1 (74) Förvaltande Enhet Diarie-/Upphandlingsnummer Dokumentnummer Investering, Projekt Getingmidjan CST-SST Reinvestering TRV 2014/51433 139547-03-025-1 Handläggare/upprättad av Granskad (projektör) Godkänd (projektör) Uppdragsnummer (projektör) (projektör) Caroline Bohlin Fredrick Marelius Stefan Eidissen 7500569000 Handläggare namn/sign. Granskad (beställare) Godkänd (beställare) Datum (beställare) Veronica Bergfors- Christina Odén Christina Odén Runing 2015-11-26 STOCKHOLMS C - STOCKHOLMS SÖDRA HYDROLOGI 139547 STRÖMNINGSBERÄKNINGAR UNDERLAG INFÖR ANSÖKAN OM TILLSTÅND FÖR VATTENVERKSAMHET Rev Revideringen avser Datum Upprättad av Granskad av Utskrivet: 2015-11-24 06:36 TRAFIKVERKET 139547-03-025-1 Investering, Projekt 139547 STRÖMNINGSBERÄKNINGAR 2015-11-26 Getingmidjan CST-SST HYDROLOGI REV. Reinvestering UNDERLAG INFÖR ANSÖKAN OM TILLSTÅND FÖR VATTENVERKSAMHET 2 (74) INNEHÅLLS FÖRTECKNING 1 INLEDNING ............................................................................................................................................... 4 1.1 BAKGRUND ............................................................................................................................................... 4 1.2 HÖJDSYSTEM ............................................................................................................................................. 4 1.3 OMRÅDESBESKRIVNING ............................................................................................................................... 5 1.3.1 Mälaren ............................................................................................................................................. 5 1.3.2 Nuvarande Slussen ............................................................................................................................ 8 1.3.3 Nya Slussen........................................................................................................................................ 9 1.3.4 Effekter av förändrad reglering ....................................................................................................... 11 1.3.5 Högflödet år 2000 ........................................................................................................................... 13 1.4 BOTTENMATERIAL ..................................................................................................................................... 15 1.4.1 Tidigare sedimentprovtagningar ..................................................................................................... 15 1.4.2 Sedimentprovtagning Sweco, 2014 ................................................................................................. 15 2 METODIK ............................................................................................................................................... 17 2.1 UPPBYGGNAD AV TERRÄNGMODELL ............................................................................................................. 17 2.1.1 Syfte ................................................................................................................................................. 17 2.1.2 Underlag .......................................................................................................................................... 17 2.1.3 Ekolodningar ................................................................................................................................... 18 2.1.4 Användning av brodata ................................................................................................................... 19 2.1.5 Citybanans sänktunnel .................................................................................................................... 22 2.1.6 Förändrad geometri för den nya Slussen ........................................................................................ 23 2.1.7 Terrängmodeller .............................................................................................................................. 23 2.2 UPPRÄTTANDE AV HYDRAULISK MODELL ........................................................................................................ 25 2.3 BERÄKNING AV BOTTENSKJUVSPÄNNING ........................................................................................................ 29 2.4 BERÄKNING AV PONTONERS DÄMNINGSEFFEKT I NORR- RESPEKTIVE SÖDERSTRÖM ................................................ 32 2.4.1 Pontonkonfiguration i Norrström .................................................................................................... 32 2.4.2 Pontonkonfiguration i Söderström .................................................................................................. 33 2.4.3 Beräkningsmetodik .......................................................................................................................... 33 2.5 BERÄKNING AV DÄMNING PGA. SPONTNING I NORRSTRÖM ............................................................................... 35 3 RESULTAT .............................................................................................................................................. 36 3.1 SCENARIO 1: NUVARANDE SLUSSEN ............................................................................................................. 36 3.1.1 Hydraulik ......................................................................................................................................... 36 3.1.2 Erosionsrisk...................................................................................................................................... 41 3.2 SCENARIO 2: NYA SLUSSEN ........................................................................................................................ 45 3.2.1 Hydraulik ......................................................................................................................................... 45 3.2.2 Erosionsrisk...................................................................................................................................... 50 3.3 KÄNSLIGHETSANALYS ................................................................................................................................. 54 3.3.1 Inverkan av batymetrikorrigering uppströms Centralbron i Norrström .......................................... 54 3.3.2 Inverkan av sedimentationsbassäng i Norrström ............................................................................ 54 3.3.3 Inverkan av z-nivå för beräkning av bottenskjuvspänning .............................................................. 56 3.3.4 Inverkan av lägre ekvivalent sandråhet i Söderström ..................................................................... 59 3.3.5 Inverkan av batymetrikorrigering vid Citybanans sänktunnel......................................................... 60 3.4 PONTONERS DÄMNINGSEFFEKT I NORR- RESPEKTIVE SÖDERSTRÖM..................................................................... 62 3.4.1 Norrström ........................................................................................................................................ 62 3.4.2 Söderström ...................................................................................................................................... 66 3.5 DÄMNING PGA. SPONTNING I NORRSTRÖM.................................................................................................... 67 4 SLUTSATSER ........................................................................................................................................... 69 4.1 UPPDRAGSBESKRIVNING ............................................................................................................................ 69 Utskrivet: 2015-11-24 06:36 TRAFIKVERKET 139547-03-025-1 Investering, Projekt 139547 STRÖMNINGSBERÄKNINGAR 2015-11-26 Getingmidjan CST-SST HYDROLOGI REV. Reinvestering UNDERLAG INFÖR ANSÖKAN OM TILLSTÅND FÖR VATTENVERKSAMHET 3 (74) 4.2 HYDRAULIK .............................................................................................................................................. 69 4.2.1 Scenario 1 ........................................................................................................................................ 69 4.2.2 Scenario 2 ........................................................................................................................................ 69 4.2.3 Översvämningsrisker ....................................................................................................................... 69 4.3 EROSIONSRISK .......................................................................................................................................... 70 4.3.1 Bedömningsmetod .......................................................................................................................... 70 4.3.2 Scenario 1 ........................................................................................................................................ 70 4.3.3 Scenario 2 ........................................................................................................................................ 71 4.4 PONTONERS DÄMNINGSEFFEKT ................................................................................................................... 72 4.4.1 Norrström .......................................................................................................................................