Threshold values and management options for nutrients in a catchment of a temperate estuary with poor ecological status

Hinsby, Klaus; Markager, Stiig; Kronvang, Brian; Windolf, Jørgen; Sonnenborg, Torben O.; Thorling, Lærke

doi:10.5194/hess-16-2663-2012

Cited by 31 publications

(16 citation statements)

References 64 publications

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“…van Roosmalen, 2007van Roosmalen, , 2009). Increasing or decreasing precipitation and the resulting increase or decrease in groundwater recharge or discharge may also deteriorate dependent or associated ecosystems and agricultural production (Aldous et al, 2011;Barron et al, 2012;Hinsby et al, 2012;Jeppesen et al, 2009;Olesen et al, 2007;Sonnenborg et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Potential climate change impacts on the water balance of regional unconfined aquifer systems in south-western Australia

Ali

McFarlane

Varma

et al. 2012

Hydrol. Earth Syst. Sci.

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Abstract. This study assesses climate change impacts on water balance components of the regional unconfined aquifer systems in south-western Australia, an area that has experienced a marked decline in rainfall since the mid 1970s and is expected to experience further decline due to global warming. Compared with the historical period of 1975 to 2007, reductions in the mean annual rainfall of between 15 and 18 percent are expected under a dry variant of the 2030 climate which will reduce recharge rates by between 33 and 49 percent relative to that under the historical period climate. Relative to the historical climate, reductions of up to 50 percent in groundwater discharge to the ocean and drainage systems are also expected. Sea-water intrusion is likely in the PeelHarvey Area under the dry future climate and net leakage to confined systems is projected to decrease by up to 35 percent which will cause reduction in pressures in confined systems under current abstraction. The percentage of net annual recharge consumed by groundwater storage, and ocean and drainage discharges is expected to decrease and percentage of net annual recharge consumed by pumping and net leakage to confined systems to increase under median and dry future climates. Climate change is likely to significantly impact various water balance components of the regional unconfined aquifer systems of south-western Australia. We assess the quantitative climate change impact on the different components (the amounts) using the most widely used GCMs in combination with dynamically linked recharge and physically distributed groundwater models.

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Section: Introductionmentioning

confidence: 99%

Potential climate change impacts on the water balance of regional unconfined aquifer systems in south-western Australia

Ali

McFarlane

Varma

et al. 2012

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

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“…ROC analysis is commonly used to understand the performance of a binary classifier [ 36 ], in this case, sub-basins with eutrophic conditions based on P-PO 4 concentrations. A single concentration limit for eutrophication is difficult to determine and will depend on the local geological, climate and groundwater conditions [ 37 ]. Nevertheless, we used a P-PO 4 concentration of 0.1 mg L -1 for rivers and streams to discriminate sub-basins with eutrophic conditions [ 38 , 39 ].…”

Section: Methodsmentioning

confidence: 99%

Micro and Macroscale Drivers of Nutrient Concentrations in Urban Streams in South, Central and North America

et al. 2016

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Global metrics of land cover and land use provide a fundamental basis to examine the spatial variability of human-induced impacts on freshwater ecosystems. However, microscale processes and site specific conditions related to bank vegetation, pollution sources, adjacent land use and water uses can have important influences on ecosystem conditions, in particular in smaller tributary rivers. Compared to larger order rivers, these low-order streams and rivers are more numerous, yet often under-monitored. The present study explored the relationship of nutrient concentrations in 150 streams in 57 hydrological basins in South, Central and North America (Buenos Aires, Curitiba, São Paulo, Rio de Janeiro, Mexico City and Vancouver) with macroscale information available from global datasets and microscale data acquired by trained citizen scientists. Average sub-basin phosphate (P-PO4) concentrations were found to be well correlated with sub-basin attributes on both macro and microscales, while the relationships between sub-basin attributes and nitrate (N-NO3) concentrations were limited. A phosphate threshold for eutrophic conditions (>0.1 mg L-1 P-PO4) was exceeded in basins where microscale point source discharge points (eg. residential, industrial, urban/road) were identified in more than 86% of stream reaches monitored by citizen scientists. The presence of bankside vegetation covaried (rho = –0.53) with lower phosphate concentrations in the ecosystems studied. Macroscale information on nutrient loading allowed for a strong separation between basins with and without eutrophic conditions. Most importantly, the combination of macroscale and microscale information acquired increased our ability to explain sub-basin variability of P-PO4 concentrations. The identification of microscale point sources and bank vegetation conditions by citizen scientists provided important information that local authorities could use to improve their management of lower order river ecosystems.

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“…The groundwater and drinking water standards are set to a maximum of 50 mg l −1 nitrate in the European Union (EU) following the recommendations of WHO 10 , which is almost equal to the US Environmental Protection Agency’s maximum contaminant level of 10 mg l −1 N 11 . Nitrate thresholds values in groundwater in regard to surface water pollution might be well below the drinking water nitrate standard dependent on the specific sensitivity of the ecosystems 12 . The drinking water standard is based on clinical epidemiological evidence and aims to protect infants from the acute condition called methemoglobinemia 10 .…”

Section: Introductionmentioning

confidence: 99%

Groundwater nitrate response to sustainable nitrogen management

Hansen

Thorling

Termansen

et al. 2017

Sci Rep

183

100

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Throughout the world, nitrogen (N) losses from intensive agricultural production may end up as undesirably high concentrations of nitrate in groundwater with a long-term impact on groundwater quality. This has human and environmental health consequences, due to the use of groundwater as a drinking water resource, and causes eutrophication of groundwater-dependent ecosystems such as wetlands, rivers and near-coastal areas. At national scale, the measured nitrate concentrations and trends in Danish oxic groundwater in the last 70 years correlate well with the annual agricultural N surpluses. We also show that the N use efficiency of agriculture is related to the groundwater nitrate concentrations. We demonstrate an inverted U-shape of annual nitrate concentrations as a function of economic growth from 1948 to 2014. Our analyses evidence a clear trend of a reversal at the beginning of the 1980s towards a more sustainable agricultural N management. This appears to be primarily driven by societal demand for groundwater protection linked to economic prosperity and an increased environmental awareness. However, the environmental and human health thresholds are still exceeded in many locations. Groundwater protection is of fundamental global importance, and this calls for further development of environmentally and economically sustainable N management in agriculture worldwide.

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Threshold values and management options for nutrients in a catchment of a temperate estuary with poor ecological status

Cited by 31 publications

References 64 publications

Potential climate change impacts on the water balance of regional unconfined aquifer systems in south-western Australia

Potential climate change impacts on the water balance of regional unconfined aquifer systems in south-western Australia

Micro and Macroscale Drivers of Nutrient Concentrations in Urban Streams in South, Central and North America

Groundwater nitrate response to sustainable nitrogen management

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