0
SCHOOL OF EARTH AND ENVIRONMENT

Nathan Senevirathne

Supervisor

Associate Professor Ryan Vogwill

Oct

2013
Regional setting of project area

BMNDRC

Study area

The study area is part of Buntine-Marchagee Natural Diversity Recove...
Regional setting of project area
Study area sub-catchment
(~ 600 ha = 0.02 % of BMNDRC)

W023
W024

W023

W024

The Univer...
Remnant vegetation and landuse
~90%

Wheat Plantation

Lupin Plantation

~4%

Canola Plantation

Re-vegetated in 2013

Sal...
Geology & Topography
•
•
•
•
•

Drilling program carried out in mid 2012
LiDAR data
Geological survey of Western Australia...
Geology & Topography

Soil types, dykes and isolated outcrops of granite in the study area
(Baxter & Lipple 1985)
The Univ...
Geology & Topography

The gradient of slope in the study area
The University of Western Australia
Geology & Topography

A

B

C

B

A
C

D
D

Digital elevation profiles of study
area using LiDAR elevation data
The Univer...
Groundwater monitoring network

The University of Western Australia
Methodology Surface water catchment delineation
surface flow that could be generated by
a heavy rainfall

W023

W024

The ...
Methodology Surface water catchment delineation

New Boundary

618 ha
589 ha

The University of Western Australia
Methodology Hydrogeochemistry
 Water samples were collected from monitoring bores and several wetlands on 30th
April 2013...
Methodology Hydrogeochemistry

Dominance of Cl-, Na+, SO42-, Mg2+ and HCO3- in water samples
Molar Cl/Br ratios vs. Cl- co...
Methodology Hydrogeochemistry

Distribution of Total Dissolved Solids (TDS) in study area

The University of Western Austr...
Methodology Conceptual model of wetland-scaled water balance
Open water body ET
Rainfall
Surface water in-flow
Superficial...
Methodology Conceptualising groundwater flow

B

A’

B’
A

Transects of hydrogeological profiles marked on study area sub-...
Methodology Conceptualising groundwater flow

The University of Western Australia
Methodology Conceptualising groundwater flow

The University of Western Australia
Methodology Conceptualising groundwater flow

Groundwater equipotential lines and flow in shallow aquifer
The University o...
Methodology Conceptualising groundwater flow

Groundwater equipotential lines and flow in the saprolitic aquifer
The Unive...
Methodology Evapotranspiration
Open water body Evapotranspiration

0.7
(Marimuthua, Reynoldsa & Salle 2005; Allison 1974;
...
Methodology Evapotranspiration
Estimating bare soil evapotranspiration - Chen (1992)
Monthly bare soil ET with E1 (0.024 o...
Methodology Surface water run-off

(Groen and Savenije 2006)

•

Assumed that surface run-off within the immediate vicinit...
Methodology Surface water run-off

Possible flow patterns of surface water in-flow (generated using ArcGIS 10.1)
The Unive...
Methodology Surface water run-off
Elevation profiles across W023 and W024
A

A

B

D

H
W023

D

C

C

F

E

W024
G
G

B
H...
Methodology Surface water run-off
Estimation of surface area of water body

W etland

Highes t
s urafce Area
(m 2 )

Highe...
Results

Water and Chloride balance of W023

Volume
(m 3 /y ear)

Cl concentration
(mg/L)

Cl - Mas s
(kg/y ear)

2188.7
1...
Results

Water and Chloride balance of W024

Volume
(m 3 /y ear)
INPUT
Precipitation (P)
Horiz ontal groundwater inflow (G...
Results

Discussion

Water quality
W 023
3.8 to 7.43

W 024
0.18 to 7.92

pH

7.49 to 9.08

6.95 to 8.65

Redox potential ...
The University of Western Australia
The University of Western Australia
Results

Discussion

Water balance components of W0234
Volume
(m 3 /y ear)
44%
15%
41%

INPUT
Precipitation (P)
Horiz onta...
Results

Conclusion

W023 & W024
•
•
•
•
•

Flow-through wetlands
Direct contact with the water table of the surficial aqu...
Results

Conclusion

W023
concept is supported by the occurrence of
mature perennial vegetation in the northern
half of we...
Results

Conclusion

W024
concept is supported by the occurrence of
mature perennial vegetation in the northwestern part o...
Results

Conclusion

Iso- annual average total dissolved solids (TDS mg/L) curves along AA’

The University of Western Aus...
Questions

The University of Western Australia
Upcoming SlideShare
Loading in...5
×

Hydrogeological assessment of two important wetlands (GDEs) in Hodgson's Wetland suite

1,515

Published on

Hydrogeological assessment of two important wetlands (GDEs) in Hodgson's Wetland suite

Published in: Technology, Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
1,515
On Slideshare
0
From Embeds
0
Number of Embeds
15
Actions
Shares
0
Downloads
4
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Transcript of "Hydrogeological assessment of two important wetlands (GDEs) in Hodgson's Wetland suite"

  1. 1. SCHOOL OF EARTH AND ENVIRONMENT Nathan Senevirathne Supervisor Associate Professor Ryan Vogwill Oct 2013
  2. 2. Regional setting of project area BMNDRC Study area The study area is part of Buntine-Marchagee Natural Diversity Recovery Catchment (BMNDRC) The University of Western Australia
  3. 3. Regional setting of project area Study area sub-catchment (~ 600 ha = 0.02 % of BMNDRC) W023 W024 W023 W024 The University of Western Australia
  4. 4. Remnant vegetation and landuse ~90% Wheat Plantation Lupin Plantation ~4% Canola Plantation Re-vegetated in 2013 Salt – tolerant shrubs Eucalyptus overstory The University of Western Australia
  5. 5. Geology & Topography • • • • • Drilling program carried out in mid 2012 LiDAR data Geological survey of Western Australia by Baxter & Lipple 1985 The geology, physiography and soils of wheatbelt valleys by Commander et al. 2001 Regolith geology of the Yilgarn Craton, Western Australia: implications for exploration by Anand & Paine 2002  The entire study area is a low relief region that lies over Archaean granitic rock of the Yilgarn Craton; ~340 mAHD on WEST and ~290 mAHD on EAST  The typical soil structure is comprised of fresh granitic bedrock grading upwards into saprock and saprolite which are overlain by lacustrine clays, palaeochannel silts, yellow earthy sands (Balgerbine Soil System) (Anand & Paine 2002)  Basement rocks are exposed only at a small area near western margin and maximum depth is about 35 m  There is only one dyke appearing just outside of south-west margin (Geological Survey Western Australia by Baxter & Lipple 1985) The University of Western Australia
  6. 6. Geology & Topography Soil types, dykes and isolated outcrops of granite in the study area (Baxter & Lipple 1985) The University of Western Australia
  7. 7. Geology & Topography The gradient of slope in the study area The University of Western Australia
  8. 8. Geology & Topography A B C B A C D D Digital elevation profiles of study area using LiDAR elevation data The University of Western Australia
  9. 9. Groundwater monitoring network The University of Western Australia
  10. 10. Methodology Surface water catchment delineation surface flow that could be generated by a heavy rainfall W023 W024 The University of Western Australia
  11. 11. Methodology Surface water catchment delineation New Boundary 618 ha 589 ha The University of Western Australia
  12. 12. Methodology Hydrogeochemistry  Water samples were collected from monitoring bores and several wetlands on 30th April 2013. Electrical Conductivity (EC), Oxidation-Reduction Potential (ORP), pH, and temperature were measured at the field.  Ion chromatography using Dionex DX500 systems to determine the concentrations of major cations and anions Na-Cl type Na-Cl type waters waters The University of Western Australia
  13. 13. Methodology Hydrogeochemistry Dominance of Cl-, Na+, SO42-, Mg2+ and HCO3- in water samples Molar Cl/Br ratios vs. Cl- concentrations (mol/L) in water samples collected from groundwater and wetlands The University of Western Australia
  14. 14. Methodology Hydrogeochemistry Distribution of Total Dissolved Solids (TDS) in study area The University of Western Australia
  15. 15. Methodology Conceptual model of wetland-scaled water balance Open water body ET Rainfall Surface water in-flow Superficial in-flow Bare soil ET Surface water out-flow Superficial out-flow Saprolitic Aquifer Saprolitic Saprolitic discharge recharge Bedrock The University of Western Australia
  16. 16. Methodology Conceptualising groundwater flow B A’ B’ A Transects of hydrogeological profiles marked on study area sub-catchment The University of Western Australia
  17. 17. Methodology Conceptualising groundwater flow The University of Western Australia
  18. 18. Methodology Conceptualising groundwater flow The University of Western Australia
  19. 19. Methodology Conceptualising groundwater flow Groundwater equipotential lines and flow in shallow aquifer The University of Western Australia
  20. 20. Methodology Conceptualising groundwater flow Groundwater equipotential lines and flow in the saprolitic aquifer The University of Western Australia
  21. 21. Methodology Evapotranspiration Open water body Evapotranspiration 0.7 (Marimuthua, Reynoldsa & Salle 2005; Allison 1974; Tweeda, Leblanca & Cartwright 2009) (Tweeda, Leblanca & Cartwright 2009) Where The University of Western Australia
  22. 22. Methodology Evapotranspiration Estimating bare soil evapotranspiration - Chen (1992) Monthly bare soil ET with E1 (0.024 of Epan) and E2 (0.4 of Epan) Epan Jan Feb Mar Apr May 396.4 357.7 310.5 191.4 121.1 Jun 72.8 Jul 81.4 Aug 97.2 Sep Oct Nov Dec 131.2 209.0 281.2 379.4 Mean number of days of rain ≥1mm 2.0 1.8 2.2 1.5 5.0 6.2 7.5 6.4 5.1 2.6 2.0 1.7 E1 (mm/month) E2 (mm/month) 8.3 20.5 7.5 18.4 6.4 17.6 4.1 7.7 2.0 15.6 1.0 12.0 1.0 15.7 1.4 16.1 2.1 17.8 4.2 14.0 5.8 15.0 8.1 16.6 mid Feb – beginning June (4 months) The University of Western Australia
  23. 23. Methodology Surface water run-off (Groen and Savenije 2006) • Assumed that surface run-off within the immediate vicinity of W023 and W024 Jan Surface run-off from area of 1000 m 2 Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual 6.8 5.1 7.3 4.4 15.4 17.1 22.1 18.4 14.2 7.4 5.3 5.5 129.1 Jan Monthly Interception (Im) - mm Feb Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual 4.5 1.2 4.0 1.3 5.3 3.5 6.0 4.5 3.0 1.7 0.9 2.6 38.6 (m3 ) The University of Western Australia
  24. 24. Methodology Surface water run-off Possible flow patterns of surface water in-flow (generated using ArcGIS 10.1) The University of Western Australia
  25. 25. Methodology Surface water run-off Elevation profiles across W023 and W024 A A B D H W023 D C C F E W024 G G B H E F The University of Western Australia
  26. 26. Methodology Surface water run-off Estimation of surface area of water body W etland Highes t s urafce Area (m 2 ) Highes t water lev el (m) Annual minimum water lev el (m) Surface area at minimum depth (m 2 ) Av erage s urface area (m 2 ) W 023 W 024 7623.5 10584.0 1.35 0.64 0.70 0.00 1475.9 0.0 4549.7 5292.0 The University of Western Australia
  27. 27. Results Water and Chloride balance of W023 Volume (m 3 /y ear) Cl concentration (mg/L) Cl - Mas s (kg/y ear) 2188.7 1980.0 8.0 1036.0 17.5 2051.3 Section 3.1 and 3.12 Section 3.9 and 3.12 Vertical groundwater inflow (GW in ) 1048.9 1036.0 1086.7 Section 3.9 and 3.12 Surface water inflow (SW in ) 4061.1 8.0 32.5 INPUT Precipitation (P) Horiz ontal groundwater inflow (GW in ) 9278.7 OUTPUT Horiz ontal groundwater outflow (GW out ) Open water body ev apotrans piration (ET) Comments Section 3.11 and 3.12 3188.0 1825.0 9370.2 Total input 2628.0 Section 3.9 and 3.12 Section 3.10.1 and 3.12 2628.0 1440.0 7930.2 Percentage of error Total output 3 -91.5 m /y ear -12.0 mm/y ear 560.0 kg/y ear Balance Water and Chloride balance of W023 for a period of 12 months (from Sep 2012 to Sep 2013) The University of Western Australia
  28. 28. Results Water and Chloride balance of W024 Volume (m 3 /y ear) INPUT Precipitation (P) Horiz ontal groundwater inflow (GW in ) Surface water inflow (SW in ) Cl concentration (mg/L) Cl - Mas s (kg/y ear) 3116.2 1055.9 8.0 1097.0 24.9 1158.3 2923.4 8.0 23.4 7095.5 OUTPUT Horiz ontal groundwater outflow (GW out ) Open water body ev apotrans piration (ET) Bare s oil ev aporation (ET) Section 3.1 and 3.12 Section 3.9 and 3.12 Section 3.11 and 3.12 1206.7 1921.0 Total input 1517.1 Section 3.9 and 3.12 Section 3.10.1 and 3.12 1517.1 789.8 5062.9 981.2 6833.8 261.7 34.3 Comments Total output 3 m /y ear mm/y ear -310.5 kg/y ear Balance Water and Chloride balance of W024 for a period of 12 months (from Sep 2012 to Sep 2013) The University of Western Australia
  29. 29. Results Discussion Water quality W 023 3.8 to 7.43 W 024 0.18 to 7.92 pH 7.49 to 9.08 6.95 to 8.65 Redox potential (eh mV) EC (mS/cm) - 97.5 to 205 - 65 to 201 Cl- (mg/L) 1825 1921 TDS (mg/L) 3448 4826 Water balance components of W023 Volume (m 3 /y ear) 24% 21% INPUT Precipitation (P) Horiz ontal groundwater inflow (GW in ) Cl concentration (mg/L) Cl - Mas s (kg/y ear) 2188.7 1980.0 8.0 1036.0 17.5 2051.3 1% 64% 11% Vertical groundwater inflow (GW in ) 1048.9 1036.0 1086.7 34% 44% Surface water inflow (SW in ) 4061.1 8.0 32.5 1% 9278.7 15% 85% OUTPUT Horiz ontal groundwater outflow (GW out ) Open water body ev apotrans piration (ET) 3188.0 1440.0 7930.2 1825.0 9370.2 2628.0 2628.0 3 -91.5 m /y ear -12.0 mm/y ear 560.0 kg/y ear The University of Western Australia
  30. 30. The University of Western Australia
  31. 31. The University of Western Australia
  32. 32. Results Discussion Water balance components of W0234 Volume (m 3 /y ear) 44% 15% 41% INPUT Precipitation (P) Horiz ontal groundwater inflow (GW in ) Surface water inflow (SW in ) Cl concentration (mg/L) Cl - Mas s (kg/y ear) 3116.2 1055.9 8.0 1097.0 24.9 1158.3 2% 96% 2923.4 8.0 23.4 2% 7095.5 12% 74% 14% OUTPUT Horiz ontal groundwater outflow (GW out ) Open water body ev apotrans piration (ET) Bare s oil ev aporation (ET) 789.8 5062.9 981.2 6833.8 261.7 34.3 Uncertainty 1206.7 1921.0 1517.1 100% 1517.1 3 m /y ear mm/y ear -310.5 kg/y ear Component Error % Reference Lake-to-Pan coeff 30% (Tweeda, Leblanca & Cartwright 2009) Surface area (Surface water, ET) Winter (1981), TBRG - (Australian Bureau of Meteorology 2011) Precipitation 16% - 26% Winter (1981), TBRG - (Australian Bureau of Meteorology 2011) Groundwater (Hydraulic conductivity) 40% slug tests in Nabappie subcatchment – Variability in Average Groundwater (Capture zone – ± 0.5) 10% Statistically Cl- content in surface water Nabappie catchment 500 to 5000 mg/L Bourke (2011) The University of Western Australia
  33. 33. Results Conclusion W023 & W024 • • • • • Flow-through wetlands Direct contact with the water table of the surficial aquifer Can be assumed that both of the wetlands are underlain by a silcrete hardpan Hydrogeochemically different Majority of inputs being sourced from groundwater and surface water runoff components. • Considerable attention should be given to the surface water runoff component because it may carry a significant amount of solutes to wetland W023 (Winter 1981). The University of Western Australia
  34. 34. Results Conclusion W023 concept is supported by the occurrence of mature perennial vegetation in the northern half of wetland W023 The University of Western Australia
  35. 35. Results Conclusion W024 concept is supported by the occurrence of mature perennial vegetation in the northwestern part of wetland W024 The University of Western Australia
  36. 36. Results Conclusion Iso- annual average total dissolved solids (TDS mg/L) curves along AA’ The University of Western Australia
  37. 37. Questions The University of Western Australia
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×