impact assessment Excluded alternatives Alternative 1Aa Alternative 1Ab Alternative 1Ba Alternative 1Bb Summary/conclusion

5 Objectives 1. What are the consequences of eventual tunnels or tunnel entrances for groundwater in the area, and how will they affect cultural layers? How will these interventions affect the cultural layers' sensibility for oxygen? 2. Identify the areas most vulnerable for increase of pressure aggravation, vibrations and changes of surplus water flow. 3. What are the needs for archaeological excavation with the different alignments? Identify especially vulnerable areas and identify the areas that are unalienable 4. Map the vulnerability of the seafloor in regard of interventions that will be necessary to cross Vågen, the harbour.

6 A few words on hydrogeology Kevin Tuttle, consultant on hydrogeology for Statsbygg concerning Bryggen General considerations on groundwater in Bergen Evaluation of the different alignments Assessments of over ground alignments are worked into the evaluations of cultural layers if they are of consequence Tunnel entrances are assessed from the premise that they can be made impermeable

7 Assessment of culture historical significance + = Value Evaluate how valuable an area, a culture-historical millieu is to its environment Magnitude Evaluate the extent of future changes in these areas and the degree of change caused by the project Significance A balanced evaluation of the advantages and disadvantages of the project compare to Alternative 0 (present situation). Ranging from "very large positive" to very large negative"

8 Cultural heritage is but one of several topics in an impact assessment

9 Cultural heritage is but one of several topics in an impact assessment It is one of five so-called non-monetised categories to evaluate

10 Cultural heritage is but one of several topics in an impact assessment It is one of five so-called non-monetised categories to evaluate There is also the monetised categories, that can more easily be assessed from a cost-income perspective

11 Cultural heritage is but one of several topics in an impact assessment It is one of five so-called non-monetised categories to evaluate There is also the monetised categories, that can more easily be assessed from a cost-income perspective. All these different assessments put together, and the result will be a recommendation

12 Still, Cultural heritage has been av very important theme in this impact assessment

13 Excluded alternatives Bergen centre Tunnel entry in Finnegårdsgate 1Ac: several variants assessed + Vetrlidsalmenning Conflict: Cultural layers (including groundwater) Heritage over ground, (visually and functionally) Townscape Technical feasibility High cost Rising sea level (downward sloping tunnel)

14 Excluded alternatives Bergen centre Tunnels below the center of Bergen 3 excluded variants: 2Ac, 2Ad, 2Ae Conflict: Nonneseter (2Ad) Marken (2Ac) Ground og railroad (2Ae) Elevation and curve (2Ad) Townscape and accessibility (2Ac) Transport service of centre (2Ac-d-e) Technical feasibility (2Ac-d-e)

15 Excluded alternatives Bergen centre Crossing Vågen, the old harbour area 3 variants: Bridge (4Aa), submersed tube tunnel (4Ab), tunnel underground (4Ac) Conflict: Heritage over ground (4Aa, 4Ac) Cultural layers (4Ab, 4Ac) Townscape (4Aa) Technical feasibility (4Ab, 4Ac) High cost (4Ab, 4Ac) Transport service of centre (4Ac)

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17 Alternative 1Aa (street going, centre) Heritage over ground Alternativ: 1Aa Kaigaten 0/+ Christies gate - Småstrandgate + Torget Bryggen -- 0 Slottsgate Sandbrogate --- Vågsallmenning P. Motzfeldtsgt / Nygt Øvre Korskirke allm. Vetrlidsallmenning Samlet vurdering --

18 Alternative 1Aa (Street going, centre) Archaeological deposits Alternativ: 1Aa Kaigaten 0/+ Christies gate - Småstrandgate + Torget Bryggen -- 0 Slottsgate Sandbrogate --- Vågsallmenning P. Motzfeldtsgt / Nygt Øvre Korskirke allm. Vetrlidsallmenning Samlet vurdering --

19 Alternative 1Ab (Street going, centre with Vågsallmenning) Heritage over ground Alternativ: 1Aa 1Ab Kaigaten 0/+ Christies gate - - Småstrandgate + - Torget Bryggen Slottsgate Sandbrogate Vågsallmenning P. Motzfeldtsgt / Nygt Øvre Korskirke allm. Vetrlidsallmenning Samlet vurdering

20 Alternative 1Ab (Street going, centre with Vågsallmenning) Archaeological deposits Alternativ: 1Aa 1Ab Kaigaten 0/+ Christies gate - - Småstrandgate + - Torget Bryggen Slottsgate Sandbrogate Vågsallmenning P. Motzfeldtsgt / Nygt Øvre Korskirke allm. Vetrlidsallmenning Samlet vurdering

21 Alternative 2Aa (Tunnel, entry from Kaigaten) Heritage over ground Alternativ: 1Aa 1Ab 2Aa Kaigaten /+ Christies gate Småstrandgate + - Torget Bryggen Slottsgate Sandbrogate Vågsallmenning P. Motzfeldtsgt / Nygt Øvre Korskirke allm Vetrlidsallmenning Samlet vurdering

22 Alternative 2Aa (Tunell, entry from Kaigaten) Archaeological deposits Alternativ: 1Aa 1Ab 2Aa Kaigaten /+ Christies gate Småstrandgate + - Torget Bryggen Slottsgate Sandbrogate Vågsallmenning P. Motzfeldtsgt / Nygt Øvre Korskirke allm Vetrlidsallmenning Samlet vurdering

23 Alternative 2Ab (Tunell, entry from Peter Motzfeldts gate) Heritage over ground Alternativ: 1Aa 1Ab 2Aa 2Ab Kaigaten /+ Christies gate Småstrandgate + - Torget Bryggen Slottsgate Sandbrogate Vågsallmenning P. Motzfeldtsgt / Nygt Øvre Korskirke allm Vetrlidsallmenning Samlet vurdering

24 Alternative 2Ab (Tunnel, entry from Peter Motzfeldts gate) Archaeological deposits Alternativ: 1Aa 1Ab 2Aa 2Ab Kaigaten /+ Christies gate Småstrandgate + - Torget Bryggen Slottsgate Sandbrogate Vågsallmenning P. Motzfeldtsgt / Nygt Øvre Korskirke allm Vetrlidsallmenning Samlet vurdering

25 summary /conclusion 1Aa 1Ab 2Aa 2Ab Ikke prissatte konsekvenser - Kultur / Landskap, bybilde Bymiljø, nærmiljø og friluftsliv / Naturmiljø Naturressurser Rangering ikke prissatte Prissatte konsekvenser, indikatorer - Investeringskostnader i mrd kr 1,1 1,1 2,1 1,5 - Tid i minutter* o Kjøretid Bystasjonen Sandviken o Reisetid Sjøfartsmonumentet Sandviken 08:47 05:43 08:47 05:43 06:59 08:15 Rangering prissatte konsekvenser Samlet rangering :47 08:08 Negative significance related to heritage for all alternatives! Relatively speaking, street going line in front of Bryggen is the better alternative Archaeological deposits: slicing vs total removal (I know it is an simplification, but you can't repeat the whole report in a conclusion )

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