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Ground truthing groundwater-recharge estimates derived from remotely sensed evapotranspiration: a case in South Australia
- 作者:Russell S. Crosbie ; Phil Davies ; Nikki Harrington…
- 关键词:Australia ; Groundwater recharge/water budget ; Water balance ; Water ; table fluctuation ; Chloride mass balance
- 刊名:Hydrogeology Journal
- 出版年:2015
- 出版时间:March 2015
- 年:2015
- 卷:23
- 期:2
- 页码:335-350
- 全文大小:12,206 KB
- 参考文献:1. ABARE-BRS (2010) Catchment scale land use mapping for Australia: update March 2010. Australian Bureau of Agricultural and Resource Economics, Bureau of Rural Sciences, Canberra, Australia
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- 刊物主题:Earth sciences
Hydrogeology Geology Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
- 出版者:Springer Berlin / Heidelberg
- ISSN:1435-0157
文摘
Using a water balance to estimate groundwater recharge through the use of remotely sensed evapotranspiration offers a spatial and temporal density of data that other techniques cannot match. However, the estimates are uncertain and therefore ground truthing of the recharge estimates is necessary. This study, conducted in the south-east of South Australia, demonstrated that the raw water-balance estimates of recharge had a negative bias of 45?mm/yr when compared to 190 recharge estimates using the water-table fluctuation method over a 10-year period (2001-010). As this bias was not related to the magnitude of the recharge estimated using the water-table fluctuation method, a simple offset was used to bias-correct the water-balance recharge estimates. The bias-corrected recharge estimates had a mean residual that was not significantly different from an independent set of 99 historical recharge estimates but did have a large mean absolute residual indicating a lack of precision. The value in this technique is the density of the data (250-m grid over 29,000?km2). The relationship between the water-table depth and net recharge under different vegetation types was investigated. Under pastures, there was no relationship with water-table depth, as the shallow roots do not intercept groundwater. However, under plantation forestry, there was a relationship between net recharge and water-table depth. Net recharge under plantation forestry growing on sandy soils was independent of the water table at around 6?m depth but, under heavier textured soils, the trees were using groundwater from depths of more than 20?m.
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