Water, Salinity and Irrigation in Australia s Murray-Darling Basin & Hetao Irrigation District
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1 Water, Salinity and Irrigation in Australia s Murray-Darling Basin & Hetao Irrigation District Ian White Australian National University
2 Ian White FTSE Research Major research area is water resources with emphasis on: sustainable and safe water use and management, surface-groundwater interactions and water quality, mitigation of and adaptation to climate change and land use impacts on water security and quality water policy & planning Very proud to be a colleague of Professor Yang Jinzhong from Wuhan University
3 Previous Work in China Miyun Watershed With MWR & MEP Dongjiang Watershed NDRC Visit 22 Feb 2012
4 Outline 1. Comparison of Challenges 2. Brief overview Australian climate 3. Characteristics of the Murray-Darling Basin 4. Salinity and irrigation problems in the Basin 5. Water reforms & the Basin Salinity Management Strategy 6. Some observations from Hetao Irrigation District
5 Comparison of Problems Faced in Water Issue China Australia Water scarcity Yes Yes Floods Yes Sometimes Droughts Yes Yes Point source pollution Yes No Diffuse Source Pollution Nutrients, Sediment, Salinity Salinity, nutrients, sediments Priorities People, Crops, Industry, Environment People, Environment, Crops, Industry
6 Comparison of Climates Peel, M. C.; B. L. Finlayson; T. A. McMahon (2007). Updated world map of the Köppen-Geiger climate classification". Hydrology and Earth System Sciences. 11: doi: /hess Differences between cold and warm arid and semi-semi-arid regions
7 Distribution of Mean Annual Rainfall in Australia Most of Australia has less than 400mm/year 1/3 continent has zero runoff The driest inhabited continent
8 Rainfall Variability, the Critical Issue Var = 90 p 10 p 50 p Large Variability Frequent Severe Droughts For Hetao Irrigation District Index of Variability 0.89
9 Average Annual Pan Evaporation Range 1000<Epan<4000
10 Main Irrigation Area in Australia \
11 Murray-Darling Basin A transboundary basin River shared between 4 States (owners of water) & 1 Territory
12 Physical Characteristics of the Murray-Darling Basin Basin Area 1,059,000 km 2-14% of Australia's land area. Owned & managed by 4 States, 1 Territory, Qld, NSW, ACT, Vic, SA Has Australia's three longest rivers, Darling 2,740 km long Murray 2,530 km long Murrumbidgee 1,690 km long. 67% of the MDB is used for growing crops and pasture Irrigated Area = 19,000 km 2 (75% total Australian irrigation) = 1,900,000 ha = 0.285x10 8 mu
13 Irrigation Areas in the Basin 19,000 km 2 of irrigated area =3.3x area of Hetao Irrigation District
14 Annual Water Balance of the Basin Average Rainfall 501 mm Average Evapotranspiration 471 mm (94%) Average Groundwater Recharge 10 mm (2%) Average Runoff 22.5 mm (4%) Average Discharge 12.9 km 3 Specific Yield 12.2 mm Total Storage Capacity 22.2 km 3
15 Water Use in the Basin Developed Yield km 3 Diversion km 3 Water Use km 3 Water Use > Sus. Yield Sustainable Yield km 3 Cotton - 20% of water used for agriculture Dairy farming - 17% Pasture - 17% Rice - 16% 66% of Australia s agricultural water use
16 People in the Basin-2006 Census Population - 2,004,560-10% of Australia's population. 10% of people employed in Agriculture (3% Australia) 38% of Australia's farmers live in the MDB. 39% of people employed aged 65 years or over in the MDB were farmers 61,033 farms accounting for 39% of all farms in Australia
17 Food Production in the Basin Proportion of Australia's food production in : 100% of rice; 95% of oranges; 62% of pigs; 54% of apples; and 48% of wheat.
18 Murray Darling Basin Concerns By 1980 s increase in diversions/irrigation a problem for: water quality- salinity downstream water supply the riverine environment rising water tables Some rivers were over allocated by 600% (the perils of ignoring the water balance equation)
19 Impacts of Regulation and Irrigation Reduced flooding of wetlands Decrease in wetlands and wetland health Algal blooms Sedimentation in dams Rising water tables Salinisation Tail water pollution (pesticides/ fertilizers)
20 Water Reforms in Australia over last 2 decades Cap on surface water abstraction from Murray-Darling 1995 Australian Bureau of Statics Water Accounts 1996 National Land & Water Audit 1999 & Salinity Audit 1999 Basin Salinity Management Strategy , MDB Council Integrated Catchment Management Policy-2001 National Water Initiative Commonwealth Water Act 2007 (Amended 2008) Murray-Darling Basin Management Strategy 2015
21 1995 Cap on Surface Water Abstraction in MDB data/page/86/cap_brochure.pdf Restricted SW abstraction to 1993/4 levels but neglected groundwater
22 Salinity in the Murray-Darling Basin Three sources of increased salinity discharge: 1. Natural groundwater discharge 2. Irrigation drainage and increased saline groundwater discharge due to rising water tables 3. Dryland salinity (minor)
23 Geology of Murray Darling Basin
24 data/page/303/final_salt_audit2.pdf Groundwater Zones of the Murray Darling Basin Murray Basin
25 Irrigation Areas in the Basin Major irrigation areas in regions with saline groundwater
26 data/page/303/final_salt_audit2.pdf Depth to Water Table in Irrigation Areas Irrigation, a key contributor to rising water tables & salinity discharge
27 Transect of River Murray Salinity as Electrical Conductivity (EC) Salinity EC =μs/cm TDS (mg/l) 0.64xEC
28 The Indicator Site for Salinity in the Murray- Darling Basin Morgan South Australia Basin managed to keep salinity EC < 800 µ S/cm TDS < 0.5 gm/l
29 EC25 (ms/cm) River Murray Salinity vs Flow Salinity Target Flow Limit Annual Flow (km 3 /y) Impact of River Flow on Salinity: River Murray in South Australia
30 The Basin Salinity Management Strategy Introduced in 2001 by the Murray-Darling Ministerial Council (MDBC, 2001a). The Strategy is intended to guide communities and Governments in working together to control salinity and protect key natural resource values within their catchments, consistent with the principles of the Integrated Catchment Management.
31 The Basin Salinity Management Strategy The objectives of the Strategy are to: Maintain river salinity in South Australia, < 800 EC for 95 per cent of the time; Maintain the water quality of the shared water resources of the Murray and Darling Rivers for all uses. Control the rise in salt loads in all tributary rivers of the Murray-Darling Basin, Control land degradation and protect important terrestrial ecosystems, Maximise net benefits from salinity control across the Basin.
32 Main Thrust of Water Reforms 1. Increase the share of water for the environment 2. Decrease groundwater recharge beneath irrigation areas 3. Move irrigation water from low value to high value crops 4. Improve irrigation efficiency A$15B 5. Control the discharge of saline groundwater A$15B Uses water entitlements and economic incentives to achieve 1 to 4
33 Features of the Basin Salinity Management Strategy Audited independently every year Reviewed 2007, 2015 Cost benefit analysis performed on activities Paid for by Commonwealth Legacy of History Aus $15 billion Paid for by State Governments Development Offsets Paid for by catchment management agencies (State & federally funded programs
34 Control Saline Groundwater Discharges in Irrigation Areas Saline Groundwater pumped to saline evaporation basins Pumping lowers water table in irrigation areas
35 Saline Groundwater Disposal Basins Wakool Tullakool NSW
36 Disposal of Intercepted Salinity in Salt Lakes WRR (1995) 31, Proposed Salt Lake Disposal Engineered Disposal Basin Will there be environmental consequences?
37 Nulla Spring Lake Natural Groundwater Discharge Zone Salinity 10xSeawater Stratigraphically complex WRR (1995) 31,
38 Salt Lake Model Brine Pool 10xSW Do Groundwater Discharges Confine Brine Pools? WRR (1997) 33,
39 Groundwater Composition versus Modelled Evaporation Re-solution Yamba Clay Yamba Clay Parilla Sand Re- solution WRR (1995) 31,
40 Hele-Shaw & Numerical Models of Plume Development WRR (1997) 33, WRR (1997) 33,
41 Conclusions from GW Geochemistry, H-S & Numerical Models of Evolution of Salt Plumes beneath Salt Lakes Salt lakes capped with significant thicknesses of clay - suitable for use as disposal basins - evaporating boundary layer is stabilised by the groundwater evaporative discharge WRR (1995) 31, ; WRR (1997) 33, , WRR (1997); 33,
42 Some Observations from Hetao Irrigation District
43 Irrigation Inputs & Outputs Hetao Irrigation District Input from Yellow River Water Supply Bureau, Dengkou Output to Yellow River
44 Other Inputs Salinity of Shallow Aquitard (Top Layer) Seepage from: Yellow River Mountains Infiltration from precipitation
45 Where does the water and salt imported into Hetao Irrigation District go?
46 Input/Output Flow Data Water Input from & output into Yellow River (10 8 m 3 ) Very small drainage outflow until 1977 Input from Yellow River Outflow on average about 1/10 of irrigation inflow Year Output into Yellow River Leakage of drainage to groundwater?
47 (mm/y) Estimation of Annual Specific Irrigation Losses Hetao Irrigation District Annual Irrigation Water Losses Mean specific irrigation water losses = 749 ± 77 mm/y y = x R² = Year Increasing trend caused by small drainage outflow before 1977 This is the minimum water lost from Hetao Basin since does not include YR seepage & rainfall
48 Annual Precipitation (mm/y) How Does Precipitation Affect Irrigation Losses? Mean Annual Precipitation Hetao Basin, y = x R² = Year Have estimated additional P data from 1990 to 2000, better data Appears to be a single station? Mean Annual P from 1990 to 2013, = 156 ± 52 mm/y (CV =0.332) Need spatially interpolated rainfall data
49 (mm/y) How Does Precipitation Affect Irrigation Losses? Hetao I D Annual Water Losses vs Annual Precip Estimated from P data from 1990 to 2006 Is a non-linear response, as expected Annual Precipitation (mm) Clearly depends on monthly distribution of rainfall Low rainfalls minimum impact on irrigation water losses. Higher rainfalls decrease irrigated water losses due to decreased supply from lower demand and increased drainage!
50 The irrigation input water carries salt with it. What happens to the input salt in Yellow River water (0.5 g/l)?
51 (kg/mu/y) Is Salt from Irrigation being Stored or Exported from Basin? 300 Hetao I D Annual Salt Stored from Irrigation in Basin Assume a closed Basin Drainage 2 gm/l Estimated salt storage based on estimated drainage salinity 2 g/l Mean annual storage = 174 kg/mu/y Year
52 Cumulative Salt Store (10 4 tonne) Total Increased Salt Storage in HID due to Irrigation since Hetao I D Cumualtive Salt Stored in Basin Drainage 2 gm/l y = 144x Between 1967 & 2006 about 0.6x10 8 tonnes of salt added to the Basin by irrigation water from Yellow River. Increasing at a rate of about 144x10 4 tonnes/year Year
53 Where does irrigation-added salinity go? Evaporation causes denser salt water to accumulate at groundwater surface above fresher groundwater This can be convectively unstable and saline groundwater could fall to the bottom aquifer if connected
54 Where does irrigation added salinity go? We have studied this groundwater convection problem experimentally and numerically in evaporating salt lakes in Australia Wooding, R.A.,.Tyler, S.W. and I.White I. (1997). Convection in Groundwater below an evaporating salt lake: 1. Onset of instability. Water Resour. Res.,33, Convection occurs when K crit > 0.01 m/d Wooding, R.A., S.W.Tyler, I.White and P.A. Anderson (1997). Convection in Groundwater below an evaporating salt lake: 2. Evolution of fingers or plumes. Water Resour. Res., 33,
55 Where does irrigation added salinity go? Salinity of Shallow Aquitard (Top Layer)
56 Where does irrigation added salinity go? Salinity of First Aquifer
57 Where does irrigation added salinity go? Salinity of Second Aquifer Predicts accumulation of salt in second aquifer if aquifers leaky and closed Basin
58 Is the Basin closed??? Salinity of Second Aquifer Possibility of density-driven flow under and down Yellow River?
59 Bredehoeft (1997) Hierarchy of Factors Contributing to Decisions about Water LAW POLITICAL ECONOMIC TECHNICAL Reflections on Hydrology: Science and Practice. N. Burras (ed.) AGU 1997, pp IAH London 20 Oct 2011
60 Concluding Comments Australia and China share concerns in water, irrigation & salinity In the Murray-Darling Basin Australia has experimented with a range of reform options to control water use and salinity A critical issue is the availability of good quality spatial & temporal data The disposal of saline drainage waters in MDB is an on-going issue A very rough analysis of Hetao Irrigation District suggests storage of salt there may be a problem The analysis in the MDB of salinity-driven groundwater convection appears directly applicable to Hetao The rough analysis gives a number of predictions which can be tested It also suggests solutions to apparent build up of salt
61 謝謝
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