utbredning, lakvattenspridning och påverkan på omgivning - Sysav

Innehållsförteckning
1 Inledning ............................................................................................................ 1
1.1 Bakgrund................................................................................................................................1
1.2 Syfte....................................................................................................................................... 2
1.3 Utförda undersökningar ......................................................................................................... 2
1.4 Uppdelning............................................................................................................................. 2
1.5 Läsanvisningar ....................................................................................................................... 2
2 Områdesbeskrivning ........................................................................................ 3
3 Regional geologi ............................................................................................... 5
3.1 Berggrundsgeologi................................................................................................................. 5
3.2 Kvartärgeologi ....................................................................................................................... 6
3.3 Geologisk förväntningsmodell............................................................................................... 7
4 Deponin och dess lakvatten............................................................................. 8
4.1 Deponins faser ....................................................................................................................... 8
4.1.1 Fas 1: Inledande kortvarig aerob fas.................................................................................. 8
4.1.2 Fas 2: Acidogen fas ........................................................................................................... 8
4.1.3 Fas 3 och 4: Metanogen fas ............................................................................................... 9
4.1.4 Fas 5: Humusfas ................................................................................................................ 9
4.2 Kvarhållande processer.......................................................................................................... 9
4.3 Lakvatten ............................................................................................................................. 10
4.3.1 Lakvattenbildning............................................................................................................ 10
4.3.2 Lakvattnets karaktär ........................................................................................................ 10
4.4 Lakvattenplymen.................................................................................................................. 12
4.4.1 Lakvattenspridande processer.......................................................................................... 13
4.4.2 Redoxförhållanden........................................................................................................... 14
4.5 Lakvattensituationen vid Ekeboda avfallsupplag ................................................................ 16
4.5.1 Avledning av lakvatten idag ............................................................................................ 16
4.6 Erfarenheter av resistivitets- och IP-mätningar ................................................................... 17
4.6.1 Resistivitetsmätningar ..................................................................................................... 17
4.6.2 IP-mätningar .................................................................................................................... 18
5 Geofysiska metoder........................................................................................ 20
5.1 Resistivitetsmätning............................................................................................................. 20
5.1.1 Teori ................................................................................................................................20
5.1.2 Metod............................................................................................................................... 22
5.1.3 Processering av data ........................................................................................................ 25
5.1.4 Resistivitetsmetodens begränsningar............................................................................... 28
5.2 Inducerad polarisation.......................................................................................................... 28
5.2.1 Bakgrund ......................................................................................................................... 28
5.2.2 Teori ................................................................................................................................29
5.2.3 Normaliserad IP............................................................................................................... 32
5.2.4 Metod............................................................................................................................... 32
5.2.5 Processering av data ........................................................................................................ 32
5.3 Magnetometri....................................................................................................................... 33
5.3.1 Teori ................................................................................................................................33
5.3.2 Metod............................................................................................................................... 33
6 Fältundersökning............................................................................................ 35
6.1 Utrustning ............................................................................................................................ 35
6.2 Profildragning ...................................................................................................................... 36
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