The benefits of a multidisciplinary team model for groundwater-surface water investigations, Thirlmere Lakes, NSW.

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dc.contributor.authorCowley, KLen_AU
dc.contributor.authorCohen, TJen_AU
dc.contributor.authorForbes, MSen_AU
dc.contributor.authorBarber, Een_AU
dc.contributor.authorAllenby, Jen_AU
dc.contributor.authorAndersen, MSen_AU
dc.contributor.authorAnibas, Cen_AU
dc.contributor.authorGlamore, Wen_AU
dc.contributor.authorChen, SYen_AU
dc.contributor.authorJohnson, Fen_AU
dc.contributor.authorTimms, Wen_AU
dc.contributor.authorDavid, Ken_AU
dc.contributor.authorMcMillan, Ten_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorPeterson, MAen_AU
dc.contributor.authorHughes, CEen_AU
dc.contributor.authorKrogh, Men_AU
dc.date.accessioned2021-08-30T07:18:40Zen_AU
dc.date.available2021-08-30T07:18:40Zen_AU
dc.date.issued2019-11-25en_AU
dc.date.statistics2021-08-16en_AU
dc.description.abstractThe Thirlmere Lakes Research Program (TLRP) is a four-year collaborative multidisciplinary program designed to gain a whole-of-system understanding of the hydro-dynamics of a complex lake environment. The program was established from concerns that proximal aquifer interference activities were factors in recent lake level declines. Five research teams were established to investigate five adjacent lakes set within an entrenched meander bend located south-west of Sydney. The project involved lithological, geochemical and geochronological analysis from lake beds and surrounding slopes to understand lake evolution and determine potential past lake-drying events. Further geological understanding of the lake area was obtained from resistivity imaging (RI), ground penetrating radar (GPR), and analysis of rock cores that were drilled from two deep bores adjacent the lakes. Development of water balance budgets involved fine-scale on-site meteorological measurements including on-site evapotranspiration monitoring, combined with high-resolution bathymetry from RTK GPS, LiDAR surveying and drone photogrammetry. Groundwater-surface water interactions were measured using lake-bed multilevel temperature and pressure arrays, hydraulic head measurements and fine-scale isotope, major ion and environmental tracer time-series analysis. Preliminary findings indicate that the five lakes have been separated for over ~100,000 years and that the lakes themselves contain sediment that is possibly up to 250,000 years old. Assessing the modern dynamics we show that current lake level declines during a period of low rainfall are largely evaporation dominated. One lake however appears to have greater water storage in adjacent sediments providing compensatory inflows. In a second lake, there are indications of localised connectivity with shallow (≤18m) groundwater, but no evidence of connectivity with deeper aquifers. Geological surveys indicate a clay layer 6-8 m below the lakes and spatial variations in both sediment and rock geology. The influence of these geological features, including structures projecting towards the lakes, on groundwater storage and flow is the focus of ongoing research as is temporal variability and lake interactions at different lake levels. The benefits of the multidisciplinary team model include refining the research targeting areas of uncertainty and to enhance and calibrate each team’s results. This approach will provide a comprehensive whole-of-system model of the evolution and hydro-dynamics of a complex lake system. © The Authorsen_AU
dc.identifier.citationCowley, K., Cohen, T., Forbes, M., Barber, E., Allenby, J., Andersen, M. S., Anibas, C., Glamore, W., Chen, S., Johnson, F., Timms, W., David, K., McMillan, T., S., Cendon, D., , Peterson, M. A., Hughes, C. E., & Krogh, M. (2019). The benefits of a multidisciplinary team model for groundwater-surface water investigations, Thirlmere Lakes, NSW. Paper presented to the Australasian Groundwater Conference, "Groundwater in a Changing World", 24 - 27 November 2019, Brisbane Convention and Exhibition Centre, Queensland. Retrieved from: http://www.groundwater.com.au/documents/agc2019-book-of-abstracts-updated.pdfen_AU
dc.identifier.conferenceenddate27 November 2019en_AU
dc.identifier.conferencenameAustralasian Groundwater Conference, 'Groundwater in a Changing World'en_AU
dc.identifier.conferenceplaceBrisbane, Queenslanden_AU
dc.identifier.conferencestartdate24 November 2019en_AU
dc.identifier.isbn978-1-925562-35-4en_AU
dc.identifier.urihttp://www.groundwater.com.au/documents/agc2019-book-of-abstracts-updated.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11557en_AU
dc.language.isoenen_AU
dc.publisherNational Centre for Groundwater Research And Training, & Australian Chapter International Association Of Hydrogeologistsen_AU
dc.subjectLakesen_AU
dc.subjectNew South Walesen_AU
dc.subjectAustraliaen_AU
dc.subjectAquifersen_AU
dc.subjectGeochemical surveysen_AU
dc.subjectRadaren_AU
dc.subjectEvaporationen_AU
dc.subjectGeologic surveysen_AU
dc.subjectGround wateren_AU
dc.subjectTracer techniquesen_AU
dc.titleThe benefits of a multidisciplinary team model for groundwater-surface water investigations, Thirlmere Lakes, NSW.en_AU
dc.typeConference Abstracten_AU
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