The consequences of land use change on nutrient exports: a regional scale assessment in south-west Victoria, Australia

Ierodiaconou, Daniel; Laurenson, L.; Leblanc, Marc; Stagnitti, Frank; Duff, Gordon A.; Salzman, Scott; Versace, Vincent L.

doi:10.1016/j.jenvman.2004.09.010

Cited by 88 publications

(57 citation statements)

References 9 publications

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“…This is unlike the pre-classification approach that is limited to selected sub-areas where backscatter levels were extracted from. Therefore, the ensemble approach combined supervised and unsupervised classification algorithms (similarly to Ierodiaconou et al 2005) which allowed using one ground-truth dataset to train a classification that was subsequently applied to the whole time series. This is a big advantage since sampling of each time series is most often not realistic given survey time and cost restrictions.…”

Section: Change Detection Methodsmentioning

confidence: 99%

“…Since the supervised information is to be extended to the broader time series of acoustic data for which there is no ground-validation data, an analysis similar to that of Ierodiaconou et al (2005), in which supervised and unsupervised classifications are compared and evaluated for similarity, was applied. In this paper, K means was chosen as an unsupervised classification method due to its success in finding optimal clustering solutions and after comparing the RF classification to an array of unsupervised classifiers.…”

Section: Comparison Of Thematic Mapsmentioning

confidence: 99%

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Seafloor change detection using multibeam echosounder backscatter: case study on the Belgian part of the North Sea

et al. 2017

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Section: Change Detection Methodsmentioning

confidence: 99%

Section: Comparison Of Thematic Mapsmentioning

confidence: 99%

Seafloor change detection using multibeam echosounder backscatter: case study on the Belgian part of the North Sea

et al. 2017

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“…Afforestation of farmland was widespread in southeastern South Australia and southwestern Victoria (known as the Green Triangle) from the 1980s through to the 2000s, with the plantation area expanding by 5-14 % to 30 000 ha in Victoria alone (Adelana et al, 2014;Benyon et al, 2006;Ierodiaconou et al, 2005). However, the subsequent development of tree plantations in the region has been hindered by a poor timber market (HVP Plantations, personal communication, 2013) and concerns that plantations use more groundwater and surface water than other land uses like farming.…”

Section: Management Of Tree Plantations and Rechargementioning

confidence: 99%

A groundwater recharge perspective on locating tree plantations within low-rainfall catchments to limit water resource losses

Dean

Webb

Jacobsen

et al. 2015

Hydrol. Earth Syst. Sci.

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Abstract.Despite the many studies that consider the impacts of plantation forestry on groundwater recharge, and others that explore the spatial heterogeneity of recharge in low-rainfall regions, there is little marriage of the two subjects in forestry management guidelines and legislation. Here we carry out an in-depth analysis of the impact of reforestation on groundwater recharge in a low-rainfall (< 700 mm annually), high-evapotranspiration paired catchment characterized by ephemeral streams. Water table fluctuation (WTF) estimates of modern recharge indicate that little groundwater recharge occurs along the topographic highs of the catchments (average 18 mm yr −1 ); instead the steeper slopes in these areas direct runoff downslope to the lowland areas, where most recharge occurs (average 78 mm yr −1 ). Recharge estimates using the chloride mass balance (CMB) method were corrected by replacing the rainfall input Cl − value with that for streamflow, because most recharge occurs from infiltration of runoff through the streambed and adjacent low gradient slopes. The calculated CMB recharge values (average 10 mm yr −1 ) are lower than the WTF recharge values (average 47 mm yr −1 ), because they are representative of groundwater that was mostly recharged prior to European land clearance (> BP 200 years). The tree plantation has caused a progressive drawdown in groundwater levels due to tree water use; the decline is less in the upland areas.The results of this study show that spatial variations in recharge are important considerations for locating tree plantations. To conserve water resources for downstream users in low-rainfall, high-evapotranspiration regions, tree planting should be avoided in the dominant zone of recharge, i.e. the topographically low areas and along the drainage lines, and should be concentrated on the upper slopes, although this may negatively impact the economic viability of the plantation.

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“…Based on their migration behavior, NPS pollutants can largely be grouped into two classes, dissolved and adsorbed. The export coefficient model (ECM) is considered to be reliable for the estimation of dissolved NPS Water 2018, 10, 17 3 of 27 pollutants [30]. The earliest ECM was proposed by the United States and Canada [31,32] and was used to explore the response of lake eutrophication to land-use changes in the early 1970s.…”

Section: Introductionmentioning

confidence: 99%

Non-Point Source Nitrogen and Phosphorus Assessment and Management Plan with an Improved Method in Data-Poor Regions

Chen

Liu

Peng

et al. 2017

Water

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Abstract:To enhance the quantitative simulation and integrated assessment of non-point source (NPS) pollution in plateau lakes in data-poor regions, a simple and practical NPS assessment method is developed by combining the improved export coefficient model (ECM) and the revised universal soil loss equation (RUSLE). This method is evaluated via application to the Chenghai Lake watershed (Yunnan Province, China), which contains a typical plateau lake. The estimated results reflect the actual situation within the watershed. The total nitrogen (TN) and total phosphorus (TP) loads in the study area in 2014 were 360.35 t/a (44.30% dissolved nitrogen (DN) and 55.70% adsorbed nitrogen (AN)) and 86.15 t/a (71.40% adsorbed phosphorus (AP)), respectively. The southern and eastern portions of the watershed are key regions for controlling dissolved and adsorbed pollutants, respectively. Soil erosion and livestock are the main TN and TP pollution sources in the study area and should be controlled first. Additionally, reasonable and practical suggestions are proposed to minimize water pollution according to a scenario analysis. The method in this study provides a foundation for scientific theories that can be used in water resources protection planning and the method can be applied to the NPS assessment of similar regions with scarce data.

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The consequences of land use change on nutrient exports: a regional scale assessment in south-west Victoria, Australia

Cited by 88 publications

References 9 publications

Seafloor change detection using multibeam echosounder backscatter: case study on the Belgian part of the North Sea

Seafloor change detection using multibeam echosounder backscatter: case study on the Belgian part of the North Sea

A groundwater recharge perspective on locating tree plantations within low-rainfall catchments to limit water resource losses

Non-Point Source Nitrogen and Phosphorus Assessment and Management Plan with an Improved Method in Data-Poor Regions

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