Urriðafoss Hydroelectric Project - Landsvirkjun · 2013-03-04 · Jarðfræðistofan ehf 2002 3...

LV-2002/042

apríl 2002

Urriðafoss Hydroelectric ProjectRiver bed of Þjórsá between Skeið and Holt

Geological investigations in April 2002

LV-2002/042

Urriðafoss Hydroelectric Project

River bed of Þjórsá between Skeið and Holt

Geological investigations in April 2002

April 2002

Joint Venture Sweco/Hnit/Rafhönnun

Jarðfræðistofan Ehf

JFS Geological services Ltd

Table of contents

1 Brief geological conditions ......................................................................................2

2 Investigations ..........................................................................................................2

2.1 Area 1 ..............................................................................................................2

2.2 Area 2 ..............................................................................................................2

2.3 Area 3 ..............................................................................................................3

3 Conclusion..............................................................................................................3

Tables

Table 1 Cobra drilling on the east bank Table 2 Cobra drilling on the west bank Table 3 Rotary and percussion drilling on the west bank

Drawings

Drawing 1 Location map 1 Drawing 2 Location map 2

Graphic drilling logs

Cobra boreholes UC-1 through UC-53, 7 sheets Rotary and percussion boreholes ULO-56 through ULO-75, 4 sheets

___________________________________________________________________________________________ Jarðfræðistofan ehf 2002 2 Urriðafoss Hydroelectric Project

1 Brief geological conditions

Upstream from the proposed damsite in Þjórsá (at the upstream end of the rapids at Þjótandi) the Þjórsá river flows along relatively flat area from 44 m a.s.l. until the next rapids exist at 54 m a.s.l. some 15 km upstream, where the island Árnes is splitting the river into two major channels. The river flows in a braided sandy channels along relatively flat area near the eastern margin of the extensive Þjórsá lava, which covers the lowland in the Skeið area along the west bank of the river. The east bank of the river is highly affected by the hummocky landscape of the old Pleistocene bedrock found discontinuously along the bank.

2 Investigations

The investigations described here were carried out on behalf of Landsvirkjun during spring 2002. The investigation layout was designed by the engineering consultants Hnit and Sweco Internatinal AB. Jarðfræðistofan (JFS Geological services) carried out the investigations as their subcontractor. Ræktunarsamband Flóa og Skeiða performed the percussion drilling.

The investigations in the river-bed of Þjórsá was made using two kinds of drilling methods, making very different capabilities of penetrating the sediments.

Firstly light Cobra percussion drilling (approx 30 kg vibrating hammer drilling with 25 mm steel rods), 53 holes with a total of 250 drilling meters.

Secondly rotary and percussion drilling using 22 tons drill rig with rotary drill bit of 62 mm and thrust of approx. 5 tons and additional percussion hammering where considered acceptable and convenient, 20 holes with a total of 150 m.

For convenience the research area will be divided into three parts as shown on Drawings 1 and 2.

2.1 Area 1

The upstream part from Árnes to Kaldárholt. All investigations were made on the west bank of the river.

As the velocity of the river decreases from the rapids at Árnes in the upstream end, the most coarse grained material is found there as gravel and sandy gravel with grain size up to some 100 mm in "former river channels" of high velocity. The main fraction of grain size seems to be sand with pebbles up to 50 mm.

Rotary and percussion drilling (holes ULO 56 through ULO-71) shows generally approx. 5 m thick layer of loose material supposedly sandy gravel. Few cobra boreholes were drilled in the downstream part of this area (UC-43 through UC-46) showing very similar results as the rotary drilling or 5-7 m thick loose sediments.

2.2 Area 2

The middle part of the area, from the alluvium north of Kaldárholt towards Blesastaðir. This area was investigated with cobra drilling on the east bank and both cobra and rotary drilling on the west bank. The sandy gravel is generally more fine grained than in Part 1 and lower ratio of pebbles (10-30%), seldom exceeding 3-5 cm in diameter. As elsewhere the coarse


grained material is mainly confined to lenses and layers in former channels of higher velocity on the river.

East bank. Cobra boreholes UC-16 through UC-33, located in this part show approx. 5 m thickness of loose sediments (depth varying between 4,5-6 m).

West bank. Cobra boreholes UC-34 through UC-42 and UC-49 through UC-53 are within this area in addition to percussion holes ULO-72 through ULO-75. The cobra holes show 4-6 m thick loose sediments but the percussion drilling shows approx. 7 m thickness, possibly mixed with some larger stones at the base. Further below there is higher resistance probably in the top scoria of the Þjórsá lava mixed with sand.

2.3 Area 3

The downstream part of the area was investigated with Cobra boreholes UC-1 through UC-15 on the east bank. The sediments on the surface is mainly sand with scattered small pebbles and channels of sandy fine grained gravel.

These cobra holes show 3-5 m thick loose sediments of sand and sandy gravel. Usually the drilling stopped slowly on some semi-hardened material. One hole reached almost 7 m depth. In addition four percussion holes ULO-30 through ULO-33 were drilled further downstream near Kálfhóll on the west bank in the spring 2001. Three holes showed 3,5 - 7 m thick sediments but hole ULO-32, (probably near the eastern margin of the Þjórsá lava) reached almost 9 m depth without touching harder material.

3 Conclusion

Drilling has revealed mainly 5 m thick sediments, resting on some harder irregular base. The alluvium shows some grading in grain size from more coarse grained gravely sand in the uppermost part to sandy fine grained gravel in the downstream part. Groundwater level is very close to the surface. The sediments are easily excavatable and based on visual grain sizes, probably most of it could be pumped. If excavated by pumping, further investigations are needed to verify grain size distribution.


Table 1. Cobra drilling on the east bank

Hole East North Elev. m Depth to high resist. UC-01 425530,8 386843,2 Not surv. 3,6 UC-02 425598,1 386864,7 Not surv. 2,9 UC-03 425737,9 386800,2 Not surv. 2,7 UC-04 425861,7 386762,5 Not surv. 3,1 UC-05 425977,3 386711,4 Not surv. 3,3 UC-06 425813,2 386356,2 Not surv. 3,5 UC-07 425619,5 386455,7 Not surv. 4,1 UC-08 426090,5 386684,5 Not surv. 4,6 UC-09 425784,0 387230,8 Not surv. 3,5 UC-10 426058,3 387117,8 Not surv. 4,3 UC-11 426195,6 387556,2 50,75 6,8 UC-12 426294,2 387505,3 50,33 4,2 UC-13 426419,2 387401,0 51,26 5,2 UC-14 426294,1 387866,5 50,33 4,1 UC-15 426416,1 387760,6 51,11 4,1 UC-16 426341,2 388454,4 50,90 5,15 UC-17 426470,2 388373,6 50,93 6,05 UC-18 426656,4 388276,8 51,20 5,5 UC-19 426451,8 388698,2 51,15 4,5 UC-20 426628,5 389061,0 51,50 4,4 UC-21 426760,1 388942,2 51,39 4,9 UC-22 426950,5 388762,4 52,01 3,6 UC-23 426884,2 389372,2 51,67 5,2 UC-24 427041,0 389260,0 51,80 5,8 UC-25 427354,1 389570,8 51,62 6,3 UC-26 427049,7 389931,8 52,11 4,5 UC-27 427180,9 389836,8 51,14 4,6 UC-28 427492,0 390458,5 51,30 6,4 UC-29 427633,9 390327,8 51,77 3,7 UC-30 427759,4 390094,4 51,82 4,8 UC-31 428108,0 390706,5 51,82 5,8 UC-32 428215,0 390438,5 52,22 3,9 UC-33 428654,7 390594,2 52,19 4,4


Table 2. Cobra drilling on the west bank

Hole East North Elev. m Depth to high resist. UC-34 426375,3 389587,4 51,40 5,2 UC-35 426759,3 389942,3 51,72 4,3 UC-36 426364,6 390121,2 51,32 4 UC-37 426900,0 390127,0 51,80 5,4 UC-38 426725,9 390351,9 51,19 4,15 UC-39 427025,7 390418,0 51,83 4,5 UC-40 426670,4 390462,3 51,85 4,65 UC-41 427139,1 390592,8 51,84 5,35 UC-42 427000,2 390725,0 51,44 5,1 UC-43 427470,0 390864,3 52,58 5,1 UC-44 427343,6 391015,6 51,98 5,35 UC-45 427858,2 390987,0 52,48 6,6 UC-46 427827,6 391297,0 52,70 5,5 UC-47 428424,7 390792,6 53,01 5,3 UC-48 428444,9 391193,7 52,93 5,15 UC-49 426420,4 389239,5 50,88 5,2 UC-50 426209,8 388716,2 50,65 4,6 UC-51 426078,3 388423,4 50,44 6,6 UC-52 425854,6 388597,1 50,76 3,7 UC-53 425991,7 388976,1 50,42 4,8

Table 3. Rotary and percussion drilling on the west bank

Hole East North Elev. m Depth to high resist. Depth of hole ULO-56 430611,1 391411,5 53,70 5,7 8,7 ULO-57 430353,5 391531,1 54,31 4,5 5,7 ULO-58 430255,4 391239,3 53,36 5,2 5,7 ULO-59 430216,3 391375,7 53,72 3,5 5,7 ULO-60 429880,0 391413,9 53,58 5 5,7 ULO-61 429791,8 391267,8 52,76 4,5 8,7 ULO-62 429485,9 391188,9 53,09 6,5 7,9 ULO-63 429255,0 390879,1 52,55 4,2 5,7 ULO-64 428920,1 390695,2 53,12 3,7 5,7 ULO-65 428915,4 391179,1 53,14 4 5,7 ULO-66 428445,5 391090,9 52,90 6,2 8,7 ULO-67 428425,1 390800,1 52,97 4 5,7 ULO-68 428143,3 391141,9 52,98 5,5 6,3 ULO-69 427859,3 390988,0 52,58 5 5,7 ULO-70 427641,4 391118,3 52,77 >5,7 5,7 ULO-71 427503,5 390883,0 52,46 7 11,1 ULO-72 426832,7 390561,8 51,63 >7,5 8,7 ULO-73 426891,4 390109,1 51,93 7,5 8,7 ULO-74 426321,5 389858,7 51,41 >8,7 8,7 ULO-75 426420,4 389242,9 50,92 9 11,7

70

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65707580

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5560

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75

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90

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80

75

7065

60

55

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55 55

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60

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55

55

55

65

60

50

ttir

Brautarholt

Kaldárholt

X = 427000

Y =

3905

00

X = 430000

Y =

3915

00

500

X = 426000

Y =

3915

00

UC-19 / 4.5

UC-20 / 4.4

UC-21 / 4.9

UC-22 / 3.6

UC-23 / 5.2

UC-24 / 5.8

UC-25 / 6.3

UC-26 / 4.5

UC-27 / 4.6

UC-34 / 5.2

UC-49 / 5.2

UC-50 / 4.6

UC-53 / 4.8

ULO-74 / 8.7

ULO-75 / 9.0

UC-28 / 6.4

UC-29 / 3.7

UC-30 / 4.8

UC-31 / 5.8

UC-32 / 3.9

UC-33 / 4.4

UC-35 / 4.3

UC-37 / 5.4

UC-38 / 4.15

UC-39 / 4.5

UC-40 / 4.65

UC-41 / 5.35

UC-42 / 5.1

UC-43 / 5.1

UC-44 / 5.35

UC-45 / 6.6

UC-46 / 5.5

UC-47 / 5.3

UC-48 / 5.15

ULO-56 / 5.7

ULO-57 / 4.5

ULO-58 / 5.2

ULO-59 / 5.7ULO-60 / 5.0

ULO-61 / 4.5

ULO-62 / 6.5

ULO-63 / 4.2

ULO-64 / 3.7

ULO-65 / 4.0

ULO-66 / 6.2

ULO-67 / 4.0

ULO-68 / 5.5

ULO-69 / 5.0ULO-70 / 5.7

ULO-71 / 7.0

ULO-72 / 8.7

ULO-73 / 7.5UC-36 / 4.0

Area 2

Area 1

Area 2

Landsvirkjun DesignDrawnChk.Appr.

ScaleHH

April 2002

DrawingÁgG

JFS - 47Urriðafoss Hydroelectric ProjectJarðfræðistofan Ehf


1

0 1,0 km

UC-01 / 5.0 Cobra hole number / Thickness (m) of loose sediment

ULO-56 / 5.0 Percussion hole number / Thickness (m) of loose sediment

Location map

Intake lake areaÞjórsá river bed

55

55

55

80

55

50

50

80

70

75

65

70

75

6065 70 75 80 85 90

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55

50

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55

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50

50

50

110

105

100

95

90

85

80

75

70

65

60

55

50

50

50

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60

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65

60

55

55

Skeiðháholt

X = 425000

Y =

3880

00

Blesastaðir

UC-11 / 6.8

UC-12 / 4.2

UC-13 / 5.2

UC-14 / 4.1

UC-15 / 4.1

UC-16 / 5.15

UC-17 / 6.05UC-18 / 5.5

UC-19 / 4.5

UC-20 / 4.4

UC-21 / 4.9

UC-22 / 3.6

UC-24 / 5.8

UC-49 / 5.2

UC-50 / 4.6

UC-51 / 6.8

UC-52 / 3.7

UC-53 / 4.8

ULO-75 / 9.0

UC-09 / 3.5

UC-10 / 4.3

UC-08 / 4.6UC-05 / 3.3

UC-04 / 3.1UC-03 / 2.7

UC-02 / 2.9

UC-01 / 3.6

UC-07 / 4.1

UC-06 / 3.5

Area 3

Area 2

Landsvirkjun DesignDrawnChk.Appr.

ScaleHH

April 2002

DrawingÁgG

JFS - 47

Location map

Urriðafoss Hydroelectric Project

Intake lake area



2

0 1,0 km

UC-01 / 5.0 Cobra hole number / Thickness (m) of loose sediment

ULO-56 / 5.0 Percussion hole number / Thickness (m) of loose sediment

Þjórsá river bed

UC - 1

0

5

Depth (m)

Sandy gravel - fine gravel.0-1 m 10 sec.1-2 m 15 sec.

3.6 m bottom in high resistance,easy to pull up.

2-3 m 20 sec.3-3.6 m 15 sec.

X: 425530.820 Y: 386843.190

Elev.: ?

The hole is 4 m from the river.Ground ice is in 3 digged holes closer to the river at 0.2-0.3 m depth,no ice found in the hole.

UC - 2

0

5

Depth (m)

0-1 m 15 sec., loose gravel. Ice at 0.3-0.4 m.

1-2 m 20 sec. Low resistance, higher resistance at 1.4-1.6 m.2-2.9 m 15 sec. Low resistance2.9 m bottom, hard high resistance.

X: 425598.063 Y: 386864.703

Elev.: ?

The hole is ~100 m from the river.

UC - 3

0

5

Depth (m)

0-1 m low resistance. Ice lens at 0.4-0.5 m.1-2 m 30 sec.

2-2.5 m 30 sec.2.5-2.7 m 30 sec.

X: 425737.928 Y: 386800.164

Elev.: ?

2.7 m bottom, very slow drilling.The hole is 200 m from UC-2,west of small channel.

UC - 5X: 425977.312 Y: 386711.424

UC - 6X: 425813.174 Y: 386356.241

Sandy gravel. Sandy gravel.

Urriðafoss Hydroelectric ProjectDesign

Drawn HH

AgG

JFS - 47

Cobra drilling

April 2002

Drawing

Landsvirkjun

UC-1 through UC-9

Drill. contr.

Time of drilling April 2002 Intake lake area - East bank



UC - 4

0

5

Depth (m)

0-0.6 m loose gravel. Ice lens at 0.4-0.5 m.0.6-1 m increasing resistance.

1-2 m 60 sec. high resistance, silt?2-3 m 80 sec. high resistance, silt?

X: 425861.654 Y: 386762.517

Elev.: ?

3-3.1 m high resistance, silt?3.1 m bottom, high resistance, harder to pull up than before.

Sandy gravel.

3-3.3 m 60 sec. then stop.

0

5

Depth (m)

3.3 m bottom in hard material.Easy to pull up.

0-1 m loose sand and gravel.1-1.5 m 20 sec. low resistance.

2.7-3 m 60 sec. high resistance

1.5-2 m 40 sec. higher resistance.2-2.7 m 60 sec. higher resistance.

Elev.: ?

The hole is at the west bank of channelca. 100-150 m from the east bank andsmall hill.

3.2-3.4 m 60 sec.

0

5

Depth (m)

3.4-3.5 m 60 sec. high resistance.3.5 m bottom.

0-1 m 15 sec low resistance,ice lens at 0.4-0.5 m.1-1.5 m 15 sec.

3-3.2 m 20 sec.

1.5-2 m 30 sec. higher resistance.2-3 m 40 sec.

Elev.: ?

The hole is ~200 m downstream from previously drilled line.


UC - 9

0

5

Depth (m)

0-1 m 10 sec. low resistance. Ice lens at 0.4-0.5 m.1-2 m 20 sec. low resistance.

2-3 m 30 sec. low resistance.3-3.5 m 30 sec. low resistance.

X: 425783.965 Y: 387230.789

Elev.: ?

3.5 m bottom, stopped on hard surface.Easy to pull up.

Sandy gravel.

3.6-4 m 40 sec.

UC - 7

0

5

Depth (m)

4-4.1 m 30 sec.

0-1 m 10 sec low resistance,ice lens 5-10 cm.1-2 m 10 sec. low resistance.

3-3.6 m 30 sec.

4.1 m bottom.

2-3 m 20 sec. higher resistance.

X: 425619.515 Y: 386455.738

Elev.: ?

The hole is in front of a summerhouseon the west bank of the river.

Sandy gravel.

4-4.5 m 80 sec. high resistance

UC - 8

0

5

Depth (m)

4.5-4.6 m 30 sec.

0-1 m 15 sec low resistance.1-2 m 30 sec. higher resistance.

3-4 m 45 sec.

4.6 m bottom very high resistance.Hard to pull up.

2-3 m 40 sec.

X: 426090.494 Y: 386684.510

Elev.: ?

The hole is 50 m from the upstreamend of rock hill and ~100 m fromUC-5 in drilling line 1.

Sandy gravel.

Urriðafoss Hydroelectric Project JFS - 47LandsvirkjunJarðfræðistofan Ehf


Note: Drilling time in seconds.

UC-1 to UC-10 location based on orthophoto. Elevation not surveyed.

UC - 10

0

5

Depth (m)

0-1 m low resistance.

1-2 m 15 sec. low resistance.

2-3 m 20 sec. low resistance.3-4 m 40 sec. higher resistance.

X: 426058.315 Y: 387117.846

Elev.: ?

4-4.3 m 15 sec.4.3 bottom stopped on hard surface.

UC - 11

0

5

Depth (m)

0-1 m low resistance.Ice lens at 0.4-0.5 m.1-2 m 25 sec. low resistance.2-3 m 40 sec. higher resistance.3-4 m 45 sec.

X: 426195.6463 Y: 387556.2157

Elev.: 50.7518

4-4.5 m 30 sec.4.5-5 m 35 sec.5-6 m 70 sec. higher resistance at 5.5 m.6-6.8 m 70 sec.6.8 m bottom, stopped in high resistance,hard to pull up.

UC - 12

0

5

Depth (m)

0-1 m low resistance.Ice lens at 0.2-0.4 m.1-1.3 m 10 sec. low resistance.

2-3 m 40 sec. 3-3.4 m 25 sec.

X: 426294.1736 Y: 387505.2989

Elev.: 50.3289

3.4-3.8 m 40 sec.3.8-4 m 15 sec. higher resistance.4-4.2 m 35 sec.

4.2 m bottom, stopped in high resistance,hard to pull up.

New drilling line, 8 m from the river bank.

1.3-2 m 25 sec. higher resistance, silt?

UC - 13

0

5

Depth (m)

0-1 m 20 sec. low resistance. Ice lens at 0.2-0.3 m.1-2 m 20 sec. 2-2.5 m 15 sec.

3-3.6 m 35 sec.

X: 426419.2020 Y: 387401.0349

Elev.: 51.2632

3.6-4 m 30 sec. 4-4.4 m 30 sec. 4.4-5 m 40sec.

~100 m east of UC-11.

2.5-3 m 30 sec. higher resistance.

5-5.2 m 20 sec. 5.2 m bottom, stopped in veryhigh resistance, hard to pull up.

UC - 14

0

5

Depth (m)


1-2 m 15 sec.

2-3 m 25 sec.

3.6-4 m 35 sec. increasing resistance.

X: 426294.1377 Y: 387866.5270

Elev.: 50.3325

4-4.1 m stopped in high resistance.Bottom at 4.1 m.

3-3.6 m 30 sec.

UC - 15

0

5

Depth (m)

0-1 m low resistance. Ice lens at 0.2-0.5 m.1-2 m 15 sec.2-3 m 25 sec.

3.6-4 m 40 sec.

X: 426416.0804 Y: 387760.6409

Elev.: 51.1056

4-4.1 m 40 sec.Bottom at 4.1 m.

3-3.6 m 60 sec. increasing resistance.

UC - 17

0

5

Depth (m)

0-1 m 5 sec.1-2 m 15 sec.

2.6-3 m 20 sec. 3-3.6 m 60 sec. increasing resistance.

X: 426470.2267 Y: 388373.5725

Elev.: 50.9264

3.6-4 m 30 sec.4-4.2 m 20 sec. 4.2-4.4 m 30 sec.4.4-4.6 m 30 sec

2-2.6 m 20 sec.

6-6.05 m stopped in high resistance.

4.6-5 m 60 sec. 5-5.6 m 50 sec.5.6-6 m 50 sec

UC - 18

0

5

Depth (m)

0-1 m low resistance.Ice 0.3-0.4 m.1-2 m 20 sec.

3-4 m 100 sec. increasing resistance. 4-4.7 m 60 sec.

X: 426656.4480 Y: 388276.7965

Elev.: 51.1968

4.7-5 m 20 sec.5-5.4 m 50 sec. 5.4-5.5 m 20 sec.5.5 m bottom in high resistance.

2-3 m 40 sec.

Sandy gravel. Sandy gravel. Sandy gravel.


y jDesign

Drawn HH

AgG

Cobra drilling

April 2002

Drawing

UC-10 through UC-18

Drill. contr.

Time of drilling April 2002 Intake lake area - East bankg

UC - 16

0

5

Depth (m)

0-1 m 10 sec. low resistance.

1-2 m 15 sec.2-3 m 40 sec.

3.4-3.6 m 30 sec. increasing resistance.

X: 426341.2016 Y: 388454.3942

Elev.: 50.9027

3.6-4 40 sec.

3-3.4 m 20 sec.

4-4.2 m 30 sec.4.2-4.8 60 sec.4.8-5 m 20 sec.5-5.15 m 35 sec.Stopped in high resistance.

Sandy gravel.

Urriðafoss Hydroelectric ProjectDesign AgG/HH

JFS - 47

April 2002

LandsvirkjunDrill. contr.

i f d illi Intake lake area - East bank





UC - 21

0

5

Depth (m)

0-1 m 10 sec. low resistance. 1-1.3 m 10 sec.

2-3 m 60 sec.

4-4.5 m 60 sec.

X: 426760.1403 Y: 388942.1824Elev.: 51.3869

4.5-4.8 m 60 sec.

3-4 m 60 sec.

4.8-4.9 m 25 sec.4.9 m bottom in high resistance.


Drawn HHCobra drilling Drawing

UC-19 through UC-27

Time of drilling April 2002 Intake lake area East bank

UC - 19

0

5

Depth (m)

0-1 m 10 sec.1-2 m 15 sec.

3-3.4 m 40 sec. increasing resistance.3.4-4 m 40 sec.

X: 426451.8476 Y: 388698.1828Elev.: 51.1511

4-4.4 m 40 sec.4.4-4.5 m 25 sec. 4.5 m bottom in high resistance.

2-3 m 25 sec.

UC - 20

0

5

Depth (m)

0-1 m 10 sec.1-2 m 15 sec.

3-3.4 m 15 sec. 3.4-4 m 90 sec. increasing resistance.

X: 426628.5057 Y: 389061.0333Elev.: 51.4971

4-4.2 m 30 sec.4.2-4.4 m 60 sec. 4.4 m bottom in high resistance.

2-3 m 20 sec.

UC - 22

0

5

Depth (m)

0-1 m 10 sec. low resistance. 1-2 m 20 sec.


3.2-3.4 m 40 sec.

X: 426950.4990 Y: 388762.4332Elev.: 52.0121

3.4-3.6 m 60 sec.

3-3.2 m 30 sec.

3.6 m bottom in high resistance.

2-2.7 m 30 sec.

UC - 23

0

5

Depth (m)

0-1 m low resistance. 1-1.6 m 20 sec.

1.9-2.9 m 75 sec. increasing resistance.

3.9-4.9 m 62 sec.

X: 426884.1625 Y: 389372.2034Elev.: 51.6676

4.9-5.1 20 sec.

2.9-3.9 m 116 sec.


1.6-1.9 m 20 sec.

5.1-5.2 m 35 sec.

UC - 24

0

5

Depth (m)


1-2 m 20 sec.

3-3.6 m 48 sec. increasing resistance.

4-5 m 96 sec.

X: 427040.9654 Y: 389259.9561Elev.: 51.8009

5-5.5 42 sec.

3.6-4 m 25 sec.


2-3 m 37 sec.

5.5-5.8 m 60 sec.

UC - 25

0

5

Depth (m)

0-1 m low resistance1-2 m < 10 sec.

2.6-2.9 m 15 sec. 2.9-3.2 m 20 sec.

X: 427354.1264 Y: 389570.7628Elev.: 51.6170

3.2-3.9 m 60 sec. increasing resistance.3.9-4.9 m 120 sec. 4.9-5.9 m 100 sec.

2-2.6 m 20 sec.


UC - 26

0

5

Depth (m)

0-1 m low resistance.Ice 0.4-0.5 m.1-2 m 12 sec.

3-4 m 55 sec. 4-4.4 m 50 sec. increasing resistance.

X: 427049.6575 Y: 389931.7908Elev.: 52.1102

4.4-4.5 m 40 sec.

2-3 m 20 sec.


UC - 27

0

5

Depth (m)

0-1 m low resistance.1-2 m 25 sec.

2.6-3 m 50 sec. 3-3.4 m 11 sec.

X: 427180.8994 Y: 389836.7722Elev.: 51.1447

3.4-4 m 55 sec.

2-2.6 m 20 sec.

4-4.6 m 130 sec.






Drawn HH

HH

JFS - 47

Cobra drilling

April 2002

Drawing

Landsvirkjun

UC 28 through UC 33

Drill. contr.

Time of drilling April 2002 Intake lake area - East bank





UC-28 through UC-33

UC - 28

0

5

Depth (m)

0-1 m low resistance.Ice lens at 0.3-0.4 m.1-2 m 10 sec.

2.3-3 m 65 sec. 3-4 m 90 sec.

X: 427491.9892 Y: 390458.4610Elev.: 51.2988

4-5 m 100 sec.

2-2.3 m 15 sec.

5-6 m 100 sec.

6.4 m bottom in high resistance.6-6.4 m 60 sec.

UC - 29

0

5

Depth (m)


1-2 m < 10 sec.

2.7-3 m 12 sec.

3.3-3.7 m 75 sec.

X: 427633.9300 Y: 390327.8412Elev.: 51.7698

3-3.3 m 20 sec.


2-2.7 m < 10 sec.

UC - 30

0

5

Depth (m)


1-2 m < 10 sec.

2.7-3 m 12 sec.

3.2-3.4 m 40 sec.

X: 427759.4011 Y: 390094.4299Elev.: 51.8210

3-3.2 m 30 sec.


2-2.7 m 10 sec.

3.9-4.8 m 120 sec.3.4-3.9 m 58 sec.

UC - 31

0

5

Depth (m)

0-1 m low resistance.Ice lens at 0.2-0.3 m.1-2 m < 10 sec.

3-4 m 83 sec.

5-5.6 m 40 sec.

X: 428107.9871 Y: 390706.5181Elev.: 51.8153

4-5 m 67 sec.


2-3 m 35 sec.

5.6-5.8 m 30 sec.

UC - 32

0

5

Depth (m)


1-2 m < 10 sec.

3-3.5 m 40 sec.

X: 428215.0097 Y: 390438.4801Elev.: 52.2177


2-3 m 21 sec.

UC - 33

0

5

Depth (m)


1-2 m 7 sec.

3-4 m 17 sec. 4-4.4 m 10 sec.

X: 428654.6932 Y: 390594.1779Elev.: 52.1886

4.4 m bottom probably on hard basalt.

2-3 m 10 sec.


Sandy gravel. Sandy gravel. Gravel at surface.


Drawn HH

AgG/HH

JFS - 47

Cobra drilling

April 2002

Drawing

Landsvirkjun

UC-34 through UC-42

Drill. contr.

Time of drilling April 2002 Intake lake area - West bank





5-5.2 m 40 sec.

UC - 34

0

5

Depth (m)

0-1 m <10 sec.

1-2 m <10 sec.

4-5 m 70 sec.

2-3 m 10 sec.

3-4 m 30 sec.

X: 426375.2603 Y: 389587.3788Elev.: 51.4032

5.2 m bottom, stopped inhigh resistance, easy to pull up.

UC - 37

0

5

Depth (m)

0-1 m 3 sec.

1-2 m 12 sec.

2-3 m 30 sec. 3-3.9 m 25 sec.

X: 426900.0269 Y: 390126.9699Elev.: 51.8026

4.4-4.9 m 55 sec.4.9-5.2 m 25 sec.

5.4 m bottom in high resistance,hard to pull up at the bottom.

5.2-5.4 m 40 sec.

3.9-4.4 m 70 sec. increasing resistance

3.9-4.4 m 33 sec.

UC - 40

0

5

Depth (m)

4.4-4.6 m 45 sec.

0-1 m 5 sec.

1-2 m 8 sec.

2.9-3.9 m 65 sec.

4.6-4.65 m 25 sec.

2-2.9 m 16 sec.

X: 426670.4314 Y: 390462.2758

Elev.: 51.8452

4.65 m bottom in high resistance,hard to pull up at the bottom.

UC - 35

0

5

Depth (m)

0-1 m 8 sec. Ice lens at 0.2-0.3 m.

1-2 m 20 sec.

2-2.7 m 17 sec. 2.7-3 m 15 sec.

X: 426759.2732 Y: 389942.3019Elev.: 51.7247

3-4 m 70 sec.4-4.3 m 60 sec.4.3 m bottom in high resistance,easy to pull up

3.6-3.8 m 30 sec.

UC - 38

0

5

Depth (m)

3.8-3.9 m 25 sec.

0-1 m 5 sec. Ice lens at 0.3-0.4 m.1-2 m 7 sec.

2.9-3.6 m 50 sec.

2-2.6 m 20 sec. increasing resistance.2.6-2.9 m 20 sec.

X: 426725.8876 Y: 390351.9095Elev.: 51.1918

3.9-4.15 m 70 sec.4.15 m bottom, stopped inhigh resistance,easy to pull up.

3.9-4.6 m 65 sec.

UC - 41

0

5

Depth (m)

4.6-4.9 m 40 sec.

0-0.9 m 4 sec.

0.9-1.9 m 9 sec.

2.9-3.9 m 50 sec.

4.9-5.2 m 25 sec.

1.9-2.9 m 17 sec.

X: 427139.1326 Y: 390592.8462

Elev.: 51.8372


UC - 36

0

5

Depth (m)

0-1 m 6 sec.1-2 m 10 sec.2-2.4 m 15 sec. increasing resistance.

3-3.6 m 72 sec.

X: 426364.6005 Y: 390121.2401Elev.: 51.3180

4 m bottom in high resistance,easy to pull up.

3.6-3.8 m 15 sec.

2.4-3 m 40 sec.

3.8-4 m 45 sec.

3.9-4.4 m 35 sec.

UC - 39

0

5

Depth (m)

4.4-4.5 m 33 sec.

0-1 m 10 sec.

1-2 m 10 sec.

3.4-3.9 m 40 sec.

2-2.9 m 17 sec.2.9-3.4 m 12 sec.

X: 427025.6905 Y: 390418.0175Elev.: 51.8309

4.5 m bottom, almost stop,easy to pull up.

3.9-4.2 m 40 sec.

UC - 42

0

5

Depth (m)

4.2-4.4 m 18 sec.

0-0.9 m 3 sec.

0.9-1.9 m 37 sec.

2.9-3.9 m 125 sec.

4.4-4.9 m 53 sec.

1.9-2.9 m 60 sec.

X: 427000.1879 Y: 390725.0337

Elev.: 51.4351

4.9-5.1 m 50 sec.5.1 m bottom in high resistance,hard to pull up.





y jDesign

Drawn HH

AgG/HH

Cobra drilling

April 2002

Drawing

j

UC-43 through UC-51

Drill. contr.

Time of drilling April 2002 Intake lake area - West bank



4.9-5.2 m 85 sec.4.6-4.9 m 43 sec.

5.2 m stopped in high resistance.

2-3 m 13 sec.

4.4-4.6 m 37 sec4.2-4.4 m 40 sec.3.9-4.2 m 30 sec. 3.6-3.9 m 60 sec.

Elev.: 50.8832

Y: 389239.5113X: 426420.3748

3.4-3.6 m 60 sec.3-3.4 m 20 sec.

1-2 m <10 sec.0-1 m <10 sec.

Depth (m)

5

0

UC - 49

UC - 46

0

5

Depth (m)

0-0.9 m 11 sec.

0.9-1.9 m 20 sec.1.9-2.9 m 32 sec.

3.9-4.4 m 60 sec.

X: 427827.5815 Y: 391296.9753

Elev.: 52.7001

4.4-4.9 m 92 sec.4.9-5.4 m 67 sec.5.4-5.5 m 30 sec.

2.9-3.9 m 52 sec.


UC - 43

0

5

Depth (m)

0-0.9 m 17 sec. Ice at 0.3-0.4 m.

0.9-1.9 m 24 sec.1.9-2.4 m 14 sec. 2.4-2.9 m 58 sec.

X: 427469.9506 Y: 390864.2657

Elev.: 52.5774

2.9-3.6 m 97 sec.3.6-3.9 m 53 sec.3.9-4.9 m 155 sec. 4.9-5.1 m 55 sec.5.1 m bottom in high resistance.

Sandy gravel.

Sandy gravel.

Sandy gravel.

Urriðafoss Hydroelectric ProjectDesign HH

JFS - 47

April 2002


Ti f d illi A il 2002 Intake lake area - West bank



UC - 51

0

5

Depth (m)

X: 426078.2580 Y: 388423.4247

Elev.: 50.4381

0-1 m 5 sec.1-2 m 7 sec.

3-3.6 m 20 sec. 3.6-3.95 m 32 sec.3.95-4.2 m 20 sec.4.2-4.4 m 33 sec. 4.4-4.6 m 30 sec.

5.9-6.6 m 70 sec.

2-3 m 15 sec.

4.6-4.9 m 41 sec.4.9-5.2 m 30 sec.5.2-5.4 m 30 sec. 5.4-5.6 m 20 sec.5.6-5.9 m 40 sec.

6.8 m bottom in high resistance.6.6-6.8 m 50 sec.

UC - 48

0

5

Depth (m)

0-0.9 m 8 sec.0.9-1.9 m 11 sec.1.9-2.6 m 15 sec.

2.9-3.2 m 40 sec.

X: 428444.9215 Y: 391193.7438

Elev.: 52.9286

3.2-3.4 m 20 sec.

2.6-2.9 m 35 sec.

3.4-3.6 m 15 sec.3.6-3.9 m 35 sec.

4.4-4.9 m 87 sec.4.9-5.15 m 70 sec.5.15 m bottom in high resistance,easy to pull up.

3.9-4.4 m 55 sec.

UC - 45

0

5

Depth (m)

0-0.9 m 14 sec.0.9-1.9 m 24 sec.

2.6-2.9 m 20 sec.2.9-3.6 m 77 sec.

X: 427858.1574 Y: 390986.9723

Elev.: 52.4755

3.6-3.9 m 63 sec.3.9-4.4 m 66 sec.4.4-4.9 m 60 sec.4.9-5.4 m 42 sec.

1.9-2.6 m 35 sec.

5.4-5.6 m 28 sec.5.6-5.9 m 55 sec.5.9-6.4 m 60 sec.6.4-6.6 m 60 sec.6.6 m bottom in high resistance,hard to pull up.

Sandy gravel.

Sandy gravel.

Sandy gravel.

UC - 50

0

5

Depth (m)

0-1 m 5 sec.1-2 m 15 sec.

2.9-3.9 m 75 sec. 3.9-4.2 m 30 sec.

X: 426209.8351 Y: 388716.1866

Elev.: 50.6505

4.2-4.4 m 33 sec.4.4-4.6 m 60 sec. 4.6 m bottom in high resistance.

2-2.9 m 65 sec.higher resistance at 2.6 m.

UC - 47

0

5

Depth (m)

0-0.9 m 13 sec.0.9-1.9 m 30 sec.

1.9-2.9 m 35 sec.

3.6-3.9 m 22 sec.

X: 428424.7277 Y: 390792.5867

Elev.: 53.0114

3.9-4.6 m 35 sec.

2.9-3.6 m 20 sec.

4.6-4.9 m 48 sec.


4.9-5.2 m 50 sec.

UC - 44

0

5

Depth (m)

0-0.9 m 7 sec.

0.9-1.9 m 12 sec.

1.9-2.9 m 20 sec.2.9-3.2 m 20 sec.

X: 427343.6091 Y: 391015.6449

Elev.: 51.9799

3.2-3.9 m 45 sec.3.9-4.6 m 66 sec.4.6-4.9 m 35 sec.4.9-5.2 m 25 sec.5.2-5.35 m 40 sec.5.35 m bottom in high resistance.

Sandy gravel.

Sandy gravel.

Sandy gravel.

UC - 52

0

5

Depth (m)

0-1 m 6 sec.1-1.6 m 12 sec.

1.9-2.2 m 40 sec. 2.2-2.4 m 20 sec.

X: 425854.5933 Y: 388597.1485

Elev.: 50.7573

2.4-2.9 m 72 sec.2.9-3.2 m 25 sec.


1.6-1.9 m 26 sec.

3.2-3.6 m 75 sec.3.6-3.7 m 40 sec.

Sandy gravel.

Drawn HHCobra drilling Drawing

UC-52 and UC-53

Time of drilling April 2002 Intake lake area West bank


UC - 53

0

5

Depth (m)

0-2 m 15 sec.

2-2.4 m 25 sec.

2.9-3.2 m 15 sec.

3.4-3.9 m 50 sec.

X: 425991.7033 Y: 388976.0524

Elev.: 50.4244

3.9-4.6 m 60 sec.

3.2-3.4 m 15 sec.


2.4-2.9 m 45 sec.

Sandy gravel.


Drawn HH

AgG

JFS - 47

Percussion drilling

April 2002

Drawing

Landsvirkjun

ULO - 56 through ULO - 61

Drill. contr.

Time of drillingRFSApril 2002 Intake lake area




Note: Steady pressure at 50 bars for all the drilling holes from ULO-57.

ULO - 56

0

5

Depth Coarse grained gravel 1-5 cm, sandy.

m

10

0-2.7 m low resistance.

8.7 m bottom in high resistance.hard to pull up.

2.7-5.7 m higher resistance.Only pushed down and rotation,scattered stones,pressure 40 bar.

5.7-8.7 percussion hammering used.Higher resistance, probably scoria.

X: 430611.0658 Y: 391411.5288

Elev.: 53.6982

ULO - 58

0

5

Depth Sandy gravel.

m 0-2.7 m low resistance.Only pushed down and rotation, pressure 50 bar.

5.2-5.7 m high resistance, stony.Percussion hammering used, possibly scoria.Bottom at 5.7 m.

2.7-4 m low resistance,scattered stones.4-5.2 increasing stones,low resistance in between.

X: 430255.3587 Y: 391239.3314Elev.: 53.3603

ULO - 60

0

5

Depth Sandy gravel

m 0-3.5 m low resistance.Only pushed down and rotation,pressure 50 bar.

4.2-5.0 m stony, higher resistance.3.5-4.2 m stony, low resistance.

5.0-5.7 m percussion hammering used.Probably scoria.

X: 429879.9769 Y: 391413.8608Elev.: 53.5751

ULO - 59

DepthSandy, fine grained gravel.0-3 m low resistance.Only pushed down and rotation,pressure 50 bar.

3-3.5 m higher resistance.

0

5

m

3.5-5.7 m stony material,probably a mix of scoria and gravel.Hard to pull up.No percussion hammering used.

X: 430216.3279 Y: 391375.6727Elev.: 53.7182

ULO - 61

DepthGravel0-4.5 m low resistance.Only pushed down and rotation,pressure 50 bar.

4.5-5.7 m stony, higher resistance,possibly loose scoria.

0

5

m

10

5.7-6.7 m higher resistance, probably scoria.

X: 429791.7636 Y: 391267.8128Elev.: 52.7607

6.7-8.7 m percussion hammering used,probably continuous vesicular basalt lava.

ULO - 57

DepthSandy, fine grained gravel.0-2.7 m low resistance.Only pushed down and rotation,pressure 50 bar.

2.7-4.5 scattered stones,low resistance.

0

5

m

4.5-5.7 m percussion hammering used.Higher resistance, probably scoria.5.7 m bottom in high resistance.

X: 430353.5482 Y: 391531.0872

Elev.: 54.3103


Drawn HH

AgG

JFS 47

Percussion drilling

April 2002

Drawing

Landsvirkjun


Drill. contr.




D HH

AgG

JFS - 47

April 2002






ULO - 64

0

5

Depth Sand.

m 0-3.5 m low resistance.Only pushed down and rotation,pressure is 50 bar.

3.5-3.7 m stony, low resistance.

3.7-5.7 m percussion hammering used.Probably scoria.

X: 428920.0720 Y: 390695.2344Elev.: 53.1244

ULO - 66

0

5

Depth Sandy fine gravel.

m

10

0-4.5 m low resistance.Only pushed down and rotation, pressure 50 bar.

6.2-6.8 m percussion hammering used,jerky drilling.

4.5-5.3 m low resistance,jerky drilling.

5.3-6.2 m higher resistance,jerky drilling.

X: 428445.4630 Y: 391090.8839Elev.: 52.8954

6.8-8.0 m low resistance,only pushed down and rotation.

8.0-8.7 m percussion hammering used,low resistance.Like cave at 6.8-8.0 m depth.

ULO - 67

DepthSandy, fine gravel.0-3.5 m low resistance.Only pushed down and rotation,pressure 50 bar.

3.5-4.0 m low resistance,jerky drilling.

0

5

m

4.0-5.7 m percussion hammering used,high resistance, probably scoria.

X: 428425.1206 Y: 390800.0568Elev.: 52.9735

ULO - 65

DepthSandy fine gravel.0-2.7 m low resistance.Only pushed down and rotation,pressure 50 bar.

3.5-4.0 m jerky, higher resistance.

0

5

m

4.0-5.7 m percussion hammering used.Higher resistance, probably scoria.Jerky drilling, hard to pull up.

X: 428915.4162 Y: 391179.0806Elev.: 53.1355

2.7-3.5 m low resistance, jerky.

ULO - 63


3.5-4.2 m higher resistance.

0

5

m

4.2-5.7 m percussion hammering used,jerky drilling, probably scoria.Hard to pull up.

X: 429254.9776 Y: 390879.1020Elev.: 52.5539

ULO - 62

0

5

Depth Sandy gravel.

m

10


6.5-7.2 m percussion hammering used, high resistance, jerky drilling.

4.5-5.7 m low resistance,scattered stones.

5.7-6.5 m high resistance,stony.

X: 429485.8937 Y: 391188.8957Elev.: 53.0903

7.2-7.9 m probably basalt lava.

Drawn HHPercussion drilling Drawing


Time of drilling April 2002


Drawn HH

AgG

JFS - 47

Percussion drilling

April 2002

Drawing

Landsvirkjun

ULO 74 and ULO 75

Drill. contr.




ULO - 69

DepthSandy fine gravel.

0-4 m low resistance.Only pushed down and rotation,pressure 50 bar.

0

5

m

5.0-5.7 m percussion hammering used.Higher resistance, probably scoriapacked with sand.Jerky drilling, hard to pull up.

X: 427859.2803 Y: 390987.9983

ULO - 68

0

5

Depth Sand.

m 0-5.5 m low resistance.Only pushed down and rotation,pressure is 50 bar.

5.5-5.7 m jerky drilling, possibly scoria.5.7-6.3 m percussion hammering used.Probably solid lava, stopped in hard rock.

X: 428143.2769 Y: 391141.8602Elev.: 52.9845 Elev.: 52.5759

ULO - 71


5.9-7.0 m slowly increasing resistance.

0

5

m

10

7.0-8.7 m percussion hammering used,low resistance, probably scoria.

X: 427503.5281 Y: 390883.0293

ULO - 70

0

5


m0-5.0 m low resistance.Only pushed down and rotation, pressure 50 bar.

5.0-5.7 m low resistance,jerky drilling, easy to pull up.

X: 427641.4265 Y: 391118.2743Elev.: 52.7720 Elev.: 52.4558

4.0-5.0 m higher resistance, jerky.

8.7-9.5 m percussion hammering not used,low resistance.

10.7-11.1 m high resistance,massive layer.

9.5-10.7 m percussion hammering used,low resistance.

ULO - 73

DepthSandy fine gravel.

0-2.7 m low resistance.Only pushed down and rotation,pressure 50 bar.

0

5

m

10

4.0-5.7 m percussion hammering used in 2 short intervals but otherwise only pushed down and rotation.

X: 426891.4292 Y: 390109.1326

ULO - 72

0

5


m

10

0-2.7 m low resistance.Only pushed down and rotation,pressure is 50 bar.


7.5-8.7 m low resistance,jerky drilling.Easy to pull up.No percussion used.

X: 426832.7234 Y: 390561.7673Elev.: 51.6293 Elev.: 51.9341

2.7-4.0 m little higher resistance.

5.7-7.5 m low resistance.Only pushed down and rotation,pressure 50 bar.7.5-8.7 m percussion hammer used,massive layer, scoria or basalt lava.

Note: Steady pressure at 50 bars for all the drilling holes from ULO-57.Note: Steady pressure at 50 bars for all the drilling holes from ULO-57.

ULO - 74 and ULO - 75


Drawn WaF

WaF

JFS - 47

Percussion drilling

Jun. 2001

Drawing

Landsvirkjun

ULO - 2 and ULO - 3

Drill. contr.

Time of drillingRFSJun. 2001 Dam area



ULO - 75



0

5

m

10

15

8.7-9.0 m higher resistance, jerky drilling.

X: 426420.3825 Y: 389242.8960

ULO - 74

0

5


m

10


8.1-8.7 m higher resistancebut only pushed down and rotation.

X: 426321.4709 Y: 389858.7377Elev.: 51.4060 Elev.: 50.9233

9.0-11.4 m percussion hammering used in thin hard layers, low resistance in between only pushed down and rotation.11.4-11.7 m percussion used,probably soft basalt lava,easy to pull up.


Urriðafoss Hydroelectric Project - Landsvirkjun · 2013-03-04 · Jarðfræðistofan ehf 2002 3...

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Transcript of Urriðafoss Hydroelectric Project - Landsvirkjun · 2013-03-04 · Jarðfræðistofan ehf 2002 3...