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TANBREZ MINING GREENLAND A/S TANBREEZ PROJECT CLIMATE AND HYDROLOGY AUGUST 2013 Orbicon A/S Ringstedvej 20 DK 4000 Roskilde Denmark Phone + 45 46 30 03 10 Version Draft 1.2 Date 6. August 2013 Prepared OSMI

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Page 1: TANBREEZ PROJECT CLIMATE AND HYDROLOGYtanbreez.com/media/1463/6b1 - Climate and Hydrology - August 201… · TANBREEZ PROJECT CLIMATE AND HYDROLOGY AUGUST 2013 Orbicon A/S Ringstedvej

TANBREZ MINING GREENLAND A/S

TANBREEZ PROJECT

CLIMATE AND HYDROLOGY

AUGUST 2013

Orbicon A/S

Ringstedvej 20

DK 4000 Roskilde

Denmark

Phone + 45 46 30 03 10

Version Draft 1.2

Date 6. August 2013

Prepared OSMI

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 2/32

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 3/32

TANBREZ MINING GREENLAND A/S

TANBREEZ PROJECT

ENVIRONMENTAL IMPACT ASSESSMENT

August 2013

Orbicon A/S

Ringstedvej 20

DK 4000 Roskilde

Denmark

Phone + 45 46 30 03 10

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 4/32

TABLE OF CONTENTS

1 INTRODUCTION ................................................................................................................. 6

2 Kilavaat Anlinnguat area ................................................................................................... 7

3 CLIMATIC CONDITIONS IN THE REGION ........................................................................ 8

3.1 INTRODUCTION ................................................................................................................. 8

3.2 Precipitation ....................................................................................................................... 8

3.3 Wind pattern ....................................................................................................................... 9

3.4 Fog .....................................................................................................................................10

4 Weather data collected at Killavaat Alannguat .............................................................11

5 CATCHMENT AREAS at KILLAVAAT ALANNGUAT .....................................................15

6 THE HYDROMETRIC STATION AT FOSTERSØ ............................................................17

6.1 Discharge in 2010-2011 ...................................................................................................19

6.2 Long term discharge .......................................................................................................20

7 OVERALL WATER BALANCE .........................................................................................22

7.1 Conclusion of hydrological calculations .......................................................................23

8 REFERENCES ..................................................................................................................24

ANNEX 1 DISCHARGE DATA FROM FOSTERSØ ...........................................................................25

ANNEX 2 MEASURED AIR TEMPERATURE AT KILLAVAAT ALIANNGUT ..................................27

ANNEX 3 MEASURED WIND SPEED AT KILLAVAAT ALIANNGUAT...........................................28

ANNEX 4 MEASURED RELATIVE HUMIDITY AT KILLAVAAT ALIANNGUAT .............................29

ANNEX 5 MEASURED PRECIPITATION AT KILLAVAAT ALIANNGUAT......................................30

accumulated daily total ...................................................................................................................30

ANNEX 6 MEASURED WIND DIRECTION DATA AT Killavaat Aliannguat ...................................31

hourly average values .....................................................................................................................31

ANNEX 7 MEASURED WIND CLASS FREQUENCY AT KILLAVAAT ALIANNGUAT ...................32

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 5/32

List of figures

Figure 2-1 The location of the TANBREEZ Project in South Greenland. ....................................... 7 Figure 3-1 Windroses from Qaqortoq and Narsarsuaq ................................................................... 9 Figure 4-1 The weather station at Killavaat Alannguat .................................................................11 Figure 4-2 Monthly precipitation recorded at Killavaat Alannguat (St. 1004 – Mine Site)

and in Qaqortoq. ...........................................................................................................13 Figure 4-3 Measured temperature at Killavaat Alannguat (St. 1004 – Mine Site) and in

Qaqortoq. ......................................................................................................................13 Figure 5-1 Streams, rivers (blue lines) and lakes and their catchment areas (red lines)

at Killavaat Alannguat. Fostersø (Foster Lake) is marked with “470” in the

figure (the altitude of the lake). .....................................................................................15 Figure 6-1 Hydrometric station at Fostersø. ..................................................................................17 Figure 6-2 Rating curve for Fostersø (see text for explanation). ..................................................18 Figure 6-3 Measured water level in Fostersø (top), calculated outflow from Fostersø

(middle) and measured air temperature (bottom) June 2010 – October 2011. ............19 Figure 6-4 Correlation between the measured annual discharge from Lake Taseq in

1982-1991 and the recorded precipitation in Qaqortoq during the same

period. ...........................................................................................................................21 Figure 7-1 Catchment areas and locations for discharge measurements(red figures) .................22

List of Tables

Table 4-1 Summary of climate data from Killavaat Alannguat measured between May

2010 and October 2011. ...............................................................................................12 Table 6-1 Estimated annual average, minimum and maximum discharge of Fostersø ..............20 Table 6-2 Measured annual discharge from Fostersø in 2010-2011 and estimated

long-term annual discharge. .........................................................................................21 Table 7-1 Characteristics of key water courses in the project area. ...........................................23

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 6/32

1 INTRODUCTION

TANBREEZ Mining Greenland A/S is currently exploring the potential of mining

Zirconia, Rare Earth Elements, Yttrium, Niobium, Hafnium and Tantalum mine (the

TANBREEZ Project) at Killavaat Alannguat (Kringlerne) in South Greenland.

The TANBREEZ Project includes two mine sites; one at the Killavaat Alannguat plateau

at 400 – 500 m altitude and another at the shore of Kangerluarsuk Fjord where all other

mine facilities will be located.

Fostersø, which is also situated at Killavaat Alannguat, has been identified as a possible

location for deposition of tailings and waste rock. Fostersø is connected to

Kangerluarsuk Fjord through the stream Laksetværelv which discharge into Lakseelv

approximately 1 km from outlet in the fjord.

In order to better characterise the actual climate at the mine site a weather station has

been operated by Orbicon since May 2010. This note present the climate data collected

between May 2010 and October 2011.

To get a better understanding of the hydrology of the Killavaat Alannguat, and in

particular the flow in streams and rivers that connect Fostersø with the fjord, Orbicon

has been operating a hydrometric station that measure the out flow of water from

Fostersø. This station has also been running since May 2010 and the data compiled so

far is presented in this note.

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1530

1460

1880

827

3221760

877

1910

1530

1730

13401473

1390

650

1410

1354

840

1757

456

420847

5931070

680

1387

797

640

537

464

587

1059

689

23

170

1286

541

573

392

352

194

Narsarsuaq

TANBREEZ

Narsaq

Qaqortoq

2 KILAVAAT ANLINNGUAT AREA

Kilavaat Anginnguat is situated in South Greenland at 60052’N, 45

049’W (Figure 2.1)

20 km NE of the town Qaqortoq, 40 km SW of the airport and community Narssarsuaq

and 10 km SE of the town Narsaq.

Figure 2-1 Location of the TANBREEZ Project in South Greenland

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3 CLIMATIC CONDITIONS IN THE REGION

3.1 INTRODUCTION

South Greenland is situated at latitude 600-61

0 North and is characterized by having

arctic climate as the warmest month in the year has average temperatures below +100

Celsius.

At a regional scale the weather in South Greenland is mainly influenced by the North

American continent and the North Atlantic Ocean. But the local climate is also heavily

influenced by the Greenland Inland Ice. Another key factor is the all year round low sea

surface temperature which is causing the South Greenland waters and coasts to be part

of the arctic zone with summer temperatures below 10 degree C.

The annual average air temperature at Qaqortoq is 0.60C (Source DMI: standard period

1961-1990) some 20 km southwest of Killavaat Alannguat. Qaqortoq is situated close to

the open coast and is under influence by an oceanic weather type with cool summers

and relatively mild summers. The average January temperature in Qaqortoq is – 5.5

degree C, while the average temperature in the warmest months (July and August) is

7.2 degree C (DMI 2012).

Further inland, the weather type is more of a continental type and in South Greenland

average summer temperatures can locally exceed the 10 degree threshold, which limit

the arctic region. For example is the annual average air temperature at Narsarsuaq, 35

km northeast of Killavaat Alannguat 0.9 0C, the average January temperature is – 6.8

degree C, but 10.3 degree C in July (DMI 2012).

3.2 Precipitation

The annual average precipitation is measured to 615 mm at Narsarsuaq and 858 mm at

Qaqortoq. This reflects the fact that the Narsarsuaq is dominated by continental and dry

climate compared to the more humid air from the ocean at Qaqortoq.

The highest monthly precipitation was measured to 374 mm in July 1966 in Qaqortoq.

Local variations will occur as a consequence of changing topography affecting more

rain in the high altitudes due to the orographic effect when humid air is forced up the

mountain sides.

In the winter period where precipitation is falling as snow, the snow depth is typically

highest in February where the normal is 20 cm in Narsarsuaq and 41 cm in Qaqortoq.

The absolute maximum snow depth in Narsarsuaq was measured to 103 cm in 1973

and in Qaqortoq 204 cm measured in 1972.

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3.3 Wind pattern

Gale force winds (above 13.8 m/s) are common in South Greenland in particular in

winter. Furthermore, down directed offshore winds may reach sea level as outbursts of

dry and relatively warm air (a foehn wind). This is a warm dry wind arising through

adiabatic compression of the air sweeping down from the inland ice cap. Its relative

humidity drops to 30-40% and the temperatures rises up to 15-20 degrees C within an

hour and remains very high for up to a day or two. The effect of the foehn wind is

particularly marked in winter, when it results in rapid melting of the snow.

The wind pattern in the region is much dependent of local variations in topography,

even though the general atmosferic circulation is the driving force and determine

whether the wind is coming from the costal region or perhaps from the caractheristic

Föhn situations with strong gales coming from the NE.

Both at Qaqortoq and Narsarsuaq is the prevailing wind direction NE or the opposite

direction SW. Figure 3-1. Characteristic is that Qaqortoq is exposed for a much more

differing wind pattern than Narsarsuaq who is very dominated by the orientation of the

Narsarsuaq Valley

Wind of character of storm or higher is mostly occuring from NE and is often of

character of katabatic winds like the dry and warm Föhn winds.

DMI station Qaqortoq 1961 – 1999 DMI station Narsarsuaq 1961 – 1999

Figure 3-1 Windroses from Qaqortoq and Narsarsuaq

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On average the wind is less than 1.5 m/s or zero in 44% of the year at Narsarsuaq,

compared to 41% at Qaqortoq.

The frequency of storms counted as number of days a year with winds higher than 28.5

m/s, is 1.3 at Narsarsuaq and 2.7 at Qaqortoq.

3.4 Fog

Even though the weather often is clear with excellent visibility, there are also periods

with fog. The sea fog season is from May to September where relatively cold sea water

is cooling the passing air masses with condensation and advection fog as a result.

The sea fog is more frequent in Qaqortoq and decreasing when moving towards East,

more inland and closer to the ice sheet. Number of days with fog and visibility less than

1 km is 18 days in Narsarsuaq and 53 days a year in Qaqortoq.

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4 WEATHER DATA COLLECTED AT KILLAVAAT ALANNGUAT

The weather station at Killavaat Alannguat since 23 May 2010 (Figure 4.1) has collected

information on wind speed and direction, temperature, barometric pressure humidity

and precipitation. The collected data are shown in Annex 2 – 7. A summary of the

collected data are presented in Table 4-1.

Figure 4-1 The weather station at Killavaat Alannguat

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Air Temperature Humidity Wind speed Precipitation

Meas. Seqence 1. hour 1. Hour 1. Hour avg 1 hour max 10. min avg

Period value Avg Min Max Avg Avg Max Max Total

Year/Month Co Co Co % m/s m/s m/s mm

1 - - - - - - - -

2 - - - - - - - -

3 - - - - - - - -

4 - - - - - - - -

5 9.3 1.8 15.7 47 4.6 29.1 27.4 -

6 8.5 1.9 17.0 70 2.9 28.3 20.7 65

7 9.0 2.9 17.1 77 2.6 27.0 21.4 80

8 10.1 4.4 18.0 84 2.3 25.8 17.9 174

9 7.2 0.2 17.0 68 3.4 52.4 30.4 98

10 3.1 -6.9 13.2 64 4.6 52.1 31.7 51

11 0.8 -6.0 9.6 60 5.9 43.9 30.9 125

12 1.1 -9.2 10.8 60 3.2 39.1 32.1 100

2010 5.8 -9.2 18.0 68 3.6 52.4 32.1 691

1 -4.6 -15.9 7.5 60 3.1 26.2 20.1 71

2 -7.0 -16.4 4.7 66 5.0 41.0 22.7 71

3 -7.0 -21.0 8.8 60 4.9 33.7 27.1 40

4 -6.8 -16.8 0.8 66 3.5 20.7 16.7 48

5 0.1 -4.6 7.6 74 2.3 15.9 12.3 66

6 6.3 -3.1 15.4 69 2.8 36.0 23.3 17

7 9.7 3.3 16.6 68 2.7 27.5 18.3 64

8 8.0 1.4 17.0 76 2.5 33.4 21.1 122

9 4.5 -3.4 10.7 64 2.4 35.0 23.6 72

10 -1.8 -8.4 7.1 60 2.2 32.3 24.1 43

11 - - - - - - - -

12 - - - - - - - -

2011 0.2 -21.0 17.0 66 3.1 41.0 27.1 614

Table 4-1 Summary of climate data from Killavaat Alannguat measured between May 2010 and October 2011

The weather regime in the Killavaat Alannguat area takes an intermediate position

between Qaqortoq and Narsarsuaq. This means that Killavaat Alannguat lies within the

Arctic climate zone, with cool summers and cold winters.

The annual precipitation from November 2010 to October 2011 at Killavaat Alannguat

was 840 mm while only 660 mm was recorded in Qaqortoq during the same period. The

monthly precipitation recorded at these two sites is shown in Figure 4-2. This higher

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precipitation measured at Killavaat Alannguat compared to Qaqortoq is most likely due

to the fact that the station at Killavaat Alannguat is at 450 m altitude while the weather

station at Qaqortoq is at 100m. A 5% increase in precipitation for every 100 altitude is

often recorded in coastal Greenland.

0

20

40

60

80

100

120

140P

reci

pit

atio

n (

mm

)

St. 1004 - Mine Site

Qaqortoq

Figure 4-2 Monthly precipitation recorded at Killavaat Alannguat (St. 1004 – Mine Site) and in Qaqortoq

-8

-6

-4

-2

0

2

4

6

8

10

12

Air

te

mp

era

ture

(C0)

St. 1004 - Mine Site

Qaqortoq

Figure 4-3 Measured temperature at Killavaat Alannguat (St. 1004 – Mine Site) and in Qaqortoq

The temperature at Killavaat Alannguat during the summer months is almost similar to

Qaqortoq, while in the winter months the temperature is much lower at Killavaat

Alannguat (Figure 4-3). This is probably a combination of the more coastal climate at

Qaqortoq and the 350 m difference in altitude.

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Very high wind speeds have also been recorded at Killavaat Alannguat with a

maximum wind speed of 52.4 m/s in September 2010 but many incidences with wind

speed over 30 m/s (Annex 3).

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5 CATCHMENT AREAS AT KILLAVAAT ALANNGUAT

Streams, rivers and lakes at Killavaat Alannguat with their catchment areas are shown

in Figure 5.1. The topography and morphology of this area varied considerably and

include the steep and very significant 1200 meter high mountain ridge “Redekammen”,

which forms the catchment boundary towards the South-east. Most of the area that

surrounds Fostersø is an elevated plateau with almost no vegetation. This is in contrast

to the lower and downstream Lakseelv-valley, which has dense vegetation of dwarf heat

and grasses.

Hydrology station

Climate station

Figure 5-1 Streams, rivers (blue lines) and lakes and their catchment areas (red lines) at Killavaat Alannguat. Fostersø (Foster Lake) is marked with “470” in the figure (the altitude of the lake)

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The small stream Laksetværelv is the outlet of Fostersø. This stream has steep gradient

resulting in a turbulent character with many small waterfalls. Laksetværelv joins

Lakseelv about 1 km before the fjord.

Lakseelv has a total catchment area of 26 km2. Laksetværelv and its sub-catchment

areas which cover 6.4 km2 make up 25% of this area.

The runoff pattern in the area varies according to the vegetation cover, soil layer

thickness and topography. Typically an increase in water flow is recorded very shortly

after precipitation events, even though Fostersø acts as a buffer and delays the flow to

some extent. This is particularly obvious in the dry periods of the summer.

A base flow or contribution from soil and ground water storage is usually not very

important in cold region such as South Greenland. However, some base flow of soil

and/or ground water must take place since water is flowing in Lakseelv throughout the

year (that is even during mid-winter).

Laksetværelv

Laksetværelv

_

Lakseelv with confluence from Laksetværelv

_

Lakseelv and Valley upstream Laksetværelv

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6 THE HYDROMETRIC STATION AT FOSTERSØ

If Fostersø is to be used as tailings pond and for deposition of waste rock, it is important

to known the retention time of water in the lake. To calculate this, a key figure is annual

discharge but also annual variation, minimum flow and maximum flow is necessarily

information.

A hydrometric station has therefore been running at the outlet of Foster Lake since May

2010 (Figure 6.1).

Figure 6-1 Hydrometric station at Fostersø

This hydrometric station measures and store information about the water level in

Fostersø. Based on the relation between the recorded water levels and a series of

discrete discharge measurements it is possible to estimate the relation between these

parameters and thereby calculate a continuous time series of discharge data.

The hydrometric station has been operated with a Campbell Scientific data logger,

measuring the water level through a submerged pressure transducer. The data logger is

powered by a 12 volt accumulator and a 10 Watt solar panel. Data transmission is

provided by the Iridium satellite system.

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As a backup, a standalone submerged mini-data logger is deployed in the Fostersø

approximately 50 meter north of the main station. Data from this station has not yet

been collected.

The rating curve expresses the relation between the water level in the lake (H) and the

discharge (Q) and is dependent on the hydraulic conditions at the outlet from the lake.

The rating curve for Fostersø is shown in Figure 6.2.

Wate

r le

vel m

datu

m

99.70

99.72

99.74

99.76

99.78

99.80

99.82

99.84

99.86

99.88

99.90

99.92

99.94

99.96

99.98

100.00

Flow m3/s

0.0 0.1 0.2 0.3

Figure 6-2 Rating curve for Fostersø (see text for explanation)

The rating curve makes it possible to construct a time series of discharge values

derived from the continuously recorded water level in the lake. Figure 6.3 (top) show the

measured water level in Fostersø between June 2010 and October 2011. The middle

figure shows the estimated outflow from the lake (through Laksetværelv) in the same

period. The bottom figure show the measured air temperature during the same period

as measured at the nearby climate station.

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 19/32

LT

EM

P [C

]

-20

-10

-0

10

20

jul

2010

sep

2010

nov

2010

jan

2011

mar

2011

maj

2011

jul

2011

sep

2011

nov

2011

jan

2012

mar

2012

maj

2012

jul

2012

sep

2012

Privat DDH : 1004 Killavaat Aliannguat, Minesite

1004 [ 1] [LTEMP] [EDT] [Øje] [MI]

VN

F [m

3/s

]

0.0

0.2

0.4

0.6

jul

2010

sep

2010

nov

2010

jan

2011

mar

2011

maj

2011

jul

2011

sep

2011

nov

2011

jan

2012

mar

2012

maj

2012

jul

2012

sep

2012

Privat DDH : 1003 Killavaat Aliannguat, Foster sø, outlet

1003 [ 1] [VNF] [EDT] [Mid] [DD] 1003 [ 1] [VNF] [VIR] [Øje] [MI]

VS

T [m

Level]

99.8

100.0

100.2

jul

2010

sep

2010

nov

2010

jan

2011

mar

2011

maj

2011

jul

2011

sep

2011

nov

2011

jan

2012

mar

2012

maj

2012

jul

2012

sep

2012

Privat DDH : 1003 Killavaat Aliannguat, Foster sø, outlet

1003 [ 1] [VST] [EDT] [Øje] [SS] 1003 [ 1] [VST] [VIR] [Øje] [MI]

Figure 6-3 Measured water level in Fostersø (top), calculated outflow from Fostersø (middle) and measured air temperature (bottom) June 2010 – September 2012

It is clear from curve in Figure 6.3 (top) that the water level is changing with the rain

events and snow melt. However, from mid-January to end of March the water level was

steadily increasing in the lake. This is because the outflow was blocked by ice but a

steady inflow of water still took place, probably mostly ground/soil water, leading to an

increase in the level.

When the first strong thaw/rain event occurs by the end of March the blockage melted

and the water from the lake is forced out through Laksetværelv (Figure 6.3, top and

middle).

6.1 Discharge in 2010-2011

The calculated discharge data (in Figure 6.3 middle) makes it possible to calculate the

annual outflow from Fostersø during a full year (October 2010-September 2011). This,

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 20/32

combined with data on precipitation in the region, makes it further possible to assess if

the calculated data from 2010-2011are typical, or perhaps reflects a particularly dry or

wet year (see Section 6.2).

St. No. Name Year

Annual

Average

(m3/s)

Annual

Min

(m3/s)

Annual Max

(m3/s)

1003 Foster Lake Oct 2010-Sept 2011 0.08 0 0.6*

Table 6-1 Estimated annual average, minimum and maximum discharge of Fostersø

* The calculated max. discharge at 0.6 m3/s originates from the melt of the ice blockage at the outlet in end

March 2011. The calculated ice free maximum discharge is 0.3 m3/s, measured the 8. June 2011.

6.2 Long term discharge

The discharge data in Section 6.1 is based on a single year’s data. To assess if the

calculated data from 2010-2011 are typical, or perhaps reflects a particularly dry or wet

year, longer series of discharge series are required. One such data series exists from

Lake Taseq close to Narsaq and some 12 km from Fostersø. Here data were collected

from 1982 to 1991. These data were compared with precipitation data from Qaqortoq

from the same period and a statistic significant correlation was found (Figure 6.4). It can

further be calculated that that Taseq has a specific discharge of 42 m3/second/km

2 of

catchment area.

Assuming that the catchment areas of Taseq and Fostersø are comparable as they are

both pure precipitation driven without any glacial ablation contribution, the main

difference in their discharge is the size of the catchment area (Taseq is 7.4 km2 while

the catchment area of Fostersø is 3.4 km2).

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 21/32

y = 0.4336x - 91.618R² = 0.8873

0

100

200

300

400

500

600

300 500 700 900 1100 1300 1500

An

nu

al a

vera

ge d

isch

arge

st.

43

1 (l

/s)

Annual Precipitation Qaqortoq (mm)

Figure 6-4 Correlation between the measured annual discharge from Lake Taseq in 1982-1991 and the recorded precipitation in Qaqortoq during the same period

Taking this into account, and using a specific discharge of 42 m3/second/km

2 of

catchment area, the long term annual discharge from Fostersø can be calculated to

0.15 m3/s (Table 6-2). This value is considerably higher than the 0.08 m

3/s measured in

2010/2011. The difference is most likely due to the measuring period in 2010-2011 was

unusually dry.

Name Annual average in

2010-2011

(m3/s)

Annual average long term discharge

(m3/s)

Measured Model Average

year

Max year Min. year

Fostersø 0.08 0.09 0.15 0.24 0,02

Table 6-2 Measured annual discharge from Fostersø in 2010-2011 and estimated long-term annual discharge.

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 22/32

7 OVERALL WATER BALANCE

Based on the estimates of the long term specific runoff from Foster Lake it is possible to

calculate the discharge from other adjacent catchments based on the assumption that

they represent the same specific runoff.

In May 2010 the flow in all streams and rivers in the Project were measured within a few

days and in a steady discharge situation. The location of each measurement site is

shown in Figure 7.1. The objective was to estimate the discharge distribution from the

sub-catchments in the area and by this improve the knowledge about the quantitative

contribution of water from Laksetværelv and Foster Lake to the recipient Lakseelv.

C

B

DE

GA

F

Klimastation

Hydrometristation

0 0.6264

kilometer

Figure 7-1 Catchment areas and locations for discharge measurements (red figures)

Table 7-1 summarizes the estimated discharge of key watercourses in the Project area

based on the measurement campaign in May 2010. From the table it can be calculated

that the discharge from Fostersø contribute with c. 20% of the water in Lakseelv at its

outlet to the fjord. In addition a further 5% is added from catchment areas downstream

Fostersø, so that 25% of the water in Lakseelv at the outlet comes from Laksetværelv.

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 23/32

A. Calculated B. Measured or B/A

annual mean Calculated

River Name Location Catchment* discharge ** May 2010

system area km2 l/s l/s

A Lakse elv 100 meter us Laksetværelv 19.6 821 280 0.34

B Laksetværelv outlet Foster Lake 3.4 141 65 0.46

C Tributary river from north west 0.9 37 10 0.27

D Laksetværelv us confluence from Månesø 4.2 178 79 0.44

E Månesø river ds Månesø 0.9 37 10 0.27

F Laksetværelv us delta 6.4 270 112 0.42

G Lakseelv ds Laksetværelv 26.0 1091 392 0.36

Table 7-1 Characteristics of key water courses in the project area

* Catchments area is derived from the 1:250.000 topographical maps.

** Based on specific runoff 42 l/s/km2 and catchment area.

7.1 Conclusion of hydrological calculations

The annual average discharge at the outlet of Fostersø is 0.15 m3/s or

estimated as runoff 42 l/s/km2 catchment area.

On average Fostersø contribute annually with 20% of the water in Lakseelv.

In addition further 5% is added from the catchment downstream, which in total

is similar to 25% of water from Laksetværelv to Lakseelv.

In winter situations with prolonged periods with frost, Fostersø is stopping

feeding water to Laksetværelv.

Intermediate thaw periods can cause sudden floods from Laksetværelv to

Lakseelv. This was recorded in the measurement period 2010-2011

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 24/32

8 REFERENCES

Danish Meteorological Institute 2001.Technical Report 00-18. The observed climate of

Greenland 1598-99.

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 25/32

ANNEX 1 DISCHARGE DATA FROM FOSTERSØ

m3/s 2010

Day JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

1 * * * * * 0.06 0.06 0.09 0.14 0.07 0.04 0.09

2 * * * * * 0.06 0.06 0.09 0.13 0.07 0.04 0.08

3 * * * * * 0.06 0.06 0.09 0.11 0.07 0.04 0.08

4 * * * * * 0.06 0.06 0.09 0.10 0.07 0.04 0.07

5 * * * * * 0.06 0.06 0.10 0.10 0.06 0.04 0.07

6 * * * * * 0.06 0.06 0.09 0.09 0.06 0.05 0.07

7 * * * * * 0.06 0.05 0.09 0.09 0.05 0.06 0.06

8 * * * * * 0.06 0.05 0.12 0.09 0.06 0.06 0.07

9 * * * * * 0.07 0.05 0.15 0.08 0.07 0.05 0.09

10 * * * * * 0.07 0.05 0.17 0.08 0.05 0.05 0.10

11 * * * * * 0.07 0.05 0.18 0.07 0.05 0.05 0.15

12 * * * * * 0.07 0.05 0.20 0.07 0.05 0.05 0.16

13 * * * * * 0.08 0.04 0.19 0.06 0.04 0.05 0.15

14 * * * * * 0.07 0.04 0.18 0.06 0.06 0.05 0.12

15 * * * * * 0.08 0.04 0.16 0.07 0.06 0.05 0.11

16 * * * * * 0.07 0.06 0.14 0.08 0.06 0.05 0.10

17 * * * * * 0.07 0.05 0.13 0.08 0.06 0.05 0.09

18 * * * * * 0.07 0.05 0.12 0.08 0.06 0.04 0.09

19 * * * * * 0.08 0.05 0.11 0.07 0.06 0.04 0.08

20 * * * * * 0.08 0.04 0.10 0.07 0.06 0.04 0.08

21 * * * * * 0.08 0.04 0.10 0.07 0.07 0.04 0.07

22 * * * * * 0.08 0.05 0.09 0.07 0.06 0.07 0.08

23 * * * * * 0.08 0.06 0.09 0.07 0.06 0.06 0.07

24 * * * * * 0.08 0.06 0.09 0.07 0.06 0.05 0.07

25 * * * * * 0.08 0.06 0.09 0.08 0.05 0.05 0.06

26 * * * * * 0.08 0.06 0.09 0.07 0.04 0.04 0.06

27 * * * * * 0.07 0.06 0.08 0.07 0.05 0.04 0.06

28 * * * * * 0.07 0.06 0.09 0.07 0.05 0.04 0.05

29 * * * * 0.07 0.05 0.12 0.08 0.05 0.05 0.06

30 * * * 0.06 0.07 0.07 0.14 0.08 0.05 0.07 0.08

31 * * 0.06 0.09 0.14 0.05 0.08

Max * * * * 0.06 0.08 0.09 0.20 0.14 0.07 0.07 0.16

Min * * * * 0.06 0.06 0.04 0.08 0.06 0.04 0.04 0.05

Avg * * * * 0.06 0.07 0.05 0.12 0.08 0.06 0.05 0.09

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 26/32

m3/s 2011

Day JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

1 0.08 0.00 0.00 0.18 0.07 0.10 0.19 0.09 0.14 0.06 * *

2 0.07 0.00 0.00 0.15 0.07 0.10 0.18 0.08 0.12 0.06 * *

3 0.07 0.00 0.00 0.13 0.07 0.10 0.17 0.08 0.11 0.06 * *

4 0.06 0.00 0.00 0.12 0.07 0.10 0.16 0.07 0.13 0.06 * *

5 0.06 0.00 0.00 0.11 0.07 0.13 0.16 0.07 0.15 0.06 * *

6 0.06 0.00 0.00 0.10 0.07 0.20 0.15 0.06 0.15 0.05 * *

7 0.05 0.00 0.00 0.12 0.07 0.30 0.14 0.06 0.14 0.05 * *

8 0.05 0.00 0.00 0.12 0.07 0.35 0.13 0.06 0.13 0.06 * *

9 0.05 0.00 0.00 0.12 0.07 0.31 0.14 0.06 0.14 0.05 * *

10 0.05 0.00 0.00 0.12 0.07 0.29 0.14 0.06 0.13 0.05 * *

11 0.03 0.00 0.00 0.11 0.08 0.27 0.13 0.05 0.12 0.05 * *

12 0.02 0.00 0.00 0.11 0.08 0.27 0.12 0.05 0.11 0.05 * *

13 0.00 0.00 0.00 0.11 0.09 0.26 0.12 0.05 0.10 0.05 * *

14 0.00 0.00 0.00 0.10 0.10 0.24 0.11 0.05 0.10 0.04 * *

15 0.00 0.00 0.00 0.10 0.10 0.23 0.11 0.05 0.12 0.04 * *

16 0.00 0.00 0.00 0.09 0.10 0.23 0.10 0.05 0.12 0.04 * *

17 0.00 0.00 0.00 0.09 0.10 0.23 0.10 0.05 0.11 0.04 * *

18 0.00 0.00 0.00 0.08 0.10 0.22 0.09 0.04 0.10 0.04 * *

19 0.00 0.00 0.00 0.08 0.09 0.21 0.10 0.03 0.09 0.05 * *

20 0.00 0.00 0.00 0.08 0.09 0.21 0.10 0.03 0.09 0.06 * *

21 0.00 0.00 0.00 0.08 0.09 0.21 0.10 0.03 0.09 0.06 * *

22 0.00 0.00 0.00 0.08 0.09 0.20 0.11 0.03 0.08 0.05 * *

23 0.00 0.00 0.00 0.07 0.09 0.20 0.12 0.03 0.08 0.05 * *

24 0.00 0.00 0.00 0.07 0.08 0.19 0.13 0.03 0.08 0.05 * *

25 0.00 0.00 0.00 0.07 0.10 0.19 0.13 0.04 0.07 0.04 * *

26 0.00 0.00 0.00 0.07 0.13 0.18 0.13 0.05 0.07 0.04 * *

27 0.00 0.00 0.00 0.08 0.15 0.17 0.12 0.13 0.07 0.04 * *

28 0.00 0.00 0.00 0.08 0.13 0.19 0.11 0.17 0.07 0.04 * *

29 0.00 0.64 0.08 0.11 0.20 0.11 0.22 0.06 0.04 * *

30 0.00 0.32 0.07 0.11 0.19 0.10 0.20 0.06 0.04 * *

31 0.00 0.23 0.10 0.09 0.16 * *

Max 0.08 0.00 0.64 0.18 0.15 0.35 0.19 0.22 0.15 0.06 * *

Min 0.00 0.00 0.00 0.07 0.07 0.10 0.09 0.03 0.06 0.04 * *

Avg 0.02 0.00 0.04 0.10 0.09 0.21 0.13 0.07 0.10 0.05 * *

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 27/32

ANNEX 2 MEASURED AIR TEMPERATURE AT KILLAVAAT ALIANNGUT LT

EM

P [C

]

-20

-15

-10

-5

-0

5

10

15

20

jun

2010

jul

2010

aug

2010

sep

2010

okt

2010

nov

2010

dec

2010

jan

2011

feb

2011

mar

2011

apr

2011

maj

2011

jun

2011

jul

2011

aug

2011

sep

2011

okt

2011

Privat DDH : 1004 Killavaat Aliannguat, Minesite

1004 [ 1] [LTEMP] [EDT] [Øje] [MI]

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 28/32

ANNEX 3 MEASURED WIND SPEED AT KILLAVAAT ALIANNGUAT V

-Hast [m

/s]

0

5

10

15

20

25

30

35

40

45

50

55

jun

2010

jul

2010

aug

2010

sep

2010

okt

2010

nov

2010

dec

2010

jan

2011

feb

2011

mar

2011

apr

2011

maj

2011

jun

2011

jul

2011

aug

2011

sep

2011

okt

2011

Privat DDH : 1004 Killavaat Aliannguat, Minesite

1004 [ 2] [V-Hast] [RAW] [Øje] [MI]

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 29/32

ANNEX 4 MEASURED RELATIVE HUMIDITY AT KILLAVAAT ALIANNGUAT

LF

UG

T [%

]

20

30

40

50

60

70

80

90

100

jun

2010

jul

2010

aug

2010

sep

2010

okt

2010

nov

2010

dec

2010

jan

2011

feb

2011

mar

2011

apr

2011

maj

2011

jun

2011

jul

2011

aug

2011

sep

2011

okt

2011

Privat DDH : 1004 Killavaat Aliannguat, Minesite

1004 [ 1] [LFUGT] [RAW] [Øje] [MI]

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 30/32

ANNEX 5 MEASURED PRECIPITATION AT KILLAVAAT ALIANNGUAT

ACCUMULATED DAILY TOTAL

NB

[m

m]

0

5

10

15

20

25

30

35

40

45

50

jun

2010

jul

2010

aug

2010

sep

2010

okt

2010

nov

2010

dec

2010

jan

2011

feb

2011

mar

2011

apr

2011

maj

2011

jun

2011

jul

2011

aug

2011

sep

2011

okt

2011

Privat DDH : 1004 Killavaat Aliannguat, Minesite

1004 [ 1] [NB] [DYN] [Sum] [DD]

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 31/32

ANNEX 6 MEASURED WIND DIRECTION DATA AT KILLAVAAT ALIANNGUAT

HOURLY AVERAGE VALUES

NORTH

SOUTH

WEST EAST

4%

8%

12%

16%

20%

WIND SPEED

(m/s)

>= 30.0

25.0 - 30.0

20.0 - 25.0

15.0 - 20.0

10.0 - 15.0

5.0 - 10.0

2.0 - 5.0

0.5 - 2.0

Calms: 9.68%

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Climate and Hydrology - Environmental Impact Assessment for TANBREEZ Project 32/32

ANNEX 7 MEASURED WIND CLASS FREQUENCY AT KILLAVAAT ALIANNGUAT

9.7

40.2

32.4

10.3

3.82.1

1.1 0.4 0.10

5

10

15

20

25

30

35

40

45

%

Wind Class Frequency Distribution

Wind Class (m/s)

Calms 0.5 - 2.0

2.0 - 5.0 5.0 - 10.0

10.0 - 15.015.0 - 20.0

20.0 - 25.025.0 - 30.0

>= 30.0